热敏电阻式体温计的研究

Study on Thermistor -type Thermometer

介绍一种以热敏电阻为基础的电子式体温计。该温度计由以下几部分组成:热敏电阻制成的测温探头,惠斯顿电桥、取样保持电路和一个微安表。温度的变化引起热敏电阻阻值的变化,从而使电桥失去平衡,引起流过微安表的电流发生变化。就利用这个电流的变化作为温度的量度。这种体温计的测温范凼为35～41℃,测温精度为0.1℃。还给出了该温度计的理论及部分实验结果。

A electronic thermometer based on a thermistor is presented. The meter consists of the following parts: a thermoprobe-head made of a thermistor, a wheastone bridge, a sample -and-hold circuit and a microammeter. A changed temperature lead to the change of value of the thermistor, then the bridge balance broke up, which induced the change of current value to the microammeter. Temperature is measured by the change of the current value. The range of the device is 35 - 41℃ , and the precision, o.1℃ . The theory and partial test results are also given.