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针对水升华器工作监测要求,基于Fabry-Perot干涉微腔研制了一种光纤声振动传感器。将耐低温聚合物薄膜材料以周边拉伸固定的方式制作成超薄膜片,膜片厚度为1.2μm,作为探测声振动信息的敏感部件和干涉微腔的反射面。传感器灵敏度达到93mV/Pa,线性度为99.8%,在1~20kHz范围内具有较平坦的频率响应。利用设计的光纤声振动传感器在空间环境模拟器中进行了水升华器监测实验,结果表明该传感器在温度为77K的空间冷黑环境中可以存活,能够实时探测到水升华器喷冰故障所产生的声振动信号。
According to the requirements of water sublimation work, a fiber optic acoustic vibration sensor was developed based on Fabry-Perot interference microcavity. The low temperature resistant polymer film material was stretched and fixed around the periphery to make an ultra-thin film with a thickness of 1.2 μm as a sensitive part for detecting acoustic vibration information and a reflection surface for interfering microcavities. The sensor has a sensitivity of 93mV / Pa and a linearity of 99.8% with a flatter frequency response in the 1 to 20kHz range. The designed optical fiber acoustic vibration sensor was used to monitor the water sublimate in the space environment simulator. The results show that the sensor can survive in cold black environment with a temperature of 77K, and can detect the ice submerged ice spray failure in real time Acoustic vibration signal.