The SAW (surface acoustic wave) gyroscopic effect is a key parameter that reflects the sensitivity performance of SAW angular velocity sensors. This study found that adding a layer of non-piezoelectric material with a lower reflection coefficient than that of the upper-layer material below the piezoelectric substrate to form a double-layer structure significantly enhanced the SAW gyroscopic effect, and the smaller the reflection coefficient of the lower-layer material, the stronger the SAW gyroscopic effect, with values being reached that were two to three times those with single-layer substrate structures. This was confirmed using a three-dimensional model, and the experimental results also showed that the thickness of the piezoelectric layer and the type of the lower-layer material also had a significant impact on the SAW gyroscopic effect. This novel discovery will pave the way for the future development of SAW angular velocity sensors.

A surface acoustic wave (SAW) gyroscope has many unique advantages, but a low detection sensitivity limits its development. Previous studies have shown that adding a metal dot array to the acoustic wave propagation path of the SAW delay line can enhance the Coriolis force and further improve sensitivity. Therefore, in order to optimize the detection sensitivity performance of the sensor, 128°YX-LiNbO₃, ST-X Quartz and X112°Y-LiTaO₃ piezoelectric substrates were selected by finite element method to analyze the influence of the metal dot array size on the SAW gyroscopic effect in this paper. The most suitable metal dot size for 128°YX-LiNbO₃ and X112°Y-LiTaO₃ obtained by simulation are $5/16\lambda$ and $1/16\lambda$, respectively; for example, when the normalized angular velocity is 1 × 10⁻³, the SAW gyroscopic effect factor $g$ of the two piezoelectric substrates distributing the optimum size metal dots can reach 22.4 kHz and 5.2 kHz. For ST-X quartz, there is a threshold between the rotation speed of the substrate and the optimum size of the metal dot. When the rotating speed is lower than the threshold, the SAW gyroscopic effect is strongest when the metal dot size is $3/16\lambda$; otherwise, the SAW gyroscopic effect is strongest when the size is $11/16\lambda$. These research results provide new ideas for improvement of the SAW gyroscope.

Sensor technology, communication technology, and computer technology are the three pillars of information science and technology. The content of the sensor course is complex and involves a wide range of knowledge, which leads to students confused and not knowing how to apply the knowledge. The deep integration of professional education with innovation and entrepreneurship education attracts extensive attention. It solves the application problem of professional expertise and can cultivate students' interdisciplinary thinking and train comprehensive talents for society. This paper mainly studies the Sensor curriculum teaching methods based on the concept of innovation and entrepreneurship and the Project-Based Learning (PBL) method to cultivate students' comprehensive literacy.

Experimental teaching is one of the key contents of engineering education and it is also a powerful means to cultivate the research quality of undergraduate students. It enables students to gradually learn and master the ability to solve complex engineering problems, thereby meeting the requirements of engineering education. This paper analyzes the current situation and existing problems of experimental teaching in the "Sensor and Detection Technology" course. Combining with the concept of engineering education, this paper proposes the direction of reform and innovation form the aspects of improving teaching mode, enriching experimental content, optimizing teaching methods, and forms an effective mechanism for continuous improvement.