296 results about "Wheatstone bridge" patented technology

The invention discloses a microwave cold noise source fusing TEC temperature control and noise temperature compensation technologies, and belongs to the technical field of microwave radiometer calibration. The device comprises a cold source module, a noise compensation module and a constant-temperature control module, wherein the cold source module generates a low-temperature noise signal through a field-effect tube and a terminal resistor; the noise compensation module detects environment temperature change in real time based on a thermistor and a Wheatstone bridge, drives a noise diode to generate a compensation signal, couples the compensation signal with a cold source noise signal after attenuation, and counteracts noise temperature deviation caused by the environment temperature. The constant temperature control module adopts a platinum resistance sensor and a PID algorithm to control a Peltier element in a closed-loop mode, and accurate adjustment (+ / -0.1 DEG C) is achieved. According to the invention, noise compensation and TEC negative feedback temperature control technologies are combined, so that the noise temperature of the system is stabilized in a range of + / -0.1 K for a long time, the measurement precision and reliability of the microwave radiometer in an outdoor complex environment are remarkably improved, and the method is suitable for scenes of remote sensing detection, unmanned aerial vehicle monitoring and the like.

The invention discloses an integral type portable six-dimensional force measuring plate, which comprises an elastic body and a protection assembly arranged outside the elastic body, and further comprises a hub, a stress table and a plurality of strain beams, the stress table is arranged in the middle of the hub, the hub is connected with the stress table through the plurality of strain beams, a plurality of strain gauges are adhered to different positions of the strain beams, and the elastic body is connected with the hub through the strain gauges. A through hole is formed in the middle of the stress table, a bridge assembly plate for forming Wheatstone bridges and a data acquisition plate for acquiring and converting output signals of the elastomer are arranged in the through hole, and a plurality of wires are led out from the strain gauges and are welded to the bridge assembly plate to form six Wheatstone bridges which are respectively used for detecting forces and moments in three directions, namely Fx, Fy, Fz, Mx, My and Mz. The integrated force measuring plate has the advantages that the integral force measuring plate does not need to be spliced by a plurality of sensors, a plurality of beams can act together to balance stress and compensate each other, the influence of unbalance loading on a measuring result is reduced, and a plurality of force measuring plates can be spliced for use.

The invention provides an MEMS pressure sensor and a manufacturing method thereof, and an electronic device, and the method comprises the steps: providing a first substrate, forming at least two first pressure structures on the surface of the first substrate, each first pressure structure comprises a first electrode layer, a first sacrificial layer, a first supporting layer, a second electrode layer, a second supporting layer, and a first cavity, and a first release hole; a second substrate is provided, at least two second pressure structures are formed on the surface of the second substrate, and each second pressure structure comprises a third electrode layer, a second sacrificial layer and a second cavity; bonding the second supporting layer with the second sacrificial layer; the second substrate is removed to expose the third electrode layer, the third electrode layer and the second electrode layer form a variable capacitance structure, the second electrode layer and the first electrode layer form a reference capacitance structure, and the two variable capacitance structures and the two reference capacitance structures jointly form a Wheatstone bridge. According to the scheme, the measurement precision is improved, and the device performance is further improved.

The invention relates to an asymmetric multichannel thermal flow sensor for integrated component detection and a signal processing method, and belongs to the technical field of sensors. The problems that a traditional symmetrical single-channel thermal flow sensor is limited in measuring range, saturated in output, insufficient in measuring precision and single in measuring flow are solved. The sensor comprises a flow inlet cavity, a flow outlet cavity and a measuring pipeline composed of five parallel circular pipelines, the middle pipeline is a component measuring pipeline, and the four pipelines on the periphery are flow measuring pipelines. A probe is arranged in the middle of the component measuring pipeline, a heating resistance wire is arranged in the middle of the flow measuring pipeline, and temperature measuring resistance wires are asymmetrically distributed on two sides. The pipeline is made of aluminum, and fillets are arranged at the joints to optimize fluid flow. The heating resistance wire is a nickel chrome wire, the temperature measuring resistance wire is a platinum wire, the component measuring probe is made of a platinum film, and the surfaces of the platinum film and the platinum film are insulated. An improved Wheatstone bridge circuit is adopted for signal collection, and precision and protectiveness are improved.

