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50results about "Fluid pressure measurement by thermal means" patented technology
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Heat conduction-type sensor for calibrating effects of temperature and type of fluid, and thermal flow sensor and thermal barometric sensor using this sensor
InactiveUS8667839B2Eliminate the effects ofWell formedVolume/mass flow by thermal effectsThermometer testing/calibrationThin film thermocouplesGas pressure transducer
A heat conduction-type sensor corrects (calibrate) effects of a temperature of a measurement target fluid and a type of the fluid on a measurement value in measurement of a flow velocity, a mass flow, or an atmospheric pressure. Also provided is a thermal flow sensor and a thermal barometric sensor with this correcting function, high sensitivity, simple configuration, and low cost. At least two thin films that are thermally separated from a substrate through the same cavity are provided, one thin film comprises a heater and a temperature sensor, and the other thin film comprises at least one temperature sensor, the temperature sensors being thin-film thermocouples. The thin film is arranged in proximity so that it is heated only through the measurement target fluid by heating of the heater. A calibration circuit calculates and compares quantities concerning heat transfer coefficients of a standard fluid and the unknown measurement target fluid.
Owner:GAKUIN TOHOKU
Heat conduction-type sensor for calibrating effects of temperature and type of fluid, and thermal flow sensor and thermal barometric sensor using this sensor
InactiveUS20120318058A1Eliminate the effects ofWell formedVolume/mass flow by thermal effectsFluid pressure measurement by mechanical elementsThin film thermocouplesAtmospheric air
A heat conduction-type sensor corrects (calibrate) effects of a temperature of a measurement target fluid and a type of the fluid on a measurement value in measurement of a flow velocity, a mass flow, or an atmospheric pressure. Also provided is a thermal flow sensor and a thermal barometric sensor with this correcting function, high sensitivity, simple configuration, and low cost. At least two thin films that are thermally separated from a substrate through the same cavity are provided, one thin film comprises a heater and a temperature sensor, and the other thin film comprises at least one temperature sensor, the temperature sensors being thin-film thermocouples. The thin film is arranged in proximity so that it is heated only through the measurement target fluid by heating of the heater. A calibration circuit calculates and compares quantities concerning heat transfer coefficients of a standard fluid and the unknown measurement target fluid.
Owner:GAKUIN TOHOKU
Apparatus and method for measuring altitude of terminal
ActiveUS20140174175A1Correction errorFluid pressure measurement using pressure-sensitive liquidHeight/levelling measurementMeasurement deviceAtmospheric sciences
An apparatus and a method for measuring an altitude of a terminal which can correct an altitude error according to temporal and spatial changes are provided. The apparatus includes an atmospheric pressure measuring unit for measuring an atmospheric pressure from a barometer included in the terminal, a position determiner for measuring position information of the terminal, and a controller for, when a reference atmospheric pressure reception period is not generated, predicting a current reference atmospheric pressure by using previously received reference atmospheric pressures and measuring a current altitude by using the predicted reference atmospheric pressure and the measured atmospheric pressure.
Owner:SAMSUNG ELECTRONICS CO LTD
Detector of low levels of gas pressure and flow
ActiveUS7490512B2Volume/mass flow by thermal effectsFluid pressure measurement by thermal meansDifferential pressureEngineering
A detector for monitoring the low levels of differential pressures and the rate of mass flow rate of gas (air, e.g.) in a duct. The sensor's temperature is maintained at a constant gradient above temperature of the flowing gas, typically 4-7° C. higher. The detector consists of two thermally decoupled sensors—one is the air temperature sensor and the other is a temperature sensor coupled to a heater. The sensors are connected to an electronic servo circuit that controls electric power supplied to the heater. The sensors are positioned outside of the air duct and coupled to the duct via a relatively thin sensing tube protruding inside the duct. The end of the tube has an opening facing downstream of the gas flow, thus being exposed to a static gas pressure. The detector can be employed in fuel burners of the HVAC systems, internal combustion engines, medical equipment to control flow of anesthetic gases, in the security systems to monitor minute changes in air pressure resulted from opening and closing of doors and windows in a protected facility.
