A method of optical sensing is disclosed. The method comprises coupling an excitation optical signal into a first optical fiber to induce Rayleigh backscattering, thereby providing a backscattered signal; coupling the backscattered signal into a second optical fiber, spatially separated from the first optical fiber; and optically amplifying the backscattered signal in the second optical fiber, thereby generating a sensing signal.

Optical fiber sensor systems for monitoring environmental impacts in downhole systems are provided. The optical fiber sensor systems include an optical fiber arranged along a downhole tool, the optical fiber having a first end and a second end, a light source coupled to the first end of the optical fiber and configured to project light into and along the optical fiber, a photodetector coupled to the first end of the optical fiber and configured to monitor light reflected along and through the optical fiber, and at least one sensing element arranged on the optical fiber, the at least one sensing element arranged to change a light property of the optical fiber, wherein a change in the light property of the optical fiber occurs based on exposure of the at least one sensing element to an environment of a region of interest.

A resin impregnation detection device configured to detect resin impregnation in a resin impregnation process for a coil insulation layer. The resin impregnation detection device can be inserted in a narrow portion, is capable of detecting impregnation with a liquid resin, and does not leave metal foreign materials other than an optical fiber in a product even after the resin impregnation. The resin impregnation detection device includes an optical fiber including an FBG sensor, and a coating resin, which coats the FBG sensor. The coating resin includes a resin to be softened by contact with a detection target resin. The FBG sensor is applied with a compressive strain caused by cure shrinkage of the coating resin or heat shrinkage thereof from a curing temperature to a normal temperature.

A linear actuation screw having a first end portion, a second end portion on an opposite side as the first end portion, and a sloping intermediate portion between the first end portion and second end portion. The first end portion has a threaded outer wall having a generally constant first diameter over at least a portion of its length and is configured to advance a nut or a sliding member along at least a portion of the first end portion. The second end portion has a threaded outer wall having a generally constant second diameter that is different from the first diameter and is configured to receive a motor fastening nut around it in order to secure the linear actuation screw to a motor. The sloping intermediate portion includes an outer wall that is generally smooth and continuous over at least a majority of the area of the outer wall.

According to examples, an optical fiber-based sensing membrane may include at least one optical fiber, and a substrate. The at least one optical fiber may be integrated in the substrate. The substrate may include a thickness and a material property that are specified to ascertain, via the at least one optical fiber and for a device that is contiguously engaged with a surface of the substrate, includes the substrate embedded in the device, or includes the surface of the substrate at a predetermined distance from the device, a thermal and/or a mechanical property associated with the device, or a radiation level associated with a device environment.

A honeycomb sandwich structure formed of face skin materials made of fiber reinforced plastics and a honeycomb core has a structure in which an optical fiber sensor structure is embedded in an adhesive layer formed between the face skin materials and the honeycomb core. With this, it is possible to provide a honeycomb sandwich structure and a method of manufacturing the honeycomb sandwich structure that enable precise thermal control to be implemented even when a thermal control device is bonded onto a surface of the honeycomb sandwich structure and enable evaluation of a temperature with high resolution and high accuracy.

A new compact, scalable, self-contained, highly efficient computer system comprised of stackable microchips within a thermal vessel. The power fed to this computer system is simultaneously transmitted directly & via a tuned resonance frequency to and through each stacked microchip and regulated via several feedback sensory coils. Inductive transceiver coils established within the microchip condition and redistribute power to its adjacent chipset. Fiber optics & power cables are located within the photonic tubular core to allow gated communication between stacked microchips. Alignment and separation of said microchips is maintained by controlled magnetic & electromagnetic poles.

A fiber optic sensor device comprising an optical fiber with a multilayer coating on the optical fiber at least in a fiber section of the optical fiber. The multilayer coating comprises a chrome layer on the optical fiber, a metal layer such as a copper layer on the chrome layer and an indium or lead layer on the metal layer. The indium or lead layer having a thickness larger than thicknesses of the chrome and metal layers, preferably with a thickness about equal to the radius of the optical fiber.

A vibration sensing optical fiber cable is provided. The cable includes at least one optical fiber embedded in the cable jacket such that vibrations from the environment are transmitted into the cable jacket to the optical fiber. The cable is configured in a variety of ways, including through spatial arrangement of the sensing fibers, through acoustic impedance matched materials, through internal vibration reflecting structures, and/or through acoustic lens features to enhance sensitivity of the cable for vibration detection/monitoring.

The invention relates to an absolute position measuring device, comprising an optical fiber, an optical strain sensor in optical communication with the optical fiber, and a volume of material deforming under influence of a magnetic field. The optical strain sensor is arranged for sensing deformation of the volume of material. Further, the device is arranged for multi-dimensional position measurement.