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51results about How to "Applicable to online detection" patented technology
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Method for extracting fault characteristic frequencies of train rolling bearings with variable rotational speeds
ActiveCN104568444AIncrease flexibilityCancel noiseMachine bearings testingRolling-element bearingSignal on
The invention discloses a method for extracting fault characteristic frequencies of train rolling bearings with variable rotational speeds, and belongs to the field of technologies for diagnosing faults and processing signals. The method includes steps of analyzing vibration signals of the bearings with the variable rotational speeds in time and frequency domains, searching local peak values of the vibration signals and extracting instantaneous frequency values corresponding to the rotational speeds at different moments; fitting instantaneous frequencies by the aid of neural networks, acquiring rotational speed curves of reference spindles, re-sampling original signals at uniform angles on the basis of the rotational speed curves and analyzing order ratios of the original signals on the basis of the rotational speed curves; separating signals with mixed order ratio signals by the aid of fixed-point independent component analysis and spectrum peak search technologies to acquire order ratio component characteristics of fault components of the bearings. The method has the advantages that the method is used for estimating the rotational speeds of the train bearings without tachometers in real time, the instable fault bearing signals can be converted into the stable signals in uniform-angle domains, independent order ratio components can be effectively separated from the signals, and the method is favorable for extracting the fault characteristic frequencies of the train bearings and detecting the fault characteristic frequencies of the train bearings in an online manner.
Owner:BEIJING UNIV OF POSTS & TELECOMM
Fowl egg crack rapid on-line nondestructive detection device and method based on acoustic characteristic
InactiveCN101413928AQuality assuranceRealize automated detectionTesting eggsUltrasonic/sonic/infrasonic wave generationFowlAudio power amplifier
The invention discloses a device used for quick online nondestructive detection on cracks of poultry eggs on the basis of acoustic characteristic and a method thereof; the poultry egg is arranged on a supporting idler wheel; a stepping motor is connected with the supporting idler wheel and drives the supporting idler wheel; a microphone which is arranged beside the poultry egg is sequentially connected with a computer by a signal amplifier, a filter and an A / D converter; when the poultry egg rolls on a chain, different parts of the poultry egg are mechanically knocked at multi-point by a knocking rod; sound signals collected by the microphone are amplified by the signal amplifier, filtrated by the filter and converted by the A / D converter and subsequently input to the computer, thus comprehensively judging the cracking situation of the poultry eggs. The device and the method can adapt to poultry eggs with different types and different sizes, realize the classification and automatic detection of the poultry eggs during the production processing and circulation process, and can be popularized and applied to the nondestructive detection on the hardness and the maturity of agricultural products such as fruits, vegetables, and the like.
Owner:JIANGSU UNIV
On-line double-sided automatic thickness measuring device of organic glass
ActiveCN101806592APrevent the beam from shakingHigh precisionMeasurement devicesSpeed measurementMeasurement device
The invention relates to an on-line double-sided automatic thickness measuring device of organic glass, which mainly comprises a control system, a machine frame, a support frame, a detection frame, a cross beam, a cross beam regulator, a feeding distance measuring device and a plurality of thickness measuring devices, wherein the upper end of the machine frame is fixedly connected with the detection frame, the cross beam is connected onto the upper edge frame of the detection frame through the cross beam regulator, the inside of the detection frame is fixedly connected with the support frame, a plurality of support guide shafts are arranged on the support frame, a feeding speed measuring device is arranged at one end of any support guide shaft for measuring the feeding distance of an organic glass plate, the thickness measuring device comprises upper thickness measuring units and lower thickness measuring units, and a plurality of upper thickness measuring units and lower thickness measuring units are respectively and symmetrically arranged on the cross beam and the detection frame for detecting the thickness information of the front side and the back side of multi-point positions of the organic glass plate. Because the control system is used for processing and calculating the position information of entity space three-dimensional lattices of the organic glass in real time for confirming the dimension quality of the plates, the on-line double-sided automatic thickness measuring device has the advantage of simple and compact structure, and can be directly arranged at a production line for real-time measurement.