Owner:CLEAN ALERT INNOVATIONS LLC
Heat conduction-type barometric sensor utilizing thermal excitation
InactiveUS20120118060A1Improve accuracySimple structureFluid pressure measurement using pressure-sensitive liquidThermometers using electric/magnetic elementsThermal expansionIntermittent heating
A heat conduction type barometric sensor has high sensitivity and high accuracy that has simple structure and circuit configuration and can measure a barometric pressure in the range of a very low barometric pressure to ≧1 atm using one sensor chip. The sensor includes a cantilever-shaped thin film provided with a thin-film temperature sensor, a heating element, and an excitation element. The excitation element utilizes warpage and bending based on a difference in thermal expansion between two main layers constituting the thin film during intermittent heating by a thin-film heater as the heating element. The two main layers are a silicon layer and a thermally oxidized film of silicon which are significantly different from each other in the coefficient of thermal expansion. A circuit in which the sensitivity is enhanced by the integration of a seebeck current for a predetermined period of time can be also provided.
Owner:KIMURA GIKEN KK
Electronic device and control method thereof
ActiveCN105828577AAccurate speed controlAchieve protectionHeight/levelling measurementPump controlConstant powerEngineering
The present invention provides an electronic device. The electronic device comprises a fan for heat radiation and a constant power heat source. The electronic device includes: a first temperature sensor configured to sense the ambient temperature and send the sensed ambient temperature to a calculation unit; a second temperature sensor configured to sense the temperature of the constant power heat source and send the sensed temperature of the constant power heat source to the calculation unit; and the calculation unit configured to calculate the atmospheric pressure at the position where the electronic device is located according to the ambient temperature, the sensed temperature of the constant power heat source and the rotating speed of the fan. The electronic device and the control method thereof are able to perform optimization of the fan application control method of an electronic device in the prior art to allow users to comprehensively take into account the pressure change caused by different altitude height of the application equipment where the electronic device is applied to realize the accurate control of the rotating speed of the fan so as to prevent elements of the device from damaging and realize the protection of the elements of the electronic device.
Owner:LENOVO (BEIJING) CO LTD
Detector of low levels of gas pressure and flow
ActiveUS20080053196A1Volume/mass flow by thermal effectsFluid pressure measurement by thermal meansDifferential pressureAnesthetic gases
A detector for monitoring the low levels of differential pressures and the rate of mass flow rate of gas (air, e.g.) in a duct. The sensor's temperature is maintained at a constant gradient above temperature of the flowing gas, typically 4-7° C. higher. The detector consists of two thermally decoupled sensors—one is the air temperature sensor and the other is a temperature sensor coupled to a heater. The sensors are connected to an electronic servo circuit that controls electric power supplied to the heater. The sensors are positioned outside of the air duct and coupled to the duct via a relatively thin sensing tube protruding inside the duct. The end of the tube has an opening facing downstream of the gas flow, thus being exposed to a static gas pressure. The detector can be employed in fuel burners of the HVAC systems, internal combustion engines, medical equipment to control flow of anesthetic gases, in the security systems to monitor minute changes in air pressure resulted from opening and closing of doors and windows in a protected facility.
Owner:CLEANALERT
Apparatus and method for testing compressed gas dispensing stations
Testing apparatus and method for testing compressed gas dispensing stations where a back pressure regulator is used to imitate filling of receiving vessels without the need for receiving vessels. A mass flow sensor measures the mass of compressed gas dispensed to the testing apparatus, and a controller calculates the pressure for the back pressure regulator to imitate filling of a receiving vessel.
Owner:AIR PROD & CHEM INC
Physical quantity sensor, altimeter, electronic apparatus, and moving object
InactiveUS20150268112A1Improve reliabilityImprove detection accuracyFluid pressure measurement using pressure-sensitive liquidFluid pressure measurement using ohmic-resistance variationEngineeringAltimeter
A physical quantity sensor includes: a diaphragm that can deflect and deform; a peripheral wall portion that is disposed around the diaphragm and has a thickness increasing in a direction away from the diaphragm; a deflection amount sensor that detects a deflection amount of the diaphragm; and a temperature sensor that is disposed in the peripheral wall portion.
