静水压力变化对NTC热敏电阻器电学特性影响

负温度系数(negative temperature coefficient,NTC)热敏电阻器由于在窄温区内具有极高的灵敏度,在海洋领域中有着广泛的应用,但深海应用中固有的高静水压力,对器件的测温准确度造成不利影响。为了更好地认识这种现象,以珠状NTC热敏电阻器为研究对象,利用海洋环境高压模拟装置,开展了静水压力作用对器件电学特性影响的研究,固定环境温度25℃和0℃,压力范围0~60 MPa,步长5 MPa。结果显示,随着静水压力的增大,NTC热敏电阻器的电阻值减小;环境温度25℃和0℃时,5~60 MPa的静水压力造成的漂移分别为-0.11%~-2.81%、-0.19%~-2.78%,等效于温度漂移分别为0.024~0.624℃、0.036~0.535℃。这为热敏电阻器在深海温度准确测量的提升提供了指引,有利于在海洋测温领域中更好的应用。

EFFECT OF HYDROSTATIC PRESSURE VARIATION ON THE ELECTRICAL CHARACTERISTIC OF NTC THERMISTORS

Negative temperature coefficient (NTC) thermistors are widely used in the ocean field due to their extreme sensitivity in a small temperature range. However, high hydrostatic pressure in abyssal ocean is detrimental to the accuracy of temperature measurement of the device. We designed a device to simulate highpressure environment of ocean, with which the effect of hydrostatic pressure on the electrical characteristics of bead NTC thermistor was studied under ambient conditions of 25 °C and 0 °C in 5 MPa pressure interval in range of 0~60 MPa. The results show that the resistance value of NTC thermistor decreases with the increase of hydrostatic pressure, the drifts caused by hydrostatic pressures in range of 5~60 MPa was -0.11%~ -2.81%, -0.19%~ -2.78% at 25 °C and 0 °C, respectively, being equivalent to a temperature drift of 0.024~0.624 °C and 0.036~0.535 °C, respectively. This study provides guidance for improving the accuracy of temperature measurement in abyssal ocean and facilitates the application of NTC thermistor in the field of ocean temperature measurement.