Optical gas detection

Details Optical gas detection Optical gas detection

2005-12-16

2010-06-01

Toatley, Jr., Gregory J (Department: 2877)

Optics: measuring and testing

For light transmission or absorption

Of fluent material

Reexamination Certificate

active

07728977

ABSTRACT:
The present invention provides a transmitter unit for an open path gas detector for detecting a target gas and comprises: a radiation transmitter, e.g. a tuneable laser diode, capable of emitting radiation at a wavelength absorbed by the target gas, and a radiation deflector, having a deflecting part and a non-deflecting part, e.g. a mirror having a non-reflective part. The deflecting part and the non-deflecting part are located in the path of the radiation emitted by the transmitter and the non-deflecting part does not deflect the said radiation emitted by the transmitter or does so to a different extent than the deflecting part. In this way, the beam has a core in shadow that can be used to align the beam with a receiver unit. The radiation deflector is preferably a mirror having a reflective surface for reflecting radiation emitted by the transmitter and a non-reflective part that does not reflect the said radiation emitted by the transmitter or does so to a lesser extent that the reflecting surface. The non-reflective part is preferably transparent so that it allows radiation to pass through it, which can be used to measure the wavelength of the transmitter and, if necessary correct it.

REFERENCES:
patent: 3662171 (1972-05-01), Brengman et al.
patent: 4452532 (1984-06-01), Grollimund et al.
patent: 5420723 (1995-05-01), Galle
patent: 5591975 (1997-01-01), Jack et al.
patent: 5767976 (1998-06-01), Ankerhold et al.
patent: 6351309 (2002-02-01), Bomse et al.
patent: 6538728 (2003-03-01), Stolle et al.
patent: 7030991 (2006-04-01), Kampe et al.
patent: 2001/0025927 (2001-10-01), Ankerhold
patent: 2 353 591 (2001-02-01), None
patent: 2 373 045 (2002-11-01), None
patent: WO 01/81878 (2001-01-01), None
PCT International Searching Authority, EPO, Mason, W., International Search Report, mailed May 16, 2006, 6 pages.
Canadian Search Report, dated Nov. 5, 2009 corresponding to Canadian application No. 2,590,216.

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