765results about How to "Improve temperature measurement accuracy" patented technology

The invention is a method of measuring oxygen concentration in a package having an oxygen sensitive product disposed therein. The method includes exposing a luminescent compound that is disposed in an interior of the package to light having a wavelength that is absorbed by the luminescent compound so that the luminescent compound is promoted into an excited state. When the exposure of the light is terminated, the excited luminescent compound emits light that is detectable by a detector positioned outside of the package. The intensity of the emitted light is inversely proportional to the oxygen concentration and is used in conjunction with mathematical function that describes the luminescent intensity of the luminescent compound as a function of oxygen concentration and temperature to calculate the oxygen concentration. The method may be used to verify and track the oxygen concentration of a package as it moves through a distribution system.

The invention discloses an infrared radiation precise temperature measuring method. The infrared radiation precise temperature measuring method comprises the following steps that: Step 1: ambient reflection temperature Tu is measured; step 2: ambient atmospheric temperature T alpha is measured through using a thermometer, and atmospheric transmittance tau alpha is calculated according to the distance between a measured object and infrared radiation temperature measuring equipment; step 3: the radiation temperature Tr of the measured object is measured through using the infrared radiation temperature measuring equipment; step 4: the emissivity epsilon n and the reflectivity Rho n of the measured object as well as the sum alpha of the emissivity and the reflectivity are determined, wherein the alpha <= 1; step 5: measurement values of T alpha, Tu and Tr are input to the infrared radiation temperature measuring equipment, such that the value I (T alpha) of an ambient atmospheric temperature signal, the value I (Tu) of an ambient reflection temperature signal and the value I (Tr) of a radiation temperature signal of the measured object are calculated, and the values are substituted into an actual object infrared temperature measuring formula which is mentioned in the description, such that the value I (T0) of the infrared radiation temperature measuring signal is calculated; and step 6: according to the calibration formula of a thermal infrared imager, conversion calculation is performed so as to obtain the authentic temperature T0 from the value I (T0) of the infrared radiation temperature measuring signal.

The invention belongs to the technical field of photoelectric detection and discloses a radiometric calibration method for low-temperature measurement of a thermal infrared imager, which is capable of extending a low temperature measurement range of the current thermal infrared imager to 100 DEG C below zero and also increasing temperature measurement precision to be within 1 DEG C. In order to increase precision of low-temperature radiometric calibration, the method is characterized that radiometric calibration data are collected in a vacuum and low temperature environment. The method comprises the steps of: heating a radiometric calibration plate (1) through a thin film heating plate in the vacuum and low-temperature environment, leading the radiometric calibration plate (1) to reach a calibration temperature and to enter thermal equilibrium, collecting 14-bit original grays of all radiometric calibration regions at calibration temperatures in a range from 100 DEG C below zero to 0 DEG C by the thermal infrared imager; processing radiometric calibration data, obtaining radiometric calibration gray through statistics; and finally, fitting an inversion function of infrared thermal imaging temperature according to the radiometric calibration gray and temperature. The method disclosed by the invention has the advantages that low temperature measurement range of the thermal infrared imager is extended effectively and temperature measurement precision of low-temperature targets is improved through reduction of radiometric calibration error.

This invention discloses one infrared detector structure and process method based on micro mechanic bridge resonance device, wherein the detector is composed of bridge resonance chip and cover board through vacuum sealing technique or gas sealing technique; the incidence infrared line is to micro mechanic bridge surface through infrared incidence window to lead the bridge temperature rise and to add axis stress force and to lower resonance frequency to reflect incidence infrared strength.

The invention relates to infrared radiation measurement and calibration technology field and especially relates to a high-precision surface source blackbody radiation source device capable of being applied under a vacuum low temperature condition. The device mainly comprises a blackbody radiation source main body module, a vacuum cabin, a control cable in the cabin, a through-wall air plug, a control cable outside the cabin, a refrigeration copper braid and a controller module. The blackbody radiation source main body module is placed in the vacuum cabin. The blackbody radiation source main body module is connected to an inner wall of the vacuum cabin through the refrigeration copper braid. The blackbody radiation source main body module is connected to the controller module successively through the control cable in the cabin, the through-wall air plug and the control cable outside the cabin. The device has advantages that a problem that effective emissivity, temperature uniformity and a wide temperature range can not be simultaneously satisfied in the prior art is effectively solved; and an application basis is provided for calibrating and testing infrared detection equipment and establishing a low temperature target performance test system under a vacuum environment.

