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As compared to conventional diesel heavy-duty vehicles, natural gas vehicles have been proved to be more eco-friendly due to their lower production of greenhouse gas and pollutant emissions, which are causing enormous adverse effects on global warming and air pollution. However, natural gas vehicles were rarely studied before, especially through on-road measurements. In this study, a portable emission measurement system (PEMS) was employed to investigate the real-world emissions of nitrogen oxides (NOx) (nitrogen monoxide (NO), nitrogen dioxide (NO2)), total hydrocarbons (THC), carbon monoxide (CO), and carbon dioxide (CO2) from two liquified natural gas (LNG) China V heavy-duty cleaning sanitation trucks with different weight. Associated with the more aggressive driving behaviors, the vehicle with lower weight exhibited higher CO2 (3%) but lower NOx (48.3%) (NO2 (78.2%) and NO (29.4%)), CO (44.8%), and THC (3.7%) emission factors. Aggressive driving behaviors were also favorable to the production of THC, especially those in the medium-speed range but significantly negative to the production of CO and NO2, especially those in the low-speed range with high engine load. In particular, the emission rate ratio of NO2/NO decreased with the increase of speed/scaled tractive power in different speed ranges.
Jiguang Wang; Huaqiao Gui; Zhiwen Yang; Tongzhu Yu; Xiaowen Zhang; Jianguo Liu. Real-world gaseous emission characteristics of natural gas heavy-duty sanitation trucks. Journal of Environmental Sciences 2021, 115, 319 -329.
AMA StyleJiguang Wang, Huaqiao Gui, Zhiwen Yang, Tongzhu Yu, Xiaowen Zhang, Jianguo Liu. Real-world gaseous emission characteristics of natural gas heavy-duty sanitation trucks. Journal of Environmental Sciences. 2021; 115 ():319-329.
Chicago/Turabian StyleJiguang Wang; Huaqiao Gui; Zhiwen Yang; Tongzhu Yu; Xiaowen Zhang; Jianguo Liu. 2021. "Real-world gaseous emission characteristics of natural gas heavy-duty sanitation trucks." Journal of Environmental Sciences 115, no. : 319-329.
The supersaturated condensation of atmospheric aerosol is important in the study of mechanisms of cloud condensation and even heavy air pollution. The existing technology cannot realize accurate dynamic control of wide range supersaturation, so it is difficult to study condensation growth characteristics of nanoparticles through different levels of supersaturation. Here, a supersaturated condensation growth measurement system with three-stage microscope pipes was developed. The resolution of supersaturated condensation system is 0.14, within the range of 0.92 to 2.33 after calibration. Stabilization time is only about 80 s for saturation range 0.92–1.01, which helps to control saturation rapidly, and the control deviation of saturation is no more than 0.06. Measurement of different supersaturated condensation growth control conditions showed that, the particle size increased significantly compared with hygroscopic growth at high humidity. For single-component particles, the increase in size increased to a similar size at the same saturation, with a difference within 7.4%. The increase in size for ammonium sulfate (AS) increased by 13.4–30.2% relative to that of glucose. For the mixed-component, the increase in size decreased about 15.9–25.0% with the increase of the glucose. Because the glucose coating on the surface of AS have hindered particle growth. This also shows that atmospheric ultrafine particles, especially inorganic salt particles, will rapidly grow into larger particles under supersaturated conditions such as increased environmental humidity, thus having some impact on environmental pollution and climate change.
Jiejie Bian; Huaqiao Gui; Xiuli Wei; Tongzhu Yu; Zhibo Xie; Jie Wang; Jianguo Liu. Development and Application of a Wide Dynamic Range and High Resolution Atmospheric Aerosol Water-Based Supersaturation Condensation Growth Measurement System. Atmosphere 2021, 12, 558 .
AMA StyleJiejie Bian, Huaqiao Gui, Xiuli Wei, Tongzhu Yu, Zhibo Xie, Jie Wang, Jianguo Liu. Development and Application of a Wide Dynamic Range and High Resolution Atmospheric Aerosol Water-Based Supersaturation Condensation Growth Measurement System. Atmosphere. 2021; 12 (5):558.
Chicago/Turabian StyleJiejie Bian; Huaqiao Gui; Xiuli Wei; Tongzhu Yu; Zhibo Xie; Jie Wang; Jianguo Liu. 2021. "Development and Application of a Wide Dynamic Range and High Resolution Atmospheric Aerosol Water-Based Supersaturation Condensation Growth Measurement System." Atmosphere 12, no. 5: 558.
