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148results about How to "Eliminate the effects of measurement accuracy" patented technology
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Lens refractive index and thickness measuring method and device based on differential confocal technology
InactiveCN101769821AHigh measurement accuracySimple and fast operationUsing optical meansTesting optical propertiesOptical axisRefractive index
The invention relates to a lens refractive index and thickness measuring method and a device based on the differential confocal technology, which belong to the technical field of optical precise measurement. The invention is used for the high-precision measurement of the refractive index and the thickness of a spherical lens. The invention is based on a ray tracing principle, utilizes an absolute zero point of a laser differential confocal responding curve for accurately determining the intersection point of the front surface of the lens to be measured and an optical axis, the intersection point of the back surface of the lens to be measured and the optical axis, and the position of a measuring lens with or without the lens to be measured, then, the position of the measuring lens and the curvature radius, the focal length and the pupil of the measuring lens which are measured in advance are utilized for carrying out facet ray tracing calculation on two spherical surfaces of the lens to be measured and the reference reflecting surface, and finally, the high-precision nondestructive measurement on the refractive index and the thickness of the lens to be measured is realized. The invention has the obvious advantages of simple operation, high measuring precision, strong environmental disturbance resistance capability and the like, and can be widely applied to the refractive index and thickness measurement of various spherical lenses, particularly the refractive index and thickness measurement field of thin lenses.
Owner:BEIJING INSTITUTE OF TECHNOLOGYGY
Dual-wavelength binocular vision seam tracking method and tracking system
ActiveCN104942404AAccurate measurementOvercoming strong arcArc welding apparatusReconstruction algorithmVisual perception
The invention discloses a dual-wavelength binocular vision seam tracking method. The method comprises the steps including image acquisition, data processing, seam tracking and the like. The invention further discloses a tracking system for implementing the method. The system adopts a near-infrared and structured light dual-wavelength binocular vision sensing system, images of a molten pool and different wavelengths of seam area images with of seams are measured simultaneously and transmitted to a miniature industrial control computer, and the seam positions are measured accurately with a multi-information fusion algorithm and a seam image three-dimensional reconstruction algorithm; the miniature industrial control computer adopts the Kalman filter algorithm to perform optimal estimation on the seam tracking deviation state according to a seam position detection result, a servo driver drives a servo motor to move so as to control a 3-axis motion workbench to generate corresponding motion, a welding torch or a laser head is controlled for deviation correction, and the seams are tracked accurately. The system can eliminate hard light, splashing and electromagnetic interference on a welding site and improve the seam tracking accuracy and reliability.
Owner:GUANGDONG UNIV OF TECH +1
Screw rotor type surface profile error measurement instrument
ActiveCN102538700AAvoiding Probe Radius Compensation ProblemsHigh measurement accuracyUsing optical meansEngineeringHeadstock
The invention discloses a screw rotor type surface profile error measurement instrument. The screw rotor type surface profile error measurement instrument is characterized in that: a measured rotor is supported between a headstock center and a tailstock center, and the measured screw rotor is driven by rotary working platforms to rotate; and a movable working platform is arranged, a measurement unit is arranged on the movable working platform, a long grating sensor for detecting the position of the movable working platform is arranged in the measurement unit, and a laser displacement sensor is fixedly arranged on an electric rotary disk. According to the screw rotor type surface profile error measurement instrument disclosed by the invention, the original measurement data on the screw rotor type surface feature is acquired under the motion coordination of two rotary working platforms and a one-dimensional translation platform by using the laser displacement sensor, and the corresponding data treatment and coordinate conversion are performed, so that the screw rotor type surface profile error data can be obtained and the error assessment result is given; and the screw rotor type surface profile error measurement instrument is simple in structure and good in processing and assembling performance, and is capable of realizing the surface profile error measurement on various screw surfaces and compatibly equipping sensors of other types for precise measurement of other parameters.
