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针对多层透射式光纤氢气(H_2)传感器其特殊的多层结构造成了类似于F-P腔效应的周期性光谱特性变化尚未可知问题,构建了一种适用于多层透射式探头的原位H_2敏光谱观测系统,通过实验研究了在不同H_2浓度下这种多层膜结构的光谱特性,讨论了光源波长变化对传感器测量稳定性的影响规律,为进一步提高传感器性能奠定了实验基础。实验结果表明,光源波长变化对传感器测量的可靠性有显著影响,但是通过扫描波长的方式测量可以有效避免这类H_2传感器的波长漂移问题,达到较高的测量可靠性。
Aiming at the problem that the periodic multi-layer transmission type optical fiber hydrogen (H 2) sensor has a multi-layered structure which is similar to the change of the periodic spectral characteristics of the FP cavity effect, a H_2-sensitive Spectral observation system was used to study the spectral characteristics of the multi-layer structure under different H 2 concentrations. The influence of the wavelength of the light source on the stability of the sensor was discussed, which laid the experimental foundation for further improving the performance of the sensor. The experimental results show that the wavelength variation of the light source has a significant influence on the reliability of the sensor measurement. However, the wavelength shift of the H_2 sensor can be effectively avoided by scanning the wavelength to achieve higher measurement reliability.