Optics: measuring and testing – For light transmission or absorption – Of fluent material
Patent
1981-09-02
1987-08-18
Rosenberger, R. A.
Optics: measuring and testing
For light transmission or absorption
Of fluent material
250345, 250575, G01N 2161
Patent
active
046873376
ABSTRACT:
The extinction coefficient of atmospheric aerosol is measured by an instrument in which a single light beam from a graybody source is alternately directed through two similar optical paths to a detector. Each optical path traverses an equal length region of ambient air. Aerosols are filtered from the ambient air region of one optical path .The detector measures the modulation of the incident radiation and its output is a function of the extinction coefficient of the ambient air under test. A second detector is used to monitor the beam power. Processing electronics compute the extinction coefficient of the ambient air under test from the detector outputs. The ambient air regions of the two beam paths are alternately filtered for improved performance.
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Hansen Donald F.
Stewart Harold S.
Turner Vernon D.
Matthews Willard R.
Rosenberger R. A.
Singer Donald J.
The United States of America as represented by the Secretary of
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