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18 April 2006 Liquid-level sensor based in laser feedback interferometry for oil tanks applications
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Proceedings Volume 6180, Photonics, Devices, and Systems III; 61800C (2006)
Event: Photonics, Devices, and Systems III, 2005, Prague, Czech Republic
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.
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María L. Pelayo-Fernández, José L. Arce-Diego, D. Pereda-Cubián, O. Ormachea, O. G. Romanov, and A. L. Tolstik "Liquid-level sensor based in laser feedback interferometry for oil tanks applications", Proc. SPIE 6180, Photonics, Devices, and Systems III, 61800C (18 April 2006);

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