474 results about "Temperature error" patented technology

Systems, apparatus, and methods of controlling a variable-speed fan of an environmental maintenance module that controls temperatures of a plurality of zones of a building are provided. A first critical zone of the building is identified by analyzing the first zone temperature errors, which are used to determine a final speed setting of the variable-speed fan. Systems, apparatus, and methods of calibrating an environmental maintenance module that controls a temperature of a zone of a building are also provided. A location parameter is calculated for a plurality of zone temperatures, and a scale parameter is computed that quantifies a variation of the zone temperatures relative to a location parameter. A first temperature setpoint for the zone is determined and used in controlling the temperature of the zone.

The invention discloses a compensation method for error calibration of an MEMS gyroscope in an MIMU. The method uses a novel error model of the MEMS gyroscope. The method can complete calibration for non-orthogonal errors and temperature errors of the MEMS gyroscope in cases of existing devices: a rotary table with a thermostat and a single shaft being capable of rotating in 360 DEG, and a rotary table without a thermostat and with dual shafts being capable of rotating in 360 DEG; and does not introduce secondary mounting errors, thereby ensuring a calibration precision, overcoming restrictions of calibration devices, and well compensating non-orthogonal errors and temperature drift errors. According to the invention, in a full temperature range, a maximum output error of the MEMS gyroscope is only 0.2 DEG / s, and triaxial errors are also consistent.

The invention relates to an on-line detection system and detection method of machining accuracy of parts for a numerically controlled lathe. The detection system comprises a chuck, a workpiece and a lathe probe, wherein the workpiece is arranged on the chuck, and the lathe probe is arranged at the side of the workpiece; and a signal output terminal of the lathe probe is connected with a controller of the detection system. The detection method comprises the following steps that 1) the lathe probe is arranged at the side of the workpiece; 2) the lathe probe is calibrated; 3) the measuring path and code generation of geometrical parts and curved-surface parts are planned; and 4) the heat distortion temperature error compensation and machining error analysis of parts are carried out by the controller of the detection system. The parts do not need to leave the lathe after being machined, a touch probe is used for replacing a turning tool, and the detection path of the probe is automatically planned and the detection code is generated according to the geometric outline and detection items of the machined workpiece; and through a communication interface of the numerically controlled lathe, the detection code is driven, so that the automatic measurement of the size and precision of size and form of the machined part is realized, and the detection accuracy and efficiency of the workpiece are improved.

The invention relates to a temperature conversion method and a low-power high-precision integrated temperature sensor. The low-power high-precision integrated temperature sensor is composed of a band gap reference circuit with a sensing core, a positive and negative synchronous switch capacitor integral circuit, a current source and a sampling capacitor dynamic element matching module, a clock generating circuit, a divider and buffer circuit and a fully differential analog-to-digital converter. The sensing core circuit in the traditional technology and the band gap reference circuit are combined and integrated, so that the circuit structure is simplified; the current source dynamic element matching module is arranged and thus a base-emitter junction voltage difference in proportion to the absolute temperature is generated, wherein the polarity of the voltage difference changes alternately; with the novel positive and negative synchronous switch capacitor integral circuit, the improved temperature conversion function is completed and the dynamic range utilization rate of the analog-to-digital converter is improved; dynamic element matching is carried out on the sampling capacitor, thereby improving the integral accuracy; and the analog-to-digital converter is used for carrying out quantization processing on an effective temperature signal to provide a digital output. Therefore, the temperature error and circuit power consumption of the sensor can be effectively reduced; and the method and the sensor are suitable for the low-power high-precision temperature sensing application.

The invention provides a method for carrying out ultrasonic inspection on residual stress of an aluminium alloy pre-stretching board by water immersion, belonging to the field of non-destructive inspection. The method comprises the following steps of preparing a reference block; carrying out measurement and calibration; measuring the residual stress. In the method, the water immersion method is adopted, and the temperatures in stress calibration and stress measurement processes can be ensured to be consistent by controlling the water temperature not to be changed, thus eliminating the effects of temperature difference on the ultrasonic wave speed and eliminating temperature errors; besides, an automatic scanning frame is adopted instead of manual scanning, so that the distance between a probe and the surface of a material to be measured in the measurement process can be ensured not to be changed, thus eliminating the effects of coupling condition difference on sound propagation time and eliminating the coupling errors. The method is beneficial to non-destructive evaluation of the near surface residual stress of the aluminium alloy pre-stretching board.

