基于光纤珐珀结构的耐高温应变传感器研究

Research on High-Temperature Resistant Strain Sensor Based on Fiber-Optic Fabry-Perot Structure

为了研制一种适用于反应堆一回路高温环境下机械测量的微型应变传感器,基于光纤珐珀(FP)结构光学原理、解调原理和封装技术研究,提出传感器的热机耦合模型,设计出一种基于光纤FP结构的耐高温应变传感器及其解调系统,并对其在常温空气中和高温中压水环境中进行动态测试。研究和测试结果表明,该高温光纤FP应变传感器及其解调系统能够在高温、中压以及水环境下稳定工作,且应变传感器的测量工作范围为0~4000με,解调系统速度达到5 kHz。本研究设计的高温光纤FP应变传感器及其解调系统能够用于反应堆一回路高温环境下的应变测量,从而为反应堆一回路高温环境下的监测提供了一种有效的监测方法。

In order to develop a micro strain sensor suitable for mechanical measurement in the high temperature environment of the reactor first loop,based on the principle of optics,demodulation principle and packaging technology of the fiber-optic Fabry-Perot(FP)structure,the thermal-mechanical coupling model of the sensor is proposed,a high temperature resistant strain sensor based on the fiber-optic FP structure and its demodulating system are designed,and its dynamic test is carried out in the normal temperature air,high temperature and medium pressure water environment.The research and test results show that the high temperature strain resistant fiber optic strain sensor and its demodulating system can operate stably in high temperature,medium pressure and water environment,and the measuring range of the strain sensor is 0~4000με,the accuracy is 0.125%FS,and the speed of the demodulating system is 5 kHz.The high temperature resistant strain fiber optic strain sensor and its demodulating system designed in this study can be used to measure the strain in the high temperature environment of the reactor first loop,thus providing an effective monitoring method for the monitoring in the high temperature environment of the reactor reactor first loop.