Owner:HEFEI UNIV OF TECH
Differential confocal-low coherent interference combination refractivity and thickness measurement method and apparatus
InactiveCN101509828AHigh measurement accuracyInformativeUsing optical meansTesting optical propertiesRefractive indexClassical mechanics
The invention belongs to the technical field of optical precision measurement and relates to a measurement method for the combined refractive index and thickness of differential confocal aspect and low coherence interference and a device. The method first determines the positions of a measuring objective and a reference part corresponding to the front surface position and back surface position of a measured sample respectively through differential confocal and focus principle and low coherence interference principle, and then measures the displacement distance Delta z of the measuring objective and the displacement distance Delta l of the reference part, and the displacement distances are substituted into a formula to calculate the refractive index and thickness of the measured sample. The invention first proposes the use of the characteristic that a differential confocal response curve corresponds to the focus of a micro objective in zero crossing for realizing precise focus and extends the differential confocal micro principle to the refractive index and thickness measurement field, forming the differential confocal thickness measuring principle. By integrating the differential confocal and focus principle and low coherence interference technology, the invention has the advantages of high measurement precision and strong capability of resisting ambient interference and can be applied to the detection of the refractive index and thickness of a sample.
Owner:BEIJING INSTITUTE OF TECHNOLOGYGY
Method and device for detecting mass flow rate of pulverized coals in process of conveying pulverized coals
ActiveCN102853870AEliminate the effects of measurement accuracyIndirect mass flowmetersRadiodensitySensor array
The invention discloses a method and device for detecting mass flow rate of pulverized coals in a process of conveying the pulverized coals. Sound waves generated by frictions and collision of fluid particles in a non-invasive pick-up pipe with a pipe wall are used to detect medium flow rate in the pipe, thereby solving the problem of large errors in a metering method of the pulverized coals, and improving the measuring accuracy. Sound wave detection is a non-invasive detection method, and a detection device is simple, safe, environmental-friendly, and is suitable for online detection in an industrial production process. A sound wave sensor array is used, and influences of unstable conveyance of the pulverized coals on the measuring accuracy can be effectively eliminated by fusing data of a plurality of sensors. Compared with the prior art, flow velocity, humidity ratio, particle size and mass flow-rate detection technologies based on the sound wave detection are more sensitive, and higher in the detection accuracy, and can be used for replacing a radioactive density meter harmful to a human body.
Owner:CHINA PETROLEUM & CHEM CORP +1
Soil heavy metal pollution quantification detecting system and detecting method
InactiveCN101196471AAvoid Nonlinear RelationshipsHigh measurement accuracyAnalysis by material excitationPhysicsDynamometer
The invention discloses a soil heavy metal pollution quantification testing system and the testing method, which is used to conduct quantification monitoring to medium and light heavy metal polluted soil. The quantification testing system of the invention comprises a laser, a beam splitter, a collecting optics lens, an optical fiber detector, optical fiber, a spectrograph, a laser dynamometer instrument and a computer. The quantification testing system of the invention normalizes the laser induction and plasma spectrum strength value of the trace element in soil standard sample into the strength value of injecting laser, and then utilized the linear relation between the normalized value and the element content to build calibrating plot, and finally utilizes the calibrating plot and the same normalization method to conduct quantitative detecting to the heavy metal element in the unknown soil sample.
Owner:SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
Micro-nano structure and morphology measurement device and method based on digital scanning and white light interference
ActiveCN103900493AEliminate the effects ofImprove anti-interference abilityUsing optical meansMicro nanoMeasurement device
The invention provides a micro-nano structure and morphology measurement device and method based on digital scanning and white light interference. The method includes the steps of projecting white light processed through beam expanding and collimation to the surface of an object to the measured and the surface of a reference mirror inside an interference microscope through semi-transparent and semi-reflective mirrors by means of a device composed of a digital micro mirror array, an imaging unit, the semi-transparent and semi-reflective mirrors, a white light source, an interference microscope objective, the object to be measured, a working table, a control unit, a spectrograph, optical fibers and an optical fiber coupling unit, enabling the white light to interfere with reflected light, obtaining the interference light intensities through the semi-transparent and semi-reflective mirrors, obtaining the surface of the digital micro mirror array through the imaging unit, controlling the micro mirror defection angles corresponding to pixels of the digital micro mirror array one by one so that the light intensities corresponding to different pixels can enter the optical fiber coupling unit one by one, transmitting spectral information obtained by a spectrograph and corresponding to the interference light intensities to the control unit, and conducting phase analysis on distribution of the spectrums corresponding to the interference light intensities to obtain the relative height of the surface of the object to be measured. The micro-nano structure and morphology measurement device and method have the advantages that the structure is simplified, the measurement accuracy is high, and the anti-interference capacity is high.
