基于阵列波导光栅的边缘滤波温度解调系统

Edge filter temperature demodulation system based on arrayed wave-guide grating

为克服传统阵列波导光栅解调系统体积大、价格昂贵等问题,提出了以窄带光源为输入光源,采用边缘滤波和阵列波导光栅相结合的解调方案,实现对增敏封装后的光纤光栅温度传感器进行温度解调实验。以窄带光源作为输入,通过边缘滤波的方法使得温度传感器反射谱的中心波长偏移程度与解调光路输出光强的变化相对应,利用阵列波导光栅的波分复用实现多传感器同时测量,实现了多传感器多通道的分布式测量,实验结果表明:解调系统的波长解调范围为1545.30 nm~1560.50 nm,对35℃~42℃的温度范围进行检测,波长解调精度为±5.34 pm,温度测量误差可达±0.1℃。

In order to overcome the large size and high price of the traditional arrayed wave-guide grating demodulation system,a demodulation scheme using a narrow-band light source as the input light source and adopting a combination of edge filter and arrayed wave-guide grating was proposed to realize the temperature demodulation experiment of fiber grating temperature sensor after packaging.Using the narrow-band light source as input,the edge filter method made the central wavelength shift of temperature sensor reflection spectrum correspond to the change in the output light intensity of demodulation optical path.The wavelength division multiplexing of arrayed wave-guide grating was used to realize the simultaneous measurement of multiple sensors,and the distributed measurement with multi-sensor and multi-channel was performed.The experimental results show that the wavelength demodulation range of the demodulation system is 1545.30 nm~1560.50 nm,the temperature range of 35℃~42℃was detected,and the wavelength demodulation accuracy is±5.34 pm.The temperature measurement error can reach to±0.1℃.