Owner:JIANGSU TOMSON NEW MATERIAL TECH CO LTD
Method for measuring fluidization parameter of gas-solid fluidized bed
InactiveCN102338732ARealize qualitative judgmentEasy to detectMaterial analysis by electric/magnetic meansFluid speed measurementGas solidMonitoring system
The invention discloses a method for measuring the fluidization parameter of a gas-solid fluidized bed. The method comprises the following steps of: 1) measuring an electrostatic signal in the gas-solid fluidized bed by use of an inductive electrostatic sensor, wherein the inductive electrostatic sensor is connected with a monitoring system; 2) analyzing the filtered electrostatic signal, and extracting the characteristic parameter; 3) associating the characteristic parameter of the electrostatic signal with the parameters such as particle concentration, speed, circulation time, particle clustering or flaking, fluidized state and the like, and establishing prediction models of the parameters respectively; and 4) detecting the parameters such as particle concentration, speed, circulation time, flaking / blocking and the like as well as the distribution and fluidized state thereof in the fluidized bed by use of the established prediction models. The method adopts a simple detection device, is safe and environmentally-friendly, has high accuracy, and is suitable for the online detection of the industrial production process.
Owner:ZHEJIANG UNIV
Steel plate automatic detection method and apparatus thereof based on electromagnetical ultrasonic SH wave technology
InactiveCN101393171ARealize detectionAdaptableAnalysing solids using sonic/ultrasonic/infrasonic wavesUltrasound attenuationSheet steel
The aim of the invention is to provide a flaw detection technology for carrying out comprehensive, rapid and automatic detection on a median plate or a thin plate by electromagnetic ultrasonic horizontal polarization shearing wave, a steel sheet automatic detection method for rapidly and effectively detecting various disadvantages through an electromagnetic ultrasonic SH wave technology and a device thereof. The device consists of an electromagnetic ultrasonic detection unit and a circuit system. The method adopts SH wave to detect the median plate and the thin plate, is sensitive to the disadvantages of the surface and the inside of the steel plate, receives a pure signal and can effectively detect various disadvantages of the steel plate. As the SH wave has small attenuation during transmission, the SH wave has long detection distance, can realize the comprehensive detection of the steel plate with fewer probes and greatly improve the detection efficiency. The method combines an ultrasonic transmission method and a reflection method, can detect various disadvantages of the steel plate, can judge the shapes and positions of the disadvantages, and has high confidence level of a detection result.
Owner:HARBIN INST OF TECH
On line foreign matter distinguishing method for article inspection based on unit gradation uniformity
InactiveCN1653975AApplicable to online detectionReduce the recognition rateCigarette manufactureForeign matterComputer science
The on-line foreign matter detecting process based on unit grey homogeneity includes the following steps: 1) image taking; 2) image transmission: 3) foreign matter distinguishing and processing; 4) distinguishing signal transmission; and 5) eliminating foreign matter. During the process, LED is used as light source to raise image brightness and stability, images are taken from both the upper side and the lower side of the detected matter, and the detected matter is distinguished from two sides for raised distinction rate. In the foreign matter distinguishing and processing, the integral unit gray homogeneity is utilized in judging the unit attribute to distinguish the foreign matter with color similar to that of the detected matter. The present invention has raised distinguishing rate between tobacco or other detected matter and foreign matter.
Owner:CHONGQING UNIV
Method for detecting adhesiveness of film based on surface wave
InactiveCN102305777AApplicable to online detectionAnalysis by material excitationPhysicsSurface wave
The invention belongs to the technical field of film nondestructive detection, and relates to a method for detecting the adhesiveness of a film based on a surface wave. The method comprises the following steps of: constructing a spring hypothetical model representing the adhesive characteristic of a film; establishing a particle displacement expression of the surface wave; substituting a boundary condition of the surface wave spread in a film / base structure into the surface wave particle displacement expression so as to obtain an equation group composed of 6 equations, namely B6*6C6*1=0; causing determinant of a coefficient matrix B6*6 to be zero, and taking KN and KT as parameters influencing a chromatic dispersion curve, so as to obtain the chromatic dispersion curve of the surface wave; exciting the surface wave on the surface of a sample sheet to be detected; collecting surface wave signals from two different positions close to the surface of the sample sheet to be detected; analyzing and processing the surface wave signals, so as to obtain an experimental chromatic dispersion curve of the surface wave; matching the curve with the obtained surface wave dispersion curve, so as to obtain a normal elastic coefficient KN on the surface of the sample sheet to be detected; and determining the adhesiveness between the thin film and the base according to the KN. The detection method provided by the invention can be used for fast and accurately detecting the adhesiveness between the film and the base without loss.
