382results about "Force measurement using piezo-resistive materials" patented technology

The invention provides a data error compensation method for a biological net port flowmeter, and belongs to the technical field of ocean detection. A multi-dimensional sensor is arranged at a biological net port to collect fluid parameters, a deep learning model is used for recognizing multi-phase flow characteristics, and a corresponding compensation strategy is selected; based on a correlation analysis algorithm, compensation processing frequency is dynamically adjusted to achieve self-adaptive balance of precision and efficiency, the flow state change degree is monitored through the Euclidean distance, compensation parameters are hierarchically adjusted to ensure system stability, a parallel processing architecture is adopted to execute coarse compensation and fine compensation algorithms at the same time, and results are fused according to weights. Finally, dynamic and accurate compensation of the measurement error of the biological net port flowmeter in the complex multiphase flow environment is achieved, and the technical problem that in the prior art, the biological net port flowmeter cannot achieve dynamic and accurate error compensation in the complex multiphase flow environment is solved.

The invention relates to the technical field of flexible sensors, in particular to a gradient hierarchical porous structure flexible piezoresistive sensor and a preparation method thereof. The sensor is of a laminated structure and comprises an upper flexible packaging protection layer, a lower flexible packaging protection layer, a conductive fabric electrode and a middle piezoresistive sensing layer, and a limiting frame is arranged on the periphery of the sensor. The sensing layer is prepared by adopting a 3D printing ink direct writing technology, and adopted printing slurry takes silicone rubber as a matrix and is uniformly mixed with expanded conductive microspheres and conductive filler. The printing wires are stacked in order to form a macroscopic gradient porous network structure; after the expanded microspheres are subjected to in-situ foaming, micro closed pores are formed in the material, and a rough microstructure is constructed on the surface of the wire material, so that hierarchical multi-scale regulation and control of a conductive network are realized cooperatively, contact sites are increased remarkably, and the sensitivity of the sensor is further improved effectively. The flexible piezoresistive sensor prepared by the invention has the advantages of high sensitivity, wide pressure detection range and high linearity, and has the commercial values of simple preparation process, high repeatability, lower cost and the like.

A force sensor comprising a contact arrangement for transmitting a contact force to a force sensor assembly. The force sensor assembly comprising a first sensor sensing, and producing an output from, a normal contact force component of the contact force; and a body moveable on transmission of the contact force to the force sensor assembly; and a second sensor for sensing, and producing an output from, a relative displacement of the body relative to the second sensor, the a tri-axis contact force being determined from the relative displacement.

The invention relates to the technical field of ice engineering measurement, and discloses an underwater special-shaped structure surface floating icebreaking load spatial and temporal distribution test system, which comprises a flexible high-density distributed pressure sensor array, a high-speed synchronous data acquisition module, an underwater data transmission system and a shore data processing platform, the flexible high-density distributed pressure sensor array is attached to the surface of an underwater target special-shaped structure; the high-speed synchronous data acquisition module is mounted in a sealed cabin in the special-shaped structure of the underwater target, is close to the flexible high-density distributed pressure sensor array and is used for digitalization; the underwater data transmission system is used for communication between the high-speed synchronous data acquisition module and the ashore data processing platform; and the ashore data processing platform is used for reconstructing and visually displaying the pressure field of the special-shaped structure of the underwater target. According to the method, more comprehensive and accurate ice-structure interaction load information can be obtained, and fine structure design is served.

The invention relates to a low-noise high-precision pressure measuring circuit which comprises a bridge type sensor, an alternating-current excitation signal source, a phase-sensitive detector, a low-pass filter, a reference signal source and a signal conditioning amplifier. The alternating current excitation signal source modulates a differential voltage signal generated by the bridge type sensor to a high-frequency alternating current excitation signal generated by the alternating current excitation signal source to obtain a high-frequency pressure signal; the high-frequency pressure signal is amplified by the signal conditioning amplifier to form a modulated signal; the phase-sensitive detector performs frequency mixing on the modulated signal and a reference signal generated by a reference signal source to obtain a frequency mixing signal; the frequency mixing signal is filtered by a low-pass filter to form a direct-current voltage signal for pressure measurement; the reference signal generated by the reference signal source and the high-frequency AC excitation signal generated by the AC excitation signal source have the same frequency. According to the circuit, signals are modulated to a high-frequency area with low noise energy to be processed by adopting alternating-current excitation and coherent detection technologies, the signals and noise are effectively separated, and extremely high measurement resolution and precision are achieved.

