158results about How to "To achieve temperature compensation" patented technology

The invention discloses a pressure sensor calibration method with a temperature compensation function. According to the method, a zero drifting value and a sensitivity drifting value of a pressure sensor are measured at normal temperature and other temperature points, different pressures at the normal temperature and AD values corresponding to the pressures are stored in a pressure parameter table of the pressure sensor, then a zero drifting value and a sensitivity drifting value of the pressure sensor in a full-temperature range are obtained through a curve fitting method when the pressure sensor works, through calculation, the pressure AD values of the sensor at any temperature are converted into AD values at normal temperature, and finally compensated pressure measuring values are obtained according to the parameter table. According to the method, important parameters, namely the zero drifting values and the sensitivity drifting values of the pressure sensor are directly used, and the calibrated pressure sensor is high in precision and is easy to operate.

The invented optical-fibre grating vibration sensor is characterized by that it utilizes a demodutation grating and a sensing grating and makes them be series-connected together, and respectively makes them be stuck on a main beam and an auxiliary beam, two beams are made of identical material and have identical heat expansion coefficient, so that their central wavelengths can be synchronously shifted with temperature, therefore they have automatic temperature compensation function so as to implement matching filter demodutation. Said invention utilizes the detection of light intensity change of sensing grating reflecting light to monitor the parameters of vibration frequency and vibration amplitude of monitored body, finally utilizes computer or single-chip computer to make analysis and processing of body vibration frequency spectrum.

The invention belongs to an optical fiber grating earth pressure sensing method. The method is characterized in that: a bearing disc (1) is connected with a cylindrical cavity shell (6), the cylindrical cavity shell (6) is connected with a disc cover (11); the bottom end of the cylindrical cavity shell (6) is provided with two wedge-shaped blind holes (12), and two fixed legs (5) are wedged into the two wedge-shaped blind holes (12); the fixed legs (5) are provided with fixed splints (13) and buffer splints (14) respectively, the fixed splints (13) are fixed at the two ends of a force measurement grating (9), the buffer splints (14) are fixed at the two ends of a temperature compensation grating (8), after the force measurement grating (9) and the temperature compensation grating (8) are connected in series, the two ends of the connected force measurement grating (9) and the temperature compensation grating (8) are connected with an input/output optical fiber (7) by a grating port (10), wavelength values of the force measurement grating (9) and the temperature compensation grating (8) are measured by an optical fiber grating demodulator, and then a true value of the earth pressure is obtained by subtracting the wavelength value of the temperature compensation grating (8) from the wavelength value of the force measurement grating (9). The method has the advantages of high sensitivity, anti-electromagnetic interference, good stability and being capable of monitoring landslide mass deformation, subgrade settlement, tunnel roof deformation and bridge deformation for a long time.

The invention discloses a two-channel optical fiber method and two-channel optical fiber sensor for measuring turbidity. The method is characterized in that a detection mode adopting double light sources, four laser beams and four photo-electricity is adopted, and the double different-wavelength light sources can be alternately lightened by an optical measuring module, so that 90-degree scattered lights and transmission lights can be alternately measured; a temperature measuring module is used for collecting temperature signals of water; a signal adjusting module is used for processing collected turbidity signals and temperature signals; a data processing module is used for calculation and treatment so that turbidity values and a temperature values are generated, and the in-site collecting data are transmitted to an upper computer. The different-wavelength light sources are simultaneously measured so that the stray light impact on turbidity measurement is eliminated; the external impact on the light signals is avoided through optical fiber transmission, thus the method has the high-temperature and high-pressure resisting performances and the anti-electromagnetic interference performance; temperature compensation is performed on the measured turbidity values so as to improve the measurement precision of turbidity. In-site online detection for the turbidity values is realized by the method, thus the method is high in sensitivity, excellent in linearity, low in cost and easy to carry and install, and the method is applied to narrow detection space and occasions where detected liquid is limited in capacity.

The invention discloses a temperature compensation circuit and method applied to a display panel and the display panel. The display panel includes a control circuit, a driving circuit, a detection circuit, and a pixel circuit. The detection circuit is used for obtaining a current threshold voltage of a switch tube in a pixel circuit. The control circuit obtains a current voltage difference betweenthe current threshold voltage and initial threshold voltage, a current compensation gain matched the current voltage difference is obtained in preset associated data of a voltage difference and a compensation gain, and the current compensation gain is used to control the driving circuit to drive the pixel circuit. Through the above mode, the temperature compensation of the display panel can be realized without an additional temperature sensor, and thus the service life of the display panel is prolonged.

