38results about How to "High sensitivity factor" patented technology

The invention discloses a bionic stress sensing structure and a formation method thereof. According to the bionic stress sensing structure, a conducting ink layer with strip-shaped parallel slit bands is formed on a paper substrate. The conducting ink layer is compact and rigid while the paper substrate is porous and soft. The formation method of the bionic stress sensing structure includes printing a layer of conducting ink on the paper substrate, wherein the conducting ink forms the dry conducting ink layer which is compact and rigid after drying up; and bending the paper substrate so as to make the dry conducting ink layer to break in the bending process. In this way, a plurality of slits are formed in the dry conducting ink layer and the slits form the slit band bionic structure. The dry conducting ink layer becomes the conducting ink layer with the strip-shaped slit bands, so that the bionic stress sensing structure is formed. When the paper substrate is stressed and deformation occurs, the contact degree of the slit walls of the strip-shaped slits of the slit band bionic structure changes, so that the resistance of the conducting ink layer varies. Therefore, the stress sensing function is achieved.

The invention relates to a flexible strain transducer based on carbon nanofiber yarn woven fabric and a preparation method thereof. The preparation method includes the following steps: uniformly spreading a polymer solution or a liquid polymer, and drying the polymer solution or the liquid polymer to prepare base film; connecting the carbon nanofiber yarn woven fabric with extraction electrodes, infiltrating the carbon nanofiber yarn woven fabric into the polymer solution or the liquid polymer, placing the carbon nanofiber yarn woven fabric on the base film, and performing drying treatment; applying the polymer solution or the liquid polymer to the surface of the carbon nanofiber yarn fabric once, and preparing the flexible strain transducer based on the carbon nanofiber yarn woven fabricthrough drying. Final products include the carbon nanofiber yarn woven fabric, two extraction electrodes communicating with the carbon nanofiber yarn woven fabric, and polymer film covering the upperand lower surface of the carbon nanofiber yarn woven fabric. A sensitivity coefficient of is 30-200 when cyclic stretch is performed at elongation ranging from 0 to 5-12%; and a linear correlation coefficient is more than or equal to 0.995 when the elongation is 9% or below when stretch is performed. The preparation method is simple in a process, and low in cost.

The invention relates to a graphene-based piezoresistive pressure sensor and a preparation method thereof. The preparation method of the sensor comprises the following steps of preparing a graphene film on a metal substrate to form a metal/graphene film; coating PMMA on the surface of the graphene film to form a metal/graphene film/PMMA; carrying out bubbling and stripping on the graphene film coated with the PMMA on the metal substrate by an electrochemical method in order to obtain the graphene film/PMMA; transferring the graphene film/PMMA to an SiO2/Si substrate and removing the PMMA to obtain the graphene film/SiO2/Si; transferring the graphene film/SiO2/Si to an SiC substrate; etching the SiO2/Si substrate; patterning the graphene film; and evaporating a metal electrode on the graphene thin film to obtain the graphene-based piezoresistive pressure sensor. The graphene-based piezoresistive pressure sensor has the characteristics of good piezoresistive property, high sensitivity and fast response speed, and has wide market application value and prospect.

The invention discloses a self-compensating concrete integrated strain gauge, which is mainly characterized in that a compensation resistor is provided on the strain gauge, the compensation resistor and the working piece form a half-bridge or full-bridge working mode, and the compensation resistor adopts a high-precision resistor with no stress output Or small grid strain gauges, which can automatically compensate the influence of temperature on the bridge and wires, overcome the difficulty that it is impossible to equip each measuring point with a compensation block and ensure that its temperature and change are consistent; it can also eliminate the influence of wire length on detection sensitivity At the same time, the reinforced fiber insulation base and flexible waterproof sealing material are used to carry out the overall waterproof sealing treatment, which not only ensures the technical requirements of the insulation resistance of the strain gauge, but also has the effect of convenient, fast, accurate and safe on-site installation. .