The invention belongs to the fields of mine fire prevention and explosion prevention and fire pre-warning safety monitoring, and relates to a high-precision optical fiber composite cable intelligent monitoring platform which is the key for protecting safety operation of optical fiber composite cables. The platform comprises a distributed optical fiber temperature measuring system, a cable heating temperature control system, an optical fiber measured temperature calibration system, a local discharge online monitoring system, a data exchange system and an upper computer. The intelligent monitoring platform integrates the distributed optical fiber temperature measuring system, the cable heating temperature control system, the optical fiber measured temperature calibration system, the local discharge online monitoring system and the data exchange system, overcomes defects in the prior art, gives full play of the advantages that the safety and reliability are good, temperature measuring and positioning precision is high, the anti-electromagnetic-interference capacity is high and the operation temperature and local discharge of the optical fiber composite cables are continuously monitored in real time on a large scale, gives full play of the transmission capacity of the optical fiber composite cables, reduces the operation cost, and achieves the diversified goals of engineering security application and experiment simulation and precise prediction.

The invention provides a method for simultaneously measuring the laser absorptivity and thermal conductivity of a single micro-nano wire rod, belonging to the technical field of characterization of property of nano-materials. The method disclosed herein is characterized by using contactless laser Raman measurement technology to position and carry out temperature calibration on the single micro-nano wire rod; then respectively using laser heating and electric heating methods in a vacuum environment to reach equal core temperature of samples to be measured and measure respective heating power; substituting the geometry size, core temperature and heating power of the micro-nano wire rod in a theoretical formula to simultaneously calculate the laser absorptivity and thermal conductivity of the samples to be measured. According to the invention, the method has the advantages of wide range of application, simple principle and convenient operation, is suitable for various micro-nano wire rods which have characteristic Raman spectrum and have different materials, diameters and lengths, fills the technical gap of measuring the laser absorptivity of the single micro-nano wire rod, and provides valuable basic physical property data for practical engineering application.

The invention relates to a device for measuring normal spectral emissivity of a non-transparent material. The key points of the technical scheme are as follows: a cylindrical cavity is internally provided with a graphite heating body; the graphite heating body is communicated with a water cooled electrode that is communicated with a direct current power supply; the top of the cylindrical cavity is provided with a hemispherical water cooled flange; observation holes are uniformly distributed on the hemispherical water cooled flange corresponding to a groove on the top of the graphite heating body; a detector, a chopper, and a reflector are respectively arranged outside the observation holes at two sides; the detector and the chopper are respectively connected with a microprocessor control system through lead wires; the microprocessor control system is connected with an artificial intelligent regulator through a lead wire; the artificial intelligent regulator is connected with the direct current power supply through a lead wire; a spherical reflector is arranged outside the middle observation hole on the hemispherical water cooled flange; a Fourier infrared spectrometer and a computer are installed together with the spherical reflector; and the hemispherical water cooled flange is provided with an evacuating device. The device disclosed by the invention has high heating speed, high vacuum degree, and high measurement precision.

The present invention discloses an ultra-long-range distributed fiber Raman photon temperature sensor of an integrated Raman amplifier, and comprises a distributed fiber Raman photon temperature sensor, a distributed fiber Raman amplifier and a fiber grating narrowband reflecting filter. The distributed fiber Raman amplifier is adopted to be embedded into the distributed fiber Raman photon temperature sensor; the gain of the amplifier is used to overcome fiber loss, strengthen the intensity of spontaneous Raman scattering light in the fiber, improve signal-to-noise ratio of the distributed fiber Raman photon temperature sensor system, augment the transmission distance of the distributed fiber Raman photon temperature sensor and improve temperature-measuring precision. With the fiber stimulated Raman scattering effect, the fiber spontaneous Raman scattering effect and the optical time domain reflection principle, the invention skillfully merges the technologies of the distributed fiber Raman amplifier and the distributed fiber Raman photon temperature sensor and achieves the ultra-long-range distributed fiber Raman temperature sensor.

