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29 January 1985 Dual-Beam Double Pass Optical Sensor For On-Line Web Transmission Measurements
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Proceedings Volume 0518, Optical Systems Engineering IV; (1985)
Event: 1984 Cambridge Symposium, 1984, Cambridge, United States
Photoconductive detectors, such as lead sulfide, can be incorporated in near infra-red instrumentation if their temperature related instabilities can be overcome. The changes in detectivity and spectral responsivity of lead sulfide due to ambient temperature fluctuations often exceed the "measurement signal" making accurate and repeatable measurements almost impossible. Additional inaccuracies can be introduced by opto-mechanical movement, electronic gain and offset changes, source fluctuations and detector noise. These are the common problems that the typical dual-beamed, dark-corrected laboratory spectrophotometers are designed to overcome. For certain applications sample temperature variation also introduces inaccuracies. This paper describes the design of a sensor that incorporates dual beaming and dark correction such as one would commonly find in a laboratory spectrophotometer. However, this sensor is used in a production environment in an on-line situation for the measurement of the spectral transmission properties of plastic film. Under these conditions, there is no "sample compartment" to contain a reference path. The method for achieving this path and experimental results will be presented.
© (1985) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
A. G. Kravetz "Dual-Beam Double Pass Optical Sensor For On-Line Web Transmission Measurements", Proc. SPIE 0518, Optical Systems Engineering IV, (29 January 1985);

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