Owner:TIANJIN UNIV
Detection method for transmission flow pattern during pneumatic transmission process
ActiveCN109283255AApplicable to online detectionImprove detection accuracyMaterial analysis using acoustic emission techniquesProcessing detected response signalSensor arrayMultiple sensor
The invention discloses a detection method for the transmission flow pattern during a pneumatic transmission process. The transmission flow pattern of a material in a pipeline is accurately recognizedby means of a sound wave signal generated by collisions of fluid particles and friction with a pipeline wall in a noninvasive collection pipeline. The sound wave detection belongs to a noninvasive detection method, wherein a detection device is simple, safe and environment-friendly, so that the detection method is suitable for online detection during industrial production. By means of a sound wave sensor array, the flow pattern is determined accurately by effectively utilizing the characteristic relationship between the flow pattern and particle concentration distribution through data fusionof the sensors, so that the method, compared with a flow pattern detection technology in the prior art, is more sensitive and accurate and is easy to carry out.
Owner:ZHEJIANG UNIV
Method and system for detecting mass flow rate of particles in pneumatic conveying process
ActiveCN111351540AIncrease credibilityImprove detectabilityIndirect mass flowmetersParticle flowEngineering
The invention discloses a method and a system for detecting the mass flow rate of particles in a pneumatic conveying process, and the mass flow rate of materials conveyed in a pipeline is accurately detected through a series of treatment by collecting sound wave signals generated by the action of fluid particles in the pipeline and the wall surface of the pipeline in a non-invasive manner. The sound wave detection adopted by the invention is a non-invasive detection method, and the detection device is simple, safe, environment-friendly and suitable for online detection in the industrial production process. By adopting an acoustic sensor array, through data fusion of multiple sensors, particle flow forms, concentrations and speed distribution under different conveying flow patterns can be effectively associated with the conveying mass flow rate, so that the mass flow rate of conveyed particles can be accurately detected under different conveying conditions (different conveying flow patterns, different conveying pipelines and different conveying materials). Compared with an existing mass flow rate detection technology, the method is more sensitive, accurate and wider in application range.
Owner:ZHEJIANG UNIV
Integrated chip crack detection device and method
PendingCN107796827AImprove reliabilityImprove securityOptically investigating flaws/contaminationSemiconductor chipHeat control
The invention discloses an integrated chip crack detection device and method. The device comprises a control unit, a sensing unit and an excitation unit which are mutually connected, wherein under control of the control unit, the excitation unit can generate a linear laser beam; the linear laser beam irradiates to the surface of a semiconductor chip to perform horizontal and longitudinal scan on the surface of the semiconductor chip; meanwhile, the linear laser beam can generate thermal wave at the position a required excitation line, thermal reaction of the thermal wave is caught by the sensing unit, and thermal reaction data is transmitted to the control unit. The integrated chip crack detection device disclosed by the invention achieves non-contact, no-damage and non-invasion detectionrecognition on cracks of the surface of an integrated chip, is not limited by chip materials, has a high detection efficiency, is suitable for online detection and further improves crack detection capacity and reliability and safety of the integrated chip.
Owner:HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
Method for calculating pose of thread-containing target object based on point cloud data
ActiveCN109631847AApplicable to online detectionPhotogrammetry/videogrammetryPoint cloudObject based
The invention provides a method for calculating a pose of a thread-containing target object based on point cloud data. Th method comprises the following steps that 1) the plane where the thread-containing target object intersects with the other object when fixing is recorded as a first plane, and point cloud data are acquired; and a plane equation of the first plane is fitted to obtain a normal vector; 2) a plurality of plane Ci perpendicular to the first plane is made, the thread point cloud data falling on the same plane Ci are selected as a straight line fitting to obtain a straight line Li; 3) a plurality of parallel plane Pj of the first plane is made in the thread point cloud data distribution area; 4) the intersection point of the straight line Li and the plane Pj is selected, a point fitting ellipse in the same plane is used for obtaining center point coordinates; and 5) carrying out linear fitting on the coordinates of a plurality of center points, then the included angle between the axis L and the specific plane is obtained, and the included angle between the thread-containing target object and the specific plane is obtained. According to the method, the pose data of thethread-containing target object can be calculated after the point cloud data of the thread-contained target object is obtained, the method is accurate and practical, and is suitable for on-line detecting.
