Abstract: A device and method for holding a strain sensor for determining strain in an object includes a body. The body of the device includes a surface mountable frame, the frame being plate-shaped and including: at least two anchor portions for enabling attachment to a surface of the object, a strain sensitive region in an intermediate position between a first anchor portion and a second anchor portion of the at least two anchor portions, a sensor connection portion configured to hold at least one strain sensor for enabling attachment of the strain sensor to the frame in the strain sensitive region, and at least one elastic portion arranged in the strain sensitive region, the elastic portion being formed by a spring structure configured to modify a strain transmission from the object to the sensor connection portion of the frame. Preferably, the device holds a fiber optic strain sensor.

Abstract: An optical sensing device includes a support with an aperture. The optical sensing device can removably hold a sample against the support around the aperture. Accordingly, a portion of the sample is free to deform through the aperture in response to a change in an environmental condition. An optical waveguide is fixedly arranged with respect to the support whereby an end of the optical waveguide faces the aperture. The end of the optical waveguide forms an optical interferometric cavity with a refractive index discontinuity at a surface of the portion of the sample that is free to deform through the aperture.

Abstract: A hydrophone has a mandrel with a shell and a cylindrical cavity inwardly adjacent to the shell. A passage provides fluid communication between the cylindrical cavity and an exterior environment surrounding the mandrel. The hydrophone further has an optical fiber having an optical sensing section that is at least partially wound on the mandrel. The optical sensing section has an optical characteristic that varies as a function of a radial dimension of the mandrel. The mandrel has a core of solid material having a bulk modulus lower than 0.1 GPa. The cylindrical cavity is between the core and the shell.

Abstract: A device and method for holding a strain sensor for determining strain in an object includes a body. The body of the device includes a surface mountable frame, the frame being plate-shaped and including: at least two anchor portions for enabling attachment to a surface of the object, a strain sensitive region in an intermediate position between a first anchor portion and a second anchor portion of the at least two anchor portions, a sensor connection portion configured to hold at least one strain sensor for enabling attachment of the strain sensor to the frame in the strain sensitive region, and at least one elastic portion arranged in the strain sensitive region, the elastic portion being formed by a spring structure configured to modify a strain transmission from the object to the sensor connection portion of the frame. Preferably, the device holds a fiber optic strain sensor.

Abstract: The present document relates to a pressure sensor comprising a structural element, the structural element comprising a first and second structural part. The sensor further comprises a first cavity being in fluid connection with an exterior of the sensor for establishing a first pressure which is dependent on an external pressure in the first cavity and a second cavity configured to be at a second pressure in use. A deformable structure is deformable dependent on a pressure difference between the first pressure and the second pressure. The sensor comprises a fiber including an intrinsic fiber optic sensor fixed to the structural element and to the deformable structure for providing an optical sensor signal dependent on said pressure difference.

Abstract: The embankment monitoring system comprises an optic sensor chain (10) and an interrogator (20). The optic sensor chain (10) comprises a series of intrinsic fiber optic sensors (12) that are mutually spaced with respect to each other in a longitudinal direction of the optic sensor chain and at least one optic fiber (14) to optically connect the plurality of intrinsic fiber optic sensors to the interrogator. The interrogator is configured to issue an optic interrogation signal and the intrinsic fiber optic sensors are configured to respond to the optic interrogation signal with an optic measurement signal that is indicative for at least one physical parameter (P1) sensed by the intrinsic fiber optic sensors. The interrogator is further configured to process the optic measurement signals of the intrinsic fiber optic sensors to estimate a depth (d) as a function of a position (p) along said optic sensor chain (10).