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In this work, we obtained chirped Bragg gratings by post-coating uniform poly (methylmethacrylate) (PMMA) microstructured polymer optical fiber Bragg gratings (POFBGs) with an UV cure adhesive. The main advantage of the proposed method consists on being a cost-effective and simple solution, since no special phase mask, additional etching or gradient thermal annealing are required. A comparison between the fabricated chirped Bragg grating’s performance and previous reported methods in the literature is presented. As a compact sensor with two different active areas (adhesive coated and uncoated sections of the POFBG), the developed sensing device can be used for multiparameter sensing, namely for strain, humidity and temperature monitoring. Allying the proposed flexible and low-cost fabrication technique with the intrinsic characteristics of POFs, one may conclude that the developed sensor has high potential for multiparameter sensing in possible future engineering and biomedical applications.
Rui Min; Luis Pereira; Tiago Paixao; Getinet Woyessa; Xuehao Hu; Paulo Antunes; Paulo Andre; Ole Bang; Joao Pinto; Beatriz Ortega; Carlos Marques. Chirped POF Bragg grating production utilizing UV cure adhesive coating for multiparameter sensing. Optical Fiber Technology 2021, 65, 102593 .
AMA StyleRui Min, Luis Pereira, Tiago Paixao, Getinet Woyessa, Xuehao Hu, Paulo Antunes, Paulo Andre, Ole Bang, Joao Pinto, Beatriz Ortega, Carlos Marques. Chirped POF Bragg grating production utilizing UV cure adhesive coating for multiparameter sensing. Optical Fiber Technology. 2021; 65 ():102593.
Chicago/Turabian StyleRui Min; Luis Pereira; Tiago Paixao; Getinet Woyessa; Xuehao Hu; Paulo Antunes; Paulo Andre; Ole Bang; Joao Pinto; Beatriz Ortega; Carlos Marques. 2021. "Chirped POF Bragg grating production utilizing UV cure adhesive coating for multiparameter sensing." Optical Fiber Technology 65, no. : 102593.
In this study, we investigated plastic optical fiber (POF) pressure sensors embedded in mattresses to measure respiration and heart rate for sleep performance monitoring. The signal is amplified in the circuit using a two-stage amplification scheme to collect weak respiration and heart rate signals while an algorithm was designed to obtain respiration and heart rate. We also propose a good reliability cutting-POF technology which can be used to improve pressure sensitivity. The experimental results indicate that the mattress can distinguish four behavioral states related to sleep (on bed, lying, moving and leaving bed) and can detect respiration and heart rate values in different positions and postures. Validation experiments on 10 participants showed that absolute error was less than one breath per minute and two beats per minute, making our approach suitable for household sleeping monitoring.
Pengfei Han; Linqing Li; Hao Zhang; Longzhou Guan; Carlos Marques; Svetislav Savović; Beatriz Ortega; Rui Min; Xiaoli Li. Low-cost plastic optical fiber sensor embedded in mattress for sleep performance monitoring. Optical Fiber Technology 2021, 64, 102541 .
AMA StylePengfei Han, Linqing Li, Hao Zhang, Longzhou Guan, Carlos Marques, Svetislav Savović, Beatriz Ortega, Rui Min, Xiaoli Li. Low-cost plastic optical fiber sensor embedded in mattress for sleep performance monitoring. Optical Fiber Technology. 2021; 64 ():102541.
Chicago/Turabian StylePengfei Han; Linqing Li; Hao Zhang; Longzhou Guan; Carlos Marques; Svetislav Savović; Beatriz Ortega; Rui Min; Xiaoli Li. 2021. "Low-cost plastic optical fiber sensor embedded in mattress for sleep performance monitoring." Optical Fiber Technology 64, no. : 102541.
Optical fiber sensors have attracted considerable attention for marine environment and marine structural health monitoring, owing to advantages including resistance to electromagnetic interference, durability under extreme temperature and pressures, light weight, high transmission rate, small size and flexibility. In this paper, the optical fiber sensors employed for marine environment and marine structural health monitoring are summarized for the understanding of their basic sensing principles, and their various sensing applications such as physical parameters, chemical parameters and structural health monitoring. This review paper shows the feasibility of using optical fiber sensing technology for marine application and, due to the aforementioned advantages, it is possible to envisage a widespread use in this research field in the next few years.