Owner:INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
Method and apparatus for measuring cofocal combined ultra-long focal distance
InactiveCN101408478AReduce the measurement optical path lengthReduce the impactTesting optical propertiesPhysicsFocal position
The invention belongs to the technical field of optical precision measurement, and relates to a method for measuring super long focal length of a confocal combination lens and a device thereof. The method is as follows: firstly determining the focal position of a reference lens and the focal position of the combination of the measured lens and the reference lens according to the confocal focusing principle, measuring the distance delta between the two focal points and the distance d0 between the two lenses, and substituting the delta and the d0 into a formula to calculate the focal length value of the measured lens, a pupil filtering technique can also be used in the measurement to enhance the sensitivity of focal length measurement. The invention proposes that accurate focusing is realized by the characteristics that an object corresponds to the microscope objective focus when the confocal point responds to the maximum curve value, and extends the confocal microscopy principle to the super long focal length measurement field, and proposes the confocal focusing principle. The method combines the confocal focusing principle with the combination lens method, has the advantages of high measurement precision and strong anti-environment interference ability, and can be used for high-precision focal length measurement during the detection and assembly of the super-long focal length lens.
Owner:BEIJING INSTITUTE OF TECHNOLOGYGY
Online monitoring system for measuring thickness of clean-surface panel
InactiveCN1670472ADoes not affect measurement accuracyRealize measurementUsing optical meansSignal conditioning circuitsMonitoring system
This invention relates to smooth surface board materials thickness on-line measurement and especially to the ones influenced by temperature, which comprises the following steps: eliminating the impact on the structure deformation from temperature through extra set mark block in each journey. The measured board thickness signals from laser sensor, temperature compensation thickness signals and rack journey position signals are sent to the working control machine to accomplish the signal process to realize the monitoring.
Owner:JIAXING UNIV
Sensing ring of all-fiber electronic current transformer
The invention discloses a sensing ring of an all-fiber electronic current transformer, which consists of a sensing ring body, a sensing ring upper cover, a sensing optical fiber, a reflector, a 1 / 4 wave plate and a polarization-preserving fiber, wherein both the sensing ring body and the sensing ring upper cover have an annular structure, a U-shaped groove is preserved on the upper surface of the sensing ring body and the sensing optical fiber is wound at the bottom surface of the U-shaped groove uniformly; the sensing ring upper cover is fixed on the upper part of the sensing ring body and closes the U-shaped groove; and the reflector and the 1 / 4 wave plate are positioned on two ends of the sensing optical fiber respectively and fixed in the U-shaped groove, the reflector and the 1 / 4 wave plate are parallel in the direction of the tangents of the annular structures and arranged in a way of clinging together along the direction of the normal of the annular structures, and the tail end, fixedly provided with the 1 / 4 wave plate, of the sensing optical fiber is connected with the polarization-preserving fiber which serves as the leading-out end of the sensing ring. The sensing ring has the characteristics of flexible application mode, small volume, light weight, high safety, convenient installation and maintenance and the like and provides a necessary guarantee for the development and application of the all-fiber electronic current transformer.
Owner:NAE BEIJING ELECTRIC CONTROL TECH
High-voltage electrical appliance insulation parameter on-line monitoring method based on reference phase method
InactiveCN1566976ASolve long-distance transmissionGuaranteed accuracyTesting dielectric strengthCapacitanceElectrical devices
This invention relates to an on-line monitoring method of high-pressure electrical apparatus insulation parameters based on preference phase method, which comprises data collection, data process and analysis and diagnose decision-making. The online monitoring system is divided into two categories: integral online monitoring system and distributed online monitoring system which is mainly monitor the dielectric loss and constant capacitance of capacity apparatus. It is characterized by adopting reference phase method and locating sensors used for collecting reference phase signals in each monitoring unit. This invention avoids the long distance transmission of PT secondary voltage signals and can ensure both the accuracy of insulation parameters measuring and increase the safety reliability of the system; it adopts reference phase to increase the measuring accuracy of insulation parameters; it eliminates all impacts generated by absolute angle errors of the sensor itself on the insulation parameter measuring with high application values.