Owner:SEIKO EPSON CORP
Micromachined pressure sensor and method of making the same
ActiveUS20180172532A1High accurate pressure dataLarge dynamic rangeFluid pressure measurement by electric/magnetic elementsFluid pressure measurement by thermal meansMetrologyDiaphragm structure
The design and manufacture method of a pressure sensor utilizing thermal field sensing with a thermal isolated membrane of a diaphragm structure is disclosed in the present invention. This device is made with silicon micromachining (a.k.a. MEMS, Micro Electro Mechanical Systems) process for applications of pressure measurement with large dynamic range, high accuracy and high stability during temperature variation. This device is applicable for all types of pressure metrology. The said thermal field pressure sensing device operates with thermistors on a membrane of the diaphragm structure made of silicon nitride with a heat isolation cavity underneath or a single side thermal isolated silicon nitride membrane with a reference cavity. This device can be seamlessly integrated with a thermal flow sensor with the same process.
Owner:WISENSTECH
Pressure change measurement device, altitude measurement device, and pressure change measurement method
ActiveCN107076628AFluid pressure measurement using elastically-deformable gaugesFluid pressure measurement by electric/magnetic elementsArithmetic processing unitMeasurement device
The present invention provides a pressure change measurement device and a pressure change measurement method that allow highly accurate detection of a change in pressure to be measured over time. Specifically, a reference value setting unit 60 provided to a pressure change measurement device 1 generates and outputs a reference value signal on the basis of an output signal of a differential pressure measuring cantilever 4 that is in a predetermined state. An arithmetic processing unit 30 calculates a change in pressure to be measured on the basis of the output signal, the reference value signal, the volume of a cavity 10, the amount of distribution of a pressure transmitting medium that is distributed inside and outside the cavity 10 per predetermined time unit, and the like.
Owner:SEIKO INSTR INC
Method for interacting with virtual scene through VR device, and display system
InactiveCN106951070AFully Develop Immersive ExperiencesInput/output for user-computer interactionFluid pressure measurement by thermal meansExpiratory AirflowFully developed
Embodiments of the invention relate to the technical field of virtual reality, in particular to a method for interacting with a virtual scene through a VR device, and a display system. The method comprises the steps of obtaining an airflow intensity value, wherein the airflow intensity value is detected by an airflow detection sensor in the VR device; and according to the airflow intensity value, obtaining corresponding image information and displaying the image information. According to the method and the display system, after the airflow intensity value is obtained, the corresponding image information can be obtained according to the airflow intensity value, and the image information is displayed, so that compared with a mode of performing interaction with the virtual scene through gesture identification or a gamepad, the method can be applied to the virtual scene related to expiratory airflow, so that immersive experience of a user can be fully developed and the application range of the VR device can be expanded.
Owner:SHANGHAI CHUANGGONG COMM TECH
Device for measuring the pressure of gas in pollution control or energy storage system
InactiveCN104755896ALow costReduce volumeFluid pressure measurement by thermal meansRapid change measurementProcess engineeringPollution
A device for measuring a pressure of a gas in a pollution control or energy storage system, including: a housing including an inlet and an outlet; a compound disposed inside the housing and configured to absorb at least one portion of gas entering the housing through the inlet, the non-absorbed portion of gas exiting the housing via the outlet; at least one sensor configured to measure a temperature of the compound; a processing unit configured to determine the pressure of the gas by using the temperature measurement from the sensor and a predefined pressure / temperature ratio.
Owner:INERGY AUTOMOTIVE SYST RES (SA)
Novel ''sandwich'' structure flexible hot-film micro sensor and manufacturing method thereof
ActiveCN109553061AHigh measurement accuracyImprove dynamic characteristicsTelevision system detailsPiezoelectric/electrostriction/magnetostriction machinesEngineeringSymmetric structure
The invention discloses a novel ''sandwich'' structure flexible hot-film micro sensor and a manufacturing method thereof, which belong to the field of micro electro mechanical systems (MEMS). The novel ''sandwich'' structure flexible hot-film micro sensor adopts a three-layer thin film structure of a top-layer thermosensitive unit 5, an intermediate insulating layer 3 and an underlying heating unit 6, wherein the top-layer thermosensitive unit 5 and the underlying heating unit 6 are electrically isolated by means of the intermediate insulating layer 3, and operate independently of each other.The top-layer thermosensitive unit 5 and the underlying heating unit 6 are of identical and symmetric structure size with the same operating temperature, eliminate the heat conduction from the top-layer thermosensitive unit to a substrate, greatly improve the measurement precision and dynamic properties of the sensor, realizes manufacturing of the sensor structure by means of thin film depositionand twice photolithography processes, and ensures the spatial position relationship between the top-layer thermosensitive unit 5 and the underlying heating unit 6.
