79 results about "Temperature coefficient" patented technology

The invention relates to a temperature drift compensation method for a pressure instrument, and belongs to the technical field of pressure instruments, and the method comprises the following steps: obtaining output signal values of a pressure sensor at different temperature points, and building a temperature-output signal data set; constructing a polynomial fitting model as a temperature drift compensation model, fitting a temperature coefficient through a least square method, and storing the coefficient into an instrument memory; original values of temperature and pressure are collected in real time and substituted into the model to calculate a compensated pressure value. The method also supports various strategies such as temperature sensor calibration, nonlinear error compensation, Kalman filtering noise reduction, dynamic temperature change rate compensation and neural network compensation, and has self-calibration and remote updating functions. According to the invention, the measurement precision and stability of the pressure instrument in a variable-temperature environment are significantly improved, and the method is suitable for high-precision industrial measurement and intelligent monitoring scenes of the Internet of Things.

Multiple degenerately-doped silicon layers are implemented within resonant structures to control multiple orders of temperature coefficients of frequency.

The invention provides a temperature sensor and a temperature detection method. The temperature sensor comprises a temperature sensing module, a current frequency conversion module and a counting module. The temperature sensing module comprises a first P-type MOSFET, a second P-type MOSFET and a bias unit, the source end of the first P-type MOSFET is connected to power supply voltage, and the gate end and the drain end of the first P-type MOSFET are in short circuit; the source end of the second P-type MOSFET is connected to the power supply voltage, and the gate end and the drain end of the second P-type MOSFET are in short circuit; the bias unit is used for providing bias current, so that the first P-type MOSFET and the second P-type MOSFET respectively generate first temperature sensing current and second temperature sensing current which are related to temperature and have different temperature coefficients under the action of the bias current; the current frequency conversion module is used for converting the first temperature-sensing current and the second temperature-sensing current into a first clock signal and a second clock signal after mirror image duplication is carried out on the first temperature-sensing current and the second temperature-sensing current respectively; the counting module is used for counting the first clock signal and the second clock signal and reading temperature data.

The invention discloses a telescope main reflection surface shape real-time evaluation and on-demand adjustment integration method. An adjustment reference attitude and a reference temperature field are used as error zero points, and the whole process is calculated based on relative quantity. A gravity deformation database, a three-dimensional Chebyshev (or Legendre) temperature basis function unit response deformation database and a temperature control actuator unit temperature change influence matrix database are established offline. Regular least square fitting is performed on temperature sensor data on line to obtain a temperature coefficient, linear combination is performed to obtain relative displacement caused by temperature, the relative displacement and relative displacement caused by gravity are superposed to form relative node coordinates, and a reference surface is fitted to output a surface shape relative RMS. And solving quadratic programming based on first-order linearization under temperature upper and lower limits and smoothness constraint to obtain an actuator temperature increment instruction, and issuing the actuator temperature increment instruction, thereby realizing closed-loop compensation without online thermal-structural coupling and absolute morphology measurement.

The embodiment of the invention discloses a temperature compensation circuit. Wherein the first PTAT current generating circuit comprises a first resistor which is configured to output a first linear temperature compensation current with a first temperature coefficient; the second PTAT current generating circuit includes a second resistor configured to output a second linear temperature compensation current having a second temperature coefficient. The first temperature coefficient is different from the second temperature coefficient; and the resistance values of the first resistor and the second resistor are controlled to be equal to the current values of the first linear temperature compensation current and the second linear temperature compensation current at the set temperature. The comparison module is connected with the first PTAT current generation circuit and the second PTAT current generation circuit and is configured to compare the first linear temperature compensation current and the second linear temperature compensation current and output a comparison result. And the switching module is connected with the comparison module and is configured to output nonlinear temperature compensation current after changing the weighting proportion of the first linear temperature compensation current and the second linear temperature compensation current based on the comparison result.

A positive temperature coefficient (PTC) heater apparatus is provided. The PTC heater apparatus includes a PTC heater, a resistance temperature detector (RTD) sensor mounted to the PTC heater and a controller logic unit electrically connected to the RTD sensor to receive readings of the RTD sensor, which, when the PTC heater is powered on, indicate whether the PTC heater is faulty.