Owner:ISVISION (TIANJIN) TECH CO LTD
Printing paper air-suction flattening device
ActiveCN103342249AAvoid Image DistortionTo ensure the flattened effectArticle deliveryPaper sheetMechanical construction
The invention discloses a printing paper air-suction flattening device. The printing paper air-suction flattening device comprises an air-suction plate and an air-suction fan set. The air-suction plate is arranged on the periphery of a paper conveying roller, and one face, corresponding to the paper conveying roller, of the air-suction plate is an arc face matched with the paper conveying roller. A gap which allows paper to pass through is reserved between the air-suction plate and the paper conveying roller. The air-suction fan set is composed of a plurality of air-suction fans which are arranged on the backside of the air-suction plate. Air-suction holes which correspond to the air-suction fans are formed in the arc surface of the air-suction plate. Compared with the prior art, the printing paper air-suction flattening device does not need to make simultaneous contact with the two sides of the paper, guarantees that the quality of the printing paper is not influenced, and is suitable for online inspection; in addition, the printing paper air-suction flattening device is provided with a unique mechanical structure, flattens the printing paper before an inspection point, enables the paper to fit in with an ideal path line all the time when the paper passes through the inspection point and avoids deformation of an image. Meanwhile, a paper strip upper supporting device and a paper strip lower supporting device ensure that a printing product moves according to a path of a chain way in other areas besides the air-suction plate, and therefore the effect of flattening of the printing paper is further ensured.
Owner:CHENGDU BANKNOTE PRINTING +1
Fault branch identification method and apparatus for multi-terminal DC line protection
ActiveCN103825257ASimple structureReduce investmentEmergency protective circuit arrangementsElectric power transfer ac networkEngineeringTime difference
The invention relates to a fault branch identification method and apparatus for multi-terminal DC line protection. The method is characterized by comprising the following steps: arranging a multi-terminal DC system model, forming T connection points of multi-terminal DC lines, arranging switching stations at the T connection points or combining with corresponding converter stations and arranging the switching stations, and forming a plurality of multi-terminal DC branches by taking the T connection points as fulcrums; arranging AC circuit breakers or fast DC switches in the switching stations; and arranging a reference synchronous clock, and the reference synchronous clock selecting a GPS or a Beidou for synchronous time setting; detecting fault raveling waves received by each converter station, by taking the time differences of the fault raveling waves received by the converter stations, constructing a characteristic function, calculating the characteristic values of the function, comparing the characteristic values with zero, and determining the generation branches of the fault traveling waves. According to the invention, the time differences of the fault raveling waves are received through the converter stations, and the transmission distance relations of the fault raveling waves are calculated for determining the generation branches of faults, such that the line structure is simplified, the faults can be determined and handled through calculation, and the action speed is rapid.
Owner:CHINA ENERGY ENG GRP GUANGDONG ELECTRIC POWER DESIGN INST CO LTD
Fast detection method for soluble COD in polyether production waste water
InactiveCN109696410ASave time and costLow costColor/spectral properties measurementsChemistryFingerprint
The invention relates to a fast detection method for soluble COD in polyether production waste water. According to the invention, ultraviolet spectrum fingerprint characteristics of polyether waste water are analyzed, the characteristic spectrum of polyether is found out by combining statistical analysis, and a linear relationship is established with the soluble COD. The fast detection method realizes fast detection for the soluble COD in the polyether waste water. Compared with the conventional COD detection method, the fast detection method can greatly reduce the time cost of COD detection.Meanwhile, the fast detection method can greatly save the cost of COD testing agents, can eliminate the environmental pollution caused by COD detection, and has extremely high economic and environmental benefits.
