本文介绍已研制成功的光纤耦合温度计工作原理。该仪器的信号检测电路采用电阻-脉冲宽度调制方案,提供参考通道;用脉宽-位置脉冲转换电路实现微功耗设计;选用光纤做信号传输元件,使仪器具有高精度和强抗干扰能力,适用于易燃易爆和超高压等特殊场合温度参数检测。本仪器测试指标达到:测温范围:0～100℃,误差:<0.3℃,钮扣电池供电最短工作时间:大于10天。 This article describes the working principle of a fiber-coupled thermometer that has been developed. The signal detection circuit of the instrument adopts the resistance-pulse width modulation scheme to provide a reference channel; the pulse width-position pulse conversion circuit is used to realize the micropower design; the optical fiber is used as the signal transmission component to make the instrument have high precision and strong anti-interference ability, Suitable for flammable and ultra-high pressure and other special occasions temperature parameter testing. The instrument test indicators to achieve: Temperature range: 0 ~ 100 ℃, error: <0.3 ℃, the button battery-powered Minimum working time: more than 10 days.