A system and method provide on-line, wafer-level, die-level, or package-level thermal calibration of an integrated measurement resistor with a single temperature insertion. The system includes a measurement resistor integrated on a substrate with an unknown temperature coefficient and a temperature reference sensor thermally coupled to the measurement resistor. A measurement circuit measures an indication of a resistance of the measurement resistor. An electrically-controllable integrated heat source is operated by a controller to change a temperature of the measurement resistor and the temperature reference sensor and stores values of the resistance indication and the sensed temperature corresponding to multiple temperatures of the temperature of the measurement resistor and the temperature reference sensor. The controller generates or approximates a mathematical relationship between the resistance of the measurement resistor and the temperature of the measurement resistor and the temperature reference sensor from the stored values.

The invention relates to the technical field of bulk acoustic wave resonators, and particularly provides a bulk acoustic wave resonator and a preparation method thereof.The resonator comprises a first substrate, a coating type structure film layer, a bottom electrode, a piezoelectric layer and a top electrode which are sequentially connected from bottom to top, an acoustic reflector is arranged on the coating type structure film layer, a temperature compensation layer is arranged in the bottom electrode, and the piezoelectric layer is arranged on the top electrode; the temperature coefficients of the bottom electrode, the piezoelectric layer and the top electrode are all opposite to the temperature coefficient of the temperature compensation layer; the resonator can effectively restrain resonant frequency drift generated by the bottom electrode, the piezoelectric layer and the top electrode.

The application relates to the technical field of storage, in particular to a hard disk active heat dissipation intensity control method, device, equipment and storage medium. The method comprises the following steps: evaluating the current period business pressure of a hard disk to obtain a current period business pressure coefficient; predicting a first temperature change value based on the current period business pressure coefficient of the hard disk and a temperature coefficient of the hard disk; obtaining a plurality of actual temperature values measured by a plurality of temperature sensors of the hard disk, and calculating a composite temperature based on the plurality of actual temperature values and the temperature coefficient of each temperature sensor; calculating the difference between the composite temperature and a preset target temperature to obtain a second temperature change value; calculating a next period temperature change value based on the first temperature change value, the second temperature change value, the current period business pressure coefficient and a previous period business pressure coefficient; and adjusting the active heat dissipation intensity of the hard disk according to the next period temperature change value. The scheme can properly use the active heat dissipation, and ensures that the hard disk operates in an optimal state.

This invention provides a method, apparatus, and system for multi-point temperature correction of an array induction logging tool. The method includes: acquiring measurement signals from the array induction logging tool during temperature changes, the measurement signals being detected by a preset number of temperature sensors; constructing a temperature coefficient matrix for each temperature sensor based on the measurement signal, resulting in a preset number of temperature coefficient matrices; calculating a temperature correction coefficient matrix based on each temperature coefficient matrix; acquiring actual measurement signals from the array induction logging tool downhole, and performing temperature correction on the measured signals based on the temperature correction coefficient matrix. The multi-point temperature correction method for an array induction logging tool provided by this invention can calculate the temperature correction coefficient matrix based on the actual measurement signals and correct the measured signals based on the temperature correction coefficient matrix, thus avoiding errors caused by formation temperature changes and improving the accuracy and reliability of the array induction logging tool.

This invention discloses a temperature measuring device and an aerosol generating apparatus, comprising a magnetic field generator, a heating component, and a PCB board. The magnetic field generator generates a changing magnetic field; the heating component is partially disposed within the magnetic field and in contact with the aerosol substrate; the PCB board is connected to both the magnetic field generator and the heating component. The heating component generates heat under the influence of the magnetic field to heat the aerosol substrate. The heating component has a positive or negative temperature coefficient of resistance, and the PCB board determines the temperature of the heating component based on its resistance value when heated. This invention employs a temperature measuring device with a positive or negative temperature coefficient of resistance, i.e., directly measuring the resistance of the heating component and determining its temperature based on its temperature coefficient of resistance. This method yields higher temperature accuracy, and the overall structure of the temperature measuring device is simpler and more integrated, thereby reducing product size and production costs.