The invention relates to a method for compensating the temperature error of an inertial device. The method comprises the following steps of: performing analogue-to-digital (AD) sampling on the output voltage and the power supply voltage of the inertial device simultaneously and resolving the angular velocity information of a gyroscope (or acceleration information of an accelerometer) by using the ratio of two sampling values; and establishing a temperature error model of the angular velocity information (or the acceleration information) to compensate. The method has the advantages of eliminating the influences of temperature drifts of the power supply voltage of the inertial device and the reference voltage of an AD switching circuit on the output accuracy of the device, greatly simplifying the temperature error model of the inertial device and enhancing the temperature error compensation accuracy of the device.

The invention discloses a roadway surrounding rock stress monitoring device based on fiber bragg grating sensing. Grooves are symmetrically carved in a metal rod along the axial center, an FBG set is fixedly installed inside each groove, FBGs serve as sensitive elements, when roadway surrounding rock is deformed, the stress of the surrounding rock will be changed, therefore, force is generated through the metal rod, surface micro-deformation is generated, the grating distances of the FBGs attached to the metal rod are changed along with the metal rod, the center reflection wavelength of the FBGs can be caused to generate drifting, wavelength signals are demodulated into electrical signals through an FBG interrogator, and the stress situations of different sites can be obtained. The roadway surrounding rock stress monitoring device has the advantages that installation is easily achieved, and the roadway surrounding rock stress monitoring device is suitable for wide popularization; power is not required to be supplied to the working face end, and site safety is guaranteed; all-optical measurement and fiber transmission are adopted, and influences of electromagnetic interference are effectively avoided; the temperature error is compensated, and the accuracy is improved; the surrounding rock stress monitoring results can be timely and accurately provided, and guidance on site production and scientific research is facilitated.

The invention belongs to the technical field of all-fiber current transformers, and particularly relates to a high-precision high-reliability and all-fiber current transformer. A redundancy design method adopting active optical devices is applied so that output optical power of light source units is enabled to be more stable and stability of light source average wavelength is enhanced. A depolarization head is additionally arranged in an optical path system so that stability and measurement precision of the optical path system can be enhanced. Two beams of light are converted into electric signals to be transmitted to a signal processing unit by utilizing correlation of output light of the two output ends of a second single-mode coupler through a digital signal processing unit, and suppression of light source intensity noise is realized by utilizing a digital circuit subtraction method so that signal-to-noise ratio is enhanced and measurement precision of the system is enhanced. A low birefringence optical fiber Verdet constant and a transformation ratio error generated by change of wave plate phase delay along with temperature are enabled to be mutually compensated via an all-fiber current transformer transformation ratio temperature error automatic compensation technology so that full-temperature measurement precision of the system is enhanced.

An optical fibre gyroscope distributed layered temperature error compensation method comprises the following steps: (1) five optical components of a fiber-optic ring, a light source, a Y wave guide, a detector and a coupler are taken as temperature monitoring objects for determining the number of the temperature monitoring points of each optical component and the distributing form; (2) self-adapting recurrence and least squares treatment are carried out on monitoring value of each temperature monitoring point for obtaining temperature output value of the optical fibre gyroscope; (3) a neural network model is built for obtaining temperature drift compensation value by utilizing the temperature output value and the real time outputting data of the optical fibre gyroscope; (4) the real time outputting data of the optical fibre gyroscope minus the temperature drift compensation value means temperature compensation of the optical fibre gyroscope. The method can overcome the disadvantages of the prior art and reflect the temperature field inside the optical fibre gyroscope systematically and in an all-round way, and has significance in the performance research and improvement under the condition of the temperature environment of the optical fibre gyroscope.

