121results about How to "Facilitates temperature compensation" patented technology

Disclosed is a memory device including an error rate measurement circuit and a control circuit. The error rate measurement circuit, carrying a BIST circuit, reads out and writes data for an area for monitor bits every refresh period to detect an error rate (error count) with the refresh period. The control circuit performs control for elongating and shortening the refresh period so that a desired error rate will be achieved. The BIST circuit issues an internal command and an internal address and drives the DRAM from inside. The BIST circuit writes and reads out desired data, compares the monitor bits to expected values (error decision) and counts the errors.

The angular velocity sensor for detecting an angular velocity for detecting movement amounts and for controlling postures of vehicles, airplanes, cameras, and the like. The angular velocity sensor is provided with a piezoelectric vibrator, a temperature compensation function generating section, a correction coefficient setting section, an oscillation section, a synchronous pulse forming section, and a Coriolis output detection section. If an angular velocity is applied to the piezoelectric vibrator vibrating in a specific direction being driven by the oscillator section, a Coriolis force acts on the piezoelectric vibrator, and a vibration is generated which is perpendicular to the vibration in a specific direction. An electric charge generated by this vibration is detected at the detection electrode of the piezoelectric vibrator. The detected electric charge is converted to a voltage at the Coriolis output detection section, and a temperature compensation is performed, and further, the output is detected and a DC component is extracted. After that, a DC detecting signal having high stability without being influenced by factors such as the ambient temperature, power supply voltage fluctuations and unevenness in circuit devices is output from the Coriolis output detection section.

A physical quantity sensor apparatus includes a physical quantity sensor including a flexurally deformable diaphragm including a pressure receiving surface and a temperature sensor disposed on the pressure receiving surface side of the diaphragm to be spaced apart from the diaphragm. The pressure sensor includes a hollow section, which is a pressure reference chamber, on a surface side opposite to the pressure receiving surface of the diaphragm.

The present invention relates to a load and moment sensor for a prosthetic device detecting load in a single direction and moment in a single plane. The load and moment sensor includes a sensing element, and a plurality of strain gauges placed in specific locations of the sensing element. The plurality of strain gauges is part of a plurality of resistor circuits such as Wheatstone bridges. While the strain gauges can be located on a single sensing element, some resistive elements of the Wheatstone bridges can be located elsewhere on the prosthetic device. The combination of the location of the strain gauges and the use of the Wheatstone bridges allows for good side load rejection which is load and moment not in the single direction or the single plane.

The present invention provides a polycrystalline silicon conducting structure (e.g., a resistor) whose resistance value is controlled, and can be less variable and less dependent on temperature with respect to any resistant value, and a process of producing the same. Use is made of at least a two-layer structure including a first polycrystalline silicon layer of large crystal grain size and a second polycrystalline silicon layer of small crystal grain size, and the first polycrystalline silicon layer has a positive temperature dependence of resistance while the second polycrystalline silicon layer has a negative temperature dependence of resistance, or vice versa. Moreover, the polycrystalline silicon layer of large grain size can be formed by high dose ion implantation and annealing, or by depositing the layers by chemical vapor deposition at different temperatures so as to form large-grain and small-grain layers.

The invention provides an infrared gas sensor based on radial basis network temperature compensation and a detection method, that are, a gas concentration detection method based on radial basis function neural network temperature compensation and an infrared gas sensor based on radial basis temperature compensation. The infrared gas sensor can be made to eliminate a measurement error generated due to a detected environment temperature change, and compared with an existing empirical formula method, the temperature compensation process is easier, more convenient and wider in applicability due to the fact that a radial basis network has the advantages that the training speed is higher and structural self-adaption determination and output are irrelevant to an initial weight value; compared with an existing temperature control method, due to the fact that only a chip embedded with a radial basis function neural network algorithm needs to be additionally arranged, increasement of the size of the infrared gas sensor is avoided, and minimization and low cost of the sensor are better facilitated.

A fiber-optic current sensor uses a highly-birefringent spun fiber as sensing fiber. The light is fed through a retarder, which is a detuned quarter-wave or half-wave retarder. It is shown that such detuning can be used to compensate for temperature dependencies of the sensing head.

