一种双通道小型荧光测温仪的设计与实现

Design and realization of a two-channel mini fluorescence thermometer

摘要:

荧光光纤温度传感器利用光纤技术的远距离传输，避开了恶劣的测温环境，相较传统有源测温设备的接触式测量，更适合在强电磁场、高压腐蚀等极端环境下的温度检测。针对传统的单通道电路读出结构易受外界干扰的弊端，本文设计了一种双通道的小型实用的荧光测温系统。整个测温系统分为光路设计、电路设计和程序设计3个部分。采用两路通道差分相减的创新思想，完全消除了直流分量且基本不含有随机噪声，从而得到了单一光滑的荧光衰减信号。最后通过标定实验，得到荧光寿命与温度之间的函数关系。实验结果表明，在10~130 ℃的温度范围内，标准温度偏差为0.5 ℃，基本满足强电磁场、高压腐蚀、微波热疗等一些恶劣环境下的测温需求。

Abstract:

Fluorescent optical fiber temperature sensor uses the long-distance transmission of optical fiber technology to avoid the harsh temperature measurement environment compared with the traditional active temperature measurement equipment in contact measurement. Aiming at the disadvantage that the traditional single channel circuit readout structure is vulnerable to external interference, a two-channel small and practical fluorescent temperature measuring device is realized. The whole system is divided into three parts:optical circuit design, circuit design and program design. The idea of two channel differential subtraction is adopted to completely eliminate the DC component and basically do not contain random noise, so as to obtain a single smooth fluorescence attenuation signal. And through the calibration experiment, the functional relationship between the fluorescence lifetime and the temperature is obtained. The experimental results show that the standard temperature deviation is 0.5 °C within the temperature range of 10 °C to 130 °C, basically meeting the temperature measurement requirements in some harsh environments such as high pressure corrosion and microwave medical.