Optics: measuring and testing – For light transmission or absorption – Of fluent material
Patent
1978-08-31
1980-11-18
Evans, F. L.
Optics: measuring and testing
For light transmission or absorption
Of fluent material
250343, G01N 2139
Patent
active
042342589
ABSTRACT:
An optoacoustic detector for gas analysis is implemented with Stark-effect cell modulation for switching a beam in and out of coincidence with a spectral line of a constituent gas in order to eliminate the heating effect of laser energy in the cell as a source of background noise. By using a multiline laser, and linearly sweeping the DC bias voltage while exciting the cell with a multiline laser, it is possible to obtain a spectrum from which to determine the combination of excited constituents and determine their concentrations in parts per million.
REFERENCES:
patent: 4105919 (1978-08-01), Bridges et al.
Frosch Robert A. Administrator of the National Aeronautics and Space
Margolis Jack S.
Shumate Michael S.
Evans F. L.
Manning John R.
McCaul Paul F.
Mott Monte F.
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