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为了从蓝宝石晶体高温传感器输出信号中精确解调出温度信息,建立了一套基于离散腔长变换(DGT)的解调系统。从白光偏振干涉原理出发,分析了高斯光源条件下利用DGT解调蓝宝石晶体高温传感器的原理。针对传统傅里叶变换解调数字频率非均匀采样存在误差的缺点,直接对波长均匀采样得到的光谱数据进行DGT,利用DGT幅值谱峰值解调环境温度引起的光程差(OPD)。进而采用加高斯窗法消除光谱仪背景噪声,进一步提高DGT方法的解调精度。在实际的解调系统中对所提出的方法进行了实验,结果表明,在600～1 200℃测温范围,本文方法可以实现温度的精确测量。
In order to accurately demodulate the temperature information from the output signal of the sapphire crystal high temperature sensor, a set of demodulation system based on discrete cavity length transform (DGT) was established. Based on the principle of white light polarization interference, the principle of using DGT to demodulate sapphire crystal high temperature sensor under Gaussian light source is analyzed. Aiming at the shortcomings of traditional Fourier transform demodulation in inhomogeneous digital frequency sampling, DGT is performed directly on the spectral data obtained by uniform wavelength sampling, and the optical path length difference (OPD) caused by the ambient temperature is demodulated by using DGT peak amplitude spectrum. Then Gaussian window method is adopted to eliminate the background noise of the spectrometer and further improve the demodulation accuracy of the DGT method. In the actual demodulation system, the proposed method has been tested. The results show that this method can measure the temperature accurately in the range of 600 ~ 1200 ℃.