Schreiber J, Blumenstock T, Fischer H
Appl Opt. 1996 Nov 1;35(31):6203-9. doi: 10.1364/AO.35.006203.
Up to now the effect of the modulated thermal self-emission of Fourier-transform spectrometers has been investigated for emission measurements only. But this instrumental radiation also influences Fourier-transform absorption spectroscopy in the mid-IR when the Moon, a hot blackbody, or even the Sun is taken as a radiation source, e.g., by causing small negative radiance values in the center of saturated absorption lines. For our experimental investigations, a blackbody that can be cooled down to liquid-nitrogen temperature was constructed. Measurements at different temperatures of the blackbody and for different optical configurations in the detector port of the Fourier spectrometer as well as transmission measurements of gas cells are used to examine the statements above.
到目前为止，傅里叶变换光谱仪调制热自发射的影响仅在发射测量中得到研究。但是，当以月球、热黑体甚至太阳作为辐射源时，这种仪器辐射也会影响中红外傅里叶变换吸收光谱，例如，它会在饱和吸收线中心产生小的负辐射值。为了我们的实验研究，构建了一个可冷却至液氮温度的黑体。利用黑体在不同温度下的测量、傅里叶光谱仪探测器端口不同光学配置下的测量以及气室的透射测量来检验上述说法。