The invention relates to the technical field of sensors, in particular to a rigid-flexible coupling rotating body deformation sensor based on full-flexible design and a testing method. The sensor comprises an annular main body; the annular main body is a closed ring formed by alternately connecting a plurality of rigid arcs and a plurality of flexible arcs; the rigid arc and the flexible arc are arranged in a manner of meeting dynamic balance; the plurality of micro data acquisition devices are respectively integrated on each rigid arc; the miniature data acquisition device comprises a Wheatstone bridge, a filtering module, a digital potentiometer, an analog-to-digital conversion module, a digital acquisition module, a single-chip microcomputer, a wireless signal sending module and a battery unit. The plurality of strain gauge groups are respectively arranged on the outer surface of each flexible arc; and the thickness of the flexible arc is uniform. According to the invention, deformation adaptation and high-sensitivity measurement are realized through a rigid-flexible arc alternating structure, and convenient monitoring under a rotation working condition is realized through a wireless communication miniature data acquisition device.

The invention discloses a piezoresistive pressure sensor chip and a preparation method thereof, and belongs to the technical field of micro-electromechanical systems. The piezoresistive pressure sensor chip comprises a substrate, the back of the substrate is etched with a cavity, the center of the cavity is provided with a cross-shaped mass block, and four hollow islands and four peninsula are arranged along the linear direction of the cross-shaped mass block; a plurality of groups of piezoresistor strips are arranged on the front surface of the substrate, each group of piezoresistor strips comprises a first piezoresistor strip component arranged close to the center and a second piezoresistor strip component arranged close to the side wall of the cavity, and the first piezoresistor strip component forms an internal Wheatstone bridge through a first metal lead group; the second piezoresistor strip component forms an external Wheatstone bridge through a second metal lead group; the glass is arranged on the substrate back. The piezoresistive pressure sensor chip can measure the pressure of a micro-pressure section, can bear high overload equivalent to a plurality of times of the full scale, and has the advantages of high sensitivity, good linearity, high precision, good dynamic performance and the like.

The invention provides an MEMS pressure sensor, a manufacturing method thereof and an electronic device, and the method comprises the steps: providing a first substrate and a second substrate, forming a first pressure structure on the first substrate, and forming a second pressure structure on the second substrate; bonding the first pressure structure and the second pressure structure; the first substrate is removed, the first pressure structure and the second pressure structure jointly form a third pressure structure, the third pressure structure comprises a first electrode layer, a second electrode layer, a third electrode layer, a fourth electrode layer and a fifth electrode layer which are arranged at intervals from top to bottom, and a dielectric layer is formed between every two adjacent electrode layers; and cavities penetrating through the dielectric layers are formed in the dielectric layers. According to the scheme, the multiple electrode layers arranged from bottom to top are formed, the multiple electrode layers form the first capacitor, the second capacitor, the third capacitor and the fourth capacitor respectively, then the Wheatstone bridge is formed jointly, the measurement precision of the MEMS pressure sensor is improved, meanwhile, the plane size of the MEMS pressure sensor is reduced, and the integration level of the device is improved.

The invention relates to the technical field of sensors, and provides a six-dimensional force and torque force sensor and a preparation method thereof.The six-dimensional force sensor is of a disc-shaped structure and comprises an outer supporting ring, an inner mass block and eight elastic beams connected between the outer supporting ring and the inner mass block; wherein the eight elastic beams comprise a first elastic beam and a second elastic beam which are alternately arranged around the inner mass block, the first elastic beam is a straight beam, the second elastic beam is a special-shaped beam, and a strain gauge preset on the main surface of each elastic beam responds to the strain of the elastic beam to generate a measurement signal; and the force and / or the torque applied to the inner mass block or the outer support ring can be determined according to the measurement signal. Due to the fact that the different elastic beams are different in shape and structure, the strain gauges are preset on the elastic beams of different types and positions, and the bridging mode is set, the output of each Wheatstone bridge is only sensitive to the force or the moment of force in the changed direction and is not sensitive to the force or the moment of force applied in other directions, and the decoupling capacity of the sensor structure is improved to the maximum degree.

