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利用可调谐半导体激光吸收光谱技术(TDLAS)并结合波长调制,在近红外波段1531.7nm处对常温常压下的NH3进行浓度测量.在10m的长程吸收池内得到了25×10-6的浓度信号,并且在25×10-6—400×10-6浓度范围内二次谐波信号与浓度具有良好的线性关系.讨论了粉尘颗粒对于二次谐波信号的干扰,并提出了利用激光强度线性拟合解决颗粒对气体测量干扰的方法.
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关键词:
- 可调谐半导体吸收光谱 /
- 波长调制 /
- NH3浓度测量 /
- 颗粒影响
Tunable diode laser absorption spectroscopy (TDLAS) with wavelength modulation is used to measure the NH3 concentration at normal temperature and pressure near 1531.7nm in near-infrared region. The concentration of 25ppm can be obtained by 10m long-path cell,and concentration from 25ppm to 400ppm has good linear relationship with 2f signal. The effect of particles on 2f signal is discussed in this paper,and a solution of the problem using laser intensity linear fit to make the concentration measurement immune to particle disturbance is suggested.-
Keywords:
- TDLAS /
- wavelength modulation /
- NH3 concentration measurement /
- particle effect
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