The invention discloses an anti-overflow control method of a soybean milk machine. The soybean milk machine comprises a cup body, a motor, a heating device and a temperature sensor, wherein the motor is used for grinding and mixing materials in the cup body, the heating device is used for heating seriflux in the cup body, and the temperature sensor is used for detecting the temperature of the seriflux in the cup body; the temperature sensor, the heating device and the motor are respectively and electrically connected with a main control chip, the overflow temperature of the seriflux in the cup body is T, and the working state and real-time working efficiency of the motor and the heating device are regulated when the temperature and the overflow temperature T are detected by the temperature sensor; when the main control chip detects that the temperature of the seriflux reaches the overflow temperature, the main control chip controls the heating device to stop heating and controls the motor to stir the seriflux. The problem that the laitance is generated by the seriflux can be solved by carefully controlling the heating device and the motor, so as to cancel an anti-overflow device.

The invention discloses a self-correction method capable of eliminating wavelength dispersion of a distributed Raman temperature measurement system and belongs to the technical field of optical fiber temperature detection. According to the method, the distributed fiber Raman temperature measurement system serves as a base, the speed of Stokes light and the speed of the anti-Stokes light are calculated respectively to calculate optical fiber distances corresponding to two channels of signals, then a Stokes light path data point serves as a reference, a data point which is minimum in error and corresponds to the Stokes light path data point in the one-to-one relationship is selected through query and comparison in anti-Stokes light path data, a ratio curve is corrected, and real temperature information can be obtained. By the aid of the method, the influence of chromatic dispersion on the temperature precision is eliminated, correction and compensation are conducted for all measurement points of an optical fiber, besides, only sampling data in the aspect of algorithms are required to be searched to find the optimal matching point to conduct comparison, the hardware system is not required to be corrected, and the method is convenient, simple and capable of greatly improving the temperature measurement precision.

The invention relates to a method for improving the calibration precision of an infrared sensor. When the infrared sensor is calibrated, firstly, a blackbody origin with the same or similar emission coefficient with/to that of an object to be tested is selected, then, environment temperature intervals at several levels are divided according to the environment temperature range when the infrared sensor works, the work environment temperature of the infrared sensor is set through an environment temperature box or an air conditioner system, the infrared sensor is calibrated under the set environment temperature condition, the on-line test system or an instrument is adopted for recording the voltage or the current value output by the infrared sensor, a data sheet of the current or the voltage output by the infrared sensor corresponding to the standard blackbody temperature at the environment temperature at each level is obtained, the data is subjected to regression analysis, the output characteristic regression equation and curve of the infrared sensor are manufactured, the output characteristic is substituted into a test system, the calibration error is checked in the calibration state, and when the error exceeds the precision requirement, the calibration is carried out again. The method has the advantages that the error can be reduced, the calibration precision is improved, and the influence of the work environment temperature is avoided.

The invention discloses a sputtering thin film temperature-pressure composite sensor and a manufacturing method thereof, which can measure temperature and pressure of a high-low-temperature gaseous or liquid medium. The sputtering thin film temperature-pressure composite sensor comprises a joint, a sensitive element, copper columns, a compensating plate, gold lead wires, sleeves, a signal processing circuit board, an outer shell, lead wires, fastening screws, an aviation socket and a socket base, wherein four thin-film resistors used for measuring pressure are processed on the sensitive element by adopting a sputtering thin film technology, and two thin-film resistors used for measuring temperature are further processed in a tiny deformation region on the periphery of the pressure-measuring thin-film resistors; the four pressure-measuring thin-film resistors are connected with the compensating plate in a switch-over manner and are bridged by means of the gold lead wires, the two temperature-measuring thin-film resistors lead out four of the gold lead wires to be switched into lead wires by means of the compensating plate and connected to the signal processing circuit board, and bridge forming and compensation are completed on the signal processing circuit board. The sputtering thin film temperature-pressure composite sensor is based on the original sputtering thin film temperature-pressure composite sensor manufacturing process, and hardly increases any production and application cost.

The invention discloses a distributed optical fiber temperature sensor which mainly comprises a machine casing and a pulse laser source, a wavelength division multiplexer and an optical switch which are arranged in the machine casing. The optical switch is further connected with an optical fiber box, a reference optical fiber ring is arranged in the optical fiber box, a temperature probe is further arranged on the optical fiber box, and the tail end of the optical fiber ring is connected with an external sensing optical fiber through an optical terminal arranged on the machine casing. The wavelength division multiplexer is further sequentially connected with a photoelectric detection module, a high speed collection card and an industrial personal computer board card. The sensor is low in cost, simple in structure, good in signal to noise ratio, good in stability, reliable and high in temperature resolution. A method for removing a nonlinear error of the distributed optical fiber temperature sensor by utilizing a subsection loss difference compensation method to remove the nonlinear error caused by Raman Stokes and anti-Strokes optical loss difference is further provided. By means of the method, a temperature curve demodulated by the system accords with the actual condition, and temperature measuring accuracy and reliability of the system are improved.

