86results about How to "Inhibit temperature drift" patented technology

The invention provides a method for automatically correcting temperature drift of an electrical vortex sensor. According to the method, a certain impedance measuring circuit is utilized to obtain the equivalent inductance and the resistance of a detection coil, the relationship, changing along with temperature and measurement, of the inductance and the resistance of the detection coil is utilized to remove the influence of temperature changes and extract actual measured change information. According to the method, signals of the vortex sensor composed of an impedance measuring module (4) and a rectification calculating module (5) is used for conditioning the circuit, so that to-be-measured information is obtained, rectification is conducted automatically, and the influence of temperature changes is removed at the same time. According to the method, when temperature drift is rectified, no extra probes or coils or temperature sensors are further arranged, and temperature drift rectification effect is remarkable. Moreover, the method has the advantages of being wide in application range, simple in structure, easy to implement and the like. When the method is used for automatically rectifying the temperature drift of a probe of the electrical vortex sensor, temperature drift coefficients can generally be reduced to below 5nm / DEG C from 500nm / DEG C.

The invention discloses electric insulation electric-heating aging test equipment, which comprises non-vignetting high-voltage testing transformer and at least one test box, wherein the box body of the test box is adiabatic; the inside of the test box is provided with a heating device; the top of the test box is provided with at least one high-voltage electrode connected with the high-voltage output end of the non-vignetting high-voltage testing transformer, while the lower part is provided with at least one detection terminal; and the high-voltage electrode and the detection terminal are respectively insulated from the box body of the test box. The electric insulation electric-heating aging test equipment can effectively simulate the electrical and thermal stress on electric equipment during operation, and carries out experiment on a plurality of test samples under different temperatures, voltage types and voltage grades; moreover, the test equipment obtains the data of current waveform and local discharging signal during the aging process of test samples.

A sensor system includes a sensor device (10) and an integrated circuit (20) for driving the device (10). The device (10) includes a sensor body (1) of a silicon-based material, an upper sealing member (2) of a silicon-based material and a lower sealing member (3) of a silicon-based material. The upper sealing member (2) and the lower sealing member (3) are joined together to cooperatively house the body (1) therewithin in an airtight manner. The device (10) and the circuit (20) are formed as a stacked body. The body (1) is electrically connected to a wiring pattern (12) of the circuit (20) through a conductive through-path (4) penetrating the upper sealing member (4) and a mounting electrode (5) provided on an outer surface of the upper sealing member (2). The device (10) is connected to an MID substrate (30) through the circuit (20).

A thermal infrared solid-state imaging device includes a horizontal scanning circuit for scanning a pixel area horizontally to read an infrared image, and vertical scanning circuits provided at both ends of the pixel area. The vertical scanning circuits drive a drive line by applying a driving voltage at both ends of the drive line (in two-end driving). Further a bias voltage is applied at the end of the pixel area to a bias line connected to differential integrating circuits.

The invention discloses an electrical insulation electric heating aging test device under composite voltage, which comprises two corona-free high-voltage test transformers and at least one test box, wherein a box body of the test box insulates heat; the test box is internally provided with a heating device; at least one high-voltage electrode which is connected with high-voltage output ends of the corona-free high-voltage test transformers is introduced to the top of the test box; the lower part of the test box is provided with at least one detection terminal; and the high-voltage electrodes and the detection terminals are respectively insulated with the box body of the test box. The electrical insulation electric heating aging test device under composite voltage provided by the invention can effectively simulate the composite electricity and heat stress borne by an electrical device in operation, also can test sample products under different temperatures, voltage types and voltage grades at the same time, and can obtain the breakdown voltage and breakdown time of the sample products in the aging process.

