Gas spectroscopy

Details Gas spectroscopy Gas spectroscopy

1994-12-21

2000-11-21

Westin, Edward P.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

2503413, G01N 2117

Patent

active

061506613

ABSTRACT:
An absorption spectroscopy device for determining the concentration of a gas (such as oxygen) in a sample cell includes a neutral density absorber or a quarter wave plate. Laser radiation from a laser diode passes through the neutral density absorber or the quarter wave plate, then passes through the sample cell, and then is incident upon a detector. In some embodiments, the laser diode is driven with a drive current having a stepped periodic waveform.

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