基于波长调制光谱的多参数测量方法研究

基于扫描波长调制光谱技术,开发了一种同时测量气体压强、温度和组分浓度等多个参数的传感器.详细分析了利用谱线的4f_(peak)/2f_(peak)和2f/1f信号测量气体参数的迭代算法以及传感器的设计方案.采用频分复用方案,利用7 429.72 cm~(-1)和7 454.45 cm~(-1)两条H_2O谱线对温度分布在300~1 200 K范围内的静态气室进行了实验研究.实验结果表明迭代算法具有收敛速度快和测量精度高等优点,温度、压强和H_2O组分浓度的测量值与预测值基本符合,与预测值的最大相对偏差分别在4%、6%和6%以内.

Measurement of multi-parameters of gas based on the wavelength modulation spectroscopy

A sensor was proposed to measure temperature, concentration and pressure of the atmosphere based on scanning wavelength modulation spectroscopy. The method using 4fpeak/2fpeak and 2f/1f signals of H2O spectral lines was analyzed and the sensor design program was studied. Frequency division multiplexing technology is adopted to measure gas parameters of static cell in the temperature range of 300~1 200 K using the two H2O spectral lines (7 429.72 cm-1 and 7 454.45 cm-1). Experimental results show that the iterative algorithm has rapid convergence rate and high accuracy. The measured gas temperature, pressure and concentration of H2O are consistent with the predicted value with the largest relative errors 4%, 6% and 6%, respectively.