CN101446507A - USB2.0 multifunctional acoustic emission detection system - Google Patents
USB2.0 multifunctional acoustic emission detection system Download PDFInfo
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- CN101446507A CN101446507A CNA2008102137249A CN200810213724A CN101446507A CN 101446507 A CN101446507 A CN 101446507A CN A2008102137249 A CNA2008102137249 A CN A2008102137249A CN 200810213724 A CN200810213724 A CN 200810213724A CN 101446507 A CN101446507 A CN 101446507A
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Abstract
The invention discloses an acoustic emission detection system, consisting of a plurality of detection channels. The acoustic emission capture card is arranged in an independent case and then is connected to a computer. The case and the computer are mutually independent so as to lead the noise to be reduced; data transmission is realized by the connection of USB2.0, the maximum transmission rate can be 30MB/s so as to realize the real-time waveform acquisition and characteristic parameter extraction. The system is provided with a software analysis tool. The electricity is supplied by the case; the number of the channels can be extended to 112 channels; each channel consists of similar measuring components, a signal processing program and a calculating program and external components. The measuring components comprise a sensor, a preamplifier and an acquisition card. Each acquisition card has two channels, each channel has the precision of 16-bit; a 10MHzA/D converter and an analog filter which can be arranged by programmed controlling in 20K-1.2MHz are used as a digital acoustic waveform and a parameter data acquisition card; and the number of A/D trigger modes is five.
Description
Technical field
The present invention relates to fields such as petrochemical complex, electric power, civil engineering, Aero-Space, metal processing, material test, transaction transportation, particularly relate to a kind of acoustic emission detection system based on the USB2.0 technology.
Background technology
Acoustic emission and microseismic activity all are the spontaneous phenomenons that occurring in nature takes place at any time, when hear acoustic emission first although can't investigate people, are undoubtedly the acoustic emission signal that people hear the earliest by the fracture process as fracture branch, rock failure and fractured bone etc.Can infer very for certain " tin cry " be people's first observed to metal in acoustic emission phenomenon because pure tin mechanical Luan Jing remaining years can audible acoustic emission during plastic deformation, and the smelting of copper and tin can be traced to B.C. 3700.
The beginning of modern sound lift-off technology is a sign with German Kaiser research at beginning of the fifties metal, the acoustic emission phenomenon of alloy in deformation process, he has found the irreversible effect of material deformation acoustic emission, and in PhD dissertation, delivered its metal acoustic emission phenomenon research work, after this acoustic emission is developed rapidly.People observe acoustic emission phenomenon in machinery, physics, chemistry, bioprocess such as various material damage damage process, engineering structure carrying damage process, leakage process, shelf depreciation process, and use acoustic emission and detect and study.At the beginning of the sixties, people such as Green have begun the application of acoustic emission aspect the Non-Destructive Testing field.People such as Dunegan will test the scope that frequency is brought up to 100KHz～1MHz at the beginning of the seventies; The beginning of the eighties, computer technology was introduced acoustic emission detection system; Enter the nineties, companies such as Germany, Japan, the U.S. have developed the acoustic emission detection system that the computerize degree is higher, can carry out waveform acquisition and spectrum analysis.At present, people have been applied to acoustic emission many fields, as: metal constructions such as reinforced concretes such as pressure vessel, compound substance, aircaft configuration, high-power transformer shelf depreciation, bridge are stressed, the gib arm of crane are stressed, Control Welding Process, machine diagnostic, medical domain etc.
In a very long time, because restriction in microelectric technique, computer technology and signal processing technology, what most of acoustic emission researchs and application were adopted is to prolong the acoustic emission signal waveform characteristic parameter of having used decades, and the quantity of information that characteristic parameter comprises only accounts for the hundreds of of acoustic emission waveform quantity of information to several per milles.In order to make full use of information of acoustic emission signal, improve the ability of acoustic emission detection, people have carried out unremitting effort aspect collection of waveform acoustic emission signal and analytical technology, the acoustic emission waveform harvester that the various fexible units in the laboratory are pieced together develops into special-purpose waveform Acoustic radiating instrument.Document mention with market on the Acoustic radiating instrument that can see also fail to overcome well the transmit difficult problem of waveform acquisition storage and the information processing of magnanimity acoustic emission signal of real time high-speed multiple channel acousto at present.
Summary of the invention
The objective of the invention is the present situation at acoustic emission testing technology, the problem and the market demand of existence, propose acoustic emission detection system based on the USB2.0 technology.Be mainly used in and gather and analyze acoustic emission signal, improve the transmit ability of high speed acquisition storage and signal message processing of real-time multiple channel acousto that improved greatly, the volume that the has reduced system application that is easy to carry, the PC computer compatibility of USB2.0 interface and the convenience of external interface have overcome requirement restriction and the constraint of pci card acoustic emission system to the PC computer cabinet.