The invention provides a method for accurately calibrating temperature error coefficients of a laser gyro inertia measurement unit. In the method, a three-axle table with a thermostate is utilized to enable an LIMU to achieve whole thermal balance through a measure of performing long-term heat preservation at a certain temperature spot; system inherent error coefficients such as a gyro scale factor, a gyro literal drift, an accelerometer scale factor, an accelerometer literal bias and the like at the temperature spot are accurately calibrated through a calibration method of combining dynamic rotation and static 24 position; and then high and low temperature cycling tests are performed on the LIMU by utilizing the inherent error coefficients of the LIMU at the temperature spot, so that the temperature error coefficients comprising 30 temperature related coefficients such as a primary temperature coefficient, a secondary temperature coefficient, a temperature gradient coefficient and a temperature change rate coefficient of the gyro literal drift and accelerometer literal bias are further calibrated. The method provided by the invention has the characteristics of high accuracy and simplicity in operation, and can be used for greatly improving the use accuracy of the LIMU under a variable temperature environment.

The invention proposes a method for correcting the resting result of infrared temperature measurement equipment, and various types of infrared temperature measurement equipment as a research object. The data measured by the infrared temperature measurement equipment is corrected manually, and the corrected data is close to the real temperature of the object. The method comprises the steps: testing the function variables corresponding to a model and a formula through presetting a testing module and a calculation formula; carrying out the fitting of the measured data through software, determining the coefficient and multiplier of the calculation formula, and forming a complete calculation formula; and calculating the accurate temperature of the target under the same measurement condition no matter how the function variables change. The method is suitable for the correction of the target temperature of the infrared temperature measurement equipment with various types of precision and applicable temperature ranges under the complex conditions. The method has obvious advantages for the measurement of the temperature of steel ingot. The method can overcome the temperature errors, caused by the temperature, distance and angle changes, of the infrared temperature measurement equipment, and achieves the purpose of measuring temperature quickly, accurately and safely.

A mechanical temperature instrument error prediction method based on a genetic-algorithm optimized least square support vector machine is disclosed. The method comprises the following steps of (1) taking a tested characteristic parameter of a mechanical temperature instrument as model input, and taking an instrument error value and an error change rate acquired through sampling as model output; (2) carrying out pretreatment on original temperature error data; (3) selecting a Gauss radial kernel function as a kernel function of a least square support vector machine model; (4) using a genetic algorithm to optimize a parameter combination of the least square support vector machine; (5) constructing a mechanical temperature instrument error prediction model based on the genetic-algorithm optimized least square support vector machine; (6) inputting a data set and using a model obtained through training to carry out prediction; (7) comparing a temperature instrument error prediction result with an actual temperature error and analyzing a temperature error value and a change trend of a temperature error change rate. By using the method, precision is high; calculating is simple and engineering practicality is high.

The invention discloses a numerical control machine tool space error modeling method based on a space grid compensation mode. The numerical control machine tool space error modeling method mainly comprises the following steps that step one, a three-axis numerical control machine tool space error universal model is established by utilizing a homogenous coordinate transformation method based on the multi-body system theory according to the type of a machine tool; step two, 21 geometric error elements in the model are measured by using a laser interferometer and modeling is performed; and step three, numerical control machine tool space error is compensated. According to the modeling method, static geometric error and dynamic thermal error modeling methods are integrated, a comprehensive model expression combination is separated into independent position influence terms and temperature influence terms, a space grid compensation list mode is adopted for the position error influence terms, and a real-time acquisition mode is adopted for the temperature error influence terms so that comprehensive compensation is realized. Therefore, the modeling method is scientific and effective and has the characteristics of being easy to compensate and convenient to apply.

The invention relates to the field of related clock error compensation technology, and in particular relates to a clock-temperature-error compensation method and a system thereof. The clock-temperature-error compensation method comprises the following steps of: measuring the temperature at initial time, obtaining and storing a first temperature value, and storing the first temperature value; after measuring time T, measuring the temperature again and obtaining a second temperature value; adopting the first temperature value or the second temperature value as the measuring temperature, and according to the relation between the measuring temperature and the clock crystal-oscillator error, calculating and obtaining an error value of a clock; calculating a clock error of the measuring time T; repeatedly executing the steps from step 2 to step 4, till the clock error accumulated value is larger than a preset clock adjusting threshold, adding the value same as the clock adjusting threshold for the clock, and executing the steps from step 2 to step 4 again. The clock-temperature-error compensation method has the advantages that the clock compensation can be realized only by using the common circuit and algorithm without needing to use GPS or a function clock chip with expensive price and adjustable oscillating circuit frequency, so that the production cost is greatly reduced.