Owner:西安砺芯慧感科技有限公司
Physical quantity sensor, altimeter, electronic apparatus, and moving object
InactiveCN104931187AImprove reliabilityFluid pressure measurement using elastically-deformable gaugesFluid pressure measurement by electric/magnetic elementsEngineeringAltimeter
A physical quantity sensor includes: a diaphragm that can deflect and deform; a peripheral wall portion that is disposed around the diaphragm and has a thickness increasing in a direction away from the diaphragm; a deflection amount sensor that detects a deflection amount of the diaphragm; and a temperature sensor that is disposed in the peripheral wall portion.
Owner:SEIKO EPSON CORP
Constant-temperature type hot-film shear stress micro-sensor closed-loop feedback control system
ActiveCN108519189AReduce measurement errorReduce the difficulty of calibrationFluid pressure measurement using ohmic-resistance variationFluid pressure measurement by thermal meansWire resistanceInstrumentation
Owner:NORTHWESTERN POLYTECHNICAL UNIV
GIS internal air pressure monitoring device based on temperature sensor
PendingCN106908188AReduce volumeReduce weightMeasurement of fluid loss/gain rateTransmission systemsData displayAnti jamming
The invention discloses a GIS internal air pressure monitoring device based on a temperature sensor. The device comprises a temperature acquisition and transmission module arranged in a GIS and used for temperature acquisition and transmission, and a data display and processing module arranged outside the GIS and used for GIS internal air pressure analysis. The temperature acquisition and transmission module comprises a temperature sensor and a temperature acquisition antenna which are connected in sequence. The data display and processing module comprises a temperature acquisition module, a temperature display unit, a data processing unit and an alarm unit which are connected in sequence. The internal temperature of the GIS is acquired through the temperature acquisition unit, and the gas leakage amount of the GIS is calculated through the temperature rising value according to the relation between the internal gas temperature and air pressure of the GIS. The device has the advantages of being small in size, low in weight, convenient to install, high in accuracy, visual in display, high in stability and high in anti-jamming capacity.
Owner:南京科瑞电力科技有限公司
Pressure detection method based on metastable phase rare-earth nickel-based oxide
ActiveCN110146199AImprove pressure measurement accuracyFluid pressure measurement using ohmic-resistance variationForce measurement using piezo-resistive materialsElectrical resistance and conductanceRare earth
The invention belongs to the field of ultrahigh pressure detection and relates to a pressure detection method based on a metastable phase rare-earth nickel-based oxide. According to the pressure detection method, a rare-earth nickel-based oxide with a thermodynamic metastable phase structure is used as a pressure sensitive material in a pressure detector; and pressure measurement in a high-pressure and ultrahigh-pressure spectral range is realized by utilizing a characteristic that the rare-earth nickel-based oxide changes sensitively along with pressure in the high-pressure and ultrahigh-pressure range and the relation of the change of resistivity and a resistance temperature coefficient along with pressure. Compared with previous pressure measuring methods, the method can realize pressure measurement in the spectral range, and realize the cross validation of pressure measurement in the high-pressure and ultrahigh-pressure range through the comprehensive characterization of the resistivity and a resistance temperature change rate, thereby greatly improving pressure measurement precision in the high-pressure range. The method of the invention can be further applied to the aspects of high-pressure detection, deep sea pressure measurement, geological pressure measurement and the like.
Owner:UNIV OF SCI & TECH BEIJING +1
Micromachined pressure sensor and method of making the same
ActiveUS10209156B2Easy to manufactureAccurate dataFluid pressure measurement by electric/magnetic elementsFluid pressure measurement by thermal meansMetrologyDiaphragm structure
The design and manufacture method of a pressure sensor utilizing thermal field sensing with a thermal isolated membrane of a diaphragm structure is disclosed in the present invention. This device is made with silicon micromachining (a.k.a. MEMS, Micro Electro Mechanical Systems) process for applications of pressure measurement with large dynamic range, high accuracy and high stability during temperature variation. This device is applicable for all types of pressure metrology. The said thermal field pressure sensing device operates with thermistors on a membrane of the diaphragm structure made of silicon nitride with a heat isolation cavity underneath or a single side thermal isolated silicon nitride membrane with a reference cavity. This device can be seamlessly integrated with a thermal flow sensor with the same process.
