Optics: measuring and testing – For light transmission or absorption – Of fluent material
Patent
1989-05-01
1991-12-31
McGraw, Vincent P.
Optics: measuring and testing
For light transmission or absorption
Of fluent material
356352, 356346, 2503381, 250339, G01N 2159, G01B 902
Patent
active
050766996
ABSTRACT:
A remote gas measuring apparatus and method utilizes the optical absorption line characteristics to determine an amount of gas of interest as may exist in an area under study. The remote gas measuring apparatus includes a source of electromagnetic radiation that can be projected toward the area in question and a light collecting arrangement. The light signal received is coupled to a fast light switch modulator which modulates the light signal to a first frequency. A second modulating arrangement modulates the light signal to a second frequency and includes a birefringent etalon device having a periodic spacing equal to the periodicity of the absorption lines of the gas of interest. The second modulating means is further effective such that, when an electric field is applied thereto the transmission spectra associated with the light signal is shifted between spectra which coincide with the absorption lines and spectra which fall between the absorption lines. The light signal from the etalon device is then conditioned and input to a detector configuration which distinguishes between the light signal at the first frequency and the light signal at the second frequency in order to determine at least a quantity of the gas of interest.
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Frolich et al., Tuning Properties of a Birefringent Fabry-Perot Etalon/Appl. Phys. 9, No. 3 (Mar. 76), pp. 205-207, copy 356/352.
Article entitled "Scanning the Field for Ideas", reprinted from Machine Design, vol. 54, No. 24 (Oct. 1982).
Gottlieb Milton S.
Ryan Frederick M.
Keesee LaCharles P.
McGraw Vincent P.
Rosemount Analytical Inc.
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