Gas spectroscopy

Details Gas spectroscopy Gas spectroscopy

1994-04-15

1996-02-13

Willis, David L.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

2503415, G01J 342

Patent

active

054913411

ABSTRACT:
A spectroscopy device comprises a laser diode/lens assembly driven by a periodic stepped laser diode drive current. Each period of the stepped laser diode drive current has a plurality of constant current intervals: a left baseline interval, a left skirt interval, a peak interval, a right skirt interval, and a right baseline interval. The left and right skirt constant current intervals are used to lock the laser radiation emitted during the peak interval onto a preselected absorption line. The left and right skirt intervals are also used to obtain a value indicative of line width. The peak interval is used to obtain a value indicative of peak absorbance. Multiplying the peak and line width values together yields a value indicative of a gas concentration which is substantially independent of foreign gas line-broadening effects.

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