The application discloses a cable life prediction method based on an improved electromagnetic-thermal field coupling model, and comprises the following steps: firstly, a temperature coefficient and a proportional coefficient are used to respectively establish an insulation material thermal conductivity coefficient and temperature relationship and a convection heat transfer coefficient and temperature relationship, and the two relationships are used together with a conductor resistivity and temperature relationship as an electromagnetic-thermal field coupling relationship, thereby forming an improved electromagnetic-thermal field coupling model; then, a chaotic grey wolf optimization algorithm is used to identify the optimal temperature coefficient and the proportional coefficient of the insulation material in the improved electromagnetic-thermal field coupling model, and on this basis, the conductor temperature is calculated; finally, a multivariate linear regression is used to establish a conductor temperature analytical model, and an Arrhenius model is used to establish a cable life analytical model. The application solves the problem of large error of a traditional electromagnetic-thermal field coupling calculation method under a high temperature operation condition of a cable, and realizes online prediction of the cable life.

The application provides a distributed rotary scanning probe structure parameter calibration method, and relates to the field of precise optical measurement instrument calibration, and specifically comprises the following steps: establishing a measurement model of a rotary scanning probe; placing a temperature sensor at a heat generating part in a distance measuring system, recording the change relationship between the distance measuring value and the temperature in the stationary working state of the rotary scanning probe, and calibrating the temperature coefficient; performing temperature compensation on the original distance measuring value to obtain a compensated distance measuring value; according to the internal structure of the rotary scanning probe, an initial calibration value is given, point cloud data is subjected to least square ellipse fitting processing, and a fitted radius value is obtained; the fitted radius value of each group of point cloud data is compared with the true circle radius, a PSO-LM hybrid algorithm is used for iteration, and the optimal calibrated structure parameter is obtained. The technical scheme of the application overcomes the problems of the prior art, such as complicated operation, poor fault tolerance and unsuitability for rapid calibration requirements in the production site.

The invention discloses a precision resistor structure with a temperature compensation function. The precision resistor structure comprises a resistor, an IC control chip and an MOS device. The resistor comprises two end electrodes and a first functional layer connected with the two end electrodes, and the first functional layer serves as a current detection unit; the temperature detection unit comprises two bottom electrodes and a second functional layer connected with the two bottom electrodes; and the current detection unit can generate heat and feed back the heat to the temperature detection unit through the substrate for heat conduction when being electrified. The temperature change of the temperature detection unit is fed back as the resistance change, the temperature change of the temperature detection unit can be calculated through the resistance change of the temperature detection unit, and the temperature of the current detection unit can be further fed back. When the temperature of the current detection unit can be detected in real time, an input signal of the current detection unit can be adjusted in real time in combination with a resistance temperature coefficient of the current detection unit, the stability of a circuit communicated with the current detection unit is ensured, and then the stability of a signal in a protected unit circuit is ensured.

The utility model relates to oil field casing drilling, in particular to a sensor for casing screwing-on measurement, and aims to solve the problem that the error correction result is inaccurate due to the temperature difference between the placement position of a temperature sensor and the patch position of a strain gauge and the self measurement error of the temperature sensor. According to the utility model, through the arrangement of the PCB groove, the radio frequency antenna groove and the battery hole, the number of turns of thread rotation in the threaded connection process of casing drilling equipment and the torque generated during thread matching can be monitored at the same time, and the quality of threaded connection between equipment can be ensured more effectively. And the design of a Wheatstone bridge temperature compensation circuit can be completed according to the sensitivity of the negative temperature coefficient of the strain gauge and the resistance change of the positive temperature coefficient. Through the feedback mechanism of the compensation circuit, the reduction of the output voltage of the strain gauge Wheatstone bridge circuit caused by the temperature can be effectively compensated.

This application relates to a resistance temperature coefficient testing device, comprising: a controller; a temperature control stage assembly electrically connected to the controller, the temperature control stage assembly being used to place a sample to be tested, allowing the sample to be subjected to multiple different temperature environments; a temperature testing element for detecting the temperature value at the location where the sample is placed on the temperature control stage assembly; a resistance detection structure including a clamping assembly and at least one pair of probes, the clamping assembly clamping the sample to the temperature control stage assembly, and the probes simultaneously contacting the sample to form a detection circuit to detect the resistance value of the sample; the clamping assembly including a mounting plate having multiple equally spaced mounting holes, into which the probes are inserted. This device can solve the problem of the inability to quantitatively control the probe spacing during repeated testing, improving testing accuracy; in addition, the multiple equally spaced mounting holes on the mounting plate can simultaneously fix multiple pairs of probes, enabling simultaneous testing at multiple sites and improving testing efficiency.