Owner:WISENSTECH
Heat conduction-type barometric sensor utilizing thermal excitation
InactiveUS8453501B2High sensitivitySimple configurationFluid pressure measurement using pressure-sensitive liquidThermometers using electric/magnetic elementsThermal dilatationHemt circuits
A heat conduction type barometric sensor has high sensitivity and high accuracy that has simple structure and circuit configuration and can measure a barometric pressure in the range of a very low barometric pressure to ≧1 atm using one sensor chip. The sensor includes a cantilever-shaped thin film provided with a thin-film temperature sensor, a heating element, and an excitation element. The excitation element utilizes warpage and bending based on a difference in thermal expansion between two main layers constituting the thin film during intermittent heating by a thin-film heater as the heating element. The two main layers are a silicon layer and a thermally oxidized film of silicon which are significantly different from each other in the coefficient of thermal expansion. A circuit in which the sensitivity is enhanced by the integration of a seebeck current for a predetermined period of time can be also provided.
Owner:KIMURA GIKEN KK
Non-contact pressure measuring device and method
InactiveCN111678636ANo need to change the structureMeet the needs of pressure measurementFluid pressure measurement using elastically-deformable gaugesFluid pressure measurement by thermal meansControl powerContact pressure
The invention relates to a pressure measuring device and method, in particular to a non-contact pressure measuring device and method, which are suitable for pressure measurement of a gas cylinder module in a rocket attitude and orbit control power system and are also generally suitable for other pressure containers with pressure measurement requirements. The technical problems that the sealing reliability and safety of an original structure are reduced and long-term pressure monitoring is not facilitated in the prior art are solved. The non-contact pressure measuring devicecomprises a cable, ademodulator, a strain sensor and a temperature sensor, wherein the strain sensor and the temperature sensor are respectively adhered to the outer surface of the pressure-bearing shell of the gas cylinder module to be measured; the strain sensor and the temperature sensor are connected with the demodulator through the cable; and the demodulator is provided with a calibration value input equipmentinterface. The method is carried out by using the device.
Owner:XIAN AEROSPACE PROPULSION INST
Method for inversion of sea surface air pressure by MWTS-II and MWHTS fusion
ActiveCN112254866AHigh precisionRich sea surface pressure informationFluid pressure measurement by thermal meansNeural architecturesData setBrightness temperature
The invention discloses a method for inversion of sea surface air pressure by MWTS-II and MWHTS fusion. The method comprises the following steps: establishing a brightness temperature matching pair ofMWTS-II observation brightness temperature and MWHTS observation brightness temperature in time and space; establishing a matching data set of the brightness temperature matching pair and the sea surface air pressure in time and space, and forming an analysis data set and a verification data set; training a BP neural network by utilizing the analysis data set, and sorting contribution of the observation brightness temperature of each channel to inversion of sea surface air pressure according to a training result; increasing the observation brightness temperatures of the channels one by one according to the descending order of the contribution of the observation brightness temperature of each channel to inversion of the sea surface air pressure, training a BP neural network, and an optimalchannel combination for inversion of the sea surface air pressure by MWTS-II and MWHTS fusion can be established according to the training result. Compared with a single satellite-borne microwave radiometer for inversion of the sea surface air pressure, the method can acquire higher inversion precision, and is simple and easy to operate.