The invention provides a novel concrete strain gauge and relates to a stress strain measurement device in a civil structure. The novel concrete strain gauge comprises a shell, a temperature sensor, a strain force sensor and a cable. The shell is internally provided with the temperature sensor and the strain force sensor. The middle part of the shell is provided with the cable which is connected with the temperature sensor and the strain force sensor. According to the novel concrete strain gauge, the temperature sensor is added into a common concrete strain gauge, temperature compensation is facilitated, the accuracy and reliability of monitoring data are raised, and an engineering accident caused by the influence of environmental temperature factors is avoided.

The invention relates to an oil-filled temperature and pressure combined sensor, belonging to the technical field of temperature and pressure combined sensors. The oil-filled temperature and pressure combined sensor solves the problem that signals in a local area cannot be measured at the same time when a temperature and pressure combined sensor which is formed by two kinds of sensors in an assembling way. The oil-filled temperature and pressure combined sensor consists of a pipe seat, a pressure chip, a temperature chip, a gold wire lead, a silver-palladium wire, an external leading-out wireharness, a ceramic ring, a blocking plug, a corrugated diaphragm and a pressing ring. The pressure chip and the temperature chip are assembled in the pipe seat in a short distance and are welded on the pipe seat in a eutectic brazing way. When the oil-filled temperature and pressure combined sensor is used, after oil is filled in vacuum, the pressure chip and the temperature are protected at the same time and then pressure is sensed by the corrugated diaphragm. The oil-filled temperature and pressure combined sensor is suitable for the simultaneous measurement of the temperature and the pressure in the local area.

A laser scanner which operates pursuant to the elapsed time principle and which has a pulsed laser that directs successive light pulses into a monitored region. The laser scanner further has a light receiving arrangement for receiving light pulses reflected by an object in the monitored region and that generates electric received signals which are fed to an evaluation unit for determining a distance between the object and the laser scanner based on the elapsed time between the emission of the light pulse and the receipt of the reflected pulse and the speed of light from which a distance signal is formed that is representative of the distance between the object and the scanner. There is a light diverter unit between the pulsed laser and the monitored region which continuously directs light pulses along different directions into the monitored region. A light source is provided which emits a light measuring signal of reduced strength which is also continuously directed into the monitored region in continuously changing directions. The light receiving arrangement is configured to receive the light measuring signal reflected by the object in the monitored region and to generate a reflection signal that is representative of the reflection characteristics of the object. The light pulses and the receiving signals are changeable in dependency of the reflection signal.

The invention discloses a concrete strain meter having a temperature sensing function, and relates to the strain measuring device of stress in an earth/wood structure. The concrete strain meter comprises a housing, a temperature sensor, a strain force sensor, and a cable. The temperature sensor and the strain force sensor are disposed in the housing. The cable is disposed on the middle part of the housing, and is connected with the temperature sensor and the strain force sensor. According to the invention, the temperature sensor is additionally disposed in the common concrete strain meter, and therefore the temperature compensation can be facilitated, the accuracy and the reliability of the monitoring data can be improved, and the engineering accidents caused by the ambient temperature factor can be prevented.

The invention relates to a pressure transmitter for an overload-proof pressure gauge, comprising a base body, a separating membrane disposed on a pressure-sensitive side of the pressure transmitter and subjectable to a pressure to be measured, a communicating chamber located inside said base body, which receives a pressure transmission medium, said chamber being closed on the pressure-sensitive side by the separating membrane, wherein the coefficient of thermal expansion of the pressure transmission medium is established in such a way that a temperature-induced change in the volume of the communicating chamber equals a temperature-induced change in the volume of the pressure transmission medium.

The present invention is based on a chiral nematic liquid crystal composition which shows cholesteric liquid crystal phase and be able to reflect light in visible region selectively, comprising:

• • a nematic liquid crystal material;
  • a first chiral material with shift direction of selective reflection wavelength toward long wavelength direction depending on temperature;
  • and a second chiral material with shift direction of selective reflection wavelength toward short wavelength direction depending on temperature;
  • wherein at least one chiral material between the first chiral material and the second chiral material comprises two or more chiral compounds, and relates to a preparation method of the above chiral nematic liquid crystal composition and a (layered-type) liquid crystal display using the same.

The invention provides a strain gauge and relates to a stress strain measurement device in a civil structure. The strain gauge comprises a shell, a temperature sensor, a strain force sensor and a cable. The shell is internally provided with the temperature sensor and the strain force sensor. The middle part of the shell is provided with the cable which is connected with the temperature sensor and the strain force sensor. According to the strain gauge, the temperature sensor is added into a common concrete strain gauge, temperature compensation is facilitated, the accuracy and reliability of monitoring data are raised, and an engineering accident caused by the influence of environmental temperature factors is avoided.