Owner:TIANJIN CHENGJIAN UNIV
Method for calculating the pose of a threaded target object based on point cloud data
ActiveCN109615657AApplicable to online detectionImage enhancementImage analysisObject basedPoint cloud
The invention discloses a method for calculating the pose of a threaded target based on point cloud data, and the method comprises the following steps: 1) recording a plane where the threaded target intersects with other objects when the threaded target is fixed as a first plane, and obtaining the point cloud data; Fitting a plane equation of the first plane to obtain a normal vector; 2) carryingout cylinder fitting by utilizing the point cloud data of the thread covering part to obtain an axis Lc of the cylinder; 3) respectively calculating the distance from each point in the point cloud data of the thread covering part to the axis Lc; screening data, and recording the data as a data packet I; 4) performing cylinder fitting by using data in the data packet I to obtain an axis L'of the data packet I, and 5) calculating an included angle between the axis L 'and a specific plane, i.e., the included angle between the threaded target and the specific plane. The method can calculate the pose data of the threaded target after acquiring the point cloud data of the threaded target, and is accurate, real-time and suitable for online detection.
Owner:ISVISION (TIANJIN) TECH CO LTD
Optical scanning outside diameter measuring system without scanning objective lens and its measuring method
InactiveCN1529121AAvoid difficultiesEasy to debugUsing optical meansConverting sensor output electrically/magneticallyGravity centerOptoelectronics
The invention is a kind of optical scanning external diameter measuring system which hasn't the scanning object lens and the measuring method. The system is made up of two or more optical scanning units without scanning object lens, each unit is assembled with any angle, each unit is made up by connecting light source, collimating mirror, scanning rotary mirror, the receiving object lens, photoelectric receiver. The photoelectric receiver connects with computer through wires. The method uses any two units as a group, the distance between the scanning mirror and the reflection centre point is l0, the offset centre angle to light of the measured object are 2theta 1 and 2 theta 2, the line between the object gravity center and the scanning mirror reflection centre point are alpha 1, alpha 2, the diameter is d: d= dkl0 according to following method, k= 1 / (cos alpha 1 / sin theta 1 + cos alpha 2 / sin theta 2). The invention has no object lens, the producing is easy, it realiezes the computer digit compensate for system difference, the stability is good, it has high reliability, the assemble and maintaining is easy, the cost is low.
Owner:SOUTH CHINA UNIV OF TECH
Data acquisition device in surge protection device
ActiveCN104793092AHighlight substantive featuresAutomatic assessment of agingElectrical testingEmergency protective arrangements for limiting excess voltage/currentMicrocontrollerData acquisition
The invention belongs to a data acquisition device in an urge protection device and relates to an emergent protection circuit device for limiting over-current or over-voltage so that a circuit is not switched off. The data acquisition device comprises a data acquisition circuit part, a data buffering circuit part, a single chip microcomputer and a service life display circuit part, wherein the data acquisition circuit part mainly comprises an interface inserting needle, a chip AD8138 and a chip AD9238; the data buffering circuit part mainly comprises an FIFO (First-In First-Out) register and two latches; the service life display circuit part mainly comprises a light emitting diode and a resistor; and a service life display program and a data acquisition processing program are stored in the single chip microcomputer. By virtue of the device, the problem that the data acquisition device and an online monitoring device, which specially aim at an SPD, are lacked in the prior art is solved; and meanwhile, the defect that the cost of control chips taking a digital signal processor (DSP) and a field programmable gate array (FPGA) as cores is relatively high is overcome.
Owner:HEBEI UNIV OF TECH
Novel testing method of carbon-containing organic substance
InactiveCN103376302AHigh sensitivityLow detection limitChemical analysis using catalysisAnalysis toolsOrganic matter
The invention discloses a novel testing method of carbon-containing organic substance. The method is based on the TOC (Total Organic Carbon) testing technology, a TOC tester is used as an analysis tool, and test on mass concentration of the organic substance is realized according to the TOC content in water solution and the fixed carbon percentage in the organic substance. The novel testing method is free from any sample pretreatment, is quick in test, high in sensitivity, wide in application range and high in testing accuracy, thereby being very suitable for on-site online monitoring.