The invention relates to the field of temperature measuring, and discloses an intelligent body temperature monitoring and alarming method and an intelligent body temperature monitoring and alarming system. The intelligent body temperature monitoring and alarming system comprises a temperature measuring terminal, a relay alarm terminal and a user terminal, wherein the temperature measuring terminal is used for acquiring the temperature data of the human body, and sending the temperature data of the human body to the relay alarm terminal; the relay alarm terminal is used for comparing the temperature data with temperature thresholds, when the temperature data is greater than a high temperature threshold or the temperature data is less than a low temperature threshold, carrying out temperature alarm, and sending the temperature data of the human body to a cloud database by a router; and the user terminal is used for invoking or receiving the temperature data of the human body in the cloud database by the router, comparing the temperature data with temperature thresholds, when the temperature data is greater than a high temperature threshold or the temperature data is less than a low temperature threshold, carrying out temperature alarm. According to the invention, the temperature data of the human body can be displayed, stored and judged, and when the temperature is greater than the temperature thresholds, double alarm is performed by the relay alarm terminal and the user terminal.

The invention discloses a device and method for testing bearing precision performance and a method for determining a bearing precision initial failure part. The device comprises a main shaft and a servo motor which are mounted on two machine frames respectively, wherein a main shaft shell is sleeved outside the main shaft, the main shaft is fixed on one machine frame through the main shaft shell, the rear end of the main shaft is fixedly connected with an output shaft of the servo motor, radial through holes for an acceleration sensor and a temperature sensor to be mounted in are formed in a face, matched with a tested bearing, of the main shaft shell, and a part, stretching out of the main shaft shell, of the front end of the main shaft is provided with a displacement sensor used for measuring the radial jump of the front end of the main shaft. The main shaft and the servo motor are mounted on the two machine frames respectively, the influence of vibration of the servo motor on the main shaft is reduced, a pair of precise angular contact ball bearings is arranged at the rear end of the main shaft for supporting, and the rotating precision and rigidity of the main shaft are improved. A constant-pressure pre-tightening device is mounted, the types and the number of springs can be changed according to requirements of a test, so that constant-pressure pre-tightening of the tested bearing is achieved.

The invention discloses a temperature measuring method based on the dual frequency magnetic field nanometer magnetization intensity, which belongs to the technical field of nanometer measurement, wherein a magnetic nanometer sample is placed on an object to be measured; dual frequency stimulation magnetic field is applied to the area wherein the magnetic nanometer sample is placed; magnetization strength signals of the magnetic nanometer sample stimulated by the dual frequency stimulation magnetic field are collected; every harmonic wave amplitude value is extracted from the signals; and finally, an equation set is established according to the relationship of the harmonic wave and the temperature. According to the invention, the temperature of an object can be measured rapidly and accurately; and the temperature measurement method is especially suitable for non-contact temperature measurement.

The invention discloses a water body skin temperature-surface temperature synchronous measuring device which comprises at least one temperature measuring stick, an A/D converter and a processor. The upper segment and lower segment of the temperature measuring stick are respectively provided with multiple skin layer temperature probes and surface layer temperature probes which are arranged along the length direction of the temperature measuring stick in equal intervals. The skin layer temperature probes and surface layer temperature probes are electrically connected with the processor on the processor via the A/D converter. The temperature measuring stick is further provided with multiple pressure sensors. The invention also provides a method for calibrating satellite remote sensing by the measuring device. The method comprises the following steps: step one, temperature measurement is performed on a water body skin layer at the same location by adopting the measuring device and a thermal imaging device; step 2, calibrating transmission is performed on the thermal imaging device; and step 3, on-orbit calibrating is performed on the satellite remote sensing by the imaging device. Contact type measurement can be performed on an atmosphere bottom layer, the water body skin layer and an upper surface layer synchronously by the measuring device so that measurement accuracy is greatly enhanced.