Saab Ab

Daniel Eckerstroem

Roy Josefsson

Mats Forselius

David Esselius

A method is provided for determining temperature changes of an optical fibre having Fiber Bragg Grating patterns provided in at least one portion of the optical fibre. The method involves: emitting light into the optical fibre in a first direction from a first detector arrangement, receiving reflections from the patterns of such emitted light by the first detector arrangement, and processing the reflections for determining a current temperature change related to the optical fibre; and on the basis of predetermined criteria, emitting light into the optical fibre in an opposite, second, direction from a second detector arrangement, receiving reflections from the patterns of such emitted light by the second detector arrangement, and processing the reflections for determining a current temperature change related to the optical fibre. A computer program product comprising program code for implementing the above-described method is also provided, along with an associated system and platform.

System and method for determining changes of an optical fibre

The present disclosure relates to an arrangement () for obtaining a quantity related to a temperature along a part of an optical fibre (). The arrangement comprises a light emitter () arranged to emit light into the optical fibre (). The optical fibre is at at least one location along said part of the optical fibre provided with a Fibre Bragg Gratings, FBGs (), wherein the FBGs are arranged to reflect light within a predetermined wavelength range. The arrangement further comprises a detector () arranged to receive and detect the reflected light, a first optical shutter () arranged in the optical path after the light emitter. The first optical shutter is arranged to be opened and closed in order to let the emitted light through and into the optical fibre (), a second optical shutter () arranged to be opened and closed in order to let the reflected light through, and an optical circulator () having a first, a second and a third port. The optical circulator is operatively connected to the first optical shutter () at the first port, to the part of the optical fibre provided with the FBGs () at the second port, and to the second optical shutter () at the third port. A control unit () is arranged to control the first optical shutter () and the second optical shutter (). The control unit () is arranged to coordinate the timing of the opening of the first optical shutter () and the second optical shutter (), respectively.

Arrangement and method for obtaining a quantity related to a temperature along a part of an optical fibre

A method is provided for determining temperature changes of an optical fibre having Fiber Bragg Grating (FBG) patterns provided in at least one portion (Portion) of the optical fibre. The optical fibre is connected between a first detector arrangement and a second detector arrangement. Light is emitted into the optical fibre in a first direction from the first detector arrangement, which receives reflections from the FBG patterns of the emitted light. The reflections are processed for determining a current temperature change related to the optical fibre. On the basis of predetermined criteria, light is emitted into the optical fibre in an opposite second, direction from the second detector arrangement. The second detector arrangement receives reflections from the FBG patterns of the light emitted in the second direction and the reflections are processed for determining a current temperature change related to the optical fibre.

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Bankeryd, Sweden

Daniel Eckerstroem