A pressure and force sensor and method of fabrication for the implementation of the sensor is presented that employs piezoresistive elements having high gauge factors. Example embodiments allow for the implementation of a pressure or force sensing device and method of fabrication that can be tailored to the requirements of a wide range of applications without incurring long development times and high costs. The pressure or force sensor has an unprecedented level of sensitivity and can be used to measure extremely low levels of pressure and force, or alternatively to measure extremely high levels of pressure and forces. Moreover, the example embodiments teach pressure and force sensors suitable for use in harsh environments and can be operated at high temperatures.

A sensor unit (4) for monitoring connectable components is proposed, comprising a base unit (5), an electrode layer (6), and a sensor layer (7). The electrode layer (6) is formed on the base unit (5) and has at least one electrode in electrical contact with the sensor layer (7). Furthermore, the sensor layer (7) is formed on a side of the electrode layer (6) facing away from the base unit (5) and is made of a piezoresistive material such that a change in electrical resistance in the sensor layer (7) can be induced by a mechanical force.

The invention discloses an anti-pinch control method and device for vehicle moving parts, the method and device are applied to a vehicle, the vehicle comprises a plurality of moving parts corresponding to different anti-pinch areas, and the method comprises the steps that a target moving part and a target anti-pinch area corresponding to a moving part control instruction are obtained, acquiring an anti-pinch sensitive coefficient matrix corresponding to the piezoresistive sensor array in the target anti-pinch area, and acquiring a voltage fluctuation matrix acquired by the piezoresistive sensor array arranged in the target anti-pinch area in the process of controlling the target moving part according to the moving part control instruction, and according to the anti-pinch sensitive coefficient matrix and the voltage fluctuation matrix, determining pinch risk information, and if there is a pinch risk, controlling the target moving part according to the reverse control instruction to remove the pinch risk of the target anti-pinch area. According to the application, the risk difference of different positions is reflected through the anti-pinch sensitivity coefficient matrix, and anti-pinch control matched with real risks can be realized.

The invention discloses a flexible multi-dimensional force sensing device, comprising a first insulator having a plurality of three-dimensional structures protruding from the surface; the first conductor is made of a flexible conductive material and is in the shape of long-strip stitches, the stitches are connected with one another to form a conductive network, the stitches are adhered to the surface of the first insulator and distributed on the surface of the three-dimensional structure unit, and the three-dimensional structure unit is used for transmitting borne normal pressure, shear force and torsional force to the corresponding stitches; the first conductor has a piezoresistive effect, when the first conductor is stressed to generate elastic deformation, the stitch is stretched or compressed, and the resistance at the stressed position changes regularly; and connecting each trace of the first conductor to an external electrical impedance scanning imaging device so as to detect pressure information of each position on the surface of the flexible multi-dimensional force sensing device at each moment. On the basis, the flexible multi-dimensional force sensing equipment is simple in structure, low in cost, easy to process, good in fitting degree for a curved surface shape, and excellent in stability and robustness.

The invention discloses a piezoresistive array sensor and a manufacturing method thereof, the piezoresistive array sensor comprises a first flexible substrate layer, a conductive pattern layer, a pressure-sensitive layer, a sealing glue layer and a second flexible substrate layer, the first flexible substrate layer comprises a plurality of independently arranged island-shaped structures, the neck structure is connected with the adjacent island-shaped structures and is provided with a first hole groove; the sealing glue layer comprises hollowed-out grooves, air channel grooves and second hole grooves which are arranged in a communicating mode, the hollowed-out grooves are used for containing the pressure-sensitive units of the pressure-sensitive layer, the air channel grooves are connected between the adjacent hollowed-out grooves, and the second hole grooves are formed in the paths of the air channel grooves; the second flexible substrate layer is arranged on the side, away from the first flexible substrate layer, of the sealing glue layer, a third hole groove is formed in the second flexible substrate layer, and the third hole groove is sequentially communicated with the second hole groove and the first hole groove. The piezoresistive array sensor has high-sensitivity and high-stability pressure detection capability, and can adapt to flexible application scenes such as bending and folding.