A thorough understanding of chemical composition, particle pH, and pollutant emissions is essential to address the climate and human health effects of atmospheric particles. In this study, we used a High-Resolution Time-of-Flight Aerosol Mass Spectrometer (HR-ToF-AMS) and Scanning Mobility Particle Sizer (SMPS) to characterize the composition of submicron particles. Moreover, we applied the ISORROPIA-II model to analyze the particle acidity effect on the compositional characterization of submicron particles from December 22, 2016 to January 7, 2017 in Albany, New York, USA. The results indicated that aerosols with mobility diameter from SMPS in the range 200–400 nm were the main contributors to the mass during the measurement period. The dominance of organics (47%) and sulfate (16%) was similar to previous observations in the eastern United States in Winter 2015, while the fraction of nitrate (23%) was much higher. Moreover, nitrate could easily form at colder temperatures and lower RH levels even when there were more acidic particle periods during the measurement period in Albany. The ISORROPIA-II model indicated that there were more acidic particles, which was estimated using pH values. Lower temperature conditions tended to favor nitrate formation. The nitrate concentration exceeded that of sulfate in the measurement period, even though the SO2 and NOx emissions were similar. The organics in submicron particles were strongly influenced by the local emissions in winter. However, the inorganic compounds in submicron particles could be derived from regional transport as their pollution sources originated from different directions. This may help strategize emission reductions in the future.
Xiuli Wei; Huaqiao Gui; Jianguo Liu; Ying Cheng. Characterization of submicron aerosol particles in winter at Albany, New York. Journal of Environmental Sciences 2021, 111, 118 -129.
AMA StyleXiuli Wei, Huaqiao Gui, Jianguo Liu, Ying Cheng. Characterization of submicron aerosol particles in winter at Albany, New York. Journal of Environmental Sciences. 2021; 111 ():118-129.
Chicago/Turabian StyleXiuli Wei; Huaqiao Gui; Jianguo Liu; Ying Cheng. 2021. "Characterization of submicron aerosol particles in winter at Albany, New York." Journal of Environmental Sciences 111, no. : 118-129.
Significant contribution of ultrafine particles in the atmosphere to the cloud condensation nuclei and precipitation has been evidenced. The correlation between the condensation growth and chemical composition of particles is essential in the atmospheric studies. To reduce the lower detection limit of ATOFMS (currently at 200 nm), a water-based particle size amplifier, consisted of a tubing inner-lined with an expanded polytetrafluoroethylene layer and temperature-controlled in three sections, was designed, and its amplification performance was evaluated. With the use of the particle size amplifier, the peaks of Na and Cl in the mass spectra of 50 nm NaCl particles were obviously observed. Further, 50 nm NaCl/Dicarboxylic Acid (DA) particles were generated and characterized by ATOFMS with the amplifier and the sizes of ultrafine particles after the amplifier was measured by an Aerodynamic Particle Spectrometer (APS). It is found that the Cl/Na ratio in 50 nm NaCl + DA particles was negatively correlated with the DA concentration and positively correlated with the acidity coefficient of the DAs, i.e., the high DA mass fraction in particles and low the acidity coefficient of DAs results in strong heterogeneous reaction in the generation of these particles. The amplified sizes of NaCl + DA nanoparticles was also greatly influenced by the degree of the reaction involved. The Cl/Na ratio of NaCl + DA particles was found to have positive correlation with the amplified size of particles.
Zhibo Xie; Huaqiao Gui; Jiaoshi Zhang; Jiejie Bian; Xuejun Gu; Hang Xiao; Da-Ren Chen; Jianguo Liu. Heterogeneous reaction and condensation growth observation of NaCl/dicarboxylic acids nanoparticles by aerosol time-of-flight mass spectrometer with water-based particle size amplifier. Atmospheric Environment 2020, 246, 118162 .
AMA StyleZhibo Xie, Huaqiao Gui, Jiaoshi Zhang, Jiejie Bian, Xuejun Gu, Hang Xiao, Da-Ren Chen, Jianguo Liu. Heterogeneous reaction and condensation growth observation of NaCl/dicarboxylic acids nanoparticles by aerosol time-of-flight mass spectrometer with water-based particle size amplifier. Atmospheric Environment. 2020; 246 ():118162.
Chicago/Turabian StyleZhibo Xie; Huaqiao Gui; Jiaoshi Zhang; Jiejie Bian; Xuejun Gu; Hang Xiao; Da-Ren Chen; Jianguo Liu. 2020. "Heterogeneous reaction and condensation growth observation of NaCl/dicarboxylic acids nanoparticles by aerosol time-of-flight mass spectrometer with water-based particle size amplifier." Atmospheric Environment 246, no. : 118162.