The invention discloses a device and a method for measuring the velocity field of an autoclave through hot-pressing wind speed. The device comprises a thermosensitive probe, a Wheatstone bridge, a lock-in amplifier, an NI multi-channel data acquisition card and a computer, the thermosensitive probe is used for instantaneously detecting the temperature of a placement point position and generating resistance fluctuation based on sensing temperature change; the Wheatstone bridge is formed by connecting a fixed resistor, a variable resistor and a thermosensitive probe, and is used for forming a series circuit with the lock-in amplifier; the lock-in amplifier is used for supplying power to the Wheatstone bridge and providing co-frequency voltage at the same time, so that resistance data of a thermosensitive probe in the Wheatstone bridge is converted into voltage data to be output; the NI multi-channel data acquisition card is used for acquiring in-phase component voltage signals output by the lock-in amplifier; the computer is used for processing the voltage data to obtain the average speed and the pulsation speed of the measurement point. According to the invention, the problems of limited precision, insufficient sensitivity and poor adaptability to the internal environment of the autoclave in the conventional gas speed measurement method are solved.

The invention relates to an integrated multi-mode tactile perception dexterous finger and a robot, and belongs to the technical field of robot sensing. Comprising a flexible printed circuit which comprises a Wheatstone bridge circuit, a switch chip, a microcontroller, a rigid sensing unit and a flexible triboelectric sensing unit electrode; the rigid sensing unit comprises a temperature and pressure sensing chip; the Wheatstone bridge circuit is connected with the switch chip, and the switch chip is connected with the microcontroller; the microcontroller is respectively connected with the sensing chip and the flexible friction electric sensing unit electrode; the dexterous finger shell comprises a first shell and a second shell; the first shell and the second shell are connected to form a containing cavity, and the flexible printed circuit is arranged in the containing cavity. And the flexible friction electric sensing unit friction layers are arranged on the surfaces of the first shell and the second shell and are connected with the rigid sensing units and the flexible friction electric sensing unit electrodes. The multi-mode touch sensing device has a multi-mode sensing function, can recognize various touch modes, adopts an integrated mode, and enhances reliability and sensing precision.

The invention discloses a temperature self-compensation Wheatstone bridge structure, and relates to the field of Wheatstone bridges, at least one group of sub-strain gauges which are separated from adjacent arms, are mutually compatible and are attached to the same area of the same elastic beam exist in a four-arm resistor of the Wheatstone bridge structure; the temperature resistance change trends of the compatible sub strain gauges tend to be the same; wherein each group of compatible two sub-strain gauges are closely attached to each other so that the two sub-strain gauges are located in the same area of the same elastic beam, so that the two closely attached sub-strain gauges generate homodromous temperature resistance variation, resistance temperature drift caused by local temperature difference of different arms is counteracted, and temperature self-compensation is realized. According to the invention, temperature compensation can be carried out on the local temperature difference of the force sensor, so that the measurement accuracy of the six-dimensional force sensor is improved.

The invention discloses a micropositioner hysteresis compensation driving control system and method based on strain gauges, and relates to the technical field of micro positioning control. The system comprises a micropositioner mechanical module, a displacement detection feedback module, a control module and a power amplifier module. In the mechanical module, a piezoelectric ceramic stack drives a moving table, and a first flexible hinge group and a second flexible hinge group are respectively used for guiding and transmitting driving force and are symmetrically arranged; the displacement detection feedback module outputs a voltage signal through a strain gauge adhered to the first flexible hinge and a Wheatstone bridge; the control module reversely deduces actual displacement according to a voltage signal and a strain-displacement linear relation, and a control signal is generated by comparing an instruction; and the power amplifier module converts the signal into a driving voltage to adjust the piezoelectric ceramic stack, so that closed-loop control is realized to suppress a hysteresis error. According to the invention, system integration is realized, cost and operation difficulty are reduced, and positioning precision and reliability are improved.

The utility model discloses a high-precision joint torque sensor, which comprises a torque sensor flange and a PCB (printed circuit board) arranged on the torque sensor flange, and is characterized in that the torque sensor flange comprises an outer flange, an inner flange and at least one strain beam group connected with the outer flange and the inner flange; an annular hollow part is formed between the outer flange and the inner flange; each strain beam group comprises four strain beams which are arranged in the annular hollow part at equal intervals along the circumferential direction; a first strain gauge and a second strain gauge are arranged on the front face or the back face of each strain beam, and the first strain gauges and the second strain gauges on the four strain beams of each strain beam set are connected through a PCB to form a Wheatstone bridge structure. According to the utility model, the strain gauges are connected to form the Wheatstone bridge, and the torque measurement can be completed only through one AD sampling, so that the measurement is more convenient.

