Optical wavelength modulated long-path gas monitoring apparatus
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United States of America Patent
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Aug 16, 1994
Issued Date -
N/A
app pub date -
Mar 31, 1993
filing date -
Jul 18, 1990
priority date (Note) -
Expired
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Abstract
Optical long-path gas monitoring apparatus (2) comprising means (4) for providing a radiation beam, a modulator (10) for modulating the wavelength of the radiation beam such as to produce amplitude modulation of the beam in the presence of the gas being monitored, a radiation detector (12) for conversion of the radiation beam into an electrical signal, and a signal processor (PSD 1,PSD 2) for demodulating the electrical signal to provide a signal dependent upon the gas.
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