Owner:上海智光电力技术有限公司
Velocity measurement method based on stereoscopic vision
ActiveCN101915852AEasy to installEasy maintenanceDevices using time traversedElectromagnetic wave reradiationLow noiseOmega
The invention discloses a velocity measurement method based on stereoscopic vision, which comprises the following steps of: S1. acquiring the image of a static marker ahead when a carrier runs and processing the image in space dimension and time dimension according to the correlation of the image in space and time to obtain the measured value of running velocity of the carrier; and S2. measuring change rate omega of gradient Phi of the orbit of the carrier and acceleration speed ax of the carrier in running direction, establishing a process model and a measurement model which are used for estimating running velocity on the basis of the measured value of running velocity, the change rate omega and the acceleration speed ax, and estimating the running velocity of the carrier as the final result by Kalman filter algorithm according to the process model and the measurement model. The method can eliminate influence of wheel idling and slipping on the velocity measurement accuracy and realize low noise and real-time velocity measurement.
Owner:TRAFFIC CONTROL TECH CO LTD
Essential explosion-proof liquid level detection device and method
ActiveCN101424562AGood securityImprove detection accuracyConverting sensor output opticallyLevel indicators by pressure measurementPetrochemicalMillimeter
The invention discloses an essence explosion proof type liquid level height detecting device and aw method. The essence explosion proof type liquid level detecting device comprises a wavelength analyzer, an optical cable, and a fiber grating buoyancy drawing device, wherein the fiber grating buoyancy drawing device comprises a buoyancy pontoon, a fiber grating and a fixing end, the wavelength analyzer emits light wave with certain frequency range to the fiber grating through the optical cable and receives the light wave reflected back by the fiber grating, the reflected light is analyzed, and the liquid level height of the liquid to be detected is calculated. Compared with the prior art, the device and the method have the advantages that the detected point can have no power supply, the device can be widely applied to explosive and flammable environment or highfield powerful electromagnetic environment such as petrochemical industry, and the like, the detection in a long distance can be realized; meanwhile, the detection accuracy is high, the millimetre-sized accurate measurement can be realized; moreover, the device and the method can realize network interconnection to intensively monitor the liquid level height of a plurality of places.
Owner:T&S COMM
FBG (Fiber Bragg Grating) liquid level sensor and preparation method thereof
ActiveCN102865900AEliminate measurement errorsEliminate the effects of measurement accuracyLevel indicators by pressure measurementFiberGrating
The invention discloses an FBG (Fiber Bragg Grating) liquid level sensor and a preparation method thereof. The sensor comprises a metal base, pressure sensing membranes, two metal capillary tubes, optical fibers carved with two FBGs having different wavelengths, pins and a tail fiber sleeve, wherein the optical fibers penetrate into the two metal capillary tubes; an FBG is located in the first metal capillary tube; a sensing FBG is located between the two metal capillary tubes to form a structural unit; the pressure sensing membranes are fixed on the metal base, and an air cavity is formed between the pressure sensing membranes; the structural unit is located in the air cavity; the first metal capillary tube is located at the center of each pressure sensing membrane; the optical fibers are vertical to the plane where the pressure sensing membranes locate; the second tube capillary tube stretches out of the metal base and is positioned by the pins; and the tail fiber sleeve is fixed at the lower end of the metal base to be communicated with atmosphere. The metal capillary tubes are titanium tubes; and the metal base is made of stainless steel. The sensor can be applied to inflammable, explosive and strongly-corrosive liquid, and has the advantages of wide dynamic range, an FS with the precision of 0.5%, a linearity of 99.7%, electromagnetic interference resistance, easy reusability and the like.
