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Proceedings Paper

Dual-Beam Double Pass Optical Sensor For On-Line Web Transmission Measurements
Author(s): A. G. Kravetz
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Paper Abstract

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.

Paper Details

Date Published: 29 January 1985
PDF: 4 pages
Proc. SPIE 0518, Optical Systems Engineering IV, (29 January 1985); doi: 10.1117/12.945186
Show Author Affiliations
A. G. Kravetz, Kollmorgen Corporation (United States)

Published in SPIE Proceedings Vol. 0518:
Optical Systems Engineering IV
Paul R. Yoder, Editor(s)

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