Sercel Inc.

Sylvie Menezo

Jean-Paul Menard

Mathieu Sanche

Isabelle Sellin

Hubert Dieulangard

Laurent Guerineau

An apparatus and a method for multiplexing and demultiplexing Fiber Optic Interferometric Sensors (FOISs), including means for forming an optical source, at least one sensing cable, at least one wavelength demultiplexing system, and a calibration system.

Fiber optic interferometric sensor array with increased multiplexing density

The invention relates to a fiber-optic seismic sensor () with a test body (), characterized in that the test body () comprises several separate dishes () that are distributed around the direction of the sensitive axis of the sensor and two star-shaped elements () placed on either side of the dishes () and mechanically linking said dishes () together.

Fiber-optic seismic sensor

The invention relates to an apparatus for multiplexing Fiber Optic Interferometric Sensors (FOISs), which apparatus comprises means (1) forming the an optical source for providing m*n distinct wavelengths &#x3bb;, &#x3bb;, . . . , &#x3bb;, &#x3bb;, &#x3bb;, . . . , &#x3bb;, . . . , &#x3bb;, &#x3bb;, . . . , &#x3bb;, the optical source including means for generating m groups () of light pulses, each group(1&#x2266;j&#x2266;m) being made up of n light pulses P(&#x3bb;), P(&#x3bb;), . . . , P(&#x3bb;) of distinct wavelengths &#x3bb;, &#x3bb;, . . . , &#x3bb;, the n light pulses P(&#x3bb;), P(&#x3bb;), . . . , P) being time delayed one from another, Fiber Optic Interferometric Sensors distributed in m groups () of n sensors each, then sensors of a same group being located at the same point and set into a star like arrangement around the input point of the group, and each of the n sensors of a same group, 1&#x2266;j&#x2266;m, being associated with wavelength selective means so that it is interrogated by one light pulse only among the pulses P(&#x3bb;), P(&#x3bb;), . . . , P(&#x3bb;) of distinct wavelengths respectively &#x3bb;, &#x3bb;, . . . , &#x3bb;.

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Nantes, France

Sylvie Menezo