PM2.5 separator directly affects the accuracy of PM2.5 sampling. The specification testing and evaluation for PM2.5 separator is particularly important, especially under China's wide variation of terrain and climate. In this study, first a static test apparatus based on polydisperse aerosol was established and calibrated to evaluate the performance of the PM2.5 separators. A uniform mixing chamber was developed to make particles mix completely. The aerosol concentration relative standard deviations of three test points at the same horizontal chamber position were less than 0.57%, and the particle size distribution obeyed logarithmic normal distribution with an R2 of 0.996. The flow rate deviation between the measurement and the set point flow rate agreed to within ±1.0% in the range of -40 to 50°C. Secondly, the separation, flow and loading characteristics of three cyclone separators (VSCC-A, SCC-A and SCC112) were evaluated using this system. The results showed that the 50% cutoff sizes (D50) of the three cyclones were 2.48, 2.47 and 2.44 μm when worked at the manufacturer's recommended flow rates, respectively. The geometric standard deviation (GSD) of the capture efficiency of VSCC-A was 1.23, showed a slightly sharper than SCC-A (GSD =1.27), while the SCC112 did not meet the relevant indicator (GSD = 1.2 ± 0.1) with a GSD = 1.44. The flow rate and loading test had a great effect on D50, while the GSD remained almost the same as before. In addition, the maintenance frequency under different air pollution conditions of the cyclones was summarized according to the loading test.
Peng Du; Jianguo Liu; Huaqiao Gui; Jiaoshi Zhang; Tongzhu Yu; Jie Wang; Yin Cheng; Yihuai Lu; Yawei Yao; Qiang Fu; ChihChieh Chen. Development of a static test apparatus for evaluating the performance of three PM2.5 separators commonly used in China. Journal of Environmental Sciences 2019, 87, 238 -249.
AMA StylePeng Du, Jianguo Liu, Huaqiao Gui, Jiaoshi Zhang, Tongzhu Yu, Jie Wang, Yin Cheng, Yihuai Lu, Yawei Yao, Qiang Fu, ChihChieh Chen. Development of a static test apparatus for evaluating the performance of three PM2.5 separators commonly used in China. Journal of Environmental Sciences. 2019; 87 ():238-249.
Chicago/Turabian StylePeng Du; Jianguo Liu; Huaqiao Gui; Jiaoshi Zhang; Tongzhu Yu; Jie Wang; Yin Cheng; Yihuai Lu; Yawei Yao; Qiang Fu; ChihChieh Chen. 2019. "Development of a static test apparatus for evaluating the performance of three PM2.5 separators commonly used in China." Journal of Environmental Sciences 87, no. : 238-249.
The effect of the design and process parameters of a particle-classification zone on the sizing precision of a plate differential mobility analyzer (PDMA) was investigated by simulation software in this work. The design parameters consisted of the length, width, and height of the classification zone, and the process parameters could lead to height deviation and an uneven classification-zone wall. Prior to investigating the parameters, a comparison between experimental voltages and PDMA simulation results was applied to validate the simulation model. Thanks to velocity-field and particle-trajectory simulations, as well as experimental data from the former version of the PDMA, the dimensions of the classification zone and other key parameters were optimized. Our research shows that the dimensions of the classification zone influence the applied voltages and the measuring range of the PDMA, and range can be extended to 500 nm with low applied voltages after optimization. When the reasonable error range of the height is ±2% for the classification zone, the PDMA could basically achieve a classification role, and when it is ±1%, the PDMA has a better classifying effect.
Mingjie Chen; Huanqin Wang; Qiang Sun; Fajun Yu; Yuzhong Wang; Wei Wan; Chengpeng Wang; Huaqiao Gui; Jianguo Liu; Liang Lü. Simulation of Miniature PDMA for Ultrafine-Particle Measurement. Atmosphere 2019, 10, 116 .
AMA StyleMingjie Chen, Huanqin Wang, Qiang Sun, Fajun Yu, Yuzhong Wang, Wei Wan, Chengpeng Wang, Huaqiao Gui, Jianguo Liu, Liang Lü. Simulation of Miniature PDMA for Ultrafine-Particle Measurement. Atmosphere. 2019; 10 (3):116.
Chicago/Turabian StyleMingjie Chen; Huanqin Wang; Qiang Sun; Fajun Yu; Yuzhong Wang; Wei Wan; Chengpeng Wang; Huaqiao Gui; Jianguo Liu; Liang Lü. 2019. "Simulation of Miniature PDMA for Ultrafine-Particle Measurement." Atmosphere 10, no. 3: 116.
