Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1978-02-21
1980-03-11
Smith, Alfred E.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
250341, 250347, 356 72, 356 73, 350188, G01J 100, G01N 2100, G02B 1320
Patent
active
041929950
ABSTRACT:
A testing apparatus for making photometric measurements of transmission and reflectance of large parts uses a light beam having a spatially ill-defined energy distribution. A detector for receiving the light beam has a spatial variation in its sensitivity over its sensing area. A diffuser is provided which is disposed in the light beam for intercepting the light beam before it strikes the detector. The diffuser is formed of a white-like plastic and has a thickness which decreases progressively towards the outer edges of the same to compensate for the fall-off in sensitivity of the detector to rays closer to the outer margins of the diffuser or away from the center of the diffuser. The diffuser is formed in two portions in which a portion of the diffuser is in substantially closer proximity to the detector than the other portion to minimize the directional sensitivity of the detector.
The apparatus uses an invisible beam which is aimed by a coaxial visible beam. Measurements of transmission and reflectance are made in quick succession by moving the sample on a carriage and using a movable mirror assembly. The invisible beam is aimed separately for each of the two measurements.
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Jacobus et. al., "Visible Light-Emitting Diode", IBM Technical Disclosure Bulletin, vol. 10, No. 8, 1-68.
Fields Carolyn E.
Optical Coating Laboratory, Inc.
Smith Alfred E.
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