Mr. Damien Ponceau Profile

Damien Ponceau

at Commissariat a l'Energie Atomique

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Proceedings Article | 10 September 2009 Paper

Bulk optics for seismological applications

S. Olivier, D. Ponceau, P. Millier, N. Brebion

Proceedings Volume 7424, 74240P (2009) https://doi.org/10.1117/12.827861

KEYWORDS: Transducers, Interferometers, Motion measurement, Beam splitters, Prototyping, Surface plasmons, Michelson interferometers, Interferometry, Photodiodes, Optical fibers

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A digital seismic measuring chain is an electromechanical system able to record the lowest natural ground motions observable on Earth but also to measure signals from largest earthquakes. Its cornerstones are an inertial seismometer and a digitizer. As equipments available on the market don't answer to all seismological applications CEA/DAM/DIF (Commissariat a l'Energie Atomique/Direction des Applications Militaires/ Ile De France) is interested in, it has developed the adequate digital seismic measuring chains. Today, the technologies used have reached their maturity. New sensing techniques need to be developed. Optical sensors are now widely used in vibrometry and motion measurements. Such devices generally use interferometry and frange interpolation to achieve high resolution with a large dynamic range. We have developed macroscopic prototype digital motion transducer from a Michelson interferometer in order to evaluate the potential of this technology for seismological applications. First, tests were carried out to validate the operation of these transducers and to estimate their main characteristics for seismological applications. We focused on transducer motion range, intrinsic noise and temperature sensitivity. We have evaluated and compared performances of such interferometers in visible (632 nm) and in infrared (1550 nm) range. Then, we have experimentally evaluated noise sources in displacement measurement. Last, we designed Michelson interferometer with integrated optics component with a company which is specialized in integrated optics. Expected results are presented in this document.

Proceedings Article | 28 April 2008 Paper

Subnanometric Michelson interferometry for seismological applications

D. Ponceau, P. Millier, S. Olivier

Proceedings Volume 7003, 70030U (2008) https://doi.org/10.1117/12.777491

KEYWORDS: Transducers, Prototyping, Interferometry, Motion measurement, Interferometers, Beam splitters, Michelson interferometers, Mirrors, Polarization, Temperature metrology

Read Abstract +

A digital seismic measuring chain is an electromechanical system able to record the lowest natural ground motions observable on Earth but also to measure signals from largest earthquakes. Its cornerstones are an inertial seismometer and a digitizer. As equipments available on the market don't answer to all seismological applications CEA/DASE (Commissariat a l'Energie Atomique/Departement analyse, surveillance, environnement) is interested in, it has developed the adequate digital seismic measuring chains. Today, the technologies used have reached their maturity. New sensing techniques need to be developed. Optical sensors are now widely used in vibrometry and displacement measurements. Such devices generally use interferometry to achieve subnanometric resolution with a large dynamic range. We have developed a prototype digital motion transducer from a Michelson interferometer in order to evaluate the potential of this technology for seismological applications. Tests were carried out to validate the operation of this transducer and to estimate its main characteristics for seismological applications. We focused on transducer motion range and intrinsic noise. Results are promising. Prototype intrinsic noise reaches levels as small as 100 fm/√Hz around 8 Hz and is better than that of present transducers all over the bandwidth of interest, motion range also. Interesting seismological applications can be considered leading to more accurate seismic measuring chains, easier to manufacture, deploy and operate.

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