Laser diode gas sensor

Details Laser diode gas sensor Laser diode gas sensor

1997-01-08

1998-06-16

McGraw, Vincent P.

Optics: measuring and testing

For light transmission or absorption

Of fluent material

2503385, 356438, G01N 2131, G01N 2135

Patent

active

057679762

ABSTRACT:
A laser diode gas sensor for the spectroscopic measurement of a gas sample, with a retroreflector and a concave mirror, which define between them an open measuring path with the gas to be analyzed. Laser light passes through the measuring path, is reflected at the retroreflector, and is directed toward a detector via a concave mirror in order to determine the mean concentration of the gas component to be analyzed in the optical measuring path. Optical elements, such as beam splitters, lenses, etc., which lead to losses of intensity, were used before to couple the laser light into the beam path onto the retroreflector, and to decouple the reflected light to the detector. An improved optical imaging array, which minimizes losses, is provided. The concave mirror is provided centrally with an opening transparent to the laser light, through which a weakly divergent bundle of laser light is directed onto the retroreflector, so that the retroreflector is illuminated essentially over its entire surface. The retroreflector is made with a matrix consisting of a plurality of triple mirrors, which reflect the incident, weakly divergent bundle of laser beams as a bundle of laser beams with convergent properties onto the concave mirror. The concave mirror is arranged or shaped such that the laser light reflected by the retroreflector is focused by the concave mirror directly onto the detector, which is arranged outside the principal beam path.

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H. Riris, C. B. Carlisle, L. W. Carr, De. E. Cooper, R. U. Martinelli, and R. J. Menna, Oct. 20, 1994, Design of an open path near-infrared diode laser sensor: application to oxygen, water, and carbon dioxide vapor detection, 1994 Optical Society of America, Applied Optics, vol. 33, No. 30.
Henrik Ahlberg, Stefan Lundqvist, Robert Tell and Torbjorn Andersson, 1994, Laser spectroscopy for in situ ammonia monitoring, LASER SPECTROSCOPY Spectroscopy Europe 1994.
H. I. Schiff, S. D. Nadler and G. I. Mackay, 1995, The Lasair -New Remote Sensing Instruments Based on Near Infrared Diode Lasers, SPIE vol. 2366, pp. 65-69.

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