Owner:LUOYANG NORMAL UNIV
Method for testing sensitivity of MWTS-II to sea surface air pressure based on natural atmosphere
ActiveCN112345151AAvoid the adverse effects of calculation errorsIn line with the actual atmospheric sceneFluid pressure measurement by thermal meansAtmospheric layerData set
The invention discloses a method for testing the sensitivity of MWTS-II to sea surface air pressure based on natural atmosphere, and belongs to the technical field of microwave remote sensing. The method comprises the following steps of: establishing a matching data set of MWTS-II observation brightness temperature and a natural atmosphere data set, and establishing a clear sky matching data set;calculating an MWTS-II channel weight function based on the clear sky matching data set, and respectively establishing a clear sky adjustment data set for each channel of the MWTS-II according to thedistribution rule of atmospheric layers where the peak value of the weight function of each channel of the MWTS-II is located; according to the atmospheric layers where the peak value of the weight function of each channel of the MWTS-II is located, based on the clear sky adjustment data sets, respectively establishing a test data set for testing the sea surface air pressure sensitivity for each channel of the MWTS-II; as for each channel of the MWTS-II, respectively establishing the change relation of the observation brightness temperature of each channel of the MWTS-II along with the sea surface air pressure, and completing the sensitivity test of the MWTS-II on the sea surface air pressure. According to the method, the change relation of the observation brightness temperature of each channel of the MWTS-II along with the sea surface air pressure can be reflected more truly, the sensitivity of the sea surface air pressure can be tested more accurately, and the operation is simple andeasy to implement.
Owner:LUOYANG NORMAL UNIV
Apparatus and method for measuring altitude of terminal
ActiveUS9618337B2Fluid pressure measurement by mechanical elementsHeight/levelling measurementAtmospheric airComputer terminal
An apparatus and a method for measuring an altitude of a terminal which can correct an altitude error according to temporal and spatial changes are provided. The apparatus includes an atmospheric pressure measuring unit for measuring an atmospheric pressure from a barometer included in the terminal, a position determiner for measuring position information of the terminal, and a controller for, when a reference atmospheric pressure reception period is not generated, predicting a current reference atmospheric pressure by using previously received reference atmospheric pressures and measuring a current altitude by using the predicted reference atmospheric pressure and the measured atmospheric pressure.
Owner:SAMSUNG ELECTRONICS CO LTD
Pressure sensor based on thermopile principle
ActiveCN112414609ASimple structureImprove reliabilityFluid pressure measurement by electric/magnetic elementsForce measurementThermopileEngineering
The invention discloses a pressure sensor, which comprises a cavity film for sensing the pressure, a heating resistor, an air cavity, a thermopile, a radiator and a substrate; the cavity film for sensing pressure is positioned above the substrate, the thin air cavity is formed between the cavity film and the substrate, and the radiator is positioned on the upper surface of the substrate in the aircavity; the heating resistor is located above the air cavity on the upper surface of the cavity film, and the thermopile is arranged near the heating resistor. When no external pressure exists, current excitation is applied to the heating resistor, stable temperature distribution is formed near the heating resistor, and the thermopile placed near the heating resistor senses the temperature changeand outputs initial thermoelectric potential. And when the external pressure is increased, the cavity film deforms and is in contact with the radiator to form a radiating passage, so that the thermoelectric potential is reduced and the pressure is measured. Adjustment of the pressure detection range and sensitivity is achieved by changing the magnitude of applied current excitation, and the sensor has the advantages of being high in sensitivity, large in measurement range, flexible in design, simple in structure and the like.
Owner:NANJING GAOHUA TECH
Apparatus and method for testing compressed gas dispensing stations
ActiveCN110878905AVolume/mass flow measurementGas handling applicationsEngineeringMechanical engineering
A testing apparatus and method for testing compressed gas dispensing stations are provided, wherein a back pressure regulator is used to imitate filling of receiving vessels without the need for receiving vessels. A mass flow sensor measures the mass of compressed gas dispensed to the testing apparatus, and a controller calculates the pressure for the back pressure regulator to imitate filling ofa receiving vessel.
Owner:AIR PROD & CHEM INC
Device for measuring the pressure of a gas in a pollution control or energy storage system
InactiveUS20150185101A1Low costSmall and easy to assembleMaterial thermal analysisFluid pressure measurement by thermal meansProcess engineeringProduct gas
A device for measuring a pressure of a gas in a pollution control or energy storage system, including: a housing including an inlet and an outlet; a compound disposed inside the housing and configured to absorb at least one portion of gas entering the housing through the inlet, the non-absorbed portion of gas exiting the housing via the outlet; at least one sensor configured to measure a temperature of the compound; a processing unit configured to determine the pressure of the gas by using the temperature measurement from the sensor and a predefined pressure / temperature ratio.