The invention provides an MEMS wafer level vacuum package structure and a manufacturing method thereof. The package structure comprises a silicon cover plate and an MEMS wafer with a movable structure, wherein a vertical through hole is formed on the cover plate, the through hole is internally filled with a conductive material, a bonding surface of the cover plate is provided with a groove, a layer of getter film is arranged at the bottom of the groove, and the silicon cover plate and the MEMS wafer with the movable structure form the vacuum package structure by wafer bonding. The manufacturing method provided by the invention comprises the following steps: at first, manufacturing the through hole on the cover plate, and filling the conductive material in the hole; and then, forming the groove on the bonding surface, depositing a layer of getter film on the bottom of the groove, depositing a layer of multilayer metal film in a bonding area, and wafer bonding the cover plate with the MEMS wafer with the movable structure in a vacuum environment. According to the MEMS wafer level vacuum package structure provided by the invention, the groove with the getter and the through hole are formed on the silicon cover plate to export an electrode from the closed groove without carrying out wire bonding, so that the procedures are simple, meanwhile, the vacuum maintenance ability in the package structure is improved, contamination of granules to the movable structure during cutting is avoided, and performance of the device is guaranteed.

Embodiments of the present disclosure provide a force detection apparatus and method, a touch device and an electronic terminal. The apparatus includes: a first detection capacitor, and a second detection capacitor configured to perform differential processing for a capacitance of the first detection capacitor to cancel an interference signal; wherein the first detection capacitor includes a forcedetection electrode, and the second detection capacitor includes a reference detection electrode, the force detection electrode and the reference detection electrode being arranged within a surface,such that the first detection capacitor and the second detection capacitor are simultaneously coupled to the interference signal causing interference to force detection, and differential processing isperformed for capacitances of the first detection capacitor and the second detection capacitor. In this way, the interference signal, for example, which caused by a display device, is canceled, and sensitivity of force detection is enhanced while temperature drift is inhibited.

The invention relates to a TEC-based laser temperature control circuit. Conventional temperature control systems on the market are mainly in the forms of switch control and large-size industrial temperature control modules. A power supply circuit provides a +5V power input for a temperature control chip circuit. The temperature control chip circuit controls the direction and the size of peripheral TEC currents and receives feedback signals of a Wheatstone bridge circuit. An NTC provides feedback resistance of temperature change for the Wheatstone bridge circuit. According to the TEC-based laser temperature control circuit, the high-precision NTC is taken as a temperature sensor for measuring temperature signals, and a TEC is utilized as an execution unit for refrigerating / heating a laser. A Wheatstone bridge method is employed for measuring a voltage difference so that temperature drifting is inhibited. An MAX1978 chip provides difference amplification and TEC current driving for voltage difference signals.

The invention discloses a biaxially resonant silicon-micromachined accelerometer in the shape of a Chinese character 'tian' and aims at designing and manufacturing a high-sensitivity and high-resolution biaxially-resonant silicon-micromachined accelerometer. The structure is characterized in that (1) because a mass block structure in the shape of a Chinese character 'tian' is adopted, the volume of a mass block is maximized, and the acceleration can be converted into an inertial force more effectively; and the whole structure is symmetrically distributed, which is favorable for resisting noises and inhibiting temperature drift; (2) a support beam (in the shape of a Chinese character 'ji') arranged at the periphery of the structure facilitates the release of the residual stress and temperature stress of the structure, thereby reducing the support stiffness of the structure in a sensitive direction; (3) due to the application of a spring-like beam (in the shape of a Chinese character 'kou') at one end of a resonator, the influence of external shocks on the beam is reduced, and the spring-like beam plays a role in releasing the residual stress of the structure; and (4) an arc structure at the root part of a tuning fork in the resonator can be used for effectively reducing the energy coupling and improving the mechanical quality factor of the resonator, and is easy for realizationof closed-loop control.

The invention relates to check equipment, in particular to a software compensation type all-temperature SF 6 gas density relay check device capable of checking an SF6 gas density relay at an extremely low or high temperature. The check device comprises a housing and a high-low temperature-controlled cabinet outside the housing, and is characterized in that a density relay and a temperature sensor are arranged in the high-low temperature-controlled cabinet; an SF6 gas storage tank is fixed at the inner lower part of the housing; the top of the gas storage tank is connected with a four-way joint, and the other three ends of the four-way joint are respectively connected with a pressure sensor, a pressure regulation device and a controller capable of controlling an industry control computer; and all the pieces are connected through a gas connection pipe. In addition, the industry control computer is provided with a density relay actuating signal input port connected with a connecting wire. The check device provided by the invention has the advantages of unique structure, convenience in operation and use, high all-temperature precision, and reliability in check.

