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Proceedings Paper

Fiber optic process interfaces and applications
Author(s): Richard S. Harner
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Paper Abstract

Direct insertion of fiber optic probes into production streams to monitor chemical composition is an attractive concept from a cost and sampling standpoint. Goals including closed loop process control, raw material identification, and waster stream reduction cannot be realized if the fiber optic interface leaks or its signal output deteriorates. A successful long term probe interface must be a rugged and reliable as a conventional process transducer, yet allow normal maintenance activity. The wide variety of materials and environments encountered in production areas forces the designer to integrate technology from diverse fields and to capitalize on combinations which generate reliable results. Viable approaches include spring energized seals and adjustable pathlength in-line transmission cells. Although certain designs may operate effectively for limited periods of time, long term success demands identification and correction of failure modes in prototypes and utilization of construction materials compatible with the temperature, pressure, flow, and corrosion extremes at the sample point. The designs discussed herein can be scaled and modified at minimal additional cost to suit the current application.

Paper Details

Date Published: 14 August 1992
PDF: 4 pages
Proc. SPIE 1681, Optically Based Methods for Process Analysis, (14 August 1992); doi: 10.1117/12.137744
Show Author Affiliations
Richard S. Harner, Dow Chemical Co. (United States)


Published in SPIE Proceedings Vol. 1681:
Optically Based Methods for Process Analysis
David S. Bomse; Harry Brittain; Stuart Farquharson; Jeremy M. Lerner; Alan J. Rein; Cary Sohl; Terry R. Todd; Lois Weyer, Editor(s)

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