The invention discloses a method for simultaneously compensating a scale factor and a zero offset of an optical fiber gyroscope by a one-time temperature experiment. The method comprises the following steps: (1) adjusting the temperature of an incubator, rotating the gyroscope clockwise and anticlockwise when the temperature reaches respective set temperature values, and acquiring temperature data acquired by a temperature sensor in the gyroscope in real time and data which correspond to the temperature and are output by the gyroscope in the whole process of switching on and switching off the incubator; (2) processing the temperature data and the data output by the gyroscope according to a simultaneous scale factor and zero offset compensation algorithm, and obtaining a temperature compensation coefficient matrix; (3) compensating the output of the gyroscope according to the temperature compensation coefficient matrix. According to the compensation method provided by the invention, the one-time temperature experiment is designed to simultaneously compensate the scale factor and the zero offset of the optical fiber gyroscope; a relation between a digital value output by the gyroscope and an input angle speed is directly expressed, so that the compensation coefficient matrix is obtained; therefore, the inaccuracy, which is caused by a zero offset error and the like, of compensation of the scale factor is avoided; furthermore, the temperature error of the gyroscope can be effectively compensated, and the method can save the experiment cost and is higher in practical significance.

The embodiment of the invention provides a depth image calibration method and system for a TOF camera system, and the method comprises the steps: obtaining a corresponding depth image according to anoriginal phase image collected by the time-of-flight TOF camera system; And respectively carrying out geometric correction, time domain noise reduction and spatial domain noise reduction processing, FPPN correction, Wiggling correction and temperature error compensation on the depth image to obtain a calibrated depth image. multi-aspect calibration is carried out on a depth image; geometric correction, time domain noise reduction and spatial domain noise reduction processing, FPPN correction, Wigning correction and temperature error compensation are carried out, errors introduced from multipleaspects are eliminated, a calibrated depth image is obtained, so that the measurement error is greatly reduced, the reliability of the finally obtained depth image is greatly enhanced, and the methodcan be further applied to various depth applications.

The invention discloses a PID temperature control method that employs the follow-up control-based temperature-increasing and / or temperature-decreasing process. The method specifically comprises the steps of presetting a temperature / time curve, obtaining the temperature measurement value of a controlled object at the current time, calculating a temperature target value at the current time according to the temperature / time curve, conducting the PID operation according to the temperature measurement value and the temperature target value at the current time, and adjusting the output power according to the result of the PID operation so as to complete the power adjustment at a time. The invention also discloses a PID temperature control module. The PID temperature control module comprises a temperature measurement value acquisition unit, a follow-up control temperature target value calculation unit, a PID operation unit and an output unit. According to the technical scheme of the PID temperature control method and the PID temperature control module, the temperature-increasing and temperature-decreasing process is controlled in the follow-up control manner. Therefore, the temperature can be increased or decreased at a constant speed according to a well designed temperature increasing / decreasing curve. The heating power is controlled to fluctuate within a relatively small range. The temperature error caused by the large inertia can be reduced. Meanwhile, the accuracy of temperature control is improved.

The invention relates to a self-tuning PID energy-saving temperature control method. The method comprises the steps that a target temperature value, a control period, a sampling period and a thresholdtemperature difference are set first; load heating power is increased; the current regional temperature sampling value of a controlled object is acquired, and the sampling period is combined to calculate the temperature rise rate; a PSO-DE algorithm combining particle swarm optimization (PSO) and differential evolution (DE) is used to adjust and calculate PID control parameters; the duty cycle ofthe output pulse of a control period is adjusted according to the operation result; heating power output is adjusted, so that the sampled temperature sampling value is approximately equal to the actual temperature value of the controlled object; a temperature error caused by the heating inertia is reduced; heating power is accurately controlled; and the energy saving effect is obvious. A self-tuning PID energy-saving temperature control module comprises the self-tuning PID energy-saving temperature control method, can accurately control the heating power, and has an obvious energy-saving effect.

Systems, apparatus, and methods of controlling a variable-speed fan of an environmental maintenance module that controls temperatures of a plurality of zones of a building are provided. A first critical zone of the building is identified by analyzing the first zone temperature errors, which are used to determine a final speed setting of the variable-speed fan. Systems, apparatus, and methods of calibrating an environmental maintenance module that controls a temperature of a zone of a building are also provided. A location parameter is calculated for a plurality of zone temperatures, and a scale parameter is computed that quantifies a variation of the zone temperatures relative to a location parameter. A first temperature setpoint for the zone is determined and used in controlling the temperature of the zone.