The invention discloses a small-signal sectional fitting temperature compensation method of a water quality sensor, relates to the technical field of small signal processing, and in particular relates to a sectional fitting method which can realize a fitting effect for improving the measure accuracy, reducing the measure data conversion error and fitting a nonlinear curve to improve the measure precision. The method comprises the following steps of establishing a mathematic model by adopting a sectional linear fitting method, dividing a pH temperature coefficient KpH calibration curve into a plurality of intervals, fitting a corresponding linear equation by adopting a least square method, calculating the linear fitting precision, re-dividing the intervals to perform the fitting if the precision is lower than a threshold value until the precision meets the requirement, and further realizing the temperature compensation. A simple, rapid and precise mathematic model is adopted, so that the data acquisition accuracy can be effectively improved.

The invention discloses a hybrid-range FBG (fiber bragg grating) strain and crack sensor for a concrete material package. The sensor comprises a pre-cast concrete material package structure, a spring FBG firmly combined with a micro spring, a pure FBG, a temperature sensor, two penetration grooves, a temperature sensing area and an armored optical cable. Firstly, the pure FBG and the spring FBG firmly combined with the micro spring are embedded in the two penetration grooves, then, one segment of two groups of the FBG is firmly combined with a die through a high-performance adhesive, a tension pre-stress is applied on the two groups of the FBG, and then, the other end of each one of the two groups of the FBG is firmly combined, the temperature sensor is embedded in the package structure, and finally, the armored optical cable is used for connecting the two groups of the led out FBG and the temperature sensor. The hybrid-range FBG strain and crack sensor is suitable for structural health monitoring in various concrete structures of civil engineering, is simple in technology, convenient to arrange, high in accuracy and wide in range, and can monitor internal strain and cracks in overall process of destroying the concrete structure by pulling and pressing.

The invention relates a fiber bragg grating high-temperature stress testing device applied to a structural heat test radiation heat environment and a mounting method of the fiber bragg grating high-temperature stress testing device. The device comprises a stress sensing optical fiber (3) which is equipped with a fiber bragg grating (5), two 8-shaped quartz tubes (2) and a temperature reference optical fiber (4), wherein the temperature reference optical fiber (4) is the same as the stress sensing optical fiber (3); the stress sensing optical fiber (3) and the temperature reference optical fiber (4) respectively pass through the two 8-shaped quartz tubes (2) to be parallel; the stress sensing optical fiber (3) is integrally fixed to the two 8-shaped quartz tubes (2) through fixing materials (6); the temperature reference optical fiber (4) is only integrally fixed to one 8-shaped quartz tube (2), and the other end of the temperature reference optical fiber (4) is suspended. With the adoption of the device, the temperature of degeneration of the fiber bragg grating at high temperature is solved; the device is applicable to the heat test environment at the temperature close to 1000 DEG C and achieves the high-temperature stress measurement of a composite material structural part.

The invention provides a three-dimensional touch panel. The three-dimensional touch panel comprises an insulation dielectric layer, a touch electrode layer and a pressure-sensitive electrode layer, wherein the touch electrode layer and the pressure-sensitive electrode layer are respectively positioned at two opposite sides of the insulation dielectric layer; the touch electrode layer comprises multiple sets of insulated and staggered touch electrodes and is used for detecting the position of a touch signal; the pressure-sensitive electrode layer comprises at least one pressure-sensitive electrode correspondingly arranged with at least one part of the touch electrodes and is used for detecting the pressure of the touch signal; the touch electrode correspondingly arranged with the pressure-sensitive electrode is also used for performing temperature compensation of the pressure-sensitive electrode; and the temperature compensation manner includes a positive and negative temperature coefficient material series manner, a value reduction manner and a Wheatstone bridge manner. The three-dimensional touch panel provided by the invention has the advantages of being high in detection precision, light, thin and the like.

A readout circuit for an uncooled infrared focal plane array includes: a first biasing circuit for generating a detection output signal; a second biasing circuit for generating a first reference output signal; a first integration circuit; and an analog-to-digital circuit including: a ramp signal generating circuit for generating a ramp signal according to a second reference microbolometer of a third biasing circuit. In the readout circuit, subtracting and amplifying the detection output signal and the first reference output signal are provided by the integrator at an analog domain, while ratio counting is provided by an analog-to-digital converter during analog-to-digital conversion. Furthermore, a column level integrated readout channel utilizes only one reference microbolometer, and the chip level ramp signal generator also utilizes only one reference microbolometer. Therefore, a chip area is further saved, and noise sources are decreased.