Owner:WUHAN UNIV OF TECH
Three-dimensional target scattering coefficient measurement method based on MIMO array technology
ActiveCN101509974ARealize three-dimensional high-resolution measurementImprove measurement efficiencyRadio wave reradiation/reflectionMultiple inputElectromagnetism
The invention provides a method for measuring the scattering coefficient of a three-dimensional target, which is based on the multiple-input and multiple-output array technology, and the method synthesizes a large two-dimensional antenna array by controlling the antenna of the multiple-input and multiple-output array to accurately move on a one-dimensional platform, and then obtaining three-dimensional high resolution distribution of the scattering coefficient of the target by being combined with the pulse compressing technology in signal processing, thus realizing three-dimensional high resolution measurement to the scattering coefficient of the target. The method overcomes the defects of large calculation amount, approximate error, difficult application and complicated target and broadband signal of the method for calculating the scattering coefficient of the target on the basis of computational electromagnetics and the defects of low resolution and being incapable of measuring large targets in the method for measuring the scattering coefficient of the target in a microwave dark room. The method is applicable to the fields of target scattering property research, stealth material / aircraft design, and the like.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
NDIR gas sensor system and temperature and humidity compensation method thereof
InactiveCN110006837AControl volumeMiniaturizationColor/spectral properties measurementsNeural architecturesPyroelectric detectorsHandling system
The invention relates to an NDIR gas sensor system. The NDIR gas sensor system comprises an infrared sensor unit, a microprocessor and a concentration display unit, wherein the microprocessor system is connected with the infrared sensor unit and the concentration display unit; a sampling air chamber can effectively prolong an optical path and can control the volume of the air chamber to facilitatethe miniaturization of the sensor. The potassium bromide (KBr) window piece is arranged to avoid corrosion of a pyroelectric detector, the service life of the sensor is prolonged, and the optical paths of the measuring channel and the reference channel are completely symmetrical, so that the structural design of the single light source dual-optical path can eliminate the influence of external factors such as light source shake, optical device pollution and the like on the measuring precision to a certain extent. The NDIR gas sensor system and the temperature and humidity compensation method thereof employ a GSO-BP neural network to perform temperature and humidity compensation to overcome the defects of the empirical formula compensation method and the circuit compensation method in the prior art and lead the compensation process to be simpler and more accurate, and therefore, the precision is high, the cost is low and the structure is small compared to the prior art.
Owner:NANJING UNIV OF INFORMATION SCI & TECH
Rotary optical electric field sensor and method for measuring electric field by the same
PendingCN108693413AHigh measurement accuracyEliminates effects on long-term operational stabilityElectrostatic field measurementsElectric field sensorElectrical field strength
The invention, which belongs to the technical field of electric field measurement, discloses a rotary optical electric field sensor and a method for measuring an electric field by the same. The sensoris composed of a laser diode driver, a laser diode, an optical electric field sensing head, a photoelectric detector, a signal processing system and a photoelectric rotational speed sensor. A metal sensing polar plate senses a to-be-measured electric field strength; an optical signal arrives at the photoelectric detector through the rotating optical electric field sensing head; the photoelectricrotational speed sensor measures the rotation speed of the sensing head; and an electrical signal outputted by the photoelectric detector and a rotating speed of the photoelectric rotational speed sensor are sent to the signal processing system respectively. In addition, according to the method for measuring an electric field, noises in a signal are filtered based on a Kalman filter algorithm; theprocessed signal is transmitted to the voltage signal processing unit to obtain an alternating-current component and a direct-current component by separation; and then a regulation amount and a to-be-measured electric field strength are obtained. According to the invention, influences on the sensor stability by factors like the light intensity and temperature as well as the influence on the sensor measurement precision by the charge drift can be eliminated; and the measurement precision is improved.
Owner:NORTH CHINA ELECTRIC POWER UNIV (BAODING)
A dual-axis transmission line tower tilt sensor
ActiveCN102297682ARealize automatic collectionCompact structureIncline measurementData acquisitionElectromagnetic interference
The invention discloses a double-shaft transmission lien tower inclination sensor, which comprises a housing and is characterized in that one end of the housing is connected with an installation base; a transmission circuit board and a sensor circuit board are disposed inside the space formed by the housing and the installation base; one end of a cable conductor passes through the other end of the housing and is connected to the transmission circuit board; and the other end of the cable conductor is connected with a data collector. The sensor provided by the invention is compact in structure and small in size, and has strong anti-electromagnetic interference capability; while working on site, solar sheets are used to supply power for the data collector; the sensor needs no power supply atordinary times, but when in need of a measurement, the data collector firstly supplies powder for the sensor and then a measurement command is issued for measuring, thus effectively reducing the power consumption. By the adoption of an MEMS device, two orthographic direction inclination angles can be simultaneously tested; in addition, the temperature compensation design of the transmission circuit board is carried out so as to eliminate the influence of temperature on measurement precision and enable the sensor to adapt to the influence of complex climatic conditions. Therefore, the sensor provided by the invention can be used to accomplish the automatic acquisition of tower inclination data.
