Diaphragm-Type Pressure Sensor with Cu-Ni Thin Film Strain Gauges-II : Design Fabrication and Characteristics of a Pressure Sensor

Cu-Ni 박막 스트레인 게이지를 이용한 다이어프램식 압력 센서-II:압력 센서의 설계 제작의 특성

In this paper we present the construction details and output characteristics of a diaphragm-type pressure sensor with Cu-Ni(53:47) thin-film strain gauges. In order to improve the sensitivity and the temperature compensation two circumferential gauges are placed near the center of the diaphragm and two radial gauges are located near the edge. For all the gauges the relative change in resistance ΔR/R with pressure is of the order 10$^{-3}$ for the maximum pressure. The output is found to be linear over the entire pressure range(0-30kfg/cm$^2$)and the output sensitivity obtained is 1.6mV/V. The maximum nonlinearity observed in output characteristics is 0.35%FS for 5V excitation and the hysteresis is less than 0.1%FS.