The application discloses a simple and high-precision constant-temperature tank based on logarithmic operation, wherein a detecting element and a heating element are R1 and R2, R1, R2, R3 and R4 constitute a measuring bridge, P1 is used for adjusting the ratio of R3 and R4, the voltage of two opposite diagonal points A-B of the bridge enters operational amplifiers A1 and A2, A1 and A2 are in-phase outputs, and two diodes are connected to two opposite-phase terminals for correcting the nonlinearity of the temperature coefficient of the heating element, so that A1 and A2 each constitute a logarithmic amplifier with the diodes, the outputs of A1 and A2 control transistors TR3 and TR4 respectively, and then control the adjusting tubes TR1 and TR2 of a constant-current voltage stabilizer, the voltage Eo between the emitters of TR1 and TR2 is always kept unchanged, the current io passing through the bridge is also supplied by a constant-current source, and the constant-temperature tank dynamically maintains constant temperature.

The application relates to a multifunctional testing device and testing method for a servo electric cylinder, and belongs to the technical field of device testing. The device comprises a device body, a control module and a sensing module. The device body is used for collecting the actual output thrust of an electric cylinder to be tested, and the device body corrects the PID coefficient of the electric cylinder to be tested under the instruction of the control module. The sensing module comprises a temperature sensor, the temperature sensor is used for monitoring the current ambient temperature w and uploading the ambient temperature w to the control module. The control module is pre-inputted with a plurality of groups of temperature coefficients containing kn and bn. After receiving the temperature data w, the control module selects kn and bn according to the temperature w. The control module corrects the Kp in the PID coefficient of the electric cylinder to be tested to the original A1 times, wherein A1 = kn x w + bn, kn and bn are the temperature coefficients selected by the control module, and n is a natural number. The device has the characteristics of considering the influence of environmental factors and accurate testing results.

The invention discloses a hierarchical alignment method and system for a multi-modal perception data set of a soft manipulator, and the method achieves the coverage of a whole process from data quality evaluation to feature space alignment to semantic consistency optimization through the three-stage design of single-modal noise evaluation, feature-level adaptive alignment and semantic-level constraint alignment. The limitation that a traditional method only pays attention to single-level alignment is broken through, and the model can gradually adapt to the complex characteristics of touch multi-mode perception. Secondly, an adaptive temperature function is designed based on modal pair comprehensive reliability, and a strict monotone mapping relation between temperature coefficients and modal noise characteristics is established, so that a high-noise modal pair automatically obtains a relatively large temperature coefficient to enhance robustness, and a low-noise modal pair automatically obtains a relatively small temperature coefficient to improve alignment precision; the technical problem that the fixed temperature coefficient cannot adapt to the touch multi-mode heterogeneous noise characteristic is fundamentally solved, and end-to-end sensitivity adjustment is achieved through the global learnable self-adaptive adjustment coefficient.

The invention discloses a temperature coefficient compensation method and system for a deflection angle sensor, and relates to the technical field of automatic driving of agricultural machinery, and the method comprises the steps: fitting a relation between a temperature drift value of the deflection angle sensor and temperature through a polynomial based on temperature-drift relation data; based on the temperature sensor value, a Kalman filtering algorithm is adopted to estimate a temperature true value; calculating a temperature variation according to the temperature true value and the temperature sensor value, and if the absolute value of the temperature variation is greater than or equal to the temperature variation threshold value, calculating a deflection angle sensor compensation value based on a polynomial; and continuously compensating the deflection angle sensor based on the deflection angle sensor compensation value. According to the invention, the stability and accuracy of temperature compensation in a complex environment are guaranteed.

