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采用中心波长位于2.3μm的半导体激光器,结合扫描波长直接吸收法,对高温条件不同工况下的CO气体谱线吸收特性进行了测量,分别研究了压力和温度对谱线线宽和吸收线强的影响.结果表明:随着压力的提高,谱线宽度逐渐增加,选择的激光器需要有足够宽度的扫描范围,R(30)谱线高压下独立性好,不与周围干扰谱线发生叠加,是理想的CO测量吸收谱线;通过消除背景信号的方法可减少颗粒对谱线吸收测量精度的影响;所选波段的谱线在高温时(>1 000K)有足够的线强,可以得到直接吸收(DA)信号,避免了采用调制技术带来的复杂性,为研究各种因素的影响提供了便利.
Using the semiconductor laser with central wavelength of 2.3μm and the direct absorption method of scanning wavelength, the gas absorption characteristics of CO gas under different working conditions were measured. The effects of pressure and temperature on the spectral linewidth and absorption line intensity The results show that the width of the spectrum increases with the increase of the pressure, and the selected laser needs to have a wide scanning range. The R (30) line has good independence under high pressure and does not overlap with the surrounding interference lines. Is the ideal CO measurement absorption line; by eliminating the background signal method can reduce the particles on the spectral absorption measurement accuracy; the selected band spectrum at high temperatures (> 1000K) sufficient line strength, you can get direct Absorption (DA) signal, to avoid the complexity of using modulation techniques, to facilitate the study of the impact of various factors.