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Proceedings Paper

Lightning-safe diaphragm pressure gauge for geotechnical applications using a long-term reliable absolute EFPI sensor
Author(s): Detlef Hofmann; Frank Basedau; Wolfgang R. Habel; R. Gloetzl
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Paper Abstract

The paper describes a sensor head for long-term high-precision measurements of very small deflections of a diaphragm used for pressure gauges. High precision deformation measurement is assured by using a fiber Fabry-Perot interferometer sensor; identification of zero-point changes, and thus, long-term stable measurement is achieved by a specially designed absolute interferometer sensor. Several fiber optic solutions based on fiber Fabry-Perot technique have been investigated to find out a reliable sensor design. The presented sensor design has reached prototype status and allows to measure unambiguously static deformations with high precision. In order to evaluate repeatability and possible changes of zero-point reference if the head has been disconnected, validation of the described pressure gauge has been started. This validation work includes calibration and enables to evaluate possible drift effects, and to identify mechanical or thermal hysteresis.

Paper Details

Date Published: 9 June 2004
PDF: 4 pages
Proc. SPIE 5502, Second European Workshop on Optical Fibre Sensors, (9 June 2004); doi: 10.1117/12.566543
Show Author Affiliations
Detlef Hofmann, Federal Institute for Materials Research and Testing (Germany)
Frank Basedau, Federal Institute for Materials Research and Testing (Germany)
Wolfgang R. Habel, Federal Institute for Materials Research and Testing (Germany)
R. Gloetzl, Gloetzl Gesellschaft fuer Baumesstechnik GmbH (Germany)


Published in SPIE Proceedings Vol. 5502:
Second European Workshop on Optical Fibre Sensors
Jose Miguel Lopez-Higuera; Brian Culshaw, Editor(s)

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