The invention discloses a current sensing device based on magnetic field sensing, relating to the super magnetostriction material sensing technology and current vortex displacement sensing technology. The current sensing device based on magnetic field sensing aims to solve problems that the present current sensor adopts optical members and needs to be equipped with a photoelectric device, which affects the output result and cannot perform protection in time once a fault happens. A magnetic sensing unit comprises a GMM rod and an output rod; the GMM rod is used for sensing a magnetic field of a transmission line to generate axial telescoping so as to transmit strain to the output rod; a displacement sensor comprises a probe coil, an excitation signal source, an AC bridge, a signal modulation circuit and a low-pass filtering circuit; the excitation signal is used for producing a sine excitation signal which is loaded to two ends of a probe coil through an AC bridge; the probe coil is used for sensing the axial telescoping generated by the GMM rod, and a generated sensing signal is outputted after successively going through a signal modulation circuit and a low-pass filtering circuit The current sensing device based on magnetic field sensing is used for measuring bus current of an extra high voltage transmission system.

It relates to a photoelectric analog equipment.It comprises the power, integrating sphere, light source, baffle screen, light window and feedback device. The power ignites the light source that locates at the spherical center of the integrating sphere or the ball wall, the light window being a hole open at the integrating sphere wall, the baffle screen inside the integrating sphere, and the light source and the light window at both sides of the baffle screen and the light window connected with the feedback device and the electric power. It makes full use of integrating sphere to output even light to realize the fine analog of solar output.

The invention provides a piezoresistive sensor, a pressure detecting device and an electronic device and belongs to the field of electronic technology equipment. The piezoresistive sensor comprises asubstrate (12) and a half bridge piezoresistive sensing unit; the half bridge piezoresistive sensing unit comprises two bridge arms (6, 7), two bridge arms (6, 7) are connected in series; The connecting ends of the bridge arms (6, 7) lead to the signal collecting end (IN); the open ends of the two bridge arms (6, 7) respectively lead to the excitation signal applying end; each of the bridge arms (6, 7) includes at least one a resistor unit (101, 102, 103, 104), a resistor unit (101, 102, 103, 104) on the substrate (12), and two bridge arms (6, 7) including a resistor unit (101, 102, 103, The number of 104) is the same. This allows the piezoresistive sensor to suppress temperature drift and increase the amount of signal when the pressure detection function is implemented, and the internal space requirements of the entire electronic device are relatively low, and it is easy to promote.

The invention relates to a cross transpose fully low pressure low temperature drift cold scanning probe microscope body which comprises a probe, a sample, and two piezoelectric tubes that stand in parallel and are fixed on a base, wherein the probe and the sample are respectively arranged at free ends of the two piezoelectric tubes, the regulation direction of the space between the probe and the sample is vertical to the axis direction of the two piezoelectric tubes, and the two piezoelectric tubes at least comprise an X location, a Y location and a Z location which are integrally or detachably arranged. The invention improves the regulation range of the space between the probe and the sample through setting the regulation direction of the space between the probe and the sample to be vertical to the axial direction of the two piezoelectric tubes so as to realize that the function of crude approximation, fine approximation and imaging on a wavy surface by using high voltage more than 18V in the prior art can be realized under the condition of fully using low voltage less than 18V, and has higher heat stability.

A liquid cooling system for an internal combustion engine includes a coolant pump, an air-to-liquid heat exchanger, and a bypass loop for allowing coolant to circulate from the coolant pump to the engine without passing through the heat exchanger. A thermostatic valve mounted within a thermostat housing and including a temperature-responsive primary valve element and bypass flow control will control the flow of coolant with a spring-loaded valve disc having a conical, annular sealing surface configured for linear contact with the valve seat.