Owner:STATE GRID ELECTRIC POWER RES INST +2
Integrated measurement system for indirectly measuring oil consumption of vehicular fuel oil
ActiveCN102778268ATimely supplementHigh measurement accuracyRelative volume flow measurementsLevel indicators by physical variable measurementCapacitanceFuel oil
The invention provides an integrated measurement system for indirectly measuring the oil consumption of vehicular fuel oil and aims at providing the integrated measurement system with the advantages of capabilities of continuously detecting and displaying remaining oil mass, a real-time oil consumption valve, total oil consumption and hundred-kilometer oil consumption rate of the vehicle and accuracy and reliability in measurement. The integrated measurement system disclosed by the invention is realized by the following technical scheme that an exciting source circuit of a signal conversion assembly (2) is used for preprocessing a current oil mass data signal acquired by a signal receiving assembly (3) through a computing center (4) and an oil mass sensor assembly (1) and then converting the received capacitance signal into a standard voltage signal or a current valve signal; the standard voltage signal or the current valve signal enters the computing center (4) through an input / output interface (5) and is sampled by an A / D (Analogue / Digital) converter in the computing center (4); meanwhile, an ECU (Electronic Control Unit) oil injection pulse signal is directly transmitted to a single chip microcomputer in the computing center; and the processed data are outputted to a display unit or uploaded to an upper computer by resolving program software.
Owner:四川泛华航空仪表电器有限公司
Device for measuring output displacement of magnetostrictive actuator
InactiveCN104776802AAvoid the impact of normal workRealize non-contact high-precision measurementUsing optical meansContact highMagnetostrictive actuator
The invention provides a device for measuring the output displacement of a magnetostrictive actuator. The device comprises a laser position adjusting device, a high-speed laser displacement sensor, a power supply, a digital display and the magnetostrictive actuator. The device for measuring the output displacement of the magnetostrictive actuator has the outstanding characteristics as follows: non-contact high-precision measurement of the output displacement of the magnetostrictive actuator can be realized; longitudinal positions of laser points emitted by the high-speed laser displacement sensor are adjusted precisely through adjustment of the longitudinal position of a longitudinal slider in the laser position adjusting device; horizontal positions of laser points emitted by the high-speed laser displacement sensor are adjusted precisely through adjustment of the horizontal position of a horizontal slider in the laser position adjusting device; influence of vibration generated in a displacement outputting process of the magnetostrictive actuator and vibration generated in the external environment on the measurement precision is eliminated effectively.
Owner:SHENYANG POLYTECHNIC UNIV
Comprehensive measuring system for directly measuring oil consumption of vehicle fuel
ActiveCN102778269ATimely supplementImprove stabilityRelative volume flow measurementsLevel indicators by physical variable measurementMicrocontrollerCapacitance
The invention provides a comprehensive measuring system for directly measuring the fuel oil quantity and oil consumption of vehicle fuel, and aims at providing the comprehensive measuring system with the advantages that the rest oil quantity, the real-time oil consumption value, the total oil consumption and the oil consumption rate per 100km of vehicles can be continuously detected and displayed, and the measurement of the fuel oil quantity and the oil consumption is precise and accurate. The comprehensive measuring system is realized through the technical scheme that an excitation source circuit of a signal conversion assembly (2) preprocesses the current oil quantity and consumption data signals collected by an oil quantity sensor assembly (1) and a consumption sensor assembly (11) through a calculation center (4) and a signal receiving assembly (3), received flow rate signals and capacitance signals are converted into standard voltage value signals or current value signals, then, the signals enter the calculation center (4) through an input and output interface (5), and the preprocessed signals are processed again, are sampled by an A / D (analog to digital) converter in the calculation center (4) and are then transmitted to a display unit or are uploaded to a host computer after being transmitted to a single chip microcomputer in the calculation center to be treated by calculation program software.