Rui Min; Zhengyong Liu; Luis Pereira; Chenkun Yang; Qi Sui; Carlos Marques. Optical fiber sensing for marine environment and marine structural health monitoring: A review. Optics & Laser Technology 2021, 140, 107082 .
AMA StyleRui Min, Zhengyong Liu, Luis Pereira, Chenkun Yang, Qi Sui, Carlos Marques. Optical fiber sensing for marine environment and marine structural health monitoring: A review. Optics & Laser Technology. 2021; 140 ():107082.
Chicago/Turabian StyleRui Min; Zhengyong Liu; Luis Pereira; Chenkun Yang; Qi Sui; Carlos Marques. 2021. "Optical fiber sensing for marine environment and marine structural health monitoring: A review." Optics & Laser Technology 140, no. : 107082.
In this paper, two configurations are presented for simultaneous measurement of strain and temperature by reducing the cross-section area in small regions of the fiber where the Bragg gratings were inscribed, to achieve dual sensitivity to strain and handle the cross-sensitivity to temperature of a single grating. Each configuration used a single Bragg grating inscribed in a 2-ring undoped poly (methyl methacrylate) microstructured polymer optical fiber (mPOF) with a pulsed Q-switched Nd:YAG laser system. To reduce the cross-section area, a femtosecond laser system was used to remove portions of the mPOF, creating micromachined slots in the fiber, with different lengths for each configuration. The result was the appearance of a second peak when strain is applied, with a higher strain sensitivity. The thermal, humidity and refractive index response of these gratings were analyzed, revealing a thermal sensitivity almost twice the value of a common Bragg grating inscribed in the same mPOF. The maximum root mean square errors obtained when both strain and temperature are applied in these grating devices were 52 με% and 0.675 °C, respectively. These results show that the method used to produce these devices could be a suitable and reliable option to fabricate very compact sensors to simultaneously measure strain and other parameters, such as temperature. Moreover, these devices may be used as phase-shift gratings since the position of the reflective peaks and their relative spectral separation may be modulated by applying strain to the optical fiber.
Luis Pereira; Rui Min; Tiago Paixao; Carlos Marques; Getinet Woyessa; Ole Bang; Joao Lemos Pinto; Paulo Fernando Da Costa Antunes. Compact Dual-Strain Sensitivity Polymer Optical Fiber Grating for Multi-Parameter Sensing. Journal of Lightwave Technology 2020, 39, 2230 -2240.
AMA StyleLuis Pereira, Rui Min, Tiago Paixao, Carlos Marques, Getinet Woyessa, Ole Bang, Joao Lemos Pinto, Paulo Fernando Da Costa Antunes. Compact Dual-Strain Sensitivity Polymer Optical Fiber Grating for Multi-Parameter Sensing. Journal of Lightwave Technology. 2020; 39 (7):2230-2240.
Chicago/Turabian StyleLuis Pereira; Rui Min; Tiago Paixao; Carlos Marques; Getinet Woyessa; Ole Bang; Joao Lemos Pinto; Paulo Fernando Da Costa Antunes. 2020. "Compact Dual-Strain Sensitivity Polymer Optical Fiber Grating for Multi-Parameter Sensing." Journal of Lightwave Technology 39, no. 7: 2230-2240.
To address the issues of high time consumption of frame synchronization involved in a scanning-free Brillouin optical time-domain analysis (SF-BOTDA) system, a fast frame synchronization algorithm based on incremental updating was proposed. In comparison to the standard frame synchronization algorithm, the proposed one significantly reduced the processing time required for the BOTDA system frame synchronization by about 98%. In addition, to further accelerate the real-time performance of frame synchronization, a field programmable gate array (FPGA) hardware implementation architecture based on parallel processing and pipelining mechanisms was also proposed. Compared with the software implementation, it further raised the processing speed by 13.41 times. The proposed approach could lay a foundation for the BOTDA system in the field with the associated high real-time requirements.
Qiuyi Pan; Xincheng Huang; Rui Min; Weiping Liu. Fast Frame Synchronization Design and FPGA Implementation in SF-BOTDA. Photonics 2020, 7, 17 .
AMA StyleQiuyi Pan, Xincheng Huang, Rui Min, Weiping Liu. Fast Frame Synchronization Design and FPGA Implementation in SF-BOTDA. Photonics. 2020; 7 (1):17.
