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Optical Engineering

Studies on the propagnation of light from a light-emitting diode through a glass tube and development of an opto-sensor for the continuous detection of liquid level
Author(s): Nabinbaran Manik; S.C. Mukherjee; A.N. Basu
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Paper Abstract

The authors develop a new technique for continuous measurement of liquid level by an optosensor. The objectives are (i) to study the propagation of light from a light-emitting diode (LED) through a glass tube and (ii) based on this principle, to develop a continuous liquid level sensor. The attenuation of light from an LED through a glass tube with distance has been investigated and an empirical relation for it has been established. The result is applied to the detection of water level. The sensor comprises a hollow glass tube with a combined LED- photodetector assembly (the optosensor) and a light reflector inside the tube. The reflector floats on the liquid surface, and light emitted from the LED is detected after reflection from it. The detected light intensity varies with the distance between the optosensor and the reflector. The position of the float changes with the variation of the liquid level. The present level sensor can detect a change of liquid level at distances up to 80 cm with an accuracy of the order of 0.5 mm.

Paper Details

Date Published: 1 December 2001
PDF: 7 pages
Opt. Eng. 40(12) doi: 10.1117/1.1417496
Published in: Optical Engineering Volume 40, Issue 12
Show Author Affiliations
Nabinbaran Manik, Jadavpur University (India)
S.C. Mukherjee, Adv Ctr of Cryogenic Research (India)
A.N. Basu, Jadavpur University (India)

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