Frequency Modulation Multiplexing for Simultaneous Detection of Multiple Gases by use of Wavelength Modulation Spectroscopy with Diode Lasers
Applied Optics, Vol. 37, Issue 12, pp. 2499-2501 (1998)
http://dx.doi.org/10.1364/AO.37.002499
Acrobat PDF (137 KB)
Abstract
Modulation frequency multiplexing provides a straightforward method, analogous to television or radio broadcasting, for performing simultaneous detection of multiple gases by use of wavelength modulation spectroscopy with diode lasers. When fiber-optic coupled lasers are used, our approach guarantees that all beams transit the same optical path and impinge on the same detector. Each laser is modulated at a different frequency and the detector output is processed by a set of lock-in amplifiers, one for each laser, to measure the absorbance encountered by each laser.
© 1998 Optical Society of America
[Optical Society of America ]
OCIS Codes
(060.4230) Fiber optics and optical communications : Multiplexing
(130.6010) Integrated optics : Sensors
(140.2020) Lasers and laser optics : Diode lasers
(140.3480) Lasers and laser optics : Lasers, diode-pumped
(300.0300) Spectroscopy : Spectroscopy
(300.6380) Spectroscopy : Spectroscopy, modulation
Citation
Daniel B. Oh, Mark E. Paige, and David S. Bomse, "Frequency Modulation Multiplexing for Simultaneous Detection of Multiple Gases by use of Wavelength Modulation Spectroscopy with Diode Lasers," Appl. Opt. 37, 2499-2501 (1998)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-37-12-2499
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