Chicago/Turabian StyleQiuyi Pan; Xincheng Huang; Rui Min; Weiping Liu. 2020. "Fast Frame Synchronization Design and FPGA Implementation in SF-BOTDA." Photonics 7, no. 1: 17.
Arnaldo Leal Junior; M. Fátima Domingues; Rui Min; Débora Vilarinho; Antreas Theodosiou; Cátia Tavares; Nélia Alberto; Cátia Leitão; Kyriacos Kalli; Anselmo Frizera-Neto; Paulo André; Paulo Antunes; Carlos Marques. Fiber Bragg Based Sensors for Foot Plantar Pressure Analysis. Communications in Computer and Information Science 2019, 3 -25.
AMA StyleArnaldo Leal Junior, M. Fátima Domingues, Rui Min, Débora Vilarinho, Antreas Theodosiou, Cátia Tavares, Nélia Alberto, Cátia Leitão, Kyriacos Kalli, Anselmo Frizera-Neto, Paulo André, Paulo Antunes, Carlos Marques. Fiber Bragg Based Sensors for Foot Plantar Pressure Analysis. Communications in Computer and Information Science. 2019; ():3-25.
Chicago/Turabian StyleArnaldo Leal Junior; M. Fátima Domingues; Rui Min; Débora Vilarinho; Antreas Theodosiou; Cátia Tavares; Nélia Alberto; Cátia Leitão; Kyriacos Kalli; Anselmo Frizera-Neto; Paulo André; Paulo Antunes; Carlos Marques. 2019. "Fiber Bragg Based Sensors for Foot Plantar Pressure Analysis." Communications in Computer and Information Science , no. : 3-25.
The characterization of Fiber Bragg Grating (FBG) sensors on a high-scattering fiber, having the core doped with MgO nanoparticles for polarization-dependent temperature sensing is reported. The fiber has a scattering level 37.2 dB higher than a single-mode fiber. FBGs have been inscribed by mean of a near-infrared femtosecond laser and a phase mask, with Bragg wavelength around 1552 nm. The characterization shows a thermal sensitivity of 11.45 pm/°C. A polarization-selective thermal behavior has been obtained, with sensitivity of 11.53 pm/°C for the perpendicular polarization (S) and 11.08 pm/°C for the parallel polarization (P), thus having 4.0% different sensitivity between the two polarizations. The results show the inscription of high-reflectivity FBGs onto a fiber core doped with nanoparticles, with the possibility of having reflectors into a fiber with tailored Rayleigh scattering properties.
Carlo Molardi; Tiago Paixão; Aidana Beisenova; Rui Min; Paulo Antunes; Carlos Marques; Wilfried Blanc; Daniele Tosi. Fiber Bragg Grating (FBG) Sensors in a High-Scattering Optical Fiber Doped with MgO Nanoparticles for Polarization-Dependent Temperature Sensing. Applied Sciences 2019, 9, 3107 .
AMA StyleCarlo Molardi, Tiago Paixão, Aidana Beisenova, Rui Min, Paulo Antunes, Carlos Marques, Wilfried Blanc, Daniele Tosi. Fiber Bragg Grating (FBG) Sensors in a High-Scattering Optical Fiber Doped with MgO Nanoparticles for Polarization-Dependent Temperature Sensing. Applied Sciences. 2019; 9 (15):3107.
Chicago/Turabian StyleCarlo Molardi; Tiago Paixão; Aidana Beisenova; Rui Min; Paulo Antunes; Carlos Marques; Wilfried Blanc; Daniele Tosi. 2019. "Fiber Bragg Grating (FBG) Sensors in a High-Scattering Optical Fiber Doped with MgO Nanoparticles for Polarization-Dependent Temperature Sensing." Applied Sciences 9, no. 15: 3107.
An efficient method of reconstructing the phase distribution for off-axis digital holography is proposed using hologram multiplexing with hologram rotation and complex encoding. A first hologram and a second 180° rotated hologram from a hologram sequence are first assembled into a synthetic hologram using the complex encoding method. Then, digital reconstruction processes, including Fourier transformation and band-pass filtering, are performed on both holograms together. Results including phase distributions and carrier information of the two holograms are obtained. Through a division operation, carrier can be removed without redundant operations, fitting procedures, or prior knowledge of the system. Our simulations and experiments demonstrate the feasibility and validity of the method. The results obtained show an accurate phase reconstruction with an improved processing speed.