The invention discloses a high-temperature-resistant weighing sensor with a self-calibration function, relates to the technical field of weighing sensors, and aims to solve the technical problem of measurement misalignment caused by thermal drift and sensitivity attenuation of a traditional sensor in a high-temperature environment, and the high-temperature-resistant weighing sensor comprises a sensing module, a self-calibration execution module and a signal processing and control module. By means of a real-time temperature compensation algorithm based on multi-parameter fusion, an accurate compensation model is established for the problems of zero drift and sensitivity drift in a high-temperature environment. Non-linear zero drift is corrected through a piecewise polynomial fitting function, meanwhile, the change of sensitivity along with temperature is adjusted through a temperature coefficient correction function, dynamic compensation in a full working temperature range is achieved, it is ensured that the sensor can still keep stable measurement precision in a high-temperature environment, and the measurement accuracy of the sensor is improved. The problem of measurement misalignment caused by thermal drift and sensitivity attenuation of a traditional sensor in a high-temperature environment is solved.

The application provides an oscillator-based temperature sensor and a sensor assembly. The temperature sensor comprises: a first oscillator generating a first clock signal of a first frequency, an absolute value of a temperature coefficient of the first clock signal being greater than or equal to a first predetermined value; a second oscillator generating a second clock signal of a second frequency, the second frequency being higher than the first frequency, an absolute value of a temperature coefficient of the second clock signal being less than a second predetermined value; a counting and control unit timing based on the first clock signal to obtain a predetermined time length; a counter counting the second clock signal to obtain and output a count value within the predetermined time length; and a calculation unit calculating a current digital temperature value according to a calibration count value output by the counter at a predetermined calibration temperature, a measurement count value output at a current temperature, and a linearly fitted temperature coefficient.

The present application relates to the field of power equipment maintenance, and more particularly to a live working complete tool and a line clamp oxidation degree detection method, comprising obtaining contact resistance original data and environmental temperature data of the line clamp in live working; adopting four-wire method to exclude wire resistance interference and calculate the original contact resistance value of the line clamp; based on the temperature coefficient of copper material and the influence coefficient of oxide layer, temperature compensation correction is performed on the original resistance value to obtain the actual contact resistance value; according to the actual contact resistance value and the wear trend, the oxidation grade of the line clamp is dynamically determined and the maintenance threshold is adjusted. After obtaining the contact resistance original data and environmental temperature data of the line clamp, the four-wire method is used to exclude wire resistance interference to preliminarily calculate the original contact resistance value of the line clamp, and then the temperature compensation correction is performed on the original resistance value to obtain the actual contact resistance value, so as to dynamically determine the oxidation grade of the line clamp and adjust the maintenance threshold according to the actual contact resistance value and the wear trend.

The invention provides an indexing calibration method for a negative temperature coefficient thermistor temperature sensor, and the method comprises the steps: building a mathematical model of a reference polynomial of a reference coefficient fixed value based on a plurality of high-stability reference NTC thermistors; determining the weight coefficient of each thermometer in the reference coefficient fixed value according to the reciprocal ratio of the maximum temperature drift amount corresponding to the water three-phase point resistance value of each thermometer; and establishing a quadratic polynomial function relationship between the deviation value of the resistance natural logarithm ratio of the detected NTC thermistor and the reference NTC thermistor and the resistance natural logarithm ratio of the detected NTC thermistor, thereby constructing a novel indexing calibration mathematical model of the NTC thermistor. The mathematical model has universality and can be suitable for various types of NTC thermistors.

The present application relates to the technical field of resonators, and discloses an array structure-based resonator and a temperature measurement method. A vibration unit comprises at least two substructures and a fixing anchor point connected to a substrate; a reference plane is formed for the vibration unit; an in-plane electrode is located in the reference plane; an out-of-plane electrode is located outside the reference plane; the in-plane electrode drives the substructures to vibrate at a first frequency; the out-of-plane electrode is located above and / or below the substructures, and drives the substructures to vibrate at a second frequency; each substructure has a first temperature coefficient of frequency at the first frequency in an in-plane mode; and the substructure has a second temperature coefficient of frequency at the second frequency in an out-of-plane mode. In the array structure-based dual-mode resonator of the present application, the temperature of the resonator is represented on the basis of temperature coefficients of frequency, thereby improving the temperature measurement accuracy of the resonator.

