Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrophotometer
Patent
1982-05-28
1985-07-16
Evans, F. L.
Optics: measuring and testing
By dispersed light spectroscopy
Utilizing a spectrophotometer
356448, G01J 342
Patent
active
045293082
ABSTRACT:
Spectrophotometer apparatus and method is disclosed which utilizes a totally unobstructed test light flux channel in combination with a periodically occluded reference light flux channel. The outputs of the test and reference channels are mixed and presented to a common light analyzing device from which successive timed-multiplexed measurements can be used to provide spectrophotometric data automatically corrected for drift in critical parameter values associated with the common source and/or light analyzing device. For example, by subtracting light flux measurements obtained during occluded periods from those obtained when the reference channel is not occluded, a measurement can be derived for the light flux passing through the reference channel alone. This derived measurement can then be used to drift-correct measurements made on the light flux coming through the test channel alone when the reference channel is occluded. Comparison of successive light flux measurements made under similar conditions (i.e., when the reference channel is occluded or when it is not occluded) can also be made to ensure that the specimen to be tested has settled into a relatively static condition where meaningful measurements can be made.
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Evans F. L.
Hunter Associates Laboratory Inc.
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