Huanqin Wang; Wei Wan; Deyi Kong; Feihu Qin; Fajun Yu; Huaqiao Gui; Jianguo Liu; Liang Lu. A wide range fiber turbidity sensor based on single photon detection technique with an optimal optical power. Optical Precision Manufacturing, Testing, and Applications 2018, 1 .
AMA StyleHuanqin Wang, Wei Wan, Deyi Kong, Feihu Qin, Fajun Yu, Huaqiao Gui, Jianguo Liu, Liang Lu. A wide range fiber turbidity sensor based on single photon detection technique with an optimal optical power. Optical Precision Manufacturing, Testing, and Applications. 2018; ():1.
Chicago/Turabian StyleHuanqin Wang; Wei Wan; Deyi Kong; Feihu Qin; Fajun Yu; Huaqiao Gui; Jianguo Liu; Liang Lu. 2018. "A wide range fiber turbidity sensor based on single photon detection technique with an optimal optical power." Optical Precision Manufacturing, Testing, and Applications , no. : 1.
A high-resolution fiber-optic detection system has been developed to measure the wide dynamic range of turbidity. To obtain high-resolution measurement results, a high sensitive single photon detection technique (SPDT) has been used in the system. Based on fiber characteristics, a compact probe structure for fiber-optic integrated transceiver (FITP) is designed to transmitting and collection light signal, which has the capability of detecting turbidity in the narrow workspace. By combining the Beer-Lambert (B-L) law transmission law with single photon counting theory, a novel turbidity measurement theoretical model has been proposed, which shows a good exponential relationship over the whole measurement range from 0.01 to 1000 NTU (Nephelometric Turbidity Units). However, when detecting 0.01-0.1NTU low turbidity, the experimental results turn into an approximate linear relationship, which good agrees with the proposed theoretical model. Last, some issues about the optimization of light intensity and requiring attention on constructing a practical distributed multi-point water turbidity remote monitoring system in the outdoors are also discussed. It was found that the system can achieve a measurement dynamic range as wide as 50dB with a resolution better than 0.01NTU in the range of 0.01 to 1000 NTU, which is suitable for some specific turbidity measurement in remote and narrow workspace.
Huanqin Wang; Juntao Hu; Wei Wan; Huaqiao Gui; Feihu Qin; Fajun Yu; Jianguo Liu; Liang Lü. A wide dynamic range and high resolution all-fiber-optic turbidity measurement system based on single photon detection technique. Measurement 2018, 134, 820 -824.
AMA StyleHuanqin Wang, Juntao Hu, Wei Wan, Huaqiao Gui, Feihu Qin, Fajun Yu, Jianguo Liu, Liang Lü. A wide dynamic range and high resolution all-fiber-optic turbidity measurement system based on single photon detection technique. Measurement. 2018; 134 ():820-824.
Chicago/Turabian StyleHuanqin Wang; Juntao Hu; Wei Wan; Huaqiao Gui; Feihu Qin; Fajun Yu; Jianguo Liu; Liang Lü. 2018. "A wide dynamic range and high resolution all-fiber-optic turbidity measurement system based on single photon detection technique." Measurement 134, no. : 820-824.
An aerosol electrometer with enhanced detection limit was developed for measuring the collected particles electrical current ranging from −50 pA to 50 pA with no range switching necessary. The detection limit was enhanced by suppressing the electric current measurement noise and improving the detection efficiency. A theoretical model for the aerosol electrometer has been established to investigate the noise effect factors and verified experimentally. The model showed that the noise was a function of ambient temperature, and it was affected by the characteristics of feedback resistor and operational amplifier simultaneously. The Faraday cup structure of the aerosol electrometer was optimized by adopting a newly designed cup-shaped metal filter which increased the surface area of the cup; thus the particle interception efficiency was improved. The aerosol electrometer performance-linearity, noise and the particle detection efficiency, were evaluated experimentally. When compared with TSI-3068B, a 99.4% (R2) statistical correlation was achieved. The results also showed that the root mean square noise and the peak-to-peak noise were 0.31 fA and 1.55 fA, respectively. The particle detection efficiency was greater than 99.3% when measuring particle diameter larger than 7.0 nm.
Yixin Yang; Tongzhu Yu; Jiaoshi Zhang; Jian Wang; Wenyu Wang; Huaqiao Gui; Jianguo Liu. On the Performance of an Aerosol Electrometer with Enhanced Detection Limit. Sensors 2018, 18, 3889 .