The present invention claims to protect a three-axis accelerometer calibration method based on a cross in an inertial navigation system. This method is realized by making a cross mark on a horizontal platform. The horizontal platform is any platform parallel to the ground plane. The cross is any two signs perpendicular to each other; the original value of the accelerometer is the processing object, and the original value is not divided by the value of the scale factor; the original value of the accelerometer at the six positions is filtered, and the six The position is six positions with the cross as a reference; and the filtered original value is temperature compensated by the least square method; then the average value of the temperature compensated original value is taken as the original value corresponding to the six positions; finally through the acceleration The calibration coefficient of the error calibration model can be obtained by using the formula for obtaining the calibration coefficient of the meter. The method can overcome the problems of calibration error caused by unfixed scale factor, complex calibration process, temperature drift and long calibration period.

The invention relates to the technical field of switching power supply, in particular to a method for inhibiting temperature drift of a switching power supply. The method is applied to a device comprising a PWM module, an ADC module, a comparator and a digital PID regulator module. The method comprises the following steps: establishing a neural network parameter model by the digital PID regulator module; establishing a parameter model by using a neural network according to a temperature drift rule in a wide temperature environment; training to obtain a temperature drift compensation data look-up table of PWM driving duty ratio (Delta)d, so as to more quickly compensate the temperature drift of the power supply based on the look-up table; calculating and obtaining a changed duty ratio; obtaining a changed output DC voltage value based on a comparison result of the comparator. The method adopts a simple and effective single-cycle modulation mode modulation strategy.

The invention discloses a local discharging sensor combining a graphene diaphragm with a micro optical fiber interference cavity and a detection method based thereon. The local discharging sensor comprises a tunable laser device (1), a laser device wavelength control module (2), an optical fiber circulator (3), monomode optical fiber (4), the micro optical fiber interference cavity (5), a photoelectric detector (6), a signal line (7), a filter (8) and a data collection card (9). A multilayer graphene membrane is adopted, so that detection sensitivity of the sensor is improved; on the basis ofstructure optimization design of the multilayer graphene membrane, the multilayer graphene membrane is enabled to adapt to local discharging detection frequency band requirements; a polyimide coatingis adopted to prolong service life of the multilayer graphene membrane; femtosecond laser is adopted to process the micro optical fiber interference cavity inside optical fiber, and a static-state working point is stabilized on the basis of laser device wavelength control. On the basis of optimization design of a detection device mounting mode, original working environment of electrical equipmentis unaffected during mounting of the local discharging sensor.

There is provided a time-of-flight mass spectrometer of a simple configuration and low cost that prevents temperature drift and provides stable mass spectrum without the use of expensive Invar material for the flight tube which nevertheless is not easily affected by external vibrations and does not deflect under its own weight when held as a cantilever. The flight-tube is made of a CFRP pipe 17a whose inner and outer surfaces are provided with an electroless nickel-plated layer 17b as an electroconductive treatment. Electroconductive adhesive 21 is used for joining to flight-tube holding member 18. Unlike previous flight-tubes made of metal, flight-tubes made of CFRP pipe 17a do not deform even when no temperature adjustment and control system is used. Also, since the specific gravity of CFRP is only about one-fifth of that of stainless steel, the flight-tube does not easily deflect even when it is held as a cantilever. Furthermore, since CFRP has good vibration damping property, it is not easily affected by vibrations.

According to a packaging method and a packaging structure of a bulk acoustic wave resonator provided by the invention, a resonator cover body is manufactured by forming an elastic bonding material layer with a second cavity on a second substrate, then the resonator cover body can be directly bonded with a resonant cavity main body structure through the elastic bonding material layer on the resonator cover body, the elastic bonding material layer loses elasticity, after that, a through hole and a conductive interconnection layer covering the inner surface of the through hole can be formed on the resonator cover body. The process has the characteristics of low cost, simple process and high compatibility with a resonant cavity main body structure process, does not cause the pollution problemof a gold-gold bonding process, and can reduce the influence on a first cavity to the maximum extent; and the elasticity of the elastic bonding material layer can be utilized to tolerate a certain step height difference of the bulk acoustic wave resonance structure in the peripheral area of the first cavity in the bonding process, so that the bonding reliability and stability can be ensured.