Owner:CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
Fowl egg crack rapid on-line nondestructive detection device and method based on acoustic characteristic
InactiveCN101413928BQuality assuranceRealize automated detectionTesting eggsUltrasonic/sonic/infrasonic wave generationFowlAudio power amplifier
The invention discloses a device used for quick online nondestructive detection on cracks of poultry eggs on the basis of acoustic characteristic and a method thereof; the poultry egg is arranged on a supporting idler wheel; a stepping motor is connected with the supporting idler wheel and drives the supporting idler wheel; a microphone which is arranged beside the poultry egg is sequentially connected with a computer by a signal amplifier, a filter and an A / D converter; when the poultry egg rolls on a chain, different parts of the poultry egg are mechanically knocked at multi-point by a knocking rod; sound signals collected by the microphone are amplified by the signal amplifier, filtrated by the filter and converted by the A / D converter and subsequently input to the computer, thus comprehensively judging the cracking situation of the poultry eggs. The device and the method can adapt to poultry eggs with different types and different sizes, realize the classification and automatic detection of the poultry eggs during the production processing and circulation process, and can be popularized and applied to the nondestructive detection on the hardness and the maturity of agricultural products such as fruits, vegetables, and the like.
Owner:JIANGSU UNIV
Fast detection method for soluble COD in purified terephthalic acid production waste water
InactiveCN109696411AQuick checkReduce inspection time costsColor/spectral properties measurementsSolubilityStatistical analysis
The invention relates to a fast detection method for soluble COD in purified terephthalic acid production waste water. According to the invention, ultraviolet spectrum fingerprint characteristics of the PTA waste water are analyzed, the characteristic spectrum of PTA is found out by combining statistical analysis, and a linear relationship is established with the soluble COD. The fast detection method realizes fast detection for the soluble COD in the PTA waste water. Compared with the conventional COD detection method, the fast detection method can greatly reduce the time cost of COD detection. Meanwhile, the fast detection method can greatly save the cost of COD testing agents, can eliminate the environmental pollution caused by COD detection, and has extremely high economic and environmental benefits.
Owner:TIANJIN CHENGJIAN UNIV
Torque detection table
InactiveCN110389033AEasy to operateSimple structureMachine gearing/transmission testingMeasurement of force applied to control membersEngineeringControl theory
The invention discloses a torque detection table. The torque detection table comprises a box body, wherein a top plate of the box body is a guide plate, one of side plates is an installation plate, atorque and rotational speed sensor is fixedly arranged at an inner side of the installation plate, an input shaft of the torque and rotational speed sensor is connected with a guide shaft by a coupler, the guide shaft upwards penetrates out of a penetrating hole in the guide plate and is connected with an output end of a to-be-detected product, a gear fixedly sleeves an output shaft of the torqueand rotational speed sensor, a guide rail is arranged at an inner side of the installation plate, a rack is arranged in a guide groove in an inner side of the guide rail in a sliding way and is engaged with the gear, a threaded hole is formed in one of baffle plates, an adjustment bolt is arranged in the threaded hole of the baffle plate, the other end of the adjustment bolt is arranged in the guide groove, a compression spring sleeves the other end of the adjustment bolt, a working end of the compression spring props against the rack, and the adjustment of a pre-tightening force of the compression spring is achieved by rotating the adjustment bolt. Compared with the prior art, the torque detection table has the following advantages that batch and on-line detection on torque of parts in mass production is achieved.
Owner:六安永达机械股份有限公司
Residue detection method of sodium tetradecyl sulfate
InactiveCN107478705AHigh sensitivityLow detection limitMaterial analysis by electric/magnetic meansCleaning validationTest sample
The invention discloses a residue detection method of sodium tetradecyl sulfate. The method comprises the following steps: (1) preparation of a to-be-tested sample: sampling from cleaned equipment in contact with the sodium tetradecyl sulfate, so as to prepare the to-be-tested sample; (2) detection of the sample: detecting the to-be-tested sample obtained in step (1) with a TOC (total organic carbon) determination method. The detection method disclosed by the invention is fast and convenient, the analytical testing time and the waiting time of production are shortened, and the detection method also has the important significance in the maintenance aspect of a cleaning validation state.