The invention provides a depth camera temperature error correcting method and system. The method comprises: acquiring a spot image of a current target by using a depth camera, and calculating a deviation value between pixels corresponding to the spot image and a reference spot image; modeling the measurement error of the depth camera caused by temperature change; correcting the current measurementdeviation value by utilizing the modeled measurement error, and calculating a depth image according to the corrected deviation value. A relation model between the temperature change and the depth measurement error is established, and a relatively real depth value can be directly calculated by obtaining the distance change between a lens and an image sensor of an acquisition module caused by the temperature change, so the measurement precision of the depth camera can be improved.

The present invention is directed toward a laser wavelength locking scheme suitable for incorporation into WDM systems having channel spacings of 25 GHz or less. In a preferred embodiment, light output from the laser is supplied to a filtering element, such as an in-fiber Bragg grating or an etalon, and photodetectors are used to sense light transmitted through and either reflected by the filtering element or input to the filtering element. A measured ratio corresponding to a quotient of the photocurrents generated by the photodetectors is calculated and compared to a desired ratio corresponding to a measured temperature of the filtering element when the filtering element transmits the desired wavelength to be locked. Based on the comparison of the desired and measured ratios, a temperature error value is calculated which is used to adjust the laser temperature, as well as the laser wavelength. Accordingly, the temperature of the filtering element, for example, influences the laser temperature, so that wavelength variations stemming from temperature induced changes in the filtering element and other components in the laser package can be compensated, and the output wavelength can remain substantially fixed.

The invention discloses a test structure for measuring the thermal conductivity of a film, which comprises a substrate and an insulating layer arranged on the substrate, wherein a test unit is arranged on the insulating layer, and the test unit comprises a reference unit and a test unit. The structure has simple preparation process and convenient test and is particularly suitable for measuring the thermal conductivity of a silicon nitride (Si3N4) film in a natural air environment. An S-shaped heater made of platinum (Pt) is adopted and can achieve more uniform heating temperature and reduce temperature error, and moreover, the S-shaped heater has higher test precision.

The invention discloses a real-time monitoring and analyzing system for a substation. The real-time monitoring and analyzing system comprises a data acquisition module, a data transmission module and a data processing module. The data acquisition module is mounted on an inspection vehicle and enabled to freely move for acquiring data of various devices in the substation. The data acquisition module transmits data to the data processing module through the data transmission module, and the data processing module performs real-time monitoring and intelligent analyzing to realize remote intelligent monitoring of power equipment. The real-time monitoring and analyzing system for the substation has the advantages that monitoring ranges and objects can be selected independently and flexibly, the defect of immovability of monitoring platforms mounted in fixed points is overcome effectively, monitoring ranges are widened, the problems of inaccuracy in temperature measurement of voltage heating equipment due to temperature errors resulted from remote monitoring are reduced, operation efficiency is improved, and manpower and material resources are saved. The invention further provides a real-time monitoring and analyzing method for the substation.

The present invention relates to an intelligent hot plate temperature controller and a control method thereof. The temperature controller is provided with a main control circuit; the input end of the main control circuit is connected with a hot plate temperature sensor through a temperature detection circuit, and the output end is connected with a hot plate heating device through a temperature control circuit; the main control circuit is also connected with a human-machine interface circuit; and a single chip is used as a control core of the main control circuit and is provided with an internal hot plate temperature control program. The control method comprises the following steps: initializing the configuration and parameters of the electrified system; reading the contents of the memory; modifying the target temperature and various parameters according to needs; acquiring the current actual temperature of the hot plate with the main control circuit through the temperature detection circuit; comparing the current actual temperature with the target temperature to obtain the temperature error; and performing the PID adjustment of the temperature error, so that the actual temperature is maintained at the target temperature. The present invention has the advantages of accurate and constant control, rapid response and consistent repeatability of the temperature when the machine is repeatedly started, and can accurately track the technical process, improve the yield rate, facilitate the debugging and save the time.