The invention discloses a magnetic sensitivity temperature compensation circuit and a programmable linear Hall sensor chip. The magnetic sensitivity temperature compensation circuit comprises a Hall sheet and a differential amplifier, the Hall sheet senses a magnetic field signal, converts the magnetic field signal into a Hall voltage signal and outputs the Hall voltage signal to an input end of the differential amplifier, the magnetic sensitivity temperature compensation circuit further comprises a chopped wave offset cancellation circuit and an amplifier connected to output ends OUT1 and OUT2 of the differential amplifier, the amplifier is connected onto a signal output end of the chopped wave offset cancellation circuit, the Hall voltage signal amplified by the amplifier is outputted through an output port OUT on a buffer output stage, the differential amplifier is a gain adjustable differential amplifier, a tail current source Ibias of the differential amplifier is in direct proportion to the absolute temperature, and load resistors R1 and R2 on the differential amplifier both use load resistors in the same shape and material with the Hall sheet. Through the principle, the sensitivity of the Hall sheet is subjected to temperature compensation, so that the sensitivity of the chip is guaranteed not to change with the temperature.

The invention discloses a temperature control system with an environment temperature compensating function. According to change of an environment temperature, the system actively changes a temperature of a reaction disc, and compensates influence of the environment temperature to a reaction solution temperature. The system comprises a reaction disc temperature detection circuit used for detecting a reaction disc temperature. The reaction disc temperature detection circuit connects with a one-chip microcomputer through a first A/D conversion module. The one-chip microcomputer connects with a drive circuit. The drive circuit connects with a heating plate. The heating plate is provided around the reaction disc. The reaction disc is embedded with a reaction cup and heats reaction solution in the reaction cup. The system also comprises an environment temperature detection circuit used for detecting the environment temperature. The environment temperature detection circuit connects with the one-chip microcomputer through a second A/D conversion module. According to the temperature control system of the present invention, requirements of high precision, fast response and good stability of temperature by a biochemistry analyzer are satisfied, and environmental adaptability of a device is improved.

The invention discloses a power equipment and transmission line malfunction comprehensive online monitoring system which comprises a wireless temperature measuring terminal, a line malfunction detector, a transfer station, an information receiving main station, a database server and a monitoring host. The wireless temperature measuring terminal is wirelessly connected with the information receiving main station through a built-in wireless communication module, the line malfunction detector is wirelessly connected with the information receiving main station through a built-in wireless communication module and the transfer station, and the information receiving main station is connected with the database server which is connected with the monitoring host. The system can monitor and upload power equipment temperature rise standard exceeding and transmission line ground fault information in real time, quickly locate line fault sections and fault branches, shorten fault clearing time and improve safety and reliability of power equipment and transmission lines.

The invention provides a pressure sensing apparatus including a pressure sensing layer which further includes a plurality of pressure sensing units. Each pressure sensing unit comprises at least one kind of positive temperature coefficient materials and at least one kind of negative temperature coefficient materials. The pressure sensing unit detects resistance variation generated after the pressure sensing layer is pressed. The negative temperature coefficient materials are used for compensating for changes of resistance values due to temperatures after the positive temperature coefficient materials are pressed so as to making the pressure sensing apparatus to be insensitive to the temperatures.

The invention discloses a sensor orthogonal calibration method for oil drilling measurement. The method comprises the following steps of: selecting an acceleration sensor and a flux gate which conform to use requirements, arranging the acceleration sensor and the flux gate on an instrument framework, and simply regulating to enable the coordinate axes of an instrument coordinate system to be basically coaxial with the sensing shaft of the sensor; then arranging instruments into 12 specific gestures according to an established mathematical model, so as to obtain orthogonal calibration coefficients of the sensor; calculating one group of orthogonal calibration coefficients at an temperature interval under a heating state till the specific temperature; carrying out temperature compensation on orthogonal calibration coefficients by utilizing nonlinear fitting; and enabling the calibrated sensing shaft of the sensor to be accurately coaxial with the coordinate axes of the instrument coordinate system by virtue of software. By utilizing the method, the calibrated sensing shaft of the sensor is accurately coaxial with the coordinate axes of the instrument coordinate system by virtue of software, thermal compensation is realized, and the original instrument calibration method is improved.