The invention relates to a thermal-conducting gas sensor and a gas detecting device, and in particular to a self-regulating thermal-conducting gas sensor and a gas detecting device. The device comprises a shell, a signal processing module, a measuring sensor, an air intake pipeline and an air outlet pipeline, wherein the air intake pipeline is connected with the air outlet pipeline through the measuring sensor; the measuring sensor comprises a thermistor, specifically a two-stage operational amplifier circuit with a positive feedback system stability gain of 1; and the thermistor is connectedbetween two operational amplifiers, so that when the operational amplifiers are balanced, the resistance value of a temperature sensing module is a set value, and then when the measured gas causes thetemperature of a temperature sensor to change, the operational amplifier circuit automatically adjusts the resistance of the thermistor to a set value so as to avoid the temperature drift errors caused by the uncertainty of the working resistance. The device is simple in structure and low in cost and is capable of realizing a self-adjusting function for the working temperature and resistance value of the thermistor.

The invention provides a temperature compensation type surface acoustic wave device and a manufacturing method thereof. The manufacturing method comprises the following steps: providing a piezoelectric material substrate; coating a first photoresist on the piezoelectric material substrate, exposing and developing the first photoresist, and defining an IDT metal layer semi-buried gully pattern; etching the piezoelectric material substrate to form an IDT metal filling trench corresponding to the IDT metal layer semi-buried trench pattern, and removing the first photoresist; depositing metal on the etched piezoelectric material substrate to form an IDT metal layer, and enabling the IDT metal layer to fill the IDT metal filling trench and overflow the IDT metal filling trench; coating a secondphotoresist on the IDT metal layer, exposing and developing the second photoresist, and defining an IDT pattern; etching the IDT metal layer to form an IDT metal finger strip structure correspondingto the IDT pattern, and removing the second photoresist; and depositing a dielectric material on the piezoelectric material substrate and the IDT metal finger strip structure to form a dielectric layer.

The invention discloses a measuring system and a measuring method for particle flow parameters. The measuring system comprises a sensor device, a detection circuit and a signal acquisition and processing module, wherein the detection circuit is used for extracting a detection signal output by means of the sensor device, the signal acquisition and processing module obtains the particle flow parameters according to the signal extracted by means of the detection circuit, and the sensor device comprises a detection casing pipe, two response electrodes and an excitation electrode; the detection casing pipe has an internal detection channel; the two response electrodes and the excitation electrode are axially arranged on the inner surface of the detection casing pipe along the detection sleeve at intervals, and are in direction contact with the detection channel; and an isolation unit used for electric isolation is arranged at an interval position between the response electrodes and the excitation electrode, and the isolating unit is arranged at the interval position of the response electrodes and the excitation electrode. The measuring system and the measuring method can prevent temperature drift and can improve the precision and reliability of speed measurement.

The invention relates to the technical field of crystal oscillator frequency regulating devices, in particular to a high-stability constant-temperature digital voltage-controlled crystal oscillator system. The high-stability constant-temperature digital voltage-controlled crystal oscillator system comprises a digital-to-analog converter, a first voltage stabilizer, a constant-temperature crystal oscillator and a thermostatic bath, wherein the digital-to-analog converter, the first voltage stabilizer and the constant-temperature crystal oscillator are limited by the respective temperature characteristic in a working process, so that the output frequency of the constant-temperature crystal oscillator generates drifting. The digital-to-analog converter, the first voltage stabilizer and the constant-temperature crystal oscillator in the system are positioned in the thermostatic bath, so that the temperature drifting can be effectively suppressed, and thus the output frequency of the constant-temperature crystal oscillator is stable, and the precision of the output frequency of a clock system is improved.

The invention provides a capacitive electromagnetic flowmeter which suppresses the thermal influence from an excitation coil or a fluid and the influence of magnetic flux differential noise caused by a magnetic circuit without protecting an electrode and shielding a cable. A pre-amplifier substrate (5) on which a pre-amplifier (5U) for amplifying the electromotive force detected by surface electrodes (10A, 10B) is mounted is disposed in a direction intersecting a measurement tube (2) and at a position outside a magnetic flux region (F) in which magnetic flux (fai) is generated.