Hongyi Bai; Rui Min; Ziheng Yang. Phase retrieval for off-axis digital holography using multiplexing with hologram rotation and complex encoding. Optical Review 2019, 26, 549 -560.
AMA StyleHongyi Bai, Rui Min, Ziheng Yang. Phase retrieval for off-axis digital holography using multiplexing with hologram rotation and complex encoding. Optical Review. 2019; 26 (6):549-560.
Chicago/Turabian StyleHongyi Bai; Rui Min; Ziheng Yang. 2019. "Phase retrieval for off-axis digital holography using multiplexing with hologram rotation and complex encoding." Optical Review 26, no. 6: 549-560.
In this paper, we report the development of fiber Bragg gratings (FBGs) arrays in polymer optical fibers (POFs), specifically cyclic transparent optical polymer (CYTOP) fibers, using a femtosecond (fs) laser. The CYTOP is almost transparent to near-ultraviolet and visible light thus femtosecond lasers appear to be a very promising technology for the development of gratings in such fibers. Bearing this in mind, we have applied the direct write, plane-by-plane inscription method to obtain ‘single-peak’ FBGs in long arrays. Following this, we examine the performance of a 5-FBG array applied in a smart walker (SW) and characterized for four different functionalities of the proposed healthcare device. The polymer sensors were used to analyze: (i) structural health monitoring (SHM) of the SW’s mechanical structure, (ii) detection of users’ movement intention, (iii) gait cadence estimation and (iv) detection of floor-induced vibrations for localization and mapping applications. The good results obtained in comparison to commercially available devices show the suitability of the proposed FBG-array on the instrumentation of healthcare devices, where multiple parameters can be measured using the same fiber, which leads to a compact and energy efficient system.
Arnaldo G. Leal-Junior; Anselmo Frizera; Antreas Theodosiou; Camilo Diaz; Mario Jimenez; Rui Min; Maria Jose Pontes; Kyriacos Kalli; Carlos Marques. Plane-by-Plane Written, Low-Loss Polymer Optical Fiber Bragg Grating Arrays for Multiparameter Sensing in a Smart Walker. IEEE Sensors Journal 2019, 19, 9221 -9228.
AMA StyleArnaldo G. Leal-Junior, Anselmo Frizera, Antreas Theodosiou, Camilo Diaz, Mario Jimenez, Rui Min, Maria Jose Pontes, Kyriacos Kalli, Carlos Marques. Plane-by-Plane Written, Low-Loss Polymer Optical Fiber Bragg Grating Arrays for Multiparameter Sensing in a Smart Walker. IEEE Sensors Journal. 2019; 19 (20):9221-9228.
Chicago/Turabian StyleArnaldo G. Leal-Junior; Anselmo Frizera; Antreas Theodosiou; Camilo Diaz; Mario Jimenez; Rui Min; Maria Jose Pontes; Kyriacos Kalli; Carlos Marques. 2019. "Plane-by-Plane Written, Low-Loss Polymer Optical Fiber Bragg Grating Arrays for Multiparameter Sensing in a Smart Walker." IEEE Sensors Journal 19, no. 20: 9221-9228.
Grating devices in polymer optical fibers (POFs) have attracted huge interest for many potential applications in recent years. This paper presents the state of the art regarding the fabrication of different types of POF gratings, such as uniform, phase-shifted, tilted, chirped, and long period gratings, and explores potential application scenarios, such as biosensing and optical communications.
Rui Min; Beatriz Ortega; Carlos Marques. Latest Achievements in Polymer Optical Fiber Gratings: Fabrication and Applications. Photonics 2019, 6, 36 .
AMA StyleRui Min, Beatriz Ortega, Carlos Marques. Latest Achievements in Polymer Optical Fiber Gratings: Fabrication and Applications. Photonics. 2019; 6 (2):36.
Chicago/Turabian StyleRui Min; Beatriz Ortega; Carlos Marques. 2019. "Latest Achievements in Polymer Optical Fiber Gratings: Fabrication and Applications." Photonics 6, no. 2: 36.
