Device for measuring gas concentration having dual emitter

Details Device for measuring gas concentration having dual emitter Device for measuring gas concentration having dual emitter

2006-04-25

2006-04-25

Le, Que T. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C250S222200

Reexamination Certificate

active

07034325

ABSTRACT:
A device for measuring the concentration of a gas contained in a cavity and for checking the operation of a catalytic element in an exhaust line in an automobile vehicle. A first emitter (E1) composed of an optical pumped micro-cavity and for which the emission spectrum is within the gas absorption band emits a first radiation that passes through the cavity. A second emitter emits a second radiation that passes through the cavity. A receptor measures the optical intensity (I) of the radiation that passed through the cavity.

REFERENCES:
patent: 5797682 (1998-08-01), Kert et al.
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Uehara et al, Remote Detection of Methane with a 1.66-μm diode laser, Feb. 20, 1992/ vol. 31, No. 6/ Applied Optics.
M.K. Perry et al, Efficient 3.3 μm light emitting diodes for detecting methane gas at room temperature, Electronics Letters, Nov. 1, 1994, vol. 3., No. 23.
W. Dobbelaere et al, InAsSb Light Emitting Diodes and Their Appl. To Infra-Red Gas Sensors.
Y. Mao et al, Efficient 4.2 μm Light Emitting Diodes for Detecting Co2at room temperature, Electronics Letters, Feb. 29, 1996, vol. 32 No. 5.
A. Krier et al, High Power 4.6 μm LEDs For CO detection Grown by LPE, Electronics Letters, Sep. 16, 1999, vol. 35 No. 19.

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