物理实验

采用光纤通信常用器件搭建MZI干涉仪温度测量系统，引入涂覆层与套管的放大系数B，系统具有高灵敏度，且可通过光纤长度调节．实验表明：工作在40～60℃时，示波器脉冲数和频率与温度变化量成正比(6.68℃^-1,6.63Hz/℃)；低温、高温区段(0～20℃，80～100℃)仍保持良好的线性关系；采用聚酰亚胺等耐高温涂层可改善高温区B值波动．本研究内容为温度变化测量提供了简易方案，可丰富光纤传感的教学内容．

The paper constructs a temperature measurement system based on a Mach-Zehnder interferometer(MZI)using commonly used devices in optical fiber communication.Introducing the amplification factor B of the coating and sleeve,the system features high sensitivity,which can be adjusted by varying the fiber length.Experiments show that when operating at 40～60°C the number of“pulses” displayed on the oscilloscope is proportional to temperature variation(6.68 pulses/°C),and the frequency is proportional to the rate of change(6.63 Hz/°C).A good linear relationship is maintained even in high and low temperature ranges(0～20°C,80～100°C).In addition,it is suggested that the use of high-temperature-resistant coatings such as polyimide can improve the fluctuation of B value at high-temperature ranges.This work provides a simple solution for temperature variation measurement and supports for enrichment of teaching content of optical fiber sensors.