5results about How to "Increased strain sensitivity" patented technology

The invention discloses a fiber-type sensor with adjustable strain sensitivity and sensing range and a preparation method thereof. The fiber-type sensor realizes strain resistance response of basic sensitivity through bulk resistance change caused by cross sectional area change of a conductive material layer when the fiber-type sensor is stretched and an expansion effect of microcracks on the surface of the conductive material layer. The preparation method of the fiber type sensor comprises the following steps: extruding a thermoplastic polyurethane organic solution into a water bath by using an injector to obtain a phase separation porous core fiber 1; immersing the core fiber into an organic solution containing a thermoplastic polyurethane and carbon nanotube mixture, taking out the core fiber, and transferring the core fiber to a non-woven fabric substrate; the substrate and the coated core fiber on the substrate are integrally placed in a water bath and then taken out, and the sensing fiber is obtained after the fiber is stripped; a metal foil packaging layer or a polymer packaging layer is used for wrapping fibers in a segmented mode, and the fibers are pre-stretched to form the fiber type sensor with sensing efficiency.

The invention discloses an integrated optical fiber sensor for measuring temperature strain at extreme high temperature, and the sensor comprises a crystal optical fiber which comprises a first optical fiber segment, a second optical fiber segment and a third optical fiber segment which are connected in sequence; the first optical fiber grating is formed in the first optical fiber section of the crystal optical fiber; the second optical fiber grating is formed in the second optical fiber section of the crystal optical fiber; wherein the diameters of the first optical fiber section and the third optical fiber section are the same, and the diameters of the second optical fiber section are different from those of the first optical fiber section and the second optical fiber section. The integrated optical fiber sensor can measure the temperature and the strain at the same time in an extremely high temperature environment. The invention further discloses a preparation method of the integrated optical fiber sensor.

This invention discloses an FBG strain sensor based on misaligned fusion spliced ​​coreless optical fiber and its fabrication method. The sensor comprises an input single-mode fiber, multiple segments of coreless optical fiber, and an output single-mode fiber connected sequentially. The input single-mode fiber is fused together with the first segment of the coreless fiber in a misaligned manner, and the next segment of the coreless fiber is fused together with the previous segment in a misaligned manner, with the misalignment direction of the next segment opposite to that of the previous segment, but the misalignment distance being the same. The output single-mode fiber and the last segment of the coreless fiber are fused together axially. The central axes of the input and output single-mode fibers are collinear, and the cores of the input and output single-mode fibers are connected by a photolithographically written straight waveguide. A fiber Bragg grating is then optically etched along the straight waveguide. This invention uses femtosecond lasers to fabricate the FBG on the misaligned fiber structure, increasing the structure's strain response and making the strain sensitivity of the FBG on this structure higher than that of an FBG fabricated on ordinary silica optical fiber.

The invention belongs to the technical field of pressure sensors, and particularly relates to a flush membrane core, a preparation method and application thereof, and a pressure transmitter. The flush membrane core body comprises a steel base and a flush membrane; wherein the flush membrane comprises a composite strain layer; the composite strain layer comprises a first strain layer, a second strain layer, a third strain layer and a fourth strain layer which are stacked in sequence, and the first strain layer, the second strain layer, the third strain layer and the fourth strain layer cooperate with one another to sense pressure from all directions, so that the strain sensitivity of the flush membrane core is improved. The pressure transmitter containing the flush membrane core body provided by the invention has very high overload capacity, so that the pressure transmitter can keep stable performance in a severe working environment and provide accurate pressure data.

The invention discloses a thick-film resistor with high strain sensitivity and low temperature sensitivity and a preparation method thereof, and belongs to the technical field of functional materials, electronic elements and sensors. The preparation problem of the thick-film resistor with high strain sensitivity and low resistance temperature coefficient is solved. The preparation method comprises the following steps: weighing lead oxide, boron oxide and silicon dioxide, uniformly mixing, completely melting into molten glass, carrying out water quenching, and carrying out ball milling on the water-quenched glass slag to obtain lead borosilicate glass powder; weighing RuO powder and lead borosilicate glass powder, adding an organic carrier, mixing, adding into a three-roller grinder, and fully grinding to be fine and uniform, so as to obtain resistance paste; and coating a cleaned substrate with the resistance paste in a silk-screen printing manner, and in an air atmosphere, controlling the sintering peak temperature within the range of 750-950 DEG C and the heat preservation time of the sintering peak temperature within the range of 10-360 minutes to obtain the thick-film resistor with both high strain sensitivity and low temperature sensitivity.