We report the application of fiber Bragg grating (FBG) arrays in polymer optical fibers for the quasi-distributed displacement and torque sensing in a series elastic actuator's spring. The arrays were inscribed in cyclic transparent optical polymer fiber through the direct-write, plane-by-plane inscription method using a femtosecond laser. Two arrays with four FBGs each were positioned on a rotary spring, and a numerical analysis using the finite-element method was performed to evaluate the sensors' behavior under different loading conditions. Experimental tests were performed on the spring, and the results show that the FBGs responses follow the predicted numerical simulations. In addition, a Kalman filter was applied on the response of the FBGs for sensor fusion, leading to a more accurate torque estimation, where the relative error for the torque estimation was improved by a factor of 7. Furthermore, transverse forces were applied on the predefined points of the spring in order to show the ability of the quasi-distributed sensor approach to identify external mechanical disturbances on the spring.
Arnaldo G. Leal-Junior; Antreas Theodosiou; Rui Min; Jonathan Casas; Camilo R. Diaz; Wilian M. Dos Santos; Maria Jose Pontes; Adriano A. G. Siqueira; Carlos Marques; Kyriacos Kalli; Anselmo Frizera. Quasi-Distributed Torque and Displacement Sensing on a Series Elastic Actuator’s Spring Using FBG Arrays Inscribed in CYTOP Fibers. IEEE Sensors Journal 2019, 19, 4054 -4061.
AMA StyleArnaldo G. Leal-Junior, Antreas Theodosiou, Rui Min, Jonathan Casas, Camilo R. Diaz, Wilian M. Dos Santos, Maria Jose Pontes, Adriano A. G. Siqueira, Carlos Marques, Kyriacos Kalli, Anselmo Frizera. Quasi-Distributed Torque and Displacement Sensing on a Series Elastic Actuator’s Spring Using FBG Arrays Inscribed in CYTOP Fibers. IEEE Sensors Journal. 2019; 19 (11):4054-4061.
Chicago/Turabian StyleArnaldo G. Leal-Junior; Antreas Theodosiou; Rui Min; Jonathan Casas; Camilo R. Diaz; Wilian M. Dos Santos; Maria Jose Pontes; Adriano A. G. Siqueira; Carlos Marques; Kyriacos Kalli; Anselmo Frizera. 2019. "Quasi-Distributed Torque and Displacement Sensing on a Series Elastic Actuator’s Spring Using FBG Arrays Inscribed in CYTOP Fibers." IEEE Sensors Journal 19, no. 11: 4054-4061.
We obtained chirped gratings by performing hot water gradient thermal annealing of uniform poly (methylmethacrylate) (PMMA) microstructured polymer optical fiber Bragg gratings (POFBGs). The proposed method’s simplicity is one of its main advantages because no special phase mask or additional etching are needed. It not only enables easy control tuning of the central wavelength and chirp characteristics, but it also leads to obtain flexible grating response, compared with tapered chirped POFBGs. Therefore, a flexible and low-cost chirped POFBG devices fabrication technique has been presented by using a single uniform phase mask.
Rui Min; Beatriz Ortega; Christian Broadway; Christophe Caucheteur; Getinet Woyessa; Ole Bang; Paulo Antunes; Carlos Marques. Hot water-assisted fabrication of chirped polymer optical fiber Bragg gratings. Optics Express 2018, 26, 34655 -34664.
AMA StyleRui Min, Beatriz Ortega, Christian Broadway, Christophe Caucheteur, Getinet Woyessa, Ole Bang, Paulo Antunes, Carlos Marques. Hot water-assisted fabrication of chirped polymer optical fiber Bragg gratings. Optics Express. 2018; 26 (26):34655-34664.
Chicago/Turabian StyleRui Min; Beatriz Ortega; Christian Broadway; Christophe Caucheteur; Getinet Woyessa; Ole Bang; Paulo Antunes; Carlos Marques. 2018. "Hot water-assisted fabrication of chirped polymer optical fiber Bragg gratings." Optics Express 26, no. 26: 34655-34664.
Interest in polymer optical fiber Bragg gratings (POFBGs) arises from the different material properties and sensing modalities brought by polymers relative to silica. Polymer fibers typically offer twice the sensitivity to temperature of conventional silica fiber and increased sensitivity to strain overall. In addition, polymer fibers have higher elastic limits and as a result a larger range of operation for physical constraints. While some polymers are effectively humidity insensitive, others present inherent humidity sensitivity. Their organic properties also allow a variety of chemical processes to create (bio)chemical sensors, with the consequences of fiber breakage in situ being less hazardous than silica. These attributes have led to the use of POFBGs for applications that remain complex using silica fibers. This review article covers the progress towards commercialization and the increasing number of specific applications.