The invention relates to the technical field of force sensors, in particular to a strain gauge and a multi-dimensional force sensor using the strain gauge. Through the structural design of the strain gauge, the direct measurement of two times of multiplexing strain at the same position on the strain beam of the multi-dimensional force sensor is realized, and the precision and repeatability of the multi-dimensional force sensor are improved; the first measuring grid and the second measuring grid are nested, so that the influence of the temperature of a measuring point on the strain gauge is reduced, and the precision and the temperature performance of the sensor are improved; besides, the directions of the first zeroing gate and the second zeroing gate are consistent with the directions of the first measuring gate and the second measuring gate, so that the influence of the resistance change of the first zeroing gate and the second zeroing gate on the measurement of the strain gauge is reduced, and the linear precision is improved. Furthermore, the compensation of the initial zero point of the Wheatstone bridge can be realized, the compensation link of the multi-dimensional force sensor is simplified, the cost is reduced, the reliability of the multi-dimensional force sensor is improved, and the actual use requirement is met.

The invention provides a magnetic field sensor based on an amorphous wire giant magneto-impedance effect, which relates to the technical field of magnetic field testing and comprises a sensitive element module, an excitation module, a signal processing module and an anti-interference module. The sensitive element module adopts a CoFeSiB amorphous wire as a core sensitive material, an enameled wire is uniformly wound on the periphery of the amorphous wire to form an inductance coil, and the giant magneto-impedance effect of the amorphous wire is converted into a voltage signal through the inductance coil; and the excitation module is used for generating and outputting a high-frequency alternating excitation signal and loading the excitation signal to two ends of the inductance coil, so that the amorphous wire generates impedance change related to the to-be-measured magnetic field intensity under the action of high-frequency current. Through modular design and multi-technology cooperation of an amorphous wire giant magneto-impedance effect, Wheatstone bridge anti-interference, a temperature compensation algorithm, a multi-layer close winding and impedance matching technology, the performance bottlenecks of a traditional magnetic field sensor in the aspects of sensitivity, anti-interference, temperature drift control and signal transmission efficiency are broken through. And high-precision and high-reliability wide-temperature-range magnetic field detection is realized.

The invention relates to the technical field of rail transit transport vehicle detection, in particular to a method for measuring the axle temperature and the axle speed of a motor train unit, a circuit board fixing groove with an anti-reverse design is formed in a fixing shell and used for installing and fixing a circuit board assembly; two threaded mounting holes are formed in the mounting surface of the fixed shell and are used for fixing and connecting a sensor; the Rh is fixed on the side of the air guide hole through a pouring sealant, and the distances between the Rk and the Rh and the surface of the shell in the direction of the mounting gap are the same; the gear dependent measurement principle based on the Hall effect is abandoned, the temperature and resistance value change of the platinum thermistor Rh is driven through the installation gap airflow pressure intensity change caused by rotation of a measured shaft, shaft speed measurement is completed in combination with a Wheatstone bridge, and the installation position limitation and gear modulus constraint of a sensor on a metal gear are thoroughly eliminated. The installation flexibility of the sensor in the complex space layout under the motor train unit and the adaptation efficiency of different train types and shaft system structures are greatly improved.

The present invention discloses a high-sensitivity micro-mechanical system (MEMS) differential pressure sensor and a preparation method thereof, wherein the differential pressure sensor comprises a silicon nitride (SiN) with an etched window. x ) thin films, silicon (Si) substrates, SiN x Suspended structure self-supporting film, PdSe2 polycrystalline ultra-thin film, metal electrode and surface passivation layer. Ultra-thin PdSe2 has significant piezoresistive effect and ultra-thin suspended SiN x The device has a high pressure differential stress sensing characteristic, and the high Young's modulus SiN x The device ensures the reliability of differential pressure sensing. The Wheatstone bridge formed by the optimized metal electrode structure suppresses temperature drift, ensuring the accuracy of differential pressure measurement. Advantages of this invention include compatibility with silicon-based semiconductor processes, high yield, strong repeatability, good stability, and high device sensitivity.

