高灵敏度SAW纱线张力传感器研究

Research on high-sensitivity SAW yarn tension sensor

灵敏度是声表面波(SAW)纱线张力传感器成功检测纱线张力的关键。通过对SAW纱线张力传感器的灵敏度和基片应变率之间关系的研究,提出了通过增加基片应变率来提高传感器灵敏度的理论。以该理论为指导,给出了通过灵活设计基片尺寸来获得最佳基片应变率的设计方案。为了得到最佳基片应变率对应的基片尺寸,建立了基片应变率和基片尺寸之间的数学模型,提出了求解最大基片应变率所对应基片尺寸的线性规划模型,即最佳灵敏度所对应基片尺寸。实验表明:该方法可以有效提高SAW纱线张力传感器的灵敏度,灵敏度达3 132.4 Hz/gf。

Sensitivity is the key in process of successful detection on yarn tension using SAW yarn tension sensor. By studying relationship between sensitivity of SAW yarn tension sensor and substrate strain rate of SAW yarn tension sensor, propose a theory, which can improve sensor sensitivity through increasing shbstrate strain rate. Based on the theory, a scheme is given to obtain the optimal substrate strain rate through flexibly design substrate size. In order to obtain substrate size corresponding to the optimal substrate strain rate, mathematical model between substrate strain rate and substrate size is established; a linear programming model is proposed to solve the substrate size corresponding to the maximum substrate strain rate, that is the substrate size corresponding to the optimal sensitivity. Experimental results confirm that the method can significantly increase SAW yarn tension sensor sensitivity up to 3 132.4 Hz/gf.