32results about How to "Improved Temperature Compensation Accuracy" patented technology

A temperature-compensated crystal oscillator includes a crystal resonator; and an oscillator circuit for performing temperature compensation. The oscillator circuit has a temperature sensor unit that measures an ambient temperature of the crystal resonator, a temperature compensation unit that outputs a first voltage for temperature compensation based on the measured temperature, a high-temperature load capacitance adjustment unit that outputs a second voltage for temperature compensation based on the temperature measured in a high temperature area exceeding a particular temperature range, an oscillator unit having first and second variable capacitance elements used for temperature compensation within a particular temperature range, third and fourth variable capacitance elements used for temperature compensation in the high temperature area, and an oscillation integrated circuit (IC) connected to the crystal resonator to perform an oscillation operation, and a buffer that amplifies the output from the oscillator unit.

Embodiments of the present invention provide a temperature compensation method and apparatus for a received signal strength indicator. The apparatus comprises a temperature sensor configured to measure a current temperature; and a digital compensation module configured to select a temperature compensation coefficient from prestored temperature compensation coefficients corresponding to a normal temperature, a low temperature and a high temperature according to the current temperature, and perform temperature compensation on output signals of the RSSI according to the selected temperature compensation coefficient. With the method and apparatus of the embodiments of the present invention, the accurate power values of the input signals of the RSSI under any temperatures can be obtained by measuring the characteristics of the RSSI under the predefined three temperatures, and using an interpolation method to compensate for the temperature characteristics of the RSSI. In comparison with the relevant art, the size of the storage is decreased and the accuracy of temperature compensation is improved.

The invention discloses a cement-based intelligent composite material strain sensor with a temperature compensation function, which comprises a strain monitoring module and a temperature monitoring module, wherein the strain monitoring module and the temperature monitoring module are formed by carbon-fiber cement-based intrinsic intelligent composite material and four parallel electrodes arranged on the composite material; and the strain monitoring module and the temperature monitoring module are connected and are respectively provided with four parallel electrodes. The cement-based intelligent composite material strain sensor has the advantages of temperature compensation function, high sensitivity coefficient, high voltage-sensitive and good performance stability, is applicable to strain monitoring of concrete structures under various environment conditions, avoids the defect of poor technical effect of a thermoelectric couple for directly measuring the temperature and carrying out temperature function, has the characteristics of high temperature compensation accuracy and simple technology and simultaneously improves the temperature compensation effect and the strain monitoring accuracy of the sensor under various strain conditions.

The invention relates to a temperature compensation device for a fiber grating strain sensor of reinforced fiber composite material, which comprises a base in which a fiber grating temperature compensation device is arranged: four layers of glass fiber cloth prepregs are respectively laid on the upper and lower ends of a foam core material, and Between the four layers of glass fiber cloth prepregs, between the foam core material and the glass fiber cloth prepregs, temperature compensating optical fibers are respectively embedded, and the three are integrated through the curing molding process. Lead out from one side, pass through the sleeve at the edge of the glass fiber cloth prepreg, and weld and connect with the jumper in the heat shrinkable sleeve. The jumper port is connected to the input port of the adapter, and the adapter passes through the mounting hole on the front side of the base. And it is connected to the base through fixing screws, thereby solving the problem of thermal strain differences at different lay-up positions of the composite material, which causes the center wavelength drift difference of the fiber grating temperature compensation sensor. The seal seals for an improved watertight seal.

The invention discloses an adaptive accelerometer temperature compensation method for inertial navigation, the method comprising: S1, testing multiple sets of accelerometer data output by inertial navigation within the full temperature range; S2, multiple sets of accelerometer data obtained in step S1 Accelerometer data is calculated and analyzed to obtain the output characteristics of multiple groups of accelerometers; S3, according to the output characteristics of the accelerometers in step S2, establish multiple groups of mathematical models; S4, according to the working state parameters of the inertial navigation system, from multiple groups of mathematical models Select the best mathematical model as the temperature compensation model of the current working state for temperature compensation. The advantage is that this method collects the output data of the accelerometer in the full temperature range multiple times, uses big data to analyze the characteristics of the accelerometer changing with temperature, and obtains a variety of segmented linear or curve fitting mathematical models. Different mathematical models match the data output characteristics under different working conditions, which improves the measurement accuracy of the accelerometer and the effectiveness of the temperature compensation method.

A circuit device includes an oscillation circuit configured to cause a resonator to oscillate, a clock signal output circuit configured to output a clock signal based on an oscillation signal from the oscillation circuit, a temperature compensation circuit configured to perform temperature compensation on an oscillation frequency of the oscillation signal, a low-potential-side power supply pad to which low-potential-side electric power is supplied, a high-potential-side power supply pad to which high-potential-side electric power is supplied, and an inter-power-supply capacitor provided between a low-potential-side power supply line electrically continuous with the low-potential-side power supply pad and a high-potential-side power supply line electrically continuous with the high-potential-side power supply pad. The inter-power-supply capacitor is formed of at least two metal layers provided in a region where the temperature compensation circuit is disposed in a plan view.

The invention relates to a wide-temperature-range high-precision sputtering film pressure sensor and a manufacturing method thereof. A sensitive element in the sensor comprises a transition layer, aninsulating layer and a circuit layer which are arranged at the end part of a pressure interface; the circuit layer is provided with a pressure measuring circuit and a temperature compensation circuit;an adapter base is fixedly arranged on the sensitive element; a plurality of electric connecting pieces are circumferentially and uniformly arranged on the adapter base; each electric connecting piece comprises an arc-shaped bonding pad and an inserting pin which are connected with each other; the arc-shaped bonding pads are horizontally arranged on the adapter base; the inserting pins are perpendicular to the adapter base, and the bottoms of the inserting pins are fixed through bumps; a leading-out signal of the sensitive element penetrates through the adapter base to be connected with the arc-shaped bonding pad; a protective plate is arranged above the bumps to cover the adapter base; the inserting pin penetrates through the protective plate to be welded with one end of a lead wire; andthe outer side of a whole after welding of the inserting pin and the lead wire is further subjected to contour welding reinforcement through a metal wire. The pressure sensor solves the technical problems that an existing pressure sensor is relatively narrow in using temperature range, inaccurate in pressure measurement and not suitable for application under severe conditions of strong vibration,large impact and the like.

The invention discloses a temperature compensation circuit and a temperature compensation method of a switch-type Hall sensor, comprising: a Hall sheet, a differential amplifier, a switched capacitor circuit, a voltage stabilizer, and a hysteresis comparator, between the voltage stabilizer and the switched capacitor circuit A reference current generation circuit and a threshold voltage generation circuit are connected in series, and the reference current and threshold voltage are generated and supplied to the hysteresis comparator. The hysteresis comparator compares the amplified Hall induced voltage with the threshold voltage, and outputs the discrimination result to the output stage. The invention adds a reference current generation circuit module, changes the threshold voltage generation method, has higher temperature compensation accuracy, and is not affected by the non-linearity of the resistance temperature coefficient, and can realize indiscriminate high-precision compensation at each temperature value , which reduces the requirements on the used process lines, does not require specific positive and negative temperature coefficient resistors, and relaxes the selection of process lines for design engineers.