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The noise properties of two multi-heterodyne spectrometers based on multi-mode semiconductor lasers (QCLs and ICLs) are investigated to determine their detection performance limitations. Both laser technologies provide well-defined multi-heterodyne beat-note structures suitable for spectroscopic measurements.
According to the characteristic that the resonant frequency of the resonant cavity shifts with the change of the air permittivity, this paper presents the frequency measurement system based on the microwave cavity wetness measurement system and realizes the accurate measurement of the steam wetness. A new method of frequency measurement is introduced, which is the combination of multi-cycle synchronization...
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