The invention discloses a contact stress sensor. The contact stress sensor comprises a flexible supporting base, a strainmeter, a flexible transmission line and a flexible medium, wherein the flexible supporting base is provided with a plurality of through holes and located at the bottommost position, the strainmeter and the flexible transmission line adhere to the upper surface of the flexible supporting base after being connected into a whole in a lead bonding mode, and the flexible medium covers and adheres to the upper surface of a combination of the strainmeter and the flexible transmission line. Due to the adoption of the flexible supporting base, the flexible transmission line and the flexible medium, the contact stress sensor is capable of bending and deforming along with changes of installation environments, and particularly applicable to measuring contact stress of an upper contact surface and a lower contact surface of an article located in a curved surface structure; due to the fact that the through holes are formed in the supporting base, the contact stress sensor can be used for measuring not only pulling stress but also compressive stress, and measuring accuracy is enhanced.

The invention provides a hydrogen sulfide gas sensing device on the basis of an optical fiber F-P (Fabry-Perot) interferometer. The concentration of external hydrogen sulfide gas can be perceived by an optical fiber F-P cavity of the hydrogen sulfide gas sensing device which is a measuring device, and the optical fiber F-P cavity is formed by an optical fiber collimator and a metal groove filled with hydrogen sulfide sensitive organic polymer materials. The refractive index of the organic polymer materials can be changed when the concentration of the external hydrogen sulfide gas is changed, optical paths of transmitted optical waves in the optical fiber F-P cavity can be changed, and accordingly spectral characteristics of interference signals outputted by the optical fiber F-P cavity can be changed. Data of the spectral characteristics of the reflected interference signals of the optical fiber F-P cavity are analyzed, so that the concentration of the hydrogen sulfide gas can be accurately measured. The hydrogen sulfide sensing device has the advantages of simple structure, miniaturization, high sensitivity and precision, electromagnetic interference resistance, intrinsic safety and the like.

The invention relates to the technical field of strain sensors, and provides a multilayer structure strain sensor with high sensitivity, which comprises a sensor body that comprises a first thin film layer, the first thin film layer is connected with a second thin film layer, and the second thin film layer far away from the first thin film layer is connected with a third thin film layer, wherein cavities are formed among the first thin film layer, the second thin film layer and the third thin film layer, and a strain core area is arranged on the first thin film layer; The second thin film layer enables the first thin film layer and the third thin film layer to be indirectly connected; the rigidity of the strain core area on the first thin film layer is lower than the rigidity of the areas on the two sides by combining with the parameter design of the strain core area, so that larger strain is generated on the strain core area of the first thin film layer. Therefore, even if the deformation of the measured object is small, the accurate measurement requirement can be met.

The invention relates to a strain sensor for weft knitted fabric and a knitting method. The sensor comprises a sensing area and connecting areas. The sensing area comprises plain plaiting coils using face yarn as the conductive yarn and using ground yarn as the elastic yarn. The connecting areas are located at two sides of the sensing area. The connecting areas comprise plain plaiting coils using face yarn as the yarn and the ground yarn as the elastic yarn. Edge locking areas are located at the outer sides of corresponding connecting areas. The edge locking areas comprise plain plaiting coils using face yarn as the yarn and the ground yarn as the elastic yarn, wherein, the face yarn is exposed at the front sides of the sensing area, connecting areas and edge locking areas, and the ground yarn is exposed at the back sides of the sensing area, connecting areas and edge locking areas. The conductive yarn in the sensing area is in a bending structure. The sensor has a good extendability and elastic recovery, the equivalent resistance in the curved sensing area is larger than a rectangular area indicating the sensor has a high sensitivity coefficient.

