Self-cleaning optical sensor

Details Self-cleaning optical sensor Self-cleaning optical sensor

2008-05-20

2008-05-20

Lee, John R (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C250S554000

Reexamination Certificate

active

07375314

ABSTRACT:
The invention relates to an optical sensor for detecting light emission in combustion processes in a combustion chamber. At least one lens of the sensor faces the combustion chamber and is disposed on the tip of the sensor. The inventive sensor is provided with a heating device, which is disposed on the tip thereof, in the region of the front lens. The heating device can be a wire coil, a laser or a conduit with heated fluid. The sensor can include a controller for controlling the temperature of the heating device so that the tip of the sensor can be heated by the heating device to a specific temperature at which any soot on the front lens is combusted. As a result, the sensor remains clean and operational during the entire measuring period as desired.

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PCT International Search Report, PCT/CH2004/000142, May 25, 2004.
Patent Abstracts of Japan, vol. 009, No. 141 (P-364), Jun. 15, 1985, JP 60 022116 A.

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