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Proceedings Paper

Optic-fibre polarimeter for process control
Author(s): Hong-guang Wan
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Paper Abstract

So far, all polarimeters are used by sampling. But this optic-fiber polarimeter for process control designed here is able to work in manufacturing pipes or tanks with its sensor connected with optic-fibers is directly set into the liquid in these pipes or tanks. And its measuring range can reach -359. 99°- + 359. 99. It can successfully measure, keep watch and control automatic process. The system configuration of the instrument is displayed in Fig 1. The light from sodium lamp is sent to the sensor through one of the optic-fiber roads and polarized by the first polariscope. Then the light goes through the measured liquid to the second polariscope (its plane of the polarization is identical with the first one). Then, the light including rotatory power information of the liquid is sent to the photo-detector through optic-fibers and transformed into voltage by the photo-detector. With the voltage amplified the corresponding luminance I is obtained. The other road is a reference. Instead of polariscopes, this reference road has an attenuator which makes the light loss equal to the loss in that road with polariscopes when the rotation of the measured liquid is 0°. So the luminance measured by the latter road is always I . The rotation can be obtained from formula „ T2

Paper Details

Date Published: 1 July 1990
PDF: 2 pages
Proc. SPIE 1230, International Conference on Optoelectronic Science and Engineering '90, 12305C (1 July 1990); doi: 10.1117/12.2294829
Show Author Affiliations
Hong-guang Wan, Qingdao Electronic Research Institute (China)

Published in SPIE Proceedings Vol. 1230:
International Conference on Optoelectronic Science and Engineering '90
DaHeng Wang, Editor(s)

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