The invention discloses a harmonic reducer integration-based strain torque sensor, and relates to the technical field of sensors, the harmonic reducer integration-based strain torque sensor comprises an annular strain gauge and a signal acquisition module, and the annular strain gauge is electrically connected with the signal acquisition module; the annular strain gauge is mounted on the bottom surface of the flexible gear and is concentric with the flexible gear; the signal acquisition module is mounted outside the hollow inner shaft of the flexible gear; during working, when output power of the flexible gear is subjected to resistance, the bottom surface of the flexible gear generates strain, the annular strain gauge converts a strain signal into an analog voltage signal through a Wheatstone bridge formed by a resistance wire grid, the analog voltage signal is output to the signal acquisition module, and a force value signal is obtained after digital-to-analog conversion; by arranging the annular strain gauge on the bottom surface of the flexible gear, real-time detection of output torque is realized, extra flexible introduction of deformation of the peripheral surface of the flexible gear is avoided, structural deformation is reduced, interference of rotation of a wave generator on signals is effectively suppressed through a Wheatstone bridge design, and measurement precision and stability are ensured.

A kind of heart sound sensing structure and its preparation method, the structure includes double SOI substrate, center mass, elastic support beam, piezoresistive sensing unit and capacitive sensing unit.The front surface of center mass is provided with additional mass layer, and the back surface is kept bottom layer silicon to increase thickness;Elastic support beam connects mass and frame;Piezoresistive sensing unit is composed of four piezoresistors to form wheatstone bridge, and capacitive sensing unit includes movable and fixed comb-tooth capacitive plate crossing each other.When the sound pressure gradient of heart sound signal drives mass to deviate, elastic support beam bends to change piezoresistive value, and at the same time, comb-tooth capacitive plate overlapping area changes to cause capacitive value change, to realize piezoresistive and capacitive dual-mode synchronous detection.Two kinds of detection mechanisms calibrate each other, which significantly improves the sensitivity and anti-interference ability of low-frequency heart sound signal.The preparation method is based on double SOI substrate, integrated by ion implantation, etching, metal deposition and 3D printing process, suitable for miniaturized wearable heart sound monitoring application.

By utilizing the existing speaker drivers associated with the dam headphones, smart headphone functionality is enabled without the need for additional auxiliary sensors, providing a peripheral device that excels in terms of weight, volume, cost, and power consumption. [Solution] The zeroing circuit 300, which selectively couples to the magnetic coil driver of the headset, includes a Wheatstone bridge that detects minute fluctuations in the headphone driver voltage caused by the excitation signal, thereby zeroing out the electrical energy associated with the audio input signal. This provides an output signal that mainly consists of the electrical energy associated with the excitation signal generated by the magnetic coil driver in response to external pressure applied to the diaphragm.

A production method for a flip-chip pressure sensor for back pressure, the flip-chip pressure sensor for back pressure comprising a main chip portion (1) and a cover plate portion (2), wherein a Wheatstone bridge (12) and a first electrical connection structure (13) are provided on a main body (11) of the main chip portion (1), the first electrical connection structure (13) being electrically connected to the Wheatstone bridge (12); and the cover plate portion (2) comprises a cover plate (21) and a second electrical connection structure (22), the cover plate (21) being bonded to the main body (11), and realizing electrical connection between the second electrical connection structure (22) and the first electrical connection structure (13). The second electrical connection structure (22) passes through the cover plate (21) and extends to the side surface of the cover plate (21) facing away from the main body (11), enabling direct soldering packaging of the second electrical connection structure (22) and an external substrate by means of SMT, and thereby facilitating packaging, improving the packaging efficiency and reliability of the flip-chip pressure sensor for back pressure.

The invention discloses a flexible resistive sensor based on gallium-based liquid metal and application thereof, the flexible resistive sensor comprises an upper PDMS substrate and a lower PDMS substrate, and the upper PDMS substrate and the lower PDMS substrate are provided with micro-channels; the micro-channel is filled with gallium-based liquid metal, and the gallium-based liquid metal is gallium-indium-tin alloy; when the sensor is used as a touch sensor, the sensor is provided with four fingerprint-shaped micro-channels which are symmetrically distributed on long and short axes of an ellipse, and the design of a Wheatstone bridge circuit is combined, so that pressure and temperature signals can be effectively decoupled, and high-precision pressure detection and independent temperature sensing are realized; when being used as a strain sensor, the strain sensor is provided with a snakelike micro-channel. The sensor has excellent flexibility, ductility and wear resistance, high-precision detection of pressure and temperature can be achieved, the bending angle of the finger joint can be monitored synchronously, the working performance is stable, and the dynamic range is wide; the method has obvious effects in object texture identification and finger motion state detection, and has important application value in flexible robots, intelligent prostheses and wearable intelligent devices.