AMA StyleYixin Yang, Tongzhu Yu, Jiaoshi Zhang, Jian Wang, Wenyu Wang, Huaqiao Gui, Jianguo Liu. On the Performance of an Aerosol Electrometer with Enhanced Detection Limit. Sensors. 2018; 18 (11):3889.
Chicago/Turabian StyleYixin Yang; Tongzhu Yu; Jiaoshi Zhang; Jian Wang; Wenyu Wang; Huaqiao Gui; Jianguo Liu. 2018. "On the Performance of an Aerosol Electrometer with Enhanced Detection Limit." Sensors 18, no. 11: 3889.
A low-noise aerosol electrometer with a wide dynamic range has been designed for measuring the total net charge on high concentration aerosol particles within the range of −500 pA to +500 pA. The performance of the aerosol electrometer was evaluated by a series of experiments to determine linearity, sensitivity and noise. The relative errors were controlled within 5.0%, 1.0% and 0.3% at the range of −40 pA to +40 pA, ±40 pA to ±100 pA, and ±100 pA to ±500 pA respectively. The stability of the designed aerosol electrometer was found to be highly sensitive to temperature variations, but under temperature control, the root mean square noise and the peak-to-peak noise were 1.040 fA and 5.2 fA respectively, which are very close to the calculated theoretical limit of the current noise. The excellent correlation and the advantage of a wide dynamic range have been demonstrated by comparing with the designed aerosol electrometer to a commercial aerosol electrometer. A 99.7% (R2) statistical correlation was obtained; meanwhile, the designed aerosol electrometer operated well even when an overrange phenomenon appeared in the commercial aerosol electrometer.
Yixin Yang; Tongzhu Yu; Jiaoshi Zhang; Wenyu Wang; Huaqiao Gui; Peng Du; Jianguo Liu. Design and Evaluation of an Aerosol Electrometer with Low Noise and a Wide Dynamic Range. Sensors 2018, 18, 1614 .
AMA StyleYixin Yang, Tongzhu Yu, Jiaoshi Zhang, Wenyu Wang, Huaqiao Gui, Peng Du, Jianguo Liu. Design and Evaluation of an Aerosol Electrometer with Low Noise and a Wide Dynamic Range. Sensors. 2018; 18 (5):1614.
Chicago/Turabian StyleYixin Yang; Tongzhu Yu; Jiaoshi Zhang; Wenyu Wang; Huaqiao Gui; Peng Du; Jianguo Liu. 2018. "Design and Evaluation of an Aerosol Electrometer with Low Noise and a Wide Dynamic Range." Sensors 18, no. 5: 1614.
The self-mixing technique based on the traditional reflecting mirror has been demonstrated with great merit for angle sensing applications. In order to solve the problems of the narrow measurement angle range and low resolution in traditional angle measurement method, we proposed an angle measurement system using orthogonal mirror self-mixing interferometry combine an orthogonal mirror with designed mechanical linkage. It overcomes the shortcomings of traditional angle measurement methods and realized the angle measurement with microradian resolution in a full-circle range of 0 rad to 2π rad. In the experiment, the measurement resolution can reach to 5.27 µrad and the absolute error can lower to ± 0.011µrad, which satisfies the requirements of most high accuracy angle measurement.
Chenchen Wang; Xuewei Fan; You Guo; Huaqiao Gui; Huanqing Wang; Jianguo Liu; Benli Yu; Liang Lu. Full-circle range and microradian resolution angle measurement using the orthogonal mirror self-mixing interferometry. Optics Express 2018, 26, 10371 -10381.
AMA StyleChenchen Wang, Xuewei Fan, You Guo, Huaqiao Gui, Huanqing Wang, Jianguo Liu, Benli Yu, Liang Lu. Full-circle range and microradian resolution angle measurement using the orthogonal mirror self-mixing interferometry. Optics Express. 2018; 26 (8):10371-10381.
Chicago/Turabian StyleChenchen Wang; Xuewei Fan; You Guo; Huaqiao Gui; Huanqing Wang; Jianguo Liu; Benli Yu; Liang Lu. 2018. "Full-circle range and microradian resolution angle measurement using the orthogonal mirror self-mixing interferometry." Optics Express 26, no. 8: 10371-10381.
The inorganic compounds in PM2.5 aerosols were measured using a Fourier-transform infrared (FTIR) spectroscopy before Chinese New Year in 2014 in Zhengzhou city, China. We combine the data of gaseous pollutants (NO2 and SO2) to analyze the inorganic compounds in PM2.5 and use the air back trajectories to analyze the effect of transport.
