Optic-fibre polarimeter for process control

Hong-guang Wan

doi:10.1117/12.2294829

1 July 1990 Optic-fibre polarimeter for process control

Hong-guang Wan

Proceedings Volume 1230, International Conference on Optoelectronic Science and Engineering '90; 12305C (1990) https://doi.org/10.1117/12.2294829
Event: The Marketplace for Industrial Lasers 1990, 1990, Chicago, IL, United States

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. 99Ã‚Â°- + 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 0Ã‚Â°. So the luminance measured by the latter road is always I . The rotation can be obtained from formula Ã¢â‚¬Å¾ T2

Citation Download Citation

Hong-guang Wan "Optic-fibre polarimeter for process control", Proc. SPIE 1230, International Conference on Optoelectronic Science and Engineering '90, 12305C (1 July 1990); https://doi.org/10.1117/12.2294829

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