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GEOSWIFTS - Application of an Optically Integrated Spectrometer to Strain Measurement Using Bragg SensorsNormal access

Authors: O. Coutant, E. Le Coarer and F. Thomas
Event name: EAGE/DGG Workshop 2017
Session: Instrumentation
Publication date: 31 March 2017
DOI: 10.3997/2214-4609.201700154
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 1.11Mb )
Price: € 20

We have developed and tested a new strainmeter using a low power, field oriented and optically integrated spectrometer coupled to optical fiber Bragg sensors. Different configuration of Bragg sensors may be used, from single Bragg reflector, Fabry-Perot Bragg resonator to Michelson interferometer. The sensitivity of the instrument scale according its length. A 2 cm Fabry-Perot can record down to 50 nanostrain while a 20m Michelson can go down to a few picostrain. We show examples of record obtained with a 3cm Fabry-Perot and a 20m

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