Xiuli Wei; Huaqiao Gui; Jianguo Liu; Minguang Gao; Jiaoshi Zhang; Tongzhu Yu; Yin Cheng. Analysis of the inorganic compounds in PM2.5 aerosols in Zhengzhou using ATR-FTIR method. Light, Energy and the Environment 2018 (E2, FTS, HISE, SOLAR, SSL) 2018, JT2A.15 .
AMA StyleXiuli Wei, Huaqiao Gui, Jianguo Liu, Minguang Gao, Jiaoshi Zhang, Tongzhu Yu, Yin Cheng. Analysis of the inorganic compounds in PM2.5 aerosols in Zhengzhou using ATR-FTIR method. Light, Energy and the Environment 2018 (E2, FTS, HISE, SOLAR, SSL). 2018; ():JT2A.15.
Chicago/Turabian StyleXiuli Wei; Huaqiao Gui; Jianguo Liu; Minguang Gao; Jiaoshi Zhang; Tongzhu Yu; Yin Cheng. 2018. "Analysis of the inorganic compounds in PM2.5 aerosols in Zhengzhou using ATR-FTIR method." Light, Energy and the Environment 2018 (E2, FTS, HISE, SOLAR, SSL) , no. : JT2A.15.
In this paper, a fiber-optic particle size measurement system based on dynamic light scattering(DLS) is developed. The system uses the classic 90° particle size measurement technique, which has high sensitivity and precision.
Huaqiao Gui; Huanqin Wang; Wei Wan; Fajun Yu; Jianguo Liu; Liang Lü. Development of a fiber-optic particle size measurement system based on dynamic light scattering technique. Light, Energy and the Environment 2018 (E2, FTS, HISE, SOLAR, SSL) 2018, JT2A.24 .
AMA StyleHuaqiao Gui, Huanqin Wang, Wei Wan, Fajun Yu, Jianguo Liu, Liang Lü. Development of a fiber-optic particle size measurement system based on dynamic light scattering technique. Light, Energy and the Environment 2018 (E2, FTS, HISE, SOLAR, SSL). 2018; ():JT2A.24.
Chicago/Turabian StyleHuaqiao Gui; Huanqin Wang; Wei Wan; Fajun Yu; Jianguo Liu; Liang Lü. 2018. "Development of a fiber-optic particle size measurement system based on dynamic light scattering technique." Light, Energy and the Environment 2018 (E2, FTS, HISE, SOLAR, SSL) , no. : JT2A.24.
A unipolar charger of submicron aerosol particles has been evaluated. Firstly, a high-voltage field ionization method is utilized to produce sufficient free charges, and an external migrating electric field is then utilized to migrate the free charges into a particle-charging region in order to realize the high-efficient charging of aerosol particles. The charger comprises an impact type particle cutter, a particle-charging chamber and a high-voltage power supply. The charger has a compact structure, which is convenient to maintain and can realize the high-efficient charging of aerosol particles below 1μm. The charger can be used in the pre-stage charging of particles on the basis of an electric migration characteristic monitoring device. For large particles (250–600 nm) the extrinsic charging efficiency of the charger with migration electric field are approximately 1.2 times higher than those of the charger with migration electric field. The charger with migration electric field has advantages of extrinsic charging efficiency, which benefit its application in the aerosol particle charging.
Tong-Zhu Yu; Yi-Xin Yang; Jian-Guo Liu; Hua-Qiao Gui; Jiao-Shi Zhang; Yin Cheng; Jie Wang. Evaluation of a High Efficiency Unipolar Charger for Aerosol Particles. DEStech Transactions on Environment, Energy and Earth Sciences 2017, 1 .
AMA StyleTong-Zhu Yu, Yi-Xin Yang, Jian-Guo Liu, Hua-Qiao Gui, Jiao-Shi Zhang, Yin Cheng, Jie Wang. Evaluation of a High Efficiency Unipolar Charger for Aerosol Particles. DEStech Transactions on Environment, Energy and Earth Sciences. 2017; (edep):1.
Chicago/Turabian StyleTong-Zhu Yu; Yi-Xin Yang; Jian-Guo Liu; Hua-Qiao Gui; Jiao-Shi Zhang; Yin Cheng; Jie Wang. 2017. "Evaluation of a High Efficiency Unipolar Charger for Aerosol Particles." DEStech Transactions on Environment, Energy and Earth Sciences , no. edep: 1.
