124 results about "Temperature coefficient" patented technology

The invention relates to the technical field of temperature measurement, in particular to a multi-zone temperature distribution real-time calibration method based on a heating body, which comprises the following steps of: 1, etching on the surface of a metal alloy heating body of which the resistance temperature coefficient is greater than a preset material threshold value to form N discrete series resistance heating units which are electrically connected in series but thermally discrete; 2, establishing a resistance-temperature dynamic relation library of each discrete series resistance heating unit; 3, synchronously measuring the real-time resistance value of each unit when the heating body works; 4, reversely deducing the temperature of a unit center point through a unit exclusive relational expression according to the real-time resistance value, and reconstructing a continuous temperature distribution matrix on the surface of the heating body in combination with a heat conduction equation; and 5, comparing the target temperature field with the real-time temperature field matrix, and adjusting the driving power of the corresponding unit in the out-of-tolerance region. Through continuous calibration and temperature adjustment, accurate control of a temperature field can be maintained in different use environments.

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.

The invention provides a temperature distribution inversion method based on a multi-vertex grid and a high-robustness error functional, and the method comprises the steps: 1, obtaining a temperature gradient change rule of a measured structure under a typical thermal load condition, and determining a three-dimensional multi-vertex grid division scheme and a temperature sensor layout form of the measured structure; step 2, establishing an m vertex grid basis function model, and constructing a conversion matrix between a regular grid and an irregular grid; 3, establishing a high-robustness error functional between the theoretical temperature of the centroid position of each surface of the m-vertex grid and the actually measured temperature of the sensor; 4, a temperature matrix equation containing a temperature coefficient matrix and a temperature amplitude matrix is constructed, temperature vectors of all grid vertexes are solved, the m-vertex grid basis function model is combined, three-dimensional temperature distribution in the structure space is inverted, and according to the method, only few sensors need to be adopted, the global temperature response of the structure can be obtained, and the inversion precision is high; the method is simple, convenient and high in real-time performance.

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

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

The invention provides a delta-sigma temperature sensor of positive temperature coefficient reference voltage, the delta-sigma temperature sensor is used for obtaining a temperature value according to an input voltage, a first temperature proportionality coefficient exists between the input voltage and the temperature, the delta-sigma temperature sensor comprises a reference voltage generating circuit, an integrating circuit and a quantizer, the reference voltage generating circuit is used for generating a positive temperature coefficient reference voltage and outputting the positive temperature coefficient reference voltage to the integrating circuit, the positive temperature coefficient reference voltage is in direct proportion to the temperature and has a second temperature proportionality coefficient, and the second temperature proportionality coefficient is smaller than the first temperature proportionality coefficient; the integrating circuit is used for amplifying and accumulating a difference value between the input voltage and the positive temperature coefficient reference voltage and outputting an integral output signal; the quantizer is configured to output a bitstream according to the integrated output signal.

A method for calibrating a micro-electro-mechanical system (MEMS) gyroscopes by determining a plurality of variates including quadrature and inphase values from output data of a first subset of the MEMS gyroscopes, determining offset temperature coefficients of the first subset of the MEMS gyroscopes over temperature variation, computing a linear regression using the quadrature and inphase values and the offset temperature coefficients to determine linear regression variate coefficients for predicting the offset temperature coefficient based on the quadrature and inphase values. The method also including determining a plurality of variates including quadrature and inphase values from output data of a second subset of the MEMS gyroscopes, determining a predicted offset temperature coefficient based on the quadrature and inphase values and the linear regression variate coefficients, and programing the second subset of the MEMS gyroscopes to use the predicted offset temperature coefficient to adjust the output data during operation.

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 discloses a series of high-stability negative temperature coefficient heat-sensitive materials based on seven-principal-element high-entropy rare earth stannate and application, and aims to solve the problem that existing stannate heat-sensitive materials with pyrochlore structures cannot meet long-term application in high-temperature environments. The series of heat-sensitive materials are prepared by mixing lanthanum trioxide, neodymium oxide, samarium oxide, europium oxide, gadolinium oxide, dysprosium oxide and tin dioxide with erbium oxide or ytterbium oxide respectively, and the preparation process comprises the steps of wet three-dimensional vibration ball milling, powder calcination, cold isostatic pressing, high-temperature sintering and the like. And finally obtaining the negative temperature coefficient heat-sensitive material with the pyrochlore structure. The electrical property parameters of the series of materials are as follows: B is equal to 13914-14067 + / -1.89% K, and rho 1500 DEG C is equal to 180.26-204.09 + / -1.38% omega.cm. The negative temperature coefficient heat-sensitive material has the negative temperature coefficient characteristic in the wide temperature range of 400-1500 DEG C and shows excellent high-temperature aging stability under the high-temperature condition of 1500 DEG C, and the resistance drift rate of the negative temperature coefficient heat-sensitive material is only 0.7% after an aging test for 500 hours.