The invention discloses an embedded type strain gauge, relating to the stress strain measurement device inside the construction structure. The embedded type strain gauge comprises a shell, a temperature sensor, a strain sensor, and a cable. A temperature sensor and a strain sensor are arranged inside the shell. The cable is arranged in the middle of the shell, and the cable is connected to the temperature sensor and the strain sensor. The embedded type strain gauge adds the temperature sensor in the common concrete strain gauge, which is convenient for the temperature compensation, improves the accuracy and reliability of the monitored data and prevents the engineering accidents caused by the environment factors.

The invention discloses a concrete crack meter having a temperature sensing function, and relates to a strain measuring device of stress in an earth/wood structure. The concrete strain meter comprises a housing, a temperature sensor, a strain force sensor, and a cable. The temperature sensor and the strain force sensor are disposed in the housing, and the cable is disposed on the middle part of the housing. The cable is connected with the temperature sensor and the strain force sensor. According to the invention, the temperature sensor is additionally disposed in the common concrete strain meter, and therefore the temperature compensation can be facilitated, the accuracy and the reliability of the monitoring data can be improved, and the engineering accidents caused by the ambient temperature factor can be prevented.

A temperature compensated piezoelectric oscillator includes: an oscillation circuit that drives a piezoelectric element with a current; a direct-current-stopping fixed capacitor; a frequency-temperature compensated circuit that compensates the deviation of an oscillation frequency caused by a change of temperature; and a piezoelectric transducer which includes a piezoelectric element driven in a prescribed frequency; where the above elements are connected serially.

An optical pressure sensor is disclosed having a pressure sensing optical cavity. A temperature sensing optical cavity at the sensor head is used by an interrogator to correct a pressure signal for effects of temperature. The optical cavities may be, for example, Fabry Perot cavities in the sensor head.

The invention discloses a methane sensor based on a single heating element, a preparation method and application. The methane sensor is suitable for industrial and mining enterprises and comprises a heating element, a measuring element, and an environment temperature measuring element, wherein a heater of the heating element of the methane sensor and a measuring component of the measuring element are suspended in air through supporting arms; the heating element independently heats to the high-temperature working state; the measuring element is independently used for detecting gas concentration; the temperature on a detecting sheet of the environment temperature measuring element detects is used for temperature compensation. The processing technology of the methane sensor is compatible with the CMOS (Complementary Metal Oxide Semiconductor) technology. The sensor has the advantages that the sensor is simple in structure, low in power dissipation, high in sensitivity, good in anti-jamming performance, and low in cost.

Provided is a method for manufacturing an acoustic wave device that has an excellent temperature coefficient of frequency (TCF) and high accuracy of IDT pattern forming and is capable of resisting high temperature processing of 200 degrees or more. The method for manufacturing an acoustic wave device according to the present invention includes forming an IDT (2) on a principal surface (1a) of a piezoelectric substrate (1), and forming a film by thermal spraying a material (3) having a smaller linear thermal expansion coefficient than the piezoelectric substrate onto an opposite principal surface (1b) of the piezoelectric substrate (1) where the IDT (2) is formed.

The invention provides a thermal flow sensor, comprising a power circuit, a field-effect tube, a Wheatstone bridge, an operational amplifier circuit and a microcontroller, wherein the drain of the field-effect tube is connected with the power circuit; the Wheatstone bridge comprises two bridge arms on which a heating resistor and a temperature sensitive resistor are respectively arranged, and the common point of the two bridge arms is connected with the source electrode of the field-effect tube and serves as a detecting voltage output point reflecting the current air mass flow; the operational amplifier circuit is respectively connected with the intermediate nodes of the two arms of the Wheatstone bridge, and the output end of the operational amplifier circuit is connected to the grid electrode of the field-effect tube to adjust the current flowing through the heating resistor by controlling the current flowing out from the source electrode of the field-effect tube and ensure that the surface temperature of the heating resistor remains stable; and the input end of the microcontroller is connected with the source electrode of the field-effect tube and used for processing the detecting voltage of the source electrode of the field-effect tube and outputting a frequency signal showing the current air mass flow. The thermal flow sensor has the advantages of high precision, and strong stability.