Gas detector

Details Gas detector Gas detector

1974-06-03

1976-12-21

Corbin, John K.

Optics: measuring and testing

Inspection of flaws or impurities

Bore inspection

356178, 331 945C, G01N 2122, G01J 346

Patent

active

039985571

ABSTRACT:
Laser detector for gases employs two beams, one at wave length corresponding to an optical absorption resonance of the gas to be detected, 3.39 micron in the preferred methane detector, and another at a similar wave length, but lying outside of the effective absorption curve, with a balance circuit for detection. The embodiments show common beam path, common lasing medium and common power sources for generating the two beams. In one embodiment two resonant cavities share a common discharge tube and output mirror through switching, while in others the resonators are separate but sharing the same gas system or power supply. A suppression cell filled with methane is employed to suppress a dominant transition, to establish lasing at another transition, and adjustable length and adjustable pressure cells are also employed to enable balancing of the system prior to detection.

REFERENCES:
patent: 3492600 (1970-01-01), Zitter
patent: 3504977 (1970-04-01), Matthews
patent: 3609587 (1971-09-01), Kolb
patent: 3843258 (1974-10-01), Shupe
Helvig et al.; "Frequency Stability of Methane Stabilized He-Ne Lasers, " J. Appl. Phys., vol. 43, No. 2.

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