Christian Broadway; Rui Min; Arnaldo Gomes Leal-Junior; Carlos Marques; Christophe Caucheteur. Toward Commercial Polymer Fiber Bragg Grating Sensors: Review and Applications. Journal of Lightwave Technology 2018, 37, 2605 -2615.
AMA StyleChristian Broadway, Rui Min, Arnaldo Gomes Leal-Junior, Carlos Marques, Christophe Caucheteur. Toward Commercial Polymer Fiber Bragg Grating Sensors: Review and Applications. Journal of Lightwave Technology. 2018; 37 (11):2605-2615.
Chicago/Turabian StyleChristian Broadway; Rui Min; Arnaldo Gomes Leal-Junior; Carlos Marques; Christophe Caucheteur. 2018. "Toward Commercial Polymer Fiber Bragg Grating Sensors: Review and Applications." Journal of Lightwave Technology 37, no. 11: 2605-2615.
We demonstrate a largely tunable dispersion fiber Bragg grating (FBG) inscribed in a microstructured polymer optical fiber (mPOF). The bandwidth of the chirped FBG (CFBG) was achieved from 0.11 to 4.86 nm, which corresponds to a tunable dispersion range from 513.6 to 11.15 ps/nm. Furthermore, thermal sensitivity is used to compensate for the wavelength shift due to the applied strain. These results demonstrate that a CFBG in a POF is a promising technology for future optical systems.
Rui Min; Sanzhar Korganbayev; Carlo Molardi; Christian Broadway; Xuehao Hu; Christophe Caucheteur; Ole Bang; Paulo Antunes; Daniele Tosi; Carlos Marques; Beatriz Ortega. Largely tunable dispersion chirped polymer FBG. Optics Letters 2018, 43, 5106 -5109.
AMA StyleRui Min, Sanzhar Korganbayev, Carlo Molardi, Christian Broadway, Xuehao Hu, Christophe Caucheteur, Ole Bang, Paulo Antunes, Daniele Tosi, Carlos Marques, Beatriz Ortega. Largely tunable dispersion chirped polymer FBG. Optics Letters. 2018; 43 (20):5106-5109.
Chicago/Turabian StyleRui Min; Sanzhar Korganbayev; Carlo Molardi; Christian Broadway; Xuehao Hu; Christophe Caucheteur; Ole Bang; Paulo Antunes; Daniele Tosi; Carlos Marques; Beatriz Ortega. 2018. "Largely tunable dispersion chirped polymer FBG." Optics Letters 43, no. 20: 5106-5109.
We demonstrate a chirped microstructured polymer fiber Bragg grating based on taper technology for strain sensing application. The effective bandwidth of the grating is dependent on strain and remains practically constant with respect to temperature and humidity changes. We report a sensitivity of 0.90 pm/µε for the central wavelength under stable temperature and humidity values. The 3-dB bandwidth of the grating has been measured under different temperature and humidity conditions.
Rui Min; Beatriz Ortega; Christian Broadway; Xuehao Hu; Christophe Caucheteur; Ole Bang; Paulo Antunes; Carlos Marques. Microstructured PMMA POF chirped Bragg gratings for strain sensing. Optical Fiber Technology 2018, 45, 330 -335.
AMA StyleRui Min, Beatriz Ortega, Christian Broadway, Xuehao Hu, Christophe Caucheteur, Ole Bang, Paulo Antunes, Carlos Marques. Microstructured PMMA POF chirped Bragg gratings for strain sensing. Optical Fiber Technology. 2018; 45 ():330-335.
Chicago/Turabian StyleRui Min; Beatriz Ortega; Christian Broadway; Xuehao Hu; Christophe Caucheteur; Ole Bang; Paulo Antunes; Carlos Marques. 2018. "Microstructured PMMA POF chirped Bragg gratings for strain sensing." Optical Fiber Technology 45, no. : 330-335.
