amplitude modulation 

https://doi.org/10.1351/goldbook.08566
Modulation of the amplitude of a beam of electromagnetic radiation; by the movement of a moving mirror in a rapid scan Fourier-transform spectrometer or by a mechanical chopper in other spectrometers.
Source:
PAC, 2021, 93, 647. (Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)) on page 738 [Terms] [Paper]
Citation: 'amplitude modulation' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.08566 RIS BibTex EndNote
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