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采用相对灵敏度为3.61×10-6cm-1Hz-1/2的QCL气体检测系统对室温下的甲醛气体进行了吸收光谱的测试,采用F-P标准具对系统进行相对频率校准,根据此波段甲烷的吸收谱线对甲醛吸收光谱进行绝对频率校准.当调谐QCL工作温度为-15℃~20℃,以每5℃变化时,采集并处理相应的频率调谐光谱.采用He,Ne,Kr,O2和CO2作为本波段的非吸收性缓冲气体作用于甲醛,通过计算光谱数据得出1 253.143 92 cm-1处甲醛的吸收线强度.给出了N2中的展宽光谱以及相应的光谱数据处理残差结果,并对结果进行了分析.
Absorbance spectrum of formaldehyde gas at room temperature was measured by using QCL gas detection system with relative sensitivity of 3.61 × 10-6cm-1Hz-1/2. The relative standard frequency of the system was calibrated with FP etalon. According to the absorption of methane in this band, Spectra were used to perform an absolute frequency calibration of the absorption spectrum of formaldehyde, and the corresponding frequency-tuning spectra were acquired and processed when the tuning QCL operating temperature was -15 ° C to 20 ° C at every 5 ° C. He, Ne, Kr, O2 and CO2 As the non-absorbing buffer gas in this band, the intensity of the absorption line at 1 253.143 92 cm-1 was obtained by calculating the spectral data.The broadening spectrum in N2 and the corresponding spectral data processing residual results were given, The results were analyzed.