Optics: measuring and testing – By shade or color – Fluid color transmission examination
Patent
1988-05-18
1990-06-19
McGraw, Vincent P.
Optics: measuring and testing
By shade or color
Fluid color transmission examination
250343, 356437, 356440, G01N 2117, G01N 2135
Patent
active
049348167
ABSTRACT:
The disclosure relates to an apparatus and method for increasing the sensitivity of laser absorption detection of gas phase atoms and molecular species within a gaseous medium. An active optical element in a laser absorption detection system is translationally (longitudinally) vibrated a selected amplitude along the optical axis and at a desired frequency to eliminate fringes produced by interference fringe producing optical elements. The vibration frequency is preferably asynchronous with other modulation frequencies in the system.
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A Versatile Technique for Reducing Optical Interference Fringes in Laser Absorption Experiments, retitled "Optical Interference Fringes in Laser Absorption Experiments", Appl. Opt. 27, 1914 (1988) by Silver and Stanton.
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Silver Joel A.
Stanton Alan C.
McGraw Vincent P.
Peacock Deborah A.
Southwest Sciences Incorporated
Weig Robert W.
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