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.

To provide a technique capable of appropriately identifying a percentage content of at least one kind of gas included in a mixture gas without being influenced by an aging deterioration of a temperature sensor.SOLUTION: A sensor module (1) includes: a heater (H1); a first temperature sensor (Th1) configured to measure a first temperature of a mixture gas at a heatable first location; a second temperature sensor (Th2) configured to measure a second temperature (T0) of the mixture gas at a second location not to be heated; and a control device (100). The control device (100) calculates the first temperature when the first temperature sensor (Th1) is heated, according to an electrical resistance of the first temperature sensor (Th1) when not heated and an electrical resistance of the first temperature sensor (Th1) when heated, a temperature resistance factor of the first temperature sensor (Th1) calculated according to the electrical resistance of the first temperature sensor (Th1) when not heated and the second temperature calculated according to an electrical resistance of the second temperature sensor (Th2).SELECTED DRAWING: Figure 9

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.

[Problem] To quickly and accurately estimate the constantly changing heating temperature of water or other contents contained in an electric kettle using the temperature of a heater without directly measuring the temperature of the contents. [Solution] A device for contactlessly receiving power from a power supply coil (13) of a power supply base (27) through a power receiving coil (14) of an electric kettle (28) and heating a content (36) through a built-in heater (18), the device comprising: a power supply circuit (19) for supplying power to the heater (18); a temperature sensor (22) that detects the temperature of the heater (18); a control unit (20) that controls the energization of the heater (18); a temperature storage unit (25) that stores the temperature detected by the temperature sensor (22) via the control unit (20); an estimated temperature coefficient storage unit (29) that stores a predetermined unique estimated temperature coefficient (Ce) of the electric kettle (28); and a temperature estimation unit (26) that estimates the temperature of the content (36) on the basis of the data stored in the temperature storage unit (25) and the temperature estimation coefficient (Ce).

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 present invention discloses a preparation method of a negative temperature coefficient thermistor material Sr8Ti7S 21 to solve the problems of difficult preparation and high resistance of current thermistor materials. The preparation method includes the following steps: using SrTiO3 powder as a raw material, performing a sulfidation reaction to obtain Sr8Ti7S 21 powder; hot-pressing the obtained Sr8Ti7S 21 powder to obtain a Sr8Ti7S 21 green body; performing high-temperature sintering on the obtained Sr8Ti7S 21 green body, and then a negative temperature coefficient thermistor material Sr8Ti7S 21 can be obtained. Based on different sintering temperatures, the present invention can obtain a negative temperature coefficient thermistor Sr8Ti7S 21 with a room temperature resistivity of 0.7 - 15.9 Ω·cm, which shows a good resistance-temperature correlation and has good application prospects in the field of temperature detection and other fields.

The invention provides a digital trimming device and method based on a compensation current temperature coefficient, relates to the technical field of operational amplifier trimming, and aims to enable an offset voltage of an operational amplifier to be accurately compensated and to have better temperature excursion through the temperature coefficient of an offset compensation current generated by the digital trimming device. The digital trimming device comprises a common-mode detection module, a digital logic control module, a fuse array module, a digital analog converter module and a total fuse switch module, wherein the common-mode detection module is configured to be capable of reducing the temperature coefficient of the reference current output to the digital analog converter module by the common-mode detection module by utilizing the negative temperature coefficient characteristic of triode base-emitter voltage, so that the influence of the temperature on the compensation current is reduced.

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 belongs to the technical field of nuclear power, and particularly relates to a nuclear reactor core isothermal temperature coefficient estimation method and device, a computer readable storage medium, electronic equipment and a computer program product. The method comprises the following steps: acquiring isothermal temperature coefficient measurement data of a nuclear reactor core; segmenting the isothermal temperature coefficient measurement data to obtain data of each segment; performing linear fitting on each piece of segmented data to obtain a fitting slope of each piece of segmented data; and determining an isothermal temperature coefficient estimation result of the nuclear reactor core according to the fitting slope of each piece of segmented data. According to the method and the device, the isothermal temperature coefficient measurement data are not used as a whole for simple linear fitting any more, the isothermal temperature coefficient measurement data are segmented, linear fitting is respectively carried out on each segmented data, and then the fitting slope of each segmented data is comprehensively considered to determine the final isothermal temperature coefficient estimation result. Therefore, the precision of the estimation result is effectively improved.

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.