This invention specifically relates to a method for correcting the critical boron concentration under full power conditions. Based on a three-dimensional reactive equilibrium equation and considering the influence of temperature deviation on the Doppler effect, the critical boron concentration under full power conditions is: where CB ref This represents the critical boron concentration at full power; CB m ρ represents the actual boron concentration under the measured conditions. xem Indicates the equilibrium xenon poisoning under measurement conditions; ρ xeref This represents the balanced xenon poisoning at full power; ρ rccam Indicates the reactivity introduced by the control rod under measurement conditions; pr m Indicates the actual power under the measured conditions; HFP represents full power; α pc α represents the average of the sum of the power coefficients under the measured state and the full-power state; b T represents the average of the sum of the differential boron values ​​under the measured state and the full-power state; avgm T represents the average temperature of the moderator under the measured conditions. ref (pr m ) represents the moderator reference temperature under measurement conditions; α ttcm This represents the total temperature coefficient under the measurement conditions. The invention also relates to computer equipment and a computer-readable storage medium, outlining the steps for implementing the above-described method for correcting the critical boron concentration under full power conditions. Based on a three-dimensional reactive equilibrium equation, and considering the influence of temperature deviation on the Doppler effect, this invention achieves accurate correction of the critical boron concentration under full power conditions when nuclear power units increasingly participate in peak shaving.

The invention provides optical glass which has optical characteristics of high refractive index and high dispersion, and is helpful for correcting the influence of temperature change on imaging characteristics. The optical glass contains, in mass%, more than 0% and 35.0% or less of a B2O3 component, 1.0% or more and 50.0% or less of an Ln2O3 component (in the formula, Ln represents one or more elements selected from the group consisting of La, Gd, Y and Yb), and 10.0% or more and 50.0% or less of a BaO component, the sum of mass of TiO2 + ZrO2 + WO3 + Nb2O5 + Ta2O5 is more than 0% and 50.0% or less, and the optical glass has a refractive index of 1.75 or more and an Abbe number (vd) of 18 or more and 42 or less. And the temperature coefficient (40-60 DEG C) of the relative refractive index (589.29 nm) is within the range of + 4.0 * 10 <-6 >-10.0 * 10 <-6 > (DEG C <-1 >).

The present disclosure provides a method, system and device for improving the accuracy of the frequency of an excitation control system, the method comprising: presetting an initial frequency maximum value and an initial duty cycle maximum value of the excitation control system; obtaining a maximum duty cycle output when the locomotive is under a self-load full load test; obtaining a temperature coefficient conversion value of the excitation winding in the excitation control system; determining a duty cycle maximum value in use according to the maximum duty cycle and the temperature coefficient conversion value; obtaining a duty cycle output in use of the excitation control system; and calculating a control frequency output by the excitation control system according to the duty cycle maximum value in use, the duty cycle output in use and the initial frequency maximum value. The method, system and device provided by the present disclosure optimize the duty cycle of the excitation system, ensure the output accuracy of the frequency, further improve the accuracy of the output voltage, and ensure the stability and reliability of the output signal.

The invention discloses a zinc oxide arrester resistor disc temperature rise and stress estimation method considering a temperature coefficient and a skin effect, and belongs to the technical field of zinc oxide arrester resistor disc temperature rise and stress estimation. In order to solve the defect of large simulation result difference under different initial conditions, the influence of the temperature coefficient and the skin effect on temperature rise and stress is considered, the temperature difference of all positions of the lightning arrester resistor disc under the lightning impulse can be reflected, stress estimation is achieved, and compared with a traditional model only calculating the overall temperature rise, the method has the advantage that the calculation efficiency is improved. According to the invention, the local temperature difference and the stress breaking probability of the resistor disc can be obtained, the aging state evaluation precision of the lightning arrester is improved, and the reliability of the lightning arrester and the operation of a power grid is improved.

The invention discloses a temperature coefficient-nonlinearity joint compensation method of an I / F conversion circuit, and solves the problem that the compensation precision of the I / F conversion circuit is relatively low because the temperature coefficient compensation and the nonlinearity compensation of the traditional I / F conversion circuit are independently completed and the nonlinearity in a full temperature range and the temperature coefficient index in a full range cannot be considered at the same time. Temperature coefficient compensation and non-linearity compensation are effectively combined, the non-linearity of the circuit at each temperature point in the full-temperature range can be reduced, the temperature coefficient of the circuit working at any current point in the full range is reduced, and the requirements of different working environments for the precision of the full range and the full-temperature range of the I / F conversion circuit are met.