The invention provides a preparation method and application of a large strain superelastic PVA/MCNTS(multi-walled carbon nanotube) hydrogel. The preparation method comprises the following steps: 01. preparing disordered MCNTS powder by chemical vapor deposition; 02. acidifying, separating, drying and grinding the MCNTS powder; 03. preparing a PVA aqueous solution, adding the MCNTS powder treated in the step 02 into the PVA aqueous solution, and heating and stirring in a water bath to fully disperse the MCNTS powder to prepare a PVA/MCNTS mixed solution; and 04. pouring the PVA/MCNTS mixed solution in the step 03 into a mold, and then freezing and thawing for many times to obtain the PVA/MCNTS hydrogel. The polyvinyl alcohol/multi-walled carbon nanotube hydrogel prepared by the method has uniform components, has large tensile strain and compressive strain at the same time, and has superelasticity and sensitivity factors in the tensile process and the compression process. Due to excellent performance, the hydrogel can be used as a strain sensor in the field of flexible stretchable devices.

The invention provides a pressure column pressure roller shaft structure with a built-in pressure sensor, which includes a pressure roller shaft body, two coaxial but non-penetrating sensor holes are arranged on the pressure wheel shaft body in the radial direction, and a sensor hole is arranged between the two sensor holes A radial threading hole in which two sensor holes are connected together; an axial threading hole is arranged in the axial direction between one end of the pressure roller shaft body and one of the sensor holes or the radial threading hole; a pressure threading hole is pasted on the side walls of the two sensor holes respectively. For the strain gauge, two wires are inserted into the axial threading hole from one end of the pressure roller shaft body, and are respectively welded to the joints of the two pressure strain gauges. The present invention adopts the pressure strain gauge as the pressure sensor, which has the characteristics of large sensitivity coefficient and extremely small mechanical hysteresis; the pressure sensor and the pressure wheel shaft are integrated, the structure is simple, the size is small, and the installation is convenient; the mechanical connection structure of the traditional sensor is eliminated, avoiding The error caused by mechanical connection is eliminated, and the accuracy and feedback speed of pressure detection are improved.

The invention provides a device for melting a thermo-sensitive film master batch by adopting a form of a vacuum tank. The device for melting the thermo-sensitive film master batch comprises a fixed frame, a nitrogen inlet pipe, a circulation chamber, a three-level pressurizing chamber and a vacuum chamber. The fixed frame is installed on a wall. A tank body is fixed to the middle of the fixed frame. The three-level pressurizing chamber is controlled by a hydraulic rod above the fixed frame. The vacuum chamber is arranged in the circulation chamber. The gas inlet end of the nitrogen inlet pipe is arranged on the three-level pressurizing chamber. The gas outlet end of the nitrogen inlet pipe is directly connected with a gas inlet of the vacuum chamber. The tail end of the circulation chamber is further provided with a wind suction implement. According to the device for melting the thermo-sensitive film master batch, the form of the vacuum tank is adopted for melting the thermo-sensitive film master batch, so that the thermo-sensitive film master batch does not contain impurities of air any more, and accordingly the quality and the sensitivity coefficient of a finished film is effectively improved.

The invention discloses a pressure sensor with long service life and high sensitivity. The pressure sensor comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a transistor T1, a transistor T2, a diode D1, a diode D2 and a capacitor C, wherein the resistor R1, the resistor R2, the resistor R4 and the resistor R3 are sequentially connected to one another in series to form a closed loop; a common terminal of the resistor R2 and a common terminal of the resistor R3 are sequentially connected with an emitting electrode of the resistor R7, an emitting electrode of the diode D2 and an emitting electrode of the transistor T1; a base electrode of the transistor T1 is connected with a common terminal of the resistor R3 and a common terminal of the resistor R4; a collector electrode of the transistor T1 is sequentially connected with the resistor R5 and a power source VCC; an emitting electrode of the transistor T1 is connected with an emitting electrode of the transistor T2; a base electrode of the transistor T2 is sequentially connected with a common terminal of the capacitor C, a common terminal of the resistor R1 and a common terminal of the resistor R2 in series; a collector electrode of the transistor R2 is sequentially connected with the resistor R6 and the power source VCC in series; and a negative electrode of the diode D1 is connected with a common terminal of the resistor R1 and a common terminal of the resistor R3. By using the principle, the pressure sensor is simple in structure, high in sensitivity, high in pressure resolution ratio, high in overall precision and long in service life.