Jiaoshi Zhang; Zhenyi Chen; Yihuai Lu; Huaqiao Gui; Jianguo Liu; Wenqing Liu; Jie Wang; Tongzhu Yu; Yin Cheng; Yong Chen; Baozhu Ge; Yu Fan; Xisheng Luo. Characteristics of aerosol size distribution and vertical backscattering coefficient profile during 2014 APEC in Beijing. Atmospheric Environment 2017, 148, 30 -41.
AMA StyleJiaoshi Zhang, Zhenyi Chen, Yihuai Lu, Huaqiao Gui, Jianguo Liu, Wenqing Liu, Jie Wang, Tongzhu Yu, Yin Cheng, Yong Chen, Baozhu Ge, Yu Fan, Xisheng Luo. Characteristics of aerosol size distribution and vertical backscattering coefficient profile during 2014 APEC in Beijing. Atmospheric Environment. 2017; 148 ():30-41.
Chicago/Turabian StyleJiaoshi Zhang; Zhenyi Chen; Yihuai Lu; Huaqiao Gui; Jianguo Liu; Wenqing Liu; Jie Wang; Tongzhu Yu; Yin Cheng; Yong Chen; Baozhu Ge; Yu Fan; Xisheng Luo. 2017. "Characteristics of aerosol size distribution and vertical backscattering coefficient profile during 2014 APEC in Beijing." Atmospheric Environment 148, no. : 30-41.
The self-mixing technique based on the traditional reflecting mirror has been demonstrated with great merit for angle sensing applications. Here we demonstrate a modified self-reflection-mixing angle measurement system by combine a right-angle prism to self-mixing angle measurement. In our system, the wavelength is crucial to the angle measurement resolution. For a microchip solid-state laser, the measurement resolution can reach 0.49 mrad, while the resolution for the He-Ne laser is 0.53 mrad. In addition, the ranges in the system with the microchip solid-state laser and He-Ne laser are up to 22 mrad and 24.9 mrad respectively. This modified angle measurement system effectively combines the advantage of self-mixing measurement system with a compact structure, providing interesting features such as of high requisition of resolution and precision.
Bo Yang; Dehui Wang; Lin Zhou; Shuang Wu; Rong Xiang; Wenhua Zhang; Huaqiao Gui; Jianguo Liu; Huanqing Wang; Liang Lu; Benli Yu. A ultra-small-angle self-mixing sensor system with high detection resolution and wide measurement range. Optics & Laser Technology 2016, 91, 92 -97.
AMA StyleBo Yang, Dehui Wang, Lin Zhou, Shuang Wu, Rong Xiang, Wenhua Zhang, Huaqiao Gui, Jianguo Liu, Huanqing Wang, Liang Lu, Benli Yu. A ultra-small-angle self-mixing sensor system with high detection resolution and wide measurement range. Optics & Laser Technology. 2016; 91 ():92-97.
Chicago/Turabian StyleBo Yang; Dehui Wang; Lin Zhou; Shuang Wu; Rong Xiang; Wenhua Zhang; Huaqiao Gui; Jianguo Liu; Huanqing Wang; Liang Lu; Benli Yu. 2016. "A ultra-small-angle self-mixing sensor system with high detection resolution and wide measurement range." Optics & Laser Technology 91, no. : 92-97.
An optimized tunable fiber laser has been proposed by using a novelty developed silver diaphragm at the end of coupled cavity of the tunable fiber laser. The total tuning range is about 15 nm by using a combination of axial compressive strain and a tensile strain. The lasing mode regime of tunable fiber laser is determined by the fiber laser compound cavity. Experimental results demonstrate that the characteristics of tunable fiber laser with external cavity not only present good stability performances with the output power variation about 0.2 dB and the wavelength fluctuation less than 0.08 nm, but also could reduce threshold pump power, decrease the linewidth from 19.557 kHz to 7.271 kHz by coupling silver membrane at the end of the fiber truncation. The optimized tunable fiber laser of external cavity configuration is in good agreement with the theoretical analysis and has many potential applications in sensing and communication system for high sensitivity and remote measurement.
Rong Xiang; Junfeng Zhou; Wenhua Zhang; Dehui Wang; Liang Lu; Huanqing Wang; Huaqiao Gui; Jianguo Liu; Benli Yu. Tunable fiber laser with nano-thick silver diaphragm as compound external cavity. Optik 2016, 127, 8367 -8373.
AMA StyleRong Xiang, Junfeng Zhou, Wenhua Zhang, Dehui Wang, Liang Lu, Huanqing Wang, Huaqiao Gui, Jianguo Liu, Benli Yu. Tunable fiber laser with nano-thick silver diaphragm as compound external cavity. Optik. 2016; 127 (20):8367-8373.
