Fiber-optic gas composition sensor for exhaust gases

Details Fiber-optic gas composition sensor for exhaust gases Fiber-optic gas composition sensor for exhaust gases

1998-05-29

1999-11-09

Dolinar, Andrew M.

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

123703, 73 2332, 422 91, 356318, F02D 4114, G01N 3074

Patent

active

059794232

ABSTRACT:
An on-board gas composition sensor is disclosed for monitoring oxygen content levels in the exhaust gas (24) of an internal combustion engine (4). The gas composition sensor includes a sensor body (20) mounted inan exhaust stream from an engine (4), with a fiber-optic cable (18) running from the sensor body (20) to a silicon chip (13) containing a sensor assembly(10). The sensor assembly (10) includes a light source (12), mounted on the chip (13), for generating excitation light. Also, a fiber-optic coupler (16), formed in the chip, operatively engages a second fiber-optic cable (15), mounted in a groove on the chip. The second cable (15) connects to a fluorescence detector (34) and an excitation detector (36). The two detectors produce output signals (35, 37) that are used by the electronic engine control (8) to adjust engine operation.

REFERENCES:
patent: 5490490 (1996-02-01), Weber et al.
patent: 5591407 (1997-01-01), Groger et al.
Distributed and Multiplexed Fiber Optic Sensors V, SPIE, vol. 2507, pp. 13-24, Nellen et al, Jun. 1995.
Formation of Bragg gratings in optical fibers by a transverse holographic method, Meltz et al, Optics Letters, Aug. 1, 1989, vol. 14, No. 15, pp. 823-825.
Fiber Optic Sensors, John Wiley & Sons, Inc., A Wiley-Interscience Publication, pp. 31-33.

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