# US 2014/0153863 A1 · Strain measurement device and installation of such a device in an element > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0153863 A1 - Document ID: US20140153863A1 - Status: Published application - Kind: A1 - Application number: 14/080,858 - Filed: 2013-11-15 - Published: 2014-06-05 - Earliest claimed: 2012-11-23 - Assignees: Airbus Operations GmbH - Applicants: Airbus Operations S.A.S. - Inventors: Marc Sartor; Patricia Morgue; Manuel Paredes - Web page: https://patentgrep.com/patent/US20140153863A1 ## CPC - G01B 11/165: {by means of a grating deformed by the object} - G01B 11/18: {using photoelastic elements} - G01D 5/35316: {using a Bragg gratings} - G01L 1/246: {using integrated gratings, e.g. Bragg gratings} - G01M 5/0025: {of elongated objects, e.g. pipes, masts, towers or railways (G01M5/0058 takes precedence)} - G01M 5/0041: {by determining deflection or stress} - G01M 5/0091: {by using electromagnetic excitation or detection} - G01M 11/086: {Details about the embedment of the optical fiber within the DUT} - G01B: MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS - G01D: MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR - G01L: MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE (weighing G01G) - G01M: TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR ## Abstract A strain measurement device is provided. The strain measurement device includes at least one filiform strain sensor and a support of longilinear shape on which the filiform strain sensor is positioned. The strain measurement device also includes a stiffener. ## Claims ### Claim 1 A strain measurement device, comprising: at least one filiform strain sensor; a support of longilinear shape on which the filiform strain sensor is positioned; and a stiffener. ### Claim 2 (depends on 1) The device according to claim 1, wherein the stiffener is at most fixed to the support at one point. ### Claim 3 (depends on 2) The device according to claim 2, wherein the stiffener and a wall of the support are coupled together so as to define a space between the stiffener and the wall of the support so that the support retains a freedom of movement with respect to bending. ### Claim 4 (depends on 1) The device according to claim 1, wherein the filiform strain sensor is an optical fibre Bragg grating. ### Claim 5 (depends on 1) The device according to claim 1, wherein the support is hollow, and has a longitudinal direction and a width, with the support further comprising a wall having a thickness and having an external surface on which the filiform strain sensor is positioned by one or more connecting points, a main strain direction of the filiform strain sensor being arranged parallel to the longitudinal direction of the support. ### Claim 6 (depends on 5) The device according to claim 5, wherein one end of the support is blocked. ### Claim 7 (depends on 6) The device according to claim 6, wherein the support is blocked by a cap an end of which extends beyond the end of the support. ### Claim 8 (depends on 1) The device according to claim 1, wherein the device comprises a thin tube encapsulating at least the filiform strain sensor with a binder. ### Claim 9 (depends on 5) The device according to claim 5, further comprising an additional strain sensor, free of deformation with respect to the support, and situated in an internal volume defined by the wall of the hollow support. ### Claim 10 A structural element, comprising: a first surface; a hole having a first end that opens onto a first surface; a strain measurement device received in at least one measurement zone associated with the hole, the strain measurement device including at least one filiform strain sensor, a support of longilinear shape on which the filiform strain sensor is positioned and a stiffener; and a binder forming a film surrounding the strain measurement device. ### Claim 11 (depends on 10) The structural element according to claim 10, wherein the hole has a second end which is closed. ### Claim 12 (depends on 10) The structural element according to claim 10, wherein the hole is at least approximately coaxial with an axis of symmetry of the element. ### Claim 13 A method for measuring a strain in a given direction within a structural element, comprising: introducing a binder into a hole formed in the structural element; inserting a strain measurement device into the hole filled with the binder, the strain measurement device including at least one filiform strain sensor, a support of longilinear shape on which the filiform strain sensor is positioned and a stiffener; and connecting the filiform strain sensor of the strain measurement device to a measurement device. ### Claim 14 (depends on 13) The method according to claim 13, wherein the strain measurement device is introduced at the same time as the stiffener arranged inside a hollow support of the strain measurement device and the stiffener is withdrawn once the strain measurement device is inserted into the hole. ### Claim 15 (depends on 14) The method according to claim 14, wherein the strain measurement device is introduced using the stiffener. ### Claim 16 (depends on 10) The structural element according to claim 10, wherein the stiffener is at most fixed to the support at one point. ### Claim 17 (depends on 16) The structural element according to claim 16, wherein the stiffener and a wall of the support are coupled together so as to define a space between the stiffener and the wall of the support so that the support retains a freedom of movement with respect to bending. ### Claim 18 (depends on 10) The structural element according to claim 10, wherein the filiform strain sensor is an optical fibre Bragg grating. ### Claim 19 (depends on 13) The method according to claim 13, wherein the filiform strain sensor is an optical fibre Bragg grating.