Dual-channel Fourier spectrograph and detection method
A dual-channel, spectrometer technology, applied in the field of spectral detection, can solve the problems of restored spectrum error, large error of restored spectrum, inaccuracy, etc., and achieve the effect of improving signal-to-noise ratio and eliminating influence
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[0038] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0039] When the light intensity of the detection target changes frequently (such as detecting aircraft tail flames, polluting gases in the atmosphere, etc.), using the existing time-modulated Fourier spectrometer for detection cannot effectively eliminate the background intensity, resulting in a large error in the restoration of the spectrum. The invention adopts a dual-channel time modulation structure, which can effectively extract the background light intensity information which changes with time, and eliminate it, so as to improve the accuracy of the restored spectrum.
[0040] A dual-channel Fourier spectrometer, comprising a collimating objective lens 1, a dual-channel interferometer 2, a first detection module 3, a second detection module 4, and a data processing system 5 placed in sequence along the optical path direction, such as figure 1 shown. ...
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