The application provides a kind of hollow core polarization maintaining optical fiber cutting machine tension control system and control method, belong to optical fiber cutting control technical field, system uses four layers architecture of perception layer, processing layer, control layer, execution layer: perception layer is measured by double strain gauge symmetrical compensation device and temperature sensor synchronous acquisition mechanics and environmental signal;Processing layer adopts Wheatstone bridge, instrument amplifier, low-pass filter, 16-bit ADC and temperature compensation unit to realize signal multistage conditioning;Control layer deploys feedforward adaptive PID compound control system, combined with optical fiber diameter-tension parameter library feedforward compensation and dynamic PID adjustment, and integrates step loading control and fault early warning mechanism;Execution layer adopts torque mode motor and outputs linear tension through lead screw mechanism.

Magnetic field sensor (100), comprising: a first bridge circuit (121) comprising a first magnetoresistive sensor, a second magnetoresistive sensor, a third magnetoresistive sensor, and a fourth magnetoresistive sensor connected as a Wheatstone bridge to detect a magnetic field along a first direction orthogonal to a plane of the first, second, third, and fourth magnetoresistive sensors; wherein The first magnetoresistive sensor includes: a first detection element (122); and a first flux guide (132; 136) comprising a first high permeability magnetic material, the first flux guide (132; 136) being disposed (i) adjacent to and (ii) above or below the first sensing element (122); the second magnetoresistive sensor includes: a second detection element (123); and a second flux guide (133; 137) comprising a second high permeability magnetic material, the second flux guide (133; 137) being disposed (i) adjacent to and (ii) above or below the second sensing element (123); the third magnetoresistive sensor includes: a third sensing element (124); and a third flux guide (134; 138) comprising a third high-permeability magnetic material, the third flux guide (138; 143) being disposed (i) adjacent to and (ii) above or below the third sensing element (124); and the fourth magnetoresistive sensor includes: a fourth detection element (125); and a fourth flux guide (135; 139) comprising a fourth high permeability magnetic material, the fourth flux guide (135; 139) being disposed (i) adjacent to and (ii) above or below the fourth sensing element (125); wherein the first (132; 136), the second (133; 137), the third (134; 138) and the fourth (135; 139) flux guides are arranged asymmetrically, so that two of the first flux guide (132; 136), the second flux guide (133; 137), the third flux guide (134; 138) and the fourth flux guide (135; 139) are arranged directly above a first edge of the respective detection element (121; 122; 123; 124) and two others of the first flux guide (132; 136), the second flux guide (133; 137), the third flux guide (134; 138) and the fourth flux guide (135; 139) are arranged directly below a second edge of the respective detection element (121; 122; 123; 124), wherein the first and second edges are arranged on opposite sides of the respective detection elements (121; 122; 123; 124).

The application discloses a MEMS sensor and an electronic atomization device. The MEMS sensor comprises a substrate, a passivation layer, a substrate, a first force applying element, a second force applying element and a conductive contact. The first surface of the substrate has a groove, and the second surface has a Wheatstone bridge circuit. The passivation layer covers the second surface of the substrate. The substrate covers the groove to form a sealed cavity with the substrate. At least part of the first force applying element is arranged on the side of the passivation layer away from the substrate. At least part of the second force applying element is arranged on the bottom wall of the groove. The conductive contact is arranged on the substrate and / or the substrate. The first force applying element and the second force applying element are both configured to apply a force close to or away from the substrate to the bottom wall of the groove under the condition of being powered on. In this way, the substrate can always be in a flat initial state, thereby improving the problem that the deformation of the substrate does not change linearly with the pressure, and improving the detection accuracy of the MEMS sensor.

The present application belongs to the technical field of calibration of aerospace force test devices, and particularly relates to a method for determining wind tunnel strain balance measurement uncertainty in intervals, comprising: determining a plurality of calibration load intervals for static calibration of the balance; determining a load load implementation table and a comprehensive load error verification load implementation table for static calibration of the balance, and simultaneously loading six components on the balance to be calibrated to obtain actual output signal values of each component of the Wheatstone bridge of the balance to be calibrated and verification output signal values of each component of the Wheatstone bridge of the balance; using a response surface method, obtaining a working formula of the balance to be calibrated corresponding to the calibration load interval according to different calibration load intervals and actual output signal values of each component of the Wheatstone bridge of the balance; verifying the working formula of each balance according to the verification output signal values of each component of the Wheatstone bridge corresponding to the calibration load interval, and obtaining wind tunnel strain balance measurement uncertainty of the balance in different calibration load intervals.

