Boots – shoes – and leggings
Patent
1982-06-03
1985-04-02
Thomas, James D.
Boots, shoes, and leggings
250339, G01N 2125, G01N 2129
Patent
active
045091307
ABSTRACT:
A system for remote absorption spectroscopy of trace species using a diode laser (14) tunable over a useful spectral region of 50 to 200 cm.sup.-1 by control of diode laser temperature over range from 15.degree. K. to 100.degree. K., and tunable over a smaller region of typically 0.1 to 10 cm.sup.-1 by control of the diode laser current over a range from 0 to 2 amps. Diode laser temperature and current set points are transmitted to the instrument in digital form and stored in memory (32) for retrieval under control of a microprocessor (28) during measurements. The laser diode current is determined by a digital-to-analog converter (62) through a field-effect transistor (Q.sub.1) for a high degree of ambient temperature stability, while the laser diode temperature is determined by set points entered into a digital-to-analog converter (64) under control of the microprocessor. Temperature of the laser diode is sensed by a sensor diode (18) to provide negative feedback to the temperature control circuit that responds to the temperature control digital-to-analog converter (64).
REFERENCES:
patent: 3805074 (1974-04-01), McCormack
patent: 3829694 (1974-08-01), Goto
patent: 3863177 (1975-01-01), Daman et al.
patent: 4410273 (1983-10-01), Mantz et al.
patent: 4410992 (1983-10-01), Javan
patent: 4425503 (1984-01-01), Watkins et al.
Argonne National Laboratory's, "Gamma Ray Spectrometer", 9/64.
Menzies Robert T.
Rutledge Charles W.
Jones Thomas H.
Manning John R.
McCaul Paul F.
Shaw Dale M.
The United States of America as represented by the Administrator
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