Owner:四川泛华航空仪表电器有限公司
Self-evaporator liquid level measuring device based on dual-pipe air blowing method
InactiveCN102538901AProven and reliable measuring principleLittle effect on measurement accuracyLevel indicators by pressure measurementEvaporatorEngineering
The invention discloses a self-evaporator liquid level measuring device based on a dual-pipe air blowing method. In the device, a first air blowing pipe (1), a second air blowing pipe (2) and a self-evaporator (9) are connected; the first air blowing pipe (1) and the second air blowing pipe (2) extend into the bottom of the self-evaporator (9); the height difference of the bottom ends of the first air blowing pipe (1) and the second air blowing pipe (2) is h2; a pipeline which is connected with the first air blowing pipe (1) is internally provided with a first air blower (3), a first separation tank (7) and a first differential pressure transmitter (5); a pipeline which is connected with the second air blowing pipe (2) is internally provided with a second air blower (4), a second separation tank (8) and a second differential pressure transmitter (6); and the first air blower (3), the second air blower (4) and an air source are connected. The self-evaporator liquid level measuring device provided by the invention is widely applied to an aluminum oxide plant, thus pollution is reduced effectively, the plant environment is protected, and better working environment is created for workers.
Owner:GUIYANG AL-MG DESIGN & RES INST
Differential confocal combination ultra-long focal length measuring method and apparatus
ActiveCN101403650BReduce measurementReduced impact of focal length measurement accuracyTesting optical propertiesPupilFocal position
Owner:BEIJING INSTITUTE OF TECHNOLOGYGY
Novel dynamometer
ActiveCN107192483ARapid cooling downEliminate the effects of measurement accuracyWork measurementTorque measurementCooling effectDynamometer
The invention discloses a novel dynamometer. The novel dynamometer comprises a front vertical plate, the rear side of which is provided with a rear vertical plate matched with the front vertical plate. The front vertical plate and the rear vertical plate are localized by positioning pins, and are connected together. An opening is formed between the front vertical plate and the rear vertical plate, and a brake is erected on the opening. The brake is erected between the front vertical plate and the rear vertical plate by a rotating shaft. The brake comprises a rotor disposed on the outer part of the rotating shaft in a sleeved way, and a stator matched with the rotor is disposed on the outer part of the rotor in a sleeved way. The front end of the rotor is fixedly provided with a rotor end cover. The rotor end cover is connected with a rotor cup, and the rotor cup is disposed on the outer part of the rotor. One end of the rotating shaft is extended out of the front vertical plate in a penetrating way, and the other end is disposed in the rear vertical plate. The end of the rotating shaft disposed in the rear vertical plate is connected with a code disc. The novel dynamometer is advantageous in that heat dissipation performance is better, and operation is more stable; during the operation of the dynamometer, hot air is led to the outside the first time, and a rapid cooling effect is achieved, and therefore the stable and normal operation of the dynamometer is guaranteed.
Owner:台州市光中电器制造有限公司
System for monitoring suspended solids in water in real time
InactiveCN103645162AHigh degree of intelligenceEliminate light intensity variationsTransmission systemsTransmissivity measurementsPhotovoltaic detectorsEquipment use
The invention discloses a system for monitoring suspended solids in water in real time. The system comprises a multi-beam suspended solid concentration monitor and terminal monitoring equipment used for receiving data, wherein the multi-beam suspended solid concentration monitor projects measured light to a water sample to be detected, detects the intensity of light transmitting the water sample to be detected and measures the concentration of the suspended solids in the detected water sample according to the intensity; the multi-beam suspended solid concentration monitor comprises a first light transmitter, a second light transmitter, a first photoelectric detector and a second photoelectric detector; the two light transmitter alternately transmit the measured light; when each light transmitter transmits the measured light, the two photoelectric detectors simultaneously detect the intensity of the light transmitting from the detected water sample and form a digital signal to enter a data processing center according to the intensity of the light detected by the photoelectric detectors; and the data processing center calculates the concentration of the suspended solids in the detected water sample according to the digital signal and transmits the concentration of the suspended solids to the terminal monitoring equipment through a third-generation (3G) communication module.
