Phaseless wavelength modulation spectroscopy

Details Phaseless wavelength modulation spectroscopy Phaseless wavelength modulation spectroscopy

1998-01-09

1999-10-26

Kim, Robert H.

Optics: measuring and testing

By particle light scattering

With photocell detection

356345, G01B 902

Patent

active

059737824

ABSTRACT:
An improvement to wavelength modulation spectroscopy systems operating at frequency .OMEGA. and having a photodetector generating output with frequency components .OMEGA., 2.OMEGA., . . . n.OMEGA., where n is an integer greater than one, the improvement comprising a demodulator operating at frequency .OMEGA.+.delta., where .OMEGA.>>.delta., and additionally recovering signals at n.OMEGA.+n.delta.. The system provides information on multiple detection harmonics simultaneously, no phase adjustment is needed, and the system uses a heterodyne demodulation with its inherent low-noise advantage.

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patent: 5491344 (1996-02-01), Kenny et al.
patent: 5528040 (1996-06-01), Lehmann
patent: 5572031 (1996-11-01), Cooper et al.

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