Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrophotometer
Patent
1981-03-09
1983-10-18
Evans, F. L.
Optics: measuring and testing
By dispersed light spectroscopy
Utilizing a spectrophotometer
356 51, 250339, 250345, 2503541, G01J 342, G01N 2139
Patent
active
044102739
ABSTRACT:
A scanning spectrometer incorporating a scanning diode laser powered with a controllable injection current. The injection current control may be set at predetermined discrete levels. These levels may be varied in accordance with signals derived from a servo loop, and may have superimposed upon them a cyclically varying substantially constant amplitude current. The laser output is directed via a beam splitter to both sample and reference cells. The material in the reference cell is so selected as to provide absorption features at each of the desired frequencies. The cyclically varying current is provided with an amplitude sufficient to cause a frequency amplitude at least as great as the maximum breadth of each of these spectral features of interest. The preselected bias currents are selected so as to provide lasing action of the diode at or near each of the selected frequencies. A phase-locked amplifier tuned to the frequency of the cyclically varying current senses the position of the scanned laser output relative to that of the associated absorption feature and provides an error signal to adjust the bias current so as to center the cyclically scanned laser frequency on the selected absorption feature.
REFERENCES:
patent: 3805074 (1974-04-01), McCormack
patent: 4061918 (1977-12-01), Preier et al.
Chapman Dudley M.
Eng Richard S.
Mantz Arlan W.
Nill Kenneth W.
Wall David L.
Evans F. L.
Laser Analytics, Inc.
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