Lightning-safe diaphragm pressure gauge for geotechnical applications using a long-term reliable absolute EFPI sensor

Detlef Hofmann; Frank Basedau; Wolfgang R. Habel; R. Gloetzl

doi:10.1117/12.566543

9 June 2004 Lightning-safe diaphragm pressure gauge for geotechnical applications using a long-term reliable absolute EFPI sensor

Detlef Hofmann, Frank Basedau, Wolfgang R. Habel, R. Gloetzl

Author Affiliations +

Proceedings Volume 5502, Second European Workshop on Optical Fibre Sensors; (2004) https://doi.org/10.1117/12.566543
Event: Second European Workshop on Optical Fibre Sensors, 2004, Santander, Spain

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.

Citation Download Citation

Detlef Hofmann, Frank Basedau, Wolfgang R. Habel, and R. Gloetzl "Lightning-safe diaphragm pressure gauge for geotechnical applications using a long-term reliable absolute EFPI sensor", Proc. SPIE 5502, Second European Workshop on Optical Fibre Sensors, (9 June 2004); https://doi.org/10.1117/12.566543

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