Gaseous species absorption monitor

Details Gaseous species absorption monitor Gaseous species absorption monitor

1989-09-20

1991-06-25

Hannaher, Constantine

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250339, 250341, 356317, G01N 2117, G01N 2159

Patent

active

050269917

ABSTRACT:
A wavelength-locked laser gaseous species monitor including a variable wavelength laser with a laser output actively stabilized to a wavelength at or near an absorption wavelength of the species being monitored. The laser is modulated about that wavelength to establish a modulated output with a known frequency and bandwidth. The modulated output is passed through the sample being monitored and then collected. An even harmonic of the collected output with respect to the modulation frequency is determined, and the presence in the sample of the species being monitored is detected from the even harmonic signal.

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patent: 4410273 (1983-10-01), Mantz et al.
patent: 4674091 (1987-06-01), Colson
patent: 4730112 (1988-03-01), Wong
Kemeny et al., "Utilization of Tunable Infrared Diode Lasers for the Determination of Labelled Molecules in Gas Mixtures", Acta Physica Academiae Scientiarum Hungaricae, Tomus (vol.) 48, (No.) 1, (1980), pp. 93-102.

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