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Proceedings Paper

Fiber Optic Gauges Calibration In The Pressure Range Of 10 To 430 Gpa
Author(s): M. Bouchu; J. L. Labaste
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Paper Abstract

Optical fiber gauges are commonly used in hydrodynamic experiments to measure the arrival time of shock waves or free surfaces at different locations. The light pulse emitted by the shock loaded gauges is recorded by means of a streak opto-electronical camera (this technique has been described by J.P. GAUTHIER at the 13th International High Speed Photography and Photonics meeting in TOKYO 1978). The aim of the work presented in this paper is to characterize the response of such gauges under shock loading between 10 GPa and 430 GPa. Optical density versus time is analysed in order to know if optical fiber gauges can be used as pressure transducers. There is effectively an important variation of the emitted light versus pressure. Assuming the first optical density peak is related to the maximum air gap pressure of gauges, we study the variation of this peak versus shock pressure. An important dispersion, due to the gauges as well as to the transmission line and the recording camera, can be observed on the results. Nevertheless, it is possible to get an optical density versus pressure relation and also to correlate the optical variation density versus time with the shock propagation inside the gauge. Thus we notice that the rise time varies from 10 ns for 428 GPa to 100 ns for 16 GPa.

Paper Details

Date Published: 1 February 1985
PDF: 7 pages
Proc. SPIE 0491, 16th Intl Congress on High Speed Photography and Photonics, (1 February 1985); doi: 10.1117/12.967984
Show Author Affiliations
M. Bouchu, C.E.A. - C.E.V. (France)
J. L. Labaste, C.E.A. - C.E.V. (France)

Published in SPIE Proceedings Vol. 0491:
16th Intl Congress on High Speed Photography and Photonics
Michel L. Andre; Manfred Hugenschmidt, Editor(s)

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