Owner:INERGY AUTOMOTIVE SYST RES (SA)
Measuring device and method for continuous distribution of pore pressure and quantitative evaluation method for tensile stress
ActiveCN112504544BAccurate radial tensile stressGuaranteed accuracyFluid pressure measurement by thermal meansMeasurement of force componentsData acquisitionThermographic camera
The invention provides a device and method for measuring continuous distribution of pore pressure and a quantitative evaluation method for tensile stress, belonging to the field of solid-phase output control of deep high-pressure gas wells. The device includes a cylinder body, a thermal imaging instrument, a compressor, a gas tank and data acquisition system, the inlet of the cylinder is provided with a gas inlet pressure sensor, the gas outlet is provided with a gas outlet pressure sensor, the gas inlet pressure sensor, the gas outlet pressure sensor, the flow sensor and the thermal imaging instrument are all connected to the data acquisition system through a data line connect. This method starts from the method of accurately predicting pore pressure, and considers the tensile stress caused by poroelasticity and fluid drag at the same time, and finally obtains the accurate radial tensile stress. Based on the tensile failure criterion, the solid phase production conditions are guaranteed Accurate prediction, obtaining continuous pore pressure distribution equations from experiments, ensures the accuracy of tensile stress calculation.
Owner:XI'AN PETROLEUM UNIVERSITY
A Closed-loop Feedback Control System of Thermostatic Hot Film Shear Stress Microsensor
ActiveCN108519189BReduce measurement errorReduce the difficulty of calibrationFluid pressure measurement using ohmic-resistance variationFluid pressure measurement by thermal meansMicrocontrollerClosed loop feedback
The invention discloses a constant-temperature type hot-film shear stress micro-sensor closed-loop feedback control system, and belongs to the field of sensor measuring instruments. The adopted technical scheme of the invention comprises a hardware circuit design and an algorithm design of the hot-film shear stress micro-sensor closed-loop feedback control system. The hardware circuit is formed bya fixed resistor1, a flexible hot-film shear stress micro-sensor 4, a simulation operational amplifier 6, an instrument operational amplifier 7, a simulation multiplier 8, a microcontroller 9, and alow-noise amplifier 10. The algorithm design comprises threshold setting, design of an integration link and design of a proportion link. According to the constant-temperature type hot-film shear stress micro-sensor closed-loop feedback control system, through the design form of four-wire system measurement of the sensor resistance, the measuring error caused by a lead wire resistance of the hot-film shear stress micro-sensor is greatly reduced, and the calibration difficulty of the hot-film shear stress micro-sensor in a practical application process is reduced; besides, through dynamic and real-time adjustment of the algorithm of the microcontroller 9, the problems that according to a conventional design scheme, a self-excitation state is entered due to large-range change of the flow velocity of a flow field, and normal operation is failed are avoided.
Owner:NORTHWESTERN POLYTECHNICAL UNIV
A Pressure Detection Method Based on Metastable Rare Earth Ni-based Oxide
ActiveCN110146199BImprove pressure measurement accuracyFluid pressure measurement using ohmic-resistance variationForce measurement using piezo-resistive materialsUltra high pressurePhysical chemistry
The invention belongs to the field of ultrahigh pressure detection and relates to a pressure detection method based on a metastable phase rare-earth nickel-based oxide. According to the pressure detection method, a rare-earth nickel-based oxide with a thermodynamic metastable phase structure is used as a pressure sensitive material in a pressure detector; and pressure measurement in a high-pressure and ultrahigh-pressure spectral range is realized by utilizing a characteristic that the rare-earth nickel-based oxide changes sensitively along with pressure in the high-pressure and ultrahigh-pressure range and the relation of the change of resistivity and a resistance temperature coefficient along with pressure. Compared with previous pressure measuring methods, the method can realize pressure measurement in the spectral range, and realize the cross validation of pressure measurement in the high-pressure and ultrahigh-pressure range through the comprehensive characterization of the resistivity and a resistance temperature change rate, thereby greatly improving pressure measurement precision in the high-pressure range. The method of the invention can be further applied to the aspects of high-pressure detection, deep sea pressure measurement, geological pressure measurement and the like.
Owner:UNIV OF SCI & TECH BEIJING +1
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