## FMS(Frequency modulation spectroscopy)

 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.

주파수 변조 분광학 연구(논문)

Frequency modulation (FM) spectroscopy

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