Modulation techniques make use of the fact that technical noise usually decreases with increasing frequency (often referred to as a 1/f noise) and improves on the signal contrast by encoding and detecting the absorption signal at a high frequency, where the noise level is low. The most common modulation techniques, wavelength modulation spectroscopy (WMS)[2] and frequency modulation spectroscopy (FMS),[3] achieve this by rapidly scanning the frequency of the light across the absorbing transition.

[링크 : https://en.wikipedia.org/wiki/Laser_absorption_spectrometry]

 

주파수 변조 분광학 연구(논문)

[링크 : http://koreascience.or.kr/article/CFKO199111919763456.pdf]

 

Frequency modulation (FM) spectroscopy

[링크 : https://link.springer.com/article/10.1007/BF00688820]

 

[링크 : https://dynamics.eps.hw.ac.uk/Frequency_Modulated_Spectroscopy.php]

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