Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1993-04-16
1995-09-05
Dzierzynski, Paul M.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
356319, G01J 342
Patent
active
054480710
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 from the laser diode onto a preselected absorption line. The left and right baseline constant current intervals are used to subtract baseline absorption measurements from peak constant current interval absorption measurements. A high frequency common mode noise rejection circuit rejects noise common to a monitor radiation detector and a radiation detector which detects radiation passing through a sample cell. A serial line locking cell is provided to allow locking when little or no absorbing material is present in the sample cell. A heated sample cell is provided to allow for the measurement of oxygen concentration in human breath. The pressure and temperature of the gas in the sample cell are detected to account for pressure and temperature dependencies of the absorption measurement. Techniques are disclosed for minimizing the effects of unwanted reflections off various surfaces of a spectroscopy device which otherwise would reflect back into the laser diode.
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Willard et
Doggett David E.
McCaul Bruce W.
Thorson Eric K.
Dzierzynski Paul M.
Hanig Richard
McCaul Bruce W.
Wallace T. Lester
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