基于倏逝波的锥形光纤马赫-曾德尔湿度传感器

发布时间：2018-04-07 15:13

  本文选题：湿度传感　切入点：锥形光纤　出处：《应用光学》2017年01期

【摘要】：提出了一种基于倏逝波原理的光纤马赫-曾德尔湿度传感器,传感器是在2个单模光纤粗锥的传感臂中心通过绝热火焰熔融拉锥处理而成。光由传感器输入端传入,经过第1个粗锥时,将激发出若干高阶模,各模式光传输经过细锥区进入第2个粗锥时被耦合进入传感器输出端。当外界湿度变化时,细锥区倏逝场随之变化,最终导致透射谱能量变化。通过测量透射谱能量变化,可以实现环境湿度传感测量。实验结果表明,在35%~85%RH的湿度变化范围内,透射谱的能量具有相同变化趋势,处于水蒸气吸收峰附近的干涉谷湿度响应灵敏度可达0.157dBm/%RH,温度交叉灵敏度仅为0.014%RH/℃。该传感器因其制作简单、灵敏度高,温度交叉敏感小等特点,具有很好的应用前景。
[Abstract]:An optical fiber Mach-Zehnder humidity sensor based on evanescent wave principle is proposed.When the light passes through the first coarse cone, it excites a number of higher-order modes. The light transmission of each mode is coupled to the output of the sensor when it passes through the thin cone into the second coarse cone.When the external humidity changes, the evanescent field in the fine cone region changes, which leads to the change of transmission spectrum energy.Environmental humidity sensing can be realized by measuring the energy change of transmission spectrum.The experimental results show that in the range of humidity variation of 35%~85%RH, the energy of transmission spectrum has the same changing trend. The humidity response sensitivity of the interference valley near the water vapor absorption peak can reach 0.157 dBm / r and the cross-sensitivity of temperature is only 0.014%RH/ 鈩，

本文编号：1719724