Gas sensors

Details Gas sensors Gas sensors

2003-11-07

2009-02-10

Porta, David P (Department: 2884)

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

Reexamination Certificate

active

07488942

ABSTRACT:
A gas sensor of the type having a housing defining a chamber within which light is transmitted from a source to a detector through an optical path, includes internal mirror portions having part ellipsoidal shape. Light is transmitted from a source to a detector via the reflective portions. The detector is arranged to sense light only from a limited range of angles, such that only light transmitted through a defined optical path reflected off the two reflective portions from the source reaches the sensor. This ensures that there is a constant optical path from the source to the detector, which improves the signal to noise ratio of the device.

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Office Action issued in U.S. Appl. No. 10/516,334, filed Jun. 20, 2007.
Office Action issued in U.S. Appl. No. 10/516,334, filed Apr. 2, 2008.

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