Owner:SPH NO 1 BIOCHEM & PHARMA CO LTD
Rolling type online egg crack detecting device on basis of parallel piezoelectric film arrays
ActiveCN105651609ARealize online detectionSimple organizationMaterial strength using tensile/compressive forcesUsing mechanical meansElectricitySignal conditioning circuits
The invention discloses a rolling type online egg crack detecting device on the basis of parallel piezoelectric film arrays. The rolling type online egg crack detecting device is characterized in that egg pushing mechanisms are equidistantly arranged on a conveying chain, and eggs are clamped between the adjacent egg pushing mechanisms; two egg tracks which are parallel to the conveying chain are symmetrically arranged on two sides of the conveying chain and sequentially include a front-end track, a detection track and a rear-end track along the conveying direction, and the N parallel piezoelectric film arrays which are uniformly arrayed along the conveying direction are mounted on the detection track and pass a signal conditioning circuit and a data acquiring and processing system. The rolling type online egg crack detecting device has the advantages that egg crack can be detected in an online manner, signal excitation devices can be simplified, multiple points on the surfaces of the eggs can be continuously detected, the problem of misjudgment or missing detection or the like due to the fact that signal difference is caused by difference of knocking force and crack is not knocked can be solved, and the detection rate can be increased.
Owner:ZHEJIANG UNIV
Switch cabinet partial discharge on-line monitoring system based on FPGA module
InactiveCN111190083AApplicable to online detectionReduce noiseTesting using acoustic measurementsHemt circuitsMonitoring system
The invention discloses a switch cabinet partial discharge on-line monitoring system based on an FPGA module, and belongs to the technical field of partial discharge detection system application. Thesystem comprises a partial discharge detector, an ultrasonic sensor, a planar equiangular spiral antenna, a hardware circuit, an upper computer, an FPGA module and an I / O serial port. The FPGA moduleis respectively connected to a power supply module, the ultrasonic sensor, the planar equiangular spiral antenna and an ultrahigh frequency signal detection and hardware circuit, and is connected to the upper computer through an I / O serial port of the FPGA module, and the components are placed in the switch cabinet to monitor the discharge condition of each point on the switch cabinet in real time. The system can detect the specific position of discharge through ultrasonic waves and judge the intensity of discharge according to different phase-amplitude values, and protection is made as soon as possible.
Owner:SHENYANG AEROSPACE UNIVERSITY
A method and system for detecting particle mass flow rate during pneumatic conveying
ActiveCN111351540BApplicable to online detectionImprove detection accuracyIndirect mass flowmetersParticle flowMultiple sensor
The invention discloses a method and a system for detecting the mass flow rate of particles in a pneumatic conveying process, and the mass flow rate of materials conveyed in a pipeline is accurately detected through a series of treatment by collecting sound wave signals generated by the action of fluid particles in the pipeline and the wall surface of the pipeline in a non-invasive manner. The sound wave detection adopted by the invention is a non-invasive detection method, and the detection device is simple, safe, environment-friendly and suitable for online detection in the industrial production process. By adopting an acoustic sensor array, through data fusion of multiple sensors, particle flow forms, concentrations and speed distribution under different conveying flow patterns can be effectively associated with the conveying mass flow rate, so that the mass flow rate of conveyed particles can be accurately detected under different conveying conditions (different conveying flow patterns, different conveying pipelines and different conveying materials). Compared with an existing mass flow rate detection technology, the method is more sensitive, accurate and wider in application range.
Owner:ZHEJIANG UNIV
Optical scanning outside diameter measuring system without scanning objective lens and measuring method thereof
InactiveCN100480624CImprove consistencyEasy to adjustUsing optical meansConverting sensor output electrically/magneticallyGravity centerOptoelectronics
The invention is a kind of optical scanning external diameter measuring system which hasn't the scanning object lens and the measuring method. The system is made up of two or more optical scanning units without scanning object lens, each unit is assembled with any angle, each unit is made up by connecting light source, collimating mirror, scanning rotary mirror, the receiving object lens, photoelectric receiver. The photoelectric receiver connects with computer through wires. The method uses any two units as a group, the distance between the scanning mirror and the reflection centre point is l0, the offset centre angle to light of the measured object are 2theta 1 and 2 theta 2, the line between the object gravity center and the scanning mirror reflection centre point are alpha 1, alpha 2, the diameter is d: d= dkl0 according to following method, k= 1 / (cos alpha 1 / sin theta 1 + cos alpha 2 / sin theta 2). The invention has no object lens, the producing is easy, it realiezes the computer digit compensate for system difference, the stability is good, it has high reliability, the assemble and maintaining is easy, the cost is low.