Chicago/Turabian StyleRong Xiang; Junfeng Zhou; Wenhua Zhang; Dehui Wang; Liang Lu; Huanqing Wang; Huaqiao Gui; Jianguo Liu; Benli Yu. 2016. "Tunable fiber laser with nano-thick silver diaphragm as compound external cavity." Optik 127, no. 20: 8367-8373.
Xisheng Luo; Yu Fan; Fenghua Qin; Huaqiao Gui; Jianguo Liu. A new model for the processes of droplet condensation and evaporation on solid surface. International Journal of Heat and Mass Transfer 2016, 100, 208 -214.
AMA StyleXisheng Luo, Yu Fan, Fenghua Qin, Huaqiao Gui, Jianguo Liu. A new model for the processes of droplet condensation and evaporation on solid surface. International Journal of Heat and Mass Transfer. 2016; 100 ():208-214.
Chicago/Turabian StyleXisheng Luo; Yu Fan; Fenghua Qin; Huaqiao Gui; Jianguo Liu. 2016. "A new model for the processes of droplet condensation and evaporation on solid surface." International Journal of Heat and Mass Transfer 100, no. : 208-214.
In this paper, a novel velocimeter based on laser self-mixing Doppler technology has been developed for speed measurement. The laser employed in our experiment is a distributed feedback (DFB) fiber laser, which is an all-fiber structure using only one Fiber Bragg Grating to realize optical feedback and wavelength selection. Self-mixing interference for optical velocity sensing is experimentally investigated in this novel system, and the experimental results show that the Doppler frequency is linearly proportional to the velocity of a moving target, which agrees with the theoretical analysis commendably. In our experimental system, the velocity measurement can be achieved in the range of 3.58 mm/s–2216 mm/s with a relative error under one percent, demonstrating that our novel all-fiber configuration velocimeter can implement wide-range velocity measurements with high accuracy.
Shuang Wu; Dehui Wang; Rong Xiang; Junfeng Zhou; Yangcheng Ma; Huaqiao Gui; Jianguo Liu; Huanqin Wang; Liang Lu; Benli Yu. All-Fiber Configuration Laser Self-Mixing Doppler Velocimeter Based on Distributed Feedback Fiber Laser. Sensors 2016, 16, 1179 .
AMA StyleShuang Wu, Dehui Wang, Rong Xiang, Junfeng Zhou, Yangcheng Ma, Huaqiao Gui, Jianguo Liu, Huanqin Wang, Liang Lu, Benli Yu. All-Fiber Configuration Laser Self-Mixing Doppler Velocimeter Based on Distributed Feedback Fiber Laser. Sensors. 2016; 16 (8):1179.
Chicago/Turabian StyleShuang Wu; Dehui Wang; Rong Xiang; Junfeng Zhou; Yangcheng Ma; Huaqiao Gui; Jianguo Liu; Huanqin Wang; Liang Lu; Benli Yu. 2016. "All-Fiber Configuration Laser Self-Mixing Doppler Velocimeter Based on Distributed Feedback Fiber Laser." Sensors 16, no. 8: 1179.
Based on a single-channel laser self-mixing interferometer, we present a new simultaneous measurement of the vibration amplitude and the rotation angle of objects that both affect the power spectrum containing two peaks of the interferometer signals. The fitted results indicate that the curve of the peak frequency versus the vibration amplitude follows a linear distribution, and the curve of the difference of the two-peak power values versus the angle follows a Gaussian distribution. A vibration amplitude with an error less than 3.0% and a rotation angle with an error less than 11.7% are calculated from the fitted results.
Wu Sun; Jianguo Liu; Huaqiao Gui; Anli Lu; Huanqin Wang. Simultaneous measurement of vibration amplitude and rotation angle based on a single-channel laser self-mixing interferometer. Chinese Optics Letters 2016, 14, 21201 -21204.
AMA StyleWu Sun, Jianguo Liu, Huaqiao Gui, Anli Lu, Huanqin Wang. Simultaneous measurement of vibration amplitude and rotation angle based on a single-channel laser self-mixing interferometer. Chinese Optics Letters. 2016; 14 (2):21201-21204.
Chicago/Turabian StyleWu Sun; Jianguo Liu; Huaqiao Gui; Anli Lu; Huanqin Wang. 2016. "Simultaneous measurement of vibration amplitude and rotation angle based on a single-channel laser self-mixing interferometer." Chinese Optics Letters 14, no. 2: 21201-21204.