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本文介绍一种不需要机械加工,可自己动手制作,成本费约20～40元的压电传感器。 该传感器制作成全面积压缩型圆饼状结构。利用压电晶体纵向正压电效应,把岩土动应力转化成电荷量的变化。 这种传感器从结构上分析,具有以下特点:(1)结构简单成本低廉。成本主要由晶体片决定,约是金属壳体传感器价格的十分之一;(2)测量应力下限宽。环氧粘结剂在液态时浇灌成形,不存在接触间隙和接触误差,鉴别阈可降
This article describes a do not need machining, can do it yourself, the cost of about 20 to 40 yuan piezoelectric sensor. The sensor is made into a full-area compressed pancake structure. The use of piezoelectric piezoelectric longitudinal piezoelectric effect, the dynamic stress into geochemical changes in charge. This sensor from the structural analysis, has the following characteristics: (1) simple structure and low cost. The cost is mainly determined by the crystal piece, which is about one-tenth of the price of the metal shell sensor; (2) The measurement of the lower limit of stress. Epoxy adhesives are water-formed in the liquid state, without contact gaps and contact errors, and discrimination thresholds can be reduced