Owner:SOUTH CHINA UNIV OF TECH
On-line double-sided automatic thickness measuring device of organic glass
ActiveCN101806592BImprove rigidityHigh positioning accuracyMeasurement devicesControl systemEngineering
Owner:JIANGSU TOMSON NEW MATERIAL TECH CO LTD
Steel plate automatic detection method and apparatus thereof based on electromagnetical ultrasonic SH wave technology
InactiveCN101393171BRealize detectionAdaptableAnalysing solids using sonic/ultrasonic/infrasonic wavesUltrasound attenuationSheet steel
The aim of the invention is to provide a flaw detection technology for carrying out comprehensive, rapid and automatic detection on a median plate or a thin plate by electromagnetic ultrasonic horizontal polarization shearing wave, a steel sheet automatic detection method for rapidly and effectively detecting various disadvantages through an electromagnetic ultrasonic SH wave technology and a device thereof. The device consists of an electromagnetic ultrasonic detection unit and a circuit system. The method adopts SH wave to detect the median plate and the thin plate, is sensitive to the disadvantages of the surface and the inside of the steel plate, receives a pure signal and can effectively detect various disadvantages of the steel plate. As the SH wave has small attenuation during transmission, the SH wave has long detection distance, can realize the comprehensive detection of the steel plate with fewer probes and greatly improve the detection efficiency. The method combines an ultrasonic transmission method and a reflection method, can detect various disadvantages of the steel plate, can judge the shapes and positions of the disadvantages, and has high confidence level of a detection result.
Owner:HARBIN INST OF TECH
Method for measuring fluidization parameter of gas-solid fluidized bed
InactiveCN102338732BEasy to detectImprove detection accuracyMaterial analysis by electric/magnetic meansFluid speed measurementGas solidMonitoring system
The invention discloses a method for measuring the fluidization parameter of a gas-solid fluidized bed. The method comprises the following steps of: 1) measuring an electrostatic signal in the gas-solid fluidized bed by use of an inductive electrostatic sensor, wherein the inductive electrostatic sensor is connected with a monitoring system; 2) analyzing the filtered electrostatic signal, and extracting the characteristic parameter; 3) associating the characteristic parameter of the electrostatic signal with the parameters such as particle concentration, speed, circulation time, particle clustering or flaking, fluidized state and the like, and establishing prediction models of the parameters respectively; and 4) detecting the parameters such as particle concentration, speed, circulation time, flaking / blocking and the like as well as the distribution and fluidized state thereof in the fluidized bed by use of the established prediction models. The method adopts a simple detection device, is safe and environmentally-friendly, has high accuracy, and is suitable for the online detection of the industrial production process.
Owner:ZHEJIANG UNIV
Surface shape detection apparatus and method for large-bore plane optical element
InactiveCN101476880BEffective deduction errorEffective deduction effectUsing optical meansClassical mechanicsMovement control
The invention relates to a device and a method for detecting the surface shape of large-caliber plane optical elements, and belongs to a device and a method for detecting the quality of optical elements. The device and the method aim to solve the problems in the prior device and the prior method for detecting the large-caliber plane optical elements. The device comprises a stand, an image acquisition and processing system and a three-dimensional precision motion control system, wherein the three-dimensional precision motion control system comprises a vertical motion guide rail which is rotatably arranged on the stand, and a horizontal motion guide rail which can slide on the vertical motion guide rail; a rotary shaft which is fixed on the vertical motion guide rail is connected with a rotary power mechanism; and the image acquisition and processing system comprises a first scanning penta prism which is arranged on a slider of the horizontal motion guide rail, a first reference penta prism and a second scanning penta prism which are coaxially fixed with the horizontal motion guide rail, a second reference penta prism which is coaxially fixed with the vertical motion guide rail, andan optical head which is coaxially fixed with the horizontal motion guide rail. The device and the method can be applied to detection of the large-caliber plane optical elements, and are particularlysuitable for online detection.
Owner:范勇
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