In this paper, a linearly chirped fiber Bragg grating (CFBG) inscribed in a microstructured polymer optical fiber (mPOF) has been demonstrated for detecting temperature profiles during thermal treatments. A CFBG of 10-mm length and 0.98-nm bandwidth has been inscribed in an mPOF fiber by means of a KrF laser and uniform phase mask. The CFBG has a high temperature sensitivity of -191.4 pm/°C. The CFBG has been used as a semi-distributed temperature sensor, capable of detecting the temperature profile along the grating length, for scenarios that account minimally invasive biomedical treatments. Two experiments have been designed to validate the CFBG temperature reconstruction, using a linear gradient, and a research-grade radiofrequency ablation setup to apply Gaussian-shaped temperature spatial profiles. The result is that the higher sensitivity of the CFBG supports the detection of spatially nonuniform temperature fields by means of spectral reconstruction.
Sanzhar Korganbayev; Rui Min; Madina Jelbuldina; Xuehao Hu; Christophe Caucheteur; Ole Bang; Beatriz Ortega; Carlos Marques; Daniele Tosi; Min Rui. Thermal Profile Detection Through High-Sensitivity Fiber Optic Chirped Bragg Grating on Microstructured PMMA Fiber. Journal of Lightwave Technology 2018, 36, 4723 -4729.
AMA StyleSanzhar Korganbayev, Rui Min, Madina Jelbuldina, Xuehao Hu, Christophe Caucheteur, Ole Bang, Beatriz Ortega, Carlos Marques, Daniele Tosi, Min Rui. Thermal Profile Detection Through High-Sensitivity Fiber Optic Chirped Bragg Grating on Microstructured PMMA Fiber. Journal of Lightwave Technology. 2018; 36 (20):4723-4729.
Chicago/Turabian StyleSanzhar Korganbayev; Rui Min; Madina Jelbuldina; Xuehao Hu; Christophe Caucheteur; Ole Bang; Beatriz Ortega; Carlos Marques; Daniele Tosi; Min Rui. 2018. "Thermal Profile Detection Through High-Sensitivity Fiber Optic Chirped Bragg Grating on Microstructured PMMA Fiber." Journal of Lightwave Technology 36, no. 20: 4723-4729.
We demonstrate the Bragg gratings inscription in the 850-nm spectral region by using trans-4-stilbenemethanol-doped poly methyl methacrylate step-index optical fiber and a 248-nm krypton fluoride (KrF) excimer laser system. The gratings inscription only takes 0.4 s. A detailed study of the grating fabrication process using different pulse repetition rates is also reported. In addition, temperature, humidity, and strain sensitivities are measured to demonstrate the potentiality of these components for different sensing applications.
Rui Min; Beatriz Ortega; Xuehao Hu; Christian Broadway; Christophe Caucheteur; Chi-Fung Jeff Pun; Hwa-Yaw Tam; Paulo Antunes; Carlos Marques. Bragg Gratings Inscription in TS-Doped PMMA POF by Using 248-nm KrF Pulses. IEEE Photonics Technology Letters 2018, 30, 1609 -1612.
AMA StyleRui Min, Beatriz Ortega, Xuehao Hu, Christian Broadway, Christophe Caucheteur, Chi-Fung Jeff Pun, Hwa-Yaw Tam, Paulo Antunes, Carlos Marques. Bragg Gratings Inscription in TS-Doped PMMA POF by Using 248-nm KrF Pulses. IEEE Photonics Technology Letters. 2018; 30 (18):1609-1612.
Chicago/Turabian StyleRui Min; Beatriz Ortega; Xuehao Hu; Christian Broadway; Christophe Caucheteur; Chi-Fung Jeff Pun; Hwa-Yaw Tam; Paulo Antunes; Carlos Marques. 2018. "Bragg Gratings Inscription in TS-Doped PMMA POF by Using 248-nm KrF Pulses." IEEE Photonics Technology Letters 30, no. 18: 1609-1612.
We experimentally demonstrate the first polymer optical fiber Bragg gratings inscribed with only one Nd:YAG laser (266 nm) pulse. The gratings have been inscribed in a single-mode poly (methyl methacrylate) optical fiber, with a core doped with benzyl dimethyl ketal for photosensitivity enhancement. One laser pulse with a duration of 8 ns and energy of 72 µJ is adequate to introduce a refractive index change of 0.5 × 10−4 in the fiber core. The stability of the gratings has been confirmed and the strain and temperature sensitivity measurements demonstrate their tunable properties.
Luis Pereira; Rui Min; Xuehao Hu; Christophe Caucheteur; Ole Bang; Beatriz Ortega; Carlos Marques; Paulo Antunes; Joao L. Pinto. Polymer optical fiber Bragg grating inscription with a single Nd:YAG laser pulse. Optics Express 2018, 26, 18096 -18104.