Owner:中山欧麦克仪器设备有限公司
Method for calibrating and compensating fine code error of encoding type sun sensor
ActiveCN104280048ASolve the problem of regular changes in measurement errorsEliminate the effects of measurement accuracyAngle measurementConstant errorSun sensor
Owner:BEIJING INST OF CONTROL ENG
Displacement measuring apparatus for concrete temperature-pressure tester and application thereof
InactiveCN1804544AEliminate errorsHigh measurement accuracyUsing optical meansMeasurement deviceEngineering
The invention relates to a shift measuring device of the concrete temperature-stress tester, which comprises two suits of same measuring sub system distributed on the two sides of the central axis of the concrete test unit (1), each sub system is formed by a laser shift sensor (5) and a carbon fiber rod (3) parallels to the central axis; one end of the carbon fiber rod is fixed on the main rim of the tester by fixed seat (2) and the other end fixes a laser shift sensor; the rod is supported by a plurality of guiding seats (4) of the main rim; the laser (7) sent by the laser shift sensor is parallel to the test central axis; the laser returns to when it sends to the measuring point (8) of the active end; the digital quantity is transmitted to the upper machine or the display unit to process by the digital interface (6).
Owner:WUHAN UNIV OF TECH
Coil with air core of forcipated duplex winding based on printed circuit board
InactiveCN1873859AHigh measurement accuracySmall footprintTransformersPrinted electric component incorporationPrinted circuit boardEngineering
Based on printed circuit board (PCB), coil with air core of forcipated duplex winding is composed of cascaded PCBs end to end. Length of each PCB is designed based on shape of conducting wire to be measured. Each PCB possesses same thickness and width. There are two parallel sets of electric distribution formed own loop symmetrical to up and down along midline on each PCB so as to structure two pieces of winding. Directions of two electric loops in up and down windings are opposite. Symmetric distribution of windings can reduce interference from external electromagnetic field effectively. Advantages are: flexible changeable form, small size, not necessary to disconnect conducting wire to be measured when installation, and suitable to conducting wire to be measured in irregular figure. Comparing with structure of current coil with air core. The invented coil possesses more even magnetic field, higher accuracy measured, and higher capability of anti electromagnetic interference.
Owner:武汉格蓝若光电互感器有限公司
Three axis optical fibre gyro system integrated mounting cage
InactiveCN101290226BReduce processing difficultyReduce processing costsSagnac effect gyrometersFiberAccelerometer
The invention relates to an integral mounting skeleton of a triaxial fiber optic gyro scope system. A plurality of groups of mounting holes are arranged on the mounting skeleton, each group of mounting holes are respectively used to install fiber optic gyro scopes, an accelerometer, a light source, a circuit board and a vibration damper. The fiber optic gyro scopes are three, form mutual space, and are orthogonally arranged on the outer surface of the mounting skeleton, the mounting skeleton adopts a hollow hexahedron frame structure, each group of mounting holes are symmetrically arranged, and mounting lug bosses are arranged on the positioning end surface of the mounting holes. An accelerometer hole is arranged in the mounting skeleton. The quality of the mounting skeleton is very small when enough rigidity and strength are guaranteed; the degree of deviation between the mass center of an inertia measuring unit and a geometric mounting center is very small; simultaneously the temperature compensation and the control scheme of each component of the inertia measuring unit are enabled to be executed; and the manufacturing cost is lowered.
Owner:BEIHANG UNIV
Capacitance voltage transformer stray capacitance calculation method
ActiveCN106249052AEliminate the effects of measurement accuracyKnow the sizeCapacitance measurementsCapacitive voltage dividerCapacitance coefficient
The invention discloses a capacitance voltage transformer stray capacitance calculation method. According to the method, a capacitive voltage divider is divided into a plurality of units; the potential coefficient matrix of the capacitive voltage divider is obtained by using a charge simulation method; and the inverse matrix of the potential coefficient matrix of the capacitive voltage divider is further calculated, so that the capacitance coefficient matrix of the capacitive voltage divider can be obtained; the stray capacitance to earth and stray capacitance to high-voltage end of the capacitive voltage divider at different heights can be obtained; and thus, the stray capacitance of the capacitive voltage divider can be known accurately, influence on the measurement accuracy of a capacitive voltage transformer which is caused by a condition that the stray capacitance of a capacitive voltage divider is adopted as a constant numerical value at present can be eliminated. The method has the advantages of simple principle and convenient calculation.
Owner:STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST +2
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