Effect of IDT position parameters on SAW yarn tension sensor sensitivity

Abstract

In this paper, the effect of the interdigital transducer (IDT) position parameters on the surface acoustic wave (SAW) yarn tension sensor sensitivity is investigated. The stress–strain characteristic of substrate was studied by the combination of finite element simulation and regression analysis method. According to this characteristic, the function relationship between the SAW yarn tension sensor sensitivity and the IDT position parameters was built using the regression analysis method. The monotonicity of the regression function was also given. On this basis, a novel sensitivity optimal scheme was proposed and solved by the quadratic programming method. Its solution demonstrates that the optimum sensitivity can be obtained when the IDT is 8.9 mm to the left side of the substrate and the IDT is 0.3 mm to the top edge of the substrate within a domain of the IDT position parameters. The SAW yarn tension sensor with corresponding IDT position parameters was fabricated to validate the correctness of the sensitivity optimal scheme. The measured results indicate that the SAW yarn tension sensor sensitivity can reach 813.69 Hz/g, which confirms that the novel scheme is effective.

Research on nonlinear compensation scheme of yarn tension sensor using SAW devices based on SSA–SVR model

“…The other part is the output frequency shift ∆f caused by the yarn tension. Thus, the output frequency f can be expressed as [15]:…”

Sensitivity Optimization of Surface Acoustic Wave Yarn Tension Sensor Based on Elastic Beam Theory

“…As can be seen from Figure 2 , the yarn tension F loaded on the piezoelectric substrate causes bending deformation of the piezoelectric substrate. The change in the yarn tension F causes a change in the interdigital electrodes spacing, as well as in the propagation speed of the SAW [ 16 ]. From Equation (1), the output frequency of the SAW oscillation varies with the yarn tension, F .…”

“…As for the SAW yarn tension sensor, the position of the IDTs on the upper surface of the piezoelectric substrate directly affects the sensitivity of the sensor [ 16 , 22 ]. From Equation (6), it is obvious that the sensitivity of the SAW yarn tension sensor has a linear relationship with the strain of the piezoelectric substrate (IDTs placed part), under the same yarn tension.…”

“…Significantly, with the rapid development of SAW [ 5 , 6 , 7 , 8 , 9 , 10 ] devices, SAW sensors [ 11 , 12 , 13 ] are being used in a wide range of industries. Furthermore, the SAW yarn tension sensor studied in [ 14 , 15 , 16 , 17 , 18 , 19 ] is a good selection to adapt to today’s textile manufacturing; it has excellent characteristics, such as high stability, high sensitivity, fast response speed, strong anti-interference ability, small size, low cost, and so on [ 20 ].…”

Grooving and Absorption on Substrates to Reduce the Bulk Acoustic Wave for Surface Acoustic Wave Micro-Force Sensors

“…To develop a high-precision SAW force sensor, the design of input and output interdigital transducers (IDTs) is critical. Xiaozhou Lü et al [8,9] used evenly distributed fingers to design input and output IDTs, but this kind of design method can cause the input IDT to produce a second-order effect [10][11][12], which will increase the sidelobes of the SAW sensor, thus seriously affecting the measuring accuracy of it. When the input transducer excites the SAW signal, it also excites the BAW signal [13], and the BAW signal will reflect on the substrate surface and then reach the output transducer.…”