The invention belongs to the field of inertial device error compensation, and specifically relates to a temperature error compensation method during MEMS inertial measurement unit cold start. The temperature error compensation method comprises: (1) selecting a temperature error compensation model, collecting temperature compensation data, pre-treating the temperature compensation data, optimizing temperature compensation error model parameters, and carrying out temperature compensation. According to the present invention, the improved temperature error compensation model and the corresponding, simple and easy performing work process are provided based on the gyro and the accelerometer in the MEMS inertial devices; and when the MEMS inertial measurement unit being subjected to temperature compensation is subjected to cold start, the influence of the temperature increase and the external temperature change is low, such that the preparing time of the MEMS inertial measurement unit is substantially shortened, and the speedability of the MEMS inertial measurement unit as the navigation system is increased.

The present invention relates to a method of controlling air temperature within a refrigerated storage space based on a temperature-error integral of supply air discharged into the storage space. Another aspect of the invention relates to a refrigerated storage space comprising a corresponding temperature control system.

The invention discloses a method for improving bridge deflection testing precision based on an inclinometer. The method is mainly used for improving the bridge deflection testing precision by three aspects of temperature error compensation, improvement of signal-to-noise ratio through band-pass filtering, and improvement of a deflection calculation method based on a dip angle value. The method comprises the following steps of a, carrying out temperature calibration on a to-be-used inclinometer in a one-to-one manner, b, acquiring inclination angles corresponding to a plurality of designated positions on the bridge, c, carrying out temperature drift error correction on the obtained inclination angle values by adopting respective pre-calibrated inclinometer temperature error compensation formulas, d, adopting a band-pass filtering algorithm for preprocessing the dip angle values, and eliminating noise influence, and e, adopting an improved conformal spline function fitting method to calculate the bridge deflection. According to the method, on one hand, the inclinometer measuring point arrangement is free of any restriction, and on the other hand, the calculation precision of an original test method is greatly improved, and the dynamic deflection of the bridge can be monitored in real time.

The invention provides a Y-waveguide integrated optics phase modulator modulation factor measurement device and method. The device comprises a wide-spectrum light source, a circulator, a Y-waveguide integrated optics phase modulator, a polarization beam splitter, polarization-maintaining delay optical fibers, a Faraday optical rotation reflector, a signal generator, a photoelectric detector and an oscilloscope. The Y-waveguide integrated optics phase modulator modulation factor measurement device and method are of great significance in grasping the optical fiber current transformer transformation ratio temperature error production mechanism and inhibition method and improving temperature environmental suitability and long-term running stability of an optical fiber current transformer.

The invention relates to the field of sponge products, and specially, relates to a technology for producing sponge from a plant oil polyether. The technology comprises a raw material supply process section, a mixing process section and a foaming process section. The technology is characterized in that through extraction and synthesis, a plant oil polyether polyol is prepared from plant oil raw materials; raw materials adopted by the raw material supply process section comprise a polyol component and an isocyanate component; the polyol component comprises the plant oil polyether polyol, a chain extender, a foaming agent, a catalyst and a foam stabilizer; the isocyanate component comprises isocyanate; the raw materials are respectively input into a work storage tank; and a work storage tank temperature is controlled in a range of 20 to 25 DEG C by a temperature control system, wherein the temperature error is less than 1DEG C. The technology has the advantages that a plant oil polyether replaces a traditional petroleum polyether to be utilized for production of sponge (comprising common sponge and slow-rebound sponge), and thus waste sponge degradation is realized; environmental pollution is reduced; and environmental protection and sustainable development can be promoted.

The invention discloses a temperature measurement method, which comprises the following steps: S101, obtaining a first temperature value of at least one to-be-measured target in a view field area; S102, obtaining a distance value corresponding to the to-be-measured target in the view field area; and S103, according to the distance value obtained in the step S102, calculating the temperature errorthrough a pre-calibrated function relationship between the distance and the temperature error, and correcting the first temperature value by using the temperature error to obtain a second temperaturevalue, wherein the second temperature value is the temperature of the to-be-measured target. According to the invention, a depth camera and an infrared detector are used for collecting the same view field area, and the position of a to-be-detected target in a far-infrared image is determined according to the pixel points of the to-be-detected target in a depth image, further the temperature valueobtained in the far infrared image is corrected according to the distance value obtained in the depth image to obtain the accurate temperature value of the to-be-detected target, and the temperature measurement accuracy is improved through the synergistic effect of the depth camera and the infrared detector.