AMA StyleLuis Pereira, Rui Min, Xuehao Hu, Christophe Caucheteur, Ole Bang, Beatriz Ortega, Carlos Marques, Paulo Antunes, Joao L. Pinto. Polymer optical fiber Bragg grating inscription with a single Nd:YAG laser pulse. Optics Express. 2018; 26 (14):18096-18104.
Chicago/Turabian StyleLuis Pereira; Rui Min; Xuehao Hu; Christophe Caucheteur; Ole Bang; Beatriz Ortega; Carlos Marques; Paulo Antunes; Joao L. Pinto. 2018. "Polymer optical fiber Bragg grating inscription with a single Nd:YAG laser pulse." Optics Express 26, no. 14: 18096-18104.
We demonstrate Bragg grating inscription in commercial CYTOP POF at a wavelength of 600 nm using a 248 nm krypton fluoride (KrF) excimer laser system with a repetition rate of 40 Hz and average pulse energy of 0.60-0.02 mJ during 60 min. Experimental characterization of the Bragg grating is performed under different conditions, where the temperature and strain sensitivities were accurately measured to define potential sensing and optical communication applications. Furthermore, different humidity conditions were experimentally tested and it was proved CYTOP POF as a good candidate for sensing applications under humidity change environment.
Rui Min; Beatriz Ortega; Arnaldo Leal-Junior; Carlos Marques. Fabrication and Characterization of Bragg Grating in CYTOP POF at 600-nm Wavelength. IEEE Sensors Letters 2018, 2, 1 -4.
AMA StyleRui Min, Beatriz Ortega, Arnaldo Leal-Junior, Carlos Marques. Fabrication and Characterization of Bragg Grating in CYTOP POF at 600-nm Wavelength. IEEE Sensors Letters. 2018; 2 (3):1-4.
Chicago/Turabian StyleRui Min; Beatriz Ortega; Arnaldo Leal-Junior; Carlos Marques. 2018. "Fabrication and Characterization of Bragg Grating in CYTOP POF at 600-nm Wavelength." IEEE Sensors Letters 2, no. 3: 1-4.
This paper presents a dynamic mechanical analysis (DMA) of a microstructured polymer optical fiber (mPOF). The fiber material is polymethyl methacrylate (PMMA), which is widely available commercially. The DMA is made by means of sequential strain cycles produced with an oscillatory load with controlled frequency to obtain the variation of the Young’s Modulus with respect to temperature, frequency and humidity for mPOFs with 2, 3 and 5-ring hexagonal microstructured cladding. Results show that the 3 different cladding structures have similar Young’s modulus on the stress-strain tests performed. Furthermore, the 3-ring structure presents the lowest Young’s Modulus variation with temperature among the samples tested, whereas the 5-ring structure presents a Young’s Modulus variation with frequency 25% lower than the 2 and 3-rings cladding structures. Regarding the humidity sensitivity, the 2-ring structure presented a 30% lower Young’s Modulus variation for a 25% humidity increase. The results obtained provide guidelines for the cladding structure choice for strain or stress sensors applications when low cross-sensitivity with temperature, humidity and frequency is desired.
Arnaldo G. Leal-Junior; Anselmo Frizera; Rui Min; Maria Jose Pontes; Andrea Fasano; Getinet Taffesse Woyessa; Ole Bang; Carlos Marques. Influence of the Cladding Structure in PMMA mPOFs Mechanical Properties for Strain Sensors Applications. IEEE Sensors Journal 2018, 18, 5805 -5811.
AMA StyleArnaldo G. Leal-Junior, Anselmo Frizera, Rui Min, Maria Jose Pontes, Andrea Fasano, Getinet Taffesse Woyessa, Ole Bang, Carlos Marques. Influence of the Cladding Structure in PMMA mPOFs Mechanical Properties for Strain Sensors Applications. IEEE Sensors Journal. 2018; 18 (14):5805-5811.
Chicago/Turabian StyleArnaldo G. Leal-Junior; Anselmo Frizera; Rui Min; Maria Jose Pontes; Andrea Fasano; Getinet Taffesse Woyessa; Ole Bang; Carlos Marques. 2018. "Influence of the Cladding Structure in PMMA mPOFs Mechanical Properties for Strain Sensors Applications." IEEE Sensors Journal 18, no. 14: 5805-5811.