A method of wrapping optical fiber around a fluid conduit. The optical fiber is wrapped at least partially around the conduit. The optical fiber is secured relative to the conduit at one or more securing locations, thereby defining a sequence of multiple optical fiber portions. Each optical fiber portion comprises a portion of the optical fiber. Each securing location delimits a given optical fiber portion from the subsequent optical fiber portion in the sequence of optical fiber portions. A direction of wrapping of each consecutive optical fiber portion in the sequence of optical fiber portions may be alternated between a clockwise direction and a counter-clockwise direction.

The present disclosure describes systems and methods for conducting deformation (e.g., extension and/or strain) measurements based on characteristics of a test specimen using light sourced from a single side of a test specimen. The light source and an imaging device are arranged on a single side of the test specimen relative to a back screen while the light source illuminates both a front surface of the test specimen and the back screen. The back screen reflects light to create a silhouette of the test specimen. The imaging device captures images of one or more markers on a front surface of the test specimen, as well as measuring position of the markers during the testing process. The imaging device also measures relative changes in position of the edges of the test specimen during the testing process, by analyzing the edges of the silhouetted image created by the reflective back screen.

A compact displacement sensor comprises a light intensity pattern object, a micro-lens array and an imaging device including a light-intensity measuring surface. The micro-lens array is disposed between the light intensity pattern object and the imaging device such that each micro-lens focuses a corresponding sub-image making up a portion of the light-intensity pattern on the light-intensity measuring surface to create thereupon an image of the object comprising an array of focused sub-images. The displacement sensor can provide high resolution measurements of displacement of the light intensity pattern object from a reference position by registering subsequent images captured after a change in relative position between light intensity pattern object and the imaging device to a reference image based on pattern portions in the focused sub-images.

A deformable sensor comprises an enclosure comprising a deformable membrane, the enclosure configured to be filled with a medium, and an imaging sensor, disposed within the enclosure, having a field of view configured to be directed toward a bottom surface of the deformable membrane. The imaging sensor is configured to capture an image of the deformable membrane. The deformable sensor is configured to determine depth values for a plurality of points on the deformable membrane based on the image captured by the imaging sensor and a trained neural network.

A strain distribution measurement system includes a tensile tester that deforms a test piece to measure mechanical properties of a material of the test piece, and a strain distribution measuring device that measures a strain distribution of the test piece. The strain distribution measuring device measures the strain distribution of the test piece based on a distribution of at least one of a reflectance or a polarization characteristic on the main face of the test piece.

A method and system for measuring strain in a 3D printed part is disclosed herein. The printed part can be formed with internal features that can be analyzed with a digital image correlation system to determine strain levels in internal regions of the part. The features are visually identifiable due to a different color, shape, design or other visually distinguishable characteristics relative to that of the base structural material. The features can be the formed from the same material or a different material from that of the base structure material.

An example system to measure strain in an article includes a camera, a processor, and memory. The camera is to capture a plurality of images of the article. The processor and the memory are in selective communication with the camera. The processor and the memory are configured to determine strain in a region of the article based on a plurality of reference marks shown in the plurality of images.

A Bragg grating temperature sensor includes an optical fiber including a core, an optical cladding surrounding the core and a Bragg grating incorporated in the core and extending along a sensitive segment of the optical fiber. The core of the temperature sensor includes a core gap extending along a core gap segment of the optical fiber, the core gap segment being located in the vicinity of the sensitive segment. The optical cladding includes a cladding gap extending along a cladding gap segment of the optical fiber, the cladding gap segment including the sensitive segment.

A method of inspecting a secondary bond of a laminated part includes positioning the laminated part within a sealed chamber. The method also includes reducing a pressure within the sealed chamber to below a pressure outside the sealed chamber when the laminated part is positioned within the sealed chamber. The method further includes, when the pressure within the sealed chamber is reduced to below the pressure outside the sealed chamber, measuring a gradient of change of a surface profile of the laminated part. The method additionally includes determining a condition of the secondary bond based on the gradient of change of the surface profile of the laminated part.

The invention relates to an enveloping body for at least partially recording a contour of a limb, wherein the enveloping body has a base body, and at least one sensor that is configured to record measurement data which can be used to determine a distance and/or relative position between two points in or on the base body.