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Proceedings Paper

Laser diode in combination with position-sensitive device forms a new model of liquid concentration sensor
Author(s): Zhiwen Pan; Shuwen Yang; Maoguo Cai
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Paper Abstract

This paper introduces, for the first time to the authors' knowledge, a novel use of laser diode (LD) in forming a sensor to measure the optical refractive index or concentration of liquids. The way described is also appropriate for precise displacement measurement, location and collimation. Special design by combining a LD and a position sensitive device enables this sensor to work for on-line test and remote control. This sensor is significantly much simpler in structure than those refractometers based on the optical principle of total reflection, which usually need complicated optical and/or electrical systems for achromatization, beam scanning or observation like Abbe Refractometers or those refractometers with CCD. With this sensor, we get a resolution power of refractive index of 0.0001 and a dynamic index range of 1.3330 up to 1.4247, corresponding to a range of sugar concentration in aqueous solution of about 0-52 percent at 20 degrees C. A better result is expectable.

Paper Details

Date Published: 24 September 1996
PDF: 5 pages
Proc. SPIE 2886, Semiconductor Lasers II, (24 September 1996); doi: 10.1117/12.251892
Show Author Affiliations
Zhiwen Pan, Shenzhen Univ. (China)
Shuwen Yang, Shenzhen Univ. (China)
Maoguo Cai, Shenzhen Univ. (China)

Published in SPIE Proceedings Vol. 2886:
Semiconductor Lasers II
Siamak Forouhar; Qiming Wang, Editor(s)

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