Off-line-locked laser diode species monitor system

Details Off-line-locked laser diode species monitor system Off-line-locked laser diode species monitor system

1994-10-14

1995-10-17

Rosenberger, Richard A.

Optics: measuring and testing

For light transmission or absorption

Of fluent material

G01N 2161

Patent

active

054595746

ABSTRACT:
An off-line-locked laser diode species monitor system includes: reference means for including at least one known species having a first absorption wavelength; a laser source for irradiating the reference means and at least one sample species having a second absorption wavelength differing from the first absorption wavelength by a predetermined amount; means for locking the wavelength of the laser source to the first wavelength of the at least one known species in the reference means; a controller for defeating the means for locking and for displacing the laser source wavelength from said first absorption wavelength by said predetermined amount to the second absorption wavelength; and a sample detector device for determining laser radiation absorption at the second wavelength transmitted through the sample to detect the presence of the at least one sample species.

REFERENCES:
patent: 5026991 (1991-06-01), Goldstein et al.
patent: 5047639 (1991-09-01), Wong
patent: 5202560 (1993-04-01), Koch et al.

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