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Proceedings Paper

Liquid-level sensor based in laser feedback interferometry for oil tanks applications
Author(s): María L. Pelayo-Fernández; José L. Arce-Diego; D. Pereda-Cubián; O. Ormachea; O. G. Romanov; A. L. Tolstik
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Paper Abstract

Measurement of liquid level in tanks is an important function in many industrial processes. Optical-fiber sensors have high sensitivity and its non-electrical nature and immunity to electromagnetic interference make them safe for applications in explosive environments and oil tanks. In this work we present a liquid-level sensor system based on laser feedback interferometry. Considering that the index of refraction of liquid hydrocarbons is in the range from 1.45 to 1.55, and the air reflectivity varies between 3.37% and 4.65%, we could demonstrate that it is possible to measure displacements of even 8.00 meters with a resolution of a half of the wavelength of the signal emitted. Thus, we can obtain a sensor with a high resolution in a broad range of measurements based in this technique. The effects of undesired internal reflections or backscattering due to the oil vapor could be also taken into account.

Paper Details

Date Published: 18 April 2006
PDF: 6 pages
Proc. SPIE 6180, Photonics, Devices, and Systems III, 61800C (18 April 2006); doi: 10.1117/12.675650
Show Author Affiliations
María L. Pelayo-Fernández, Univ. of Cantabria (Spain)
José L. Arce-Diego, Univ. of Cantabria (Spain)
D. Pereda-Cubián, Univ. of Cantabria (Spain)
O. Ormachea, Belarussian State Univ. (Belarus)
O. G. Romanov, Belarussian State Univ. (Belarus)
A. L. Tolstik, Belarussian State Univ. (Belarus)

Published in SPIE Proceedings Vol. 6180:
Photonics, Devices, and Systems III
Pavel Tománek; Miroslav Hrabovský; Miroslav Miler; Dagmar Senderákova, Editor(s)

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