A system for an aircraft that includes a plurality of zones including: a first fiber optic cable routed through a zone of the plurality of zones. The first fiber optic cable is attached to a landing gear of the aircraft in the zone of the plurality of zones; and a first controller configured to provide a first optical signal to the first fiber optic cable and obtain a first optical response signal from the first fiber optic cable. The first controller is further configured to determine at least one temperature within the zone of the plurality of zones based on the first optical response signal, the first optical signal, and coherent optical frequency domain reflectometry (COFDR).

A system for monitoring of the resin front during resin infusion into a fiber preform for the manufacturing of composites. Such monitoring is based on Optical Frequency Domain Reflectometry by emitting light pulses through optic fibers which forms a resin infusion mesh in a fiber preform.

The present invention relates to a corrosion-fatigue-coupled test method and device for a steel bridge deck. The method includes: 1) installing an orthotropic steel bridge deck (OSBD) and pasting filter paper; 2) installing a sodium chloride solution delivery pipe; 3) installing an infrared (IR) lamp; 4) preparing a corrosive solution; 5) coupling corrosion and fatigue; and 6) acquiring test data. A device constructed by using the method includes a to-be-tested OSBD, a support device, a pressure pump, a water tank, a monitoring device, an IR lamp, a plastic water pipe, a thermostat and a rotary sprayer. The present invention solves the problem of laboratory accelerated corrosion of the OSBD. The present invention fully considers a coupling effect of a corrosive medium and an alternating stress, so that the created simulation environment is close to a service environment of the OSBD, and the test data are effective and reliable.

An apparatus and method for detecting composite material damage due to impact by using distributed optical fiber are disclosed. In the apparatus and method for detecting composite material damage due to impact by using distributed optical fiber, the position and level of damage occurring in a composite material due to low-velocity impact can be effectively and economically detected by measuring the residual strain of optical fiber distributed on the surface of the composite material or inside the composite material. In the apparatus and method for detecting composite material damage due to impact by using distributed optical fiber, there is no need to always operate a sensor in real time, so that detection errors due to temporary failures, malfunctions, etc. of the sensor, as well as a problem of constantly supplying power to the sensor, can be essentially removed.

Aspects of the present disclosure describe optical fiber sensing systems, methods and structures disclosing a distributed fiber sensor network constructed on an existing, live network, data carrying, optical fiber telecommunications infrastructure to detect temperatures, acoustic effects, and vehicle trafficamong others. Of particular significance, sensing systems, methods, and structures according to aspects of the present disclosure may advantageously identify specific network locations relative to manholes/handholes and environmental conditions within those manholes/handholes namely, normal, flooded, frozen/iced, etc.

Aspects of the present disclosure describe systems, methods and structures and applications of optical fiber sensing. Of significance, systems, methods, and structures according to aspects of the present disclosure may reuse and/or retrofit/upgrade existing optical fiber cables as part of optical fiber sensing that may find important societal application including intrusion detection, road traffic monitoring and infrastructure health monitoring. Combining such optical fiber sensing with artificial intelligence (AI) further enables powerful applications at low(er) cost.

A fiber composite component having an integrated structural health sensor arrangement includes a plurality of layers of fibers embedded in a matrix material, at least two rupture sensing fibers arranged on or in at least one of the layers, wherein the rupture sensing fibers are carbon fibers having an electrically insulating coating, and two electrical connection devices, each being accessible from an outer delimiting surface or an outer edge of the component, wherein the electrical connection devices are connected to different ends of the rupture sensing fibers.

Device for measuring the endogenous deformations of a structure of materials, during the transition of said structure from a liquid phase to a solid phase, comprising: a uniaxial test body suitable for being embedded in the structure; a deformation measurement fiber attached to the interior of the test body; a system connected to the measurement fiber and suitable for detecting signals representative of the deformations of the measurement fiber and for determining the endogenous deformations from these signals and from known mechanical properties of the materials of the test body, the test body having a rigidity comprised between 2 and 5 gigapascals.

A diagnosis apparatus includes a fiber optic sensor, a collection processor, and a self-diagnosis processor. The fiber optic sensor is configured to be disposed over a target. The collection processor is configured to perform a collection process that collects measurement data related to the target obtained by the fiber optic sensor. The self-diagnosis processor is configured to perform a self-diagnosis process before the collection processor starts the collection process. The self-diagnosis process obtains an output value related to calibration of the fiber optic sensor, causes the collection processor to start the collection process when the output value falls within a proper range, and outputs an error when the output value falls outside the proper range.

A method of measuring the state or condition of spatially spaced apart machine parts subject to wear and emitting an acoustic signature. The method includes: (a) optically sensing the acoustic properties of the machine parts subject to wear, and deriving sensed signals there from, (b) dividing the sensed signals into a first series of corresponding spatial segments along the spaced apart machine parts and, for each spatial segment, dividing the sensed signal into a temporal segment recording the acoustic properties for the spatial segment over an extended time period; (c) dividing each temporal segment into a series of sub-segments and frequency domain transforming the sub-segments into corresponding frequency domain sub-segments; (d) combining the frequency domain sub-segments within a spatial segment, to produce a corresponding lower noise level combined frequency domain sub segment; and (e) determining the fundamental frequency of the emitted acoustic signatures present in the combined frequency domain sub segment, and associated harmonics.