The invention relates to a self-switching voltage stabilizing circuit of a power supply. The self-switching voltage stabilizing circuit comprises a voltage stabilizing unit part and a power supply switching unit, wherein an external power supply voltage input end is connected with the voltage stabilizing unit part, the voltage stabilizing unit part is connected with a power supply voltage output end through the power supply switching unit part, and the power supply switching unit part is also connected with a backup power supply positive input end. The self-switching voltage stabilizing circuit has advantage of being designed by adopting split elements and devices, so that the design is relatively flexible, an appropriate MOSFET (metal oxide semiconductor field effect transistor) is selected, a voltage stabilizing circuit with high input voltage can be designed, for example a voltage stabilizing circuit with the input voltage of 8V to 60V can be designed; meanwhile, the MOSFET is relatively high in efficiency, and the voltage stabilizing circuit with relatively large output current under the same size can be designed.

The invention provides a resistance-type strain sensor and a strain measurement method. The strain sensor can automatically perform temperature compensation during a strain measurement process, and meanwhile improves the sensitivity of strain measurement. The strain sensor comprises strain resistors and a substrate; the strain resistors are fixed on the substrate. The strain sensor is characterized in that the substrate is made from insulating material and is of a curved structure, the substrate at least comprises two rows arranged in parallel, and the end parts are separately connected with apasting end; one ends of the strain resistors on the two-row substrate are connected in series to achieve temperature compensation during a strain measurement process; the axle wires of the strain resistors on the two-row substrate are positioned at different positions of the substrate, to achieve the differences between the resistance variations during the strain measurement process. When in strain measurement, a lead is lead out from each of the two electrical ends of the strain resistors connected in series and the serially connected part in the resistance-type strain sensor to a half bridge measurement circuit and calibrated, and the measurement half bridge outputs voltage to acquire the strain of the substance under test.

The invention discloses a mine-used large-range fiber grating passive roof bed separation sensor, which comprises a shell, a wire rope roller mechanism and a fiber grating strain mechanism, and is characterized in that the fiber grating strain mechanism comprises a second gear, a precision screw rod with one end fixed with the second gear and rotating along with the second gear, a bevel slider with a bevel surface, a strain gauge fixing square block, and a fiber grating strain gauge, wherein the bevel slider sleeves the precision screw rod and can axially move along the screw rod; the strain gauge fixing square block is fixed on a front bearing support frame, and the position of the strain gauge fixing square block is corresponding to that of the bevel slider; and one end of the fiber grating strain gauge is fixed by the strain gauge fixing square block and the other end is a free end contacted with the bevel surface of the bevel slider and capable of sliding relatively, and a fiber grating is attached to the fiber grating strain gauge. The circular motion of the roller pulled by the wire rope changes to the axial motion of the bevel slider on the precision rod, the wavelength of the fiber grating changes, and real-time online dynamic roof bed separation monitoring can be realized.

The invention discloses a novel optical pulse-taking instrument system which comprises a voltage-stabilized source, a broadband light source, a drive circuit of the broadband light source, an optical fiber coupler, optical fiber measuring heads, a pneumatic pressure control device, transmission optical fibers, a spectrum demodulator, a data acquisition card, a microprocessor, control signals and a display output unit. Output light signals of the broadband light source are coupled through the optical fiber coupler to the transmission optical fibers; after passing through the measuring heads, the light signals are received through the spectrum demodulator, and received wavelength shift signals are acquired through the data acquisition card and transmitted to the microprocessor; the microprocessor drives a pneumatic control circuit to exert different action forces to the three measuring heads through the output control signals, and the mode of three-finger pulse taking operation in traditional Chinese medicine is simulated; meanwhile, a series of acquired wavelength shift signals are amplified, filtered and separated through the microprocessor, sent to the display output unit and the signals are used for output of pulse wave signals. The novel optical pulse-taking instrument system has the advantages of being simple in structure, high in sensitivity and free of electromagnetic interference, a measuring device is good in sealing performance, and temperature compensation can be achieved.

The invention, which relates to the technical field of strain sensors, provides an AlN-piezoelectric-film-based wireless passive surface acoustic wave high-temperature strain sensor. A single-ended pair resonator based on a multi-layer composite structure is employed and calculation is performed based on the frequency difference of a high-temperature strain sensing chip and a temperature compensation chip, so that the temperature-induced interference is eliminated, the temperature compensation is realized, and the wireless passive measurement in a high temperature environment is realized. Thesensor comprises a high-temperature strain sensing chip, a temperature compensation chip and a sensor tube base; the high-temperature strain sensing chip and the temperature compensation chip are arranged on the sensor tube base; the SAW propagation direction of the high-temperature strain sensing chip is parallel to the length direction of the sensor tube base; and the SAW propagation direction of the temperature compensation chip is perpendicular to the SAW propagation direction of the high-temperature strain sensing chip. The AlN-piezoelectric-film-based wireless passive surface acoustic wave high-temperature strain sensor is suitable for the application process of the high-temperature environment strain sensor.