The invention discloses an on-site zero setting method and device for a force sensor, and belongs to the technical field of industrial control. The invention provides a force sensor field zeroing method, aiming at solving the technical problems that the operation is time-consuming, the process is complicated and the zeroing precision is low because the existing force sensor field zeroing depends on a hardware manual knob resistor. Firstly, an ADC module collects an initial output voltage value of a force sensor Wheatstone bridge and transmits the initial output voltage value to a control module; the control module calculates a difference value delta V with a target zero value and judges a preset interval to which the delta V belongs; the corresponding DAC adjustment step length is matched according to the interval; controlling the DAC module to output an adjusting voltage to a bridge compensation end; the steps of sampling, judging and adjusting are executed circularly until delta V is smaller than or equal to 0.0001 V, and zero setting is completed; and finally, the final adjustment voltage of the DAC is stored in the storage module. Software control replaces traditional hardware manual operation, equipment disassembly and assembly are not needed, zero setting time consumption is shortened, operation complexity is reduced, zero setting precision is improved through adaptive step length and closed-loop control, and the method is suitable for field calibration of force sensors in scenes of electronic weighing instruments, industrial control, material testing machines and the like.

The application discloses a high-precision self-calibration magnetic switch chip, which is used for improving the precision of chip magnetic field detection work. The application comprises the following steps: VCC pins are connected with a band gap reference and current bias module and a debugging calibration module respectively; the band gap reference and current bias module are connected with a power supply voltage module and a reference voltage module respectively; a digital module is connected with the debugging calibration module and the reference voltage module VREF_COMP respectively; a Wheatstone bridge is connected with the power supply voltage module, a GND pin and a low-offset comparator; the low-offset comparator is connected with the reference voltage module, the digital module and a first transistor NMOS; the first transistor NMOS is connected with the GND pin and an OUT pin; a multiplexing output module is connected with the digital module, the debugging calibration module and the OUT pin; the debugging calibration module is connected with the OUT pin and a Test pin.

The invention provides a vanadium dioxide temperature compensation gas flow sensor, and belongs to the field of sensor manufacturing. The sensor comprises a silicon substrate, a silicon oxide and silicon nitride layer, a heat insulation cavity, a heat insulation gap, a chromium adhesion layer, a vanadium dioxide temperature measurement resistor, a platinum heating resistor, a platinum environment temperature measurement resistor, a platinum wire and a platinum electrode, wherein a heating resistor is arranged in the center of the silicon oxide and silicon nitride layer suspended above the cavity, four vanadium dioxide temperature measurement resistors are symmetrically distributed on two sides of the heating resistor to form a Wheatstone bridge, a heat insulation gap is formed between the heating resistor and the temperature measurement resistors, and platinum environment temperature measurement resistors are distributed on the upstream and the downstream of the cavity area. When no gas flows in, chip heat distribution is symmetrical, and upstream and downstream vanadium dioxide temperature measuring resistors have the same resistance value; when gas flows in, the resistance value of upstream vanadium dioxide is increased, the resistance value of downstream vanadium dioxide is decreased, the Wheatstone bridge outputs voltage, the relation between the voltage value and the gas flow is recorded, and then the flow is compensated and corrected according to the values of the environment temperature measuring resistor and the heating resistor to obtain the final gas flow value.

This invention belongs to the field of stress-strain testing technology, specifically relating to a welded strain gauge for nuclear power plant testing. Both the strain gauge and the terminals are mounted on a metal base. The strain gauge consists of a main strain gauge and a compensating strain gauge. The strain gauge and the terminals are connected by wires. Measuring wires are also connected to the terminals. Measuring wire one has a male connector, and measuring wire two has a female connector. Measuring wire one and measuring wire two are connected via the male and female connectors. Measuring wire two is connected to a compensating bridge box. The compensating bridge box contains two precision resistors, forming a Wheatstone bridge with the main strain gauge and the compensating strain gauge on the metal base. This invention is used for stress-strain measurement on the surface of pressure vessels such as nuclear power pressure pipelines.