The invention discloses an intelligent contrast agent exosmosis prevention monitoring device, and relates to the technical field of medical instruments, in particular to an intelligent contrast agent exosmosis prevention monitoring device which comprises a flexible substrate. A biological impedance sensor, a temperature sensor and a micro pressure sensor are integrated on the flexible substrate and used for monitoring tissue impedance, skin temperature and tissue pressure changes of an injection part in real time in a multi-parameter mode. The device is internally provided with a signal conditioning circuit for processing sensor signals, and data are sent to the high-pressure injector through the wireless communication module. According to the method, the risk of exosmosis of the contrast agent can be recognized in an early stage through multi-parameter fusion analysis, and the instruction is automatically sent to the high-pressure injector to adjust or stop injection when the risk is abnormal, so that closed-loop feedback from monitoring to control is realized, and the injection safety is effectively improved.

The invention discloses a self-calibration flexible pressure sensing device, which comprises a first conductor and a second conductor which are in a strip-shaped, strip-shaped or linear structure and both have a piezoresistive effect. The isolating layer is arranged between the first conductor and the second conductor, and through holes or long grooves with continuous through holes are distributed in the surface of the isolating layer; and an encapsulation layer covering the first conductor and the second conductor. According to the embodiment of the invention, a dual-core layer piezoresistive structure and a through hole type isolation layer design are adopted, the dual-core layer design covers a range from small pressure to large pressure, the range limitation of a single material is broken through, and a dynamic self-calibration technology is combined, so that multi-parameter integrated detection of pressure magnitude, position and width is realized; the sensor array has the advantages of self-adaption to environment change, wide-range detection, multi-scene applicability and the like, the sensor for realizing the functions only needs four wires, complex wiring of the sensor array is avoided, miniaturization and flexibility are facilitated, a narrow strip-shaped flexible structure is adopted as a whole, and flexible arrangement of sensor tracks and garment integration are facilitated.

In certain examples, methods and semiconductor structures are directed to a force-sensing apparatus (e.g., synthetic skin) comprising an electrode layer and a plurality of deformation-recoverable microstructures in a dielectric region adjacent the electrode layer. In various examples, the deformation-recoverable microstructures are at randomly configured (e.g., in terms of morphology and / or spatial distribution) and, as in a capacitive-type sensor, the dielectric region may include a dielectric layer between a pair of electrode layers and with the dielectric layer and / or at least one of the electrode layers having such deformation- recoverable microstructures integrated into a surface and extending in a direction to sense forces applied towards or against the force-sensing apparatus.

The invention belongs to the technical field of flexible electronics, and relates to a flexible piezoresistive sensor based on an MXene multilevel heterostructure and a preparation method of the flexible piezoresistive sensor. The method comprises the steps that MXene nanosheets are attached to the surface of a thermoplastic polyurethane nanofiber substrate through electrostatic self-adsorption, a nanofiber composite layer is obtained, UIO-66-NH2 is dispersed in the thermoplastic polyurethane nanofiber substrate, and the surface of the thermoplastic polyurethane nanofiber substrate is modified with a first chitosan modification layer; the MXene nanosheets are embedded into the three-dimensional network of the polyurethane foam skeleton through dipping and extruding operation, a porous foam composite layer is obtained, and the surface of the polyurethane foam skeleton is modified with a second chitosan modification layer; and combining the nanofiber composite layer and the porous foam composite layer through a conductive adhesive containing silver paste, and carrying out packaging treatment to form the MXene multistage heterostructure with tightly combined interfaces. Based on the method, through the synergistic effect of the multistage heterostructures, high sensitivity, wide pressure detection range and high stability are realized at the same time.

The invention discloses a signal acquisition system and acquisition method for pressure sensors, the signal acquisition system comprises an excitation signal generation module, a first gating module, a second gating module, a gain adjustment module and a control module, the second gating module is matched with the first gating module, so that a plurality of pressure sensors respectively output first response signals; the gain adjusting module adjusts the multiple of the first response signal and outputs a second response signal; the control module receives the second response signal, controls the excitation signal generation module to adjust the excitation signal according to the second response signal, and controls the gain adjustment module to adjust the multiple so as to adjust the second response signal; according to the technical scheme, the excitation intensity and the amplification factor are dynamically adjusted according to the response signal collected each time, and the problem that in the prior art, signal collection is too weak or saturated due to the fact that the resistance change range of a pressure sensor is large is solved.

The present application belongs to the field of aviation ground test technology, and provides a rotorcraft take-off safety diagnosis and lift measurement device, which comprises a main take-off platform, a force balance, a vibration acceleration sensor, an information acquisition system and a computer loaded with a weight gravity center calculation program and a rotor dynamic balance program, wherein the main take-off platform is flush with the runway as a rigid take-off platform of the rotorcraft, a frame balance structure is fixedly connected below the main take-off platform and a force balance capable of measuring force in the circumferential direction is arranged below the main take-off platform, a vibration acceleration sensor is arranged on the lower surface of the main take-off platform, a strain gauge is arranged on each force bar of the force balance, the information acquisition system acquires data of the vibration acceleration sensor and the strain gauge and sends the data to the computer for calculation of the weight gravity center and rotor dynamic balance of the rotorcraft. The device can automatically measure the weight gravity center of the rotorcraft, and can accurately evaluate the weight gravity center and rotor dynamic balance level before take-off after the rotorcraft is normally started.

The utility model relates to the technical field of bionic pressure sensors, in particular to a broadband wide piezoresistive sensing structure simulating scorpion threshold response characteristics, which comprises a threshold adjusting structure and a piezoresistive sensing unit. The threshold value adjusting structure comprises a flexible deformation cover and a threshold value sensing structure base, the flexible deformation cover covers the top end of the threshold value sensing structure base, the piezoresistive sensing unit is arranged in the threshold value sensing structure base, and a rectangular through groove is formed in the bottom of the threshold value sensing structure base; a threading hole is formed in the side wall of the threshold sensing structure base; the flexible deformation cover comprises a sheet, and the center of the lower surface of the sheet is integrally connected with an inverted-cone-shaped protruding block. The problems that the inherent contradiction exists between the sensitivity and the bandwidth performance of an existing piezoresistive sensor, in particular, structural instability under large signals is easily caused when the sensitivity is improved through a traditional design, and the response capacity to small signals is greatly reduced by increasing rigid support to expand the measuring range are solved.

The application discloses a thermodynamic dual-mode composite sensitive material, a preparation method and application thereof. The composite sensitive material comprises a matrix, has a three-dimensional porous structure, and comprises a polymer material and a sheet-shaped non-metallic conductive material; and metal oxide nanoparticles are distributed on the surface of the sheet-shaped non-metallic conductive material; wherein the sheet-shaped non-metallic conductive material and the metal oxide nanoparticles are both materials with negative thermoelectric coefficients. The thermodynamic dual-mode composite sensitive material provided by the application integrates pressure sensing and thermoelectric performance, which avoids the problems of complex layout and complex signal transmission of a traditional dual-mode sensor; meanwhile, the pressure sensing and the thermoelectric sensing are not interfered with each other, so that the prepared sensor has the advantages of signal non-interference decoupling, avoidance of wear failure, strong adaptability, non-destructiveness, high safety and the like, can adapt to a higher temperature, and has stable temperature signal output.

Sensor device 1 for spatially resolved determination of the position of a pressure application 9, with a circuit carrier 2, wherein the circuit carrier 2 has a deformable connecting material 3 with conductive particles 4 for electrical connection of rows 5 and columns 6, wherein the circuit carrier 2 has on one planar side a row structure 5 as a first contact structure 5 with several individual electrically conductive rows 5, wherein the circuit carrier 2 has on the other planar side a column structure 6 as a second contact structure 6 with several individual electrically conductive columns 6, wherein at least one of the contact structures 5, 6 is formed on the circuit carrier 2, wherein the connecting material 3 has a first electrical resistance in the ground state without pressure application 9, wherein the connecting material 3 has a second electrical resistance in the connected state under pressure application 9.with an evaluation module, wherein the evaluation module determines a characteristic value of the electrical resistance of the connecting material 3 and, based on the characteristic value, determines the position of the pressure application 9 on the sensor device 1.

The invention discloses a directional crack induction assisted high-curvature snakelike double-lead structure micro-sensing device, and the device is characterized in that a conductive micro-ink layer and a conductive thin ink layer of a high-curvature snakelike double-lead structure micro-sensor have electromechanical characteristics of cooperatively realizing high-sensitivity resolution sensing, wide sensing range response and fatigue resistance; the characteristic is beneficial to preferential cracking of the conductive micro-ink layer during tensile strain, high-sensitivity resolution sensing is realized through directional micro-crack opening and closing deformation, and the conductive thin ink layer around the directional micro-crack opening and closing deformation is induced to form a snakelike conductive path; meanwhile, the conductive thin ink layer disperses stress through stretching and stretching, and the sensing ink layer of the high-curvature snakelike double-lead structure is integrally communicated, so that stable response in a wide sensing range is realized. The AQV212 relay integrated circuit has the characteristic of negative feedback regulation to intelligently control the operation of the sensing device, is connected with the high-curvature snakelike double-lead structure microsensor through a current collector wire, and can be used for biomedical monitoring and soft robots to adapt to driving sensing scenes of complex curved surfaces.

The invention belongs to the technical field of pressure sensors, and relates to a high-resistance pressure-sensitive carbon paste for a thin film type array pressure sensor, and a preparation method and application of the high-resistance pressure-sensitive carbon paste. According to the high-resistance pressure-sensitive carbon paste disclosed by the invention, in the cured carbon paste layer, the carbon powder and the epoxy resin cooperatively construct a stable three-dimensional network structure through the polyurethane elastomer. Wherein the polyurethane endows the material with excellent rebound resilience, so that the material can be quickly recovered after being pressed; the hollow glass beads are uniformly dispersed in the network, so that not only is the supporting capacity of the structure enhanced, but also the effects of stress dispersion and elastic supporting are achieved in the compression process, and rapid separation of carbon powder contact points after pressure relief is promoted; the epoxy resin provides excellent structural stability and adhesive force, prevents aging, cracking or performance degradation of the coating in long-term use, and ensures the durability of the sensor.

The application discloses a five-axis measuring machine probe force monitoring method and system, and relates to the technical field of probe force monitoring. The method collects multi-dimensional force signals of the probe through a mechanical sensor, decomposes an axial component, dynamically maps the probe attitude to a workpiece coordinate system, performs smooth processing on a force vector with an excessive change rate, matches a historical database to identify key feature points of complex geometric contact, converts to a local coordinate system of a contact point to obtain a force state, and adjusts a motion path if the components are unbalanced. The system is provided with multi-dimensional force collection and decomposition, attitude transformation, feature analysis, adjustment control and evaluation report modules, realizes the above functions, and improves measurement accuracy and equipment reliability through monitoring, adjustment and stability evaluation.

The invention relates to a force sensor, comprising: an active layer, wherein an electric variable of the force sensor depends on a force acting on the active layer such that by way of a change to the force acting on the active layer, a change to the electric variable is effected; wherein the force sensor comprises an attachment which is arranged relative to the active layer such that a force acting from the outside on the force sensor is conducted onto the active layer by means of the attachment. The invention also relates to a sensor group, an assembly, a set for positioning sensors on opposite regions of a head, a sensor holder for receiving at least one sensor, and uses and methods using the force sensor.

The invention discloses an on-line radiation monitoring and power-off protection MEMS pressure sensor and a preparation method thereof. The sensor can synchronously realize pressure measurement, radiation monitoring and power-off protection functions on a single chip. On the basis of realizing high-precision pressure measurement, the sensor is provided with a platinum film resistor in a specific area and is coated with an electromagnetic wave absorbing material to form a radiation sensing unit, so that the on-line monitoring on the electromagnetic radiation intensity of the environment is realized. The protection circuit closely integrated with the sensor continuously analyzes radiation dose signals, and once it is judged that the dose exceeds a preset safety threshold value, a control signal is generated, a power supply access of the pressure measurement unit is actively cut off, the pressure measurement unit is made to enter a dormant state, and therefore irreversible performance degradation or permanent damage is avoided. According to the invention, the conversion from passive bearing to active protection during the working of the sensor is realized, and the reliability of long-term working in an extreme electromagnetic environment is obviously improved.

The application discloses a pressure sensor based on friction nanogenerator, which can be deployed in a wearable device for monitoring pulse fluctuation, or deployed in an electronic device with a touch screen for detecting touch action. The sensor comprises two friction layers and at least one electrode layer. The two friction layers are respectively made of materials with different electron loss and gain abilities. The surface of at least one friction layer comprises a multi-stage micro-nano structure for inducing equal and opposite net charges corresponding to the applied pressure on the two friction layers under pressure. The multi-stage micro-nano structure comprises at least two kinds of micro-nano columnar structures with different heights. The electrode layer is used for generating current based on the net charges. The application can make the pressure sensor maintain high sensitivity to large static force through the designed multi-stage structure with different heights, and can expand the measurement range of the pressure sensor, so that the sensor maintains the same or similar sensitivity under various static forces.

Provided is a tactile sensor that allows restraining a decrease in spatial resolution and sensitivity of a sensor element and has waterproof and dust-proof properties. A tactile sensor AA includes a sensor element 1 and a casing 2 that houses the sensor element 1. The sensor element 1 includes: a base portion 10; a contact 20A having a contact end; a support body that supports the contact 20A in a displaceable manner with respect to the base portion; and a displacement detector that detects a displacement of the contact 20A with respect to the base portion 10. The casing 2 includes a film having flexibility that covers at least the contact end among the sensor element 1, and the contact end is secured to an inner surface of the film 60.

This application relates to pressure detection technology and discloses a flexible pressure acquisition system, device, and method based on a parallel architecture. It includes a signal acquisition and control module, a pressure sensor array, and an environmental monitoring module. The signal acquisition and control module includes an MCU and analog front-end circuitry. The analog front-end circuitry includes K parallel analog multiplexers. The MCU internally has K corresponding ADC channels. The pressure sensor array is electrically connected to the signal acquisition and control module, and its M×N pressure sensing units are divided into K parallel acquisition sub-regions. Each sub-region's column electrodes are connected to an analog multiplexer input channel. The environmental monitoring module acquires real-time environmental parameters. The MCU synchronously triggers all ADC channels to synchronously convert the pressure signals of the K sub-regions, and combines the environmental parameters with an adaptive filtering algorithm for compensation and correction, outputting pressure distribution data. This application can improve the sampling rate and measurement accuracy of the pressure acquisition system.

The invention belongs to the technical field of bearings, and discloses a foil dynamic pressure radial gas bearing bump foil creep test method, which is characterized in that a miniature rubber block is inserted between a top foil and a rigid substrate, and the miniature rubber block is used as a flexible element, is in direct contact with the top foil, and deforms under the action of a compression load transmitted by the top foil; a monocrystalline silicon semiconductor strain gauge is pasted on the side face of the miniature rubber block, and the direction is perpendicular to the direction of the compression load; in the running process of the bearing, the output strain value of the strain gauge is monitored in real time through a data acquisition system; the semiconductor strain gauge is a sensitive element manufactured based on the piezoresistive effect of semiconductor monocrystalline silicon, the resistivity of a semiconductor crystal material is changed when the semiconductor crystal material is stressed in a certain direction and deforms, and strain, stress and the like are indirectly measured. The device has the beneficial effect that the problem that the creep strain is difficult to test in real time due to the tiny structure of the bump foil is solved.