58results about How to "Increased strain sensitivity" patented technology

A telemetric tibial tray includes a lower plate that defines a plurality of cylindrical transducer cavities having circular load diaphragms. An upper plate is attached to the lower plate through support posts projecting from the load diaphragms. The support posts have a circular cross-section and a diameter of about 5.0 mm. The lower plate further defines wiring channels communicating between the transducer cavities and a central cavity housing the circuit board for the telemetric tray. The wiring channels are arranged at a 45 degree angle relative to the sagittal plane of the knee joint in order to reduce the effects of the wiring channel intersection on the strain sensitivity of the tray. Each transducer cavity includes a radial strain gage array with four pairs of radially aligned strain gages, each pair aligned at a 45 degree angle relative to the sagittal plane of the knee joint. Each pair of strain gages includes an inner gage positioned at the point of maximum positive micro-strain across the diaphragm when loaded, and an outer gage positioned at the point of maximum negative micro-strain, to thereby increase the differential strain measured by the gages and increase the strain sensitivity of the tibial tray.

The present invention relates to a system for sensing the curvature of a towed hydrophone array and a curvature sensor used in the system. The system has at least two curvature sensors positioned along the length of the array. Each of the curvature sensors comprises a bend member which bends as the array bends, at least one optical fiber within the bend member, and at least one detection device embedded within the at least one optical fiber to detect a change in the strain in the at least one optical fiber.

The invention provides a vibration transducer. Vibration beams are provided on a substrate in parallel with the substrate and in parallel with each other, and provided in vacuum chambers formed by a shell and the substrate. Each of vibration beams has a sectional shape with a longer sectional thickness in a direction perpendicular to a surface of the substrate than a sectional thickness in a direction parallel to the surface of the substrate. A first electrode plate is provided in parallel with the surface of the substrate and connected to one end of each of the vibration beams. A second electrode plate is provided in parallel with the surface of the substrate and between the vibration beams. Third and fourth electrode plates are provided on opposite sides of the vibration beams. Asperities are provided in opposed side wall portion surfaces of the vibration beams and the second, third and fourth electrode plates,

The invention provides a capacitive strain sensor and a preparation method thereof, which belong to the technical field of sensor design and production. The capacitive strain sensor consists of a substrate, a first barium strontium titanate dielectric film layer, a PdCr electrode layer, a second barium strontium titanate dielectric film layer, and an Al strontium barium titanate dielectric film layer from bottom to top. 2 o 3 The protective layer, wherein the PdCr electrode layer is an interdigitated electrode structure. The present invention adopts the planar structure of interdigitated capacitance, and barium strontium titanate (Ba 0.5 Sr 0.5 TiO 3 ) as the dielectric material, PdCr as the electrode material, and the preparation technology of magnetron sputtering coating and photolithography technology are used to realize the higher temperature (500℃) of the capacitive strain sensor under the larger strain (2500με). The purpose of stabilizing work.

The invention discloses an aramid nanofiber / polyvinyl alcohol / polyaniline composite hydrogel, a preparation method and application thereof. The composite hydrogel is prepared by in-situ polymerizing polyaniline under acidic conditions with aramid fiber nanofiber and polyvinyl alcohol hydrogel as the matrix. Under the interaction of various hydrogen bonds, the mechanical strength and toughness of the composite hydrogel are significantly improved. At the same time, due to the presence of conductive polyaniline, the composite hydrogel of the present invention has high sensitivity, and can repeatedly and stably detect changes in electrical signals in practical applications. The composite hydrogel of the invention has high mechanical strength, high toughness and high sensitivity, and is suitable for the field of wearable strain sensors.