In order to achieve the above object, technical scheme of the present invention provides a kind of acoustic emission detection system, comprises USB2.0 acoustic emission box and controller, realizes the high-speed transfer of data by the USB2.0 communication modes.Realized full-automatic computer data processing.Described acoustic emission detection system also comprises: sensor, be installed on the determinand, and be used to collect the acoustic signals of determinand, and convert described acoustic signals to simulating signal; Amplifier is connected with described sensor, is used for described simulating signal and is enlarged into amplified analog signal; Analog-to-digital conversion module is connected with described amplifier, is used for described amplified analog signal is converted to digital signal; Primary processor is connected with described analog-to-digital conversion module, is used for described digital signal is carried out the processing of data and the transmission of order; Power module is connected with described primary processor, is used to described processor that power supply is provided.
Wherein, described system is inserted in the mainframe box by the capture card of 2 passages to be connected on the computing machine by USB again, so the user can select the quantity of computing machine and acquisition channel flexibly according to the needs of using.
Wherein, described sensor is the resonant mode high sensor.
Embodiment
Below in conjunction with accompanying drawing and example, the specific embodiment of the present invention is described in further detail.Following examples are used to illustrate the present invention, but are not used for limiting the scope of the invention.
Fig. 1 is a kind of acoustic emission detection system structural representation of the embodiment of the invention, Fig. 2 is the structural representation that the acoustic emission detection system among Fig. 1 is carried out further refinement, in conjunction with Fig. 1, Fig. 2, the acoustic emission detection system of present embodiment comprises: controller and acoustic emission detector, controller has been handled storage to the data of this system.Acoustic emission detector also comprises: the sensor that is used to detect, sensor successively with prime amplifier, filtering circuit, signal amplification circuit, analog-to-digital conversion module (ADC, Analog to Digital Converter) connects, analog-to-digital conversion module sends the digital signal that generates to FPGA (Field-Programmable GateArray, field programmable gate array), wherein, FPGA is connected with the RAM storer, be used to store data, also be used for data processing and external parameter and handle (temperature, pressure etc.); FPGA and CPU (CentralProcessing Unit, central processing unit) are connected with data bus by address bus; CPU is connected with the usb communication module, realizes the Wave data transmission storage that transmits of high speed data transfer, real time high-speed multiple channel acousto, has realized that full-automatic computer data handles; CPU selects module to be connected with filtering and selects high pass, low-pass filtering; CPU is connected with the emission high-pressure modular, is used for determining the existence and the location of sensor; Power module is connected with the FPGA module with CPU respectively, is used for powering.
Various piece to the acoustic emission detection system of present embodiment is described in detail below.
Sensor (being also referred to as probe) is to be voltage parameter with power, displacement or rate conversion, is made up of sensitive element, conversion element and change-over circuit.Being the pith of acoustic emission detection system, is the key factor that influences the entire system performance.The sensor type selecting is unreasonable, and the signal that receives and actual acoustic emission signal are had than big difference, directly influences the validity and the result of institute's image data.
Acoustic emission detection needs to adopt the sensor of different structure and performance according to different testing goals, different testing environments.In acoustic emission detection, the resonant mode high sensor is to use maximum a kind of.The selection of sensor should be determined according to tested acoustic emission signal.At first be frequency range and the amplitude range of understanding tested acoustic emission signal, comprise the noise signal that may exist, can understand by experience, the acoustic emission source experimental result that produces as weld defects in the steel shows signal frequency in 25KHz～750KHz etc., if but have ready conditions and preferably pass through practical measurement.Select then the acoustic emission signal sensitivity paid close attention to is detected the insensitive sensor of noise signal.According to the sensor that the feature and the detection order of detected object are selected corresponding frequencies, the response frequency that detects with sensor as metal pressure container is 100～400KHz, and the response frequency of leak detection sensor is 30～60KHz etc. at the bottom of pressure pipeline and the oil tank.
For sudden acoustic emission signal, calibrate AE sensor is selected the sensitivity that should consider the transient state surface wave for use, i.e. the incident angle surface wave parallel with the sensor sensing face, and the transducer sensitivity evaluation should be adopted the mode of voltage ratio speed.For successional acoustic emission signal, calibrate AE sensor select the sensitivity that should consider the incident angle plane wave vertical for use with the sensor sensing face, the transducer sensitivity evaluation should be adopted the mode of voltage ratio pressure.
Calibrate AE sensor belongs to receiving transducer, and sensitivity and working band are its leading indicators.We expect that calibrate AE sensor has high as far as possible sensitivity in working band, to pick up all acoustic emission signals.
The sensor that native system adopted is single-ended resonant transducer, and chief component is a piezoelectric chip, is single-ended receiving mode work, other end freedom.Sensor is formed part and is also had diaphragm, shell, contact conductor, combination hub, magnet in addition, and the electrode surface of piezoelectric element is sticked with glue on base; Another side welds out a very thin lead-in wire and is connected the earthing of casing with the heart yearn of high-frequency socket.
Prime amplifier, the signal voltage of sensor output is low to moderate the microvolt order of magnitude sometimes, faint like this signal, as if the transmission through long distance, signal to noise ratio (S/N ratio) must reduce.Prime amplifier is set near sensor, signal is brought up to a certain degree, commonly used have 34,40 and three kinds of 60dB, gives signal processing unit (capture card) through high frequency Tongzhou cable transmission again.Prime amplifier input be the simulating signal of sensor output, output be amplified analog signal, prime amplifier is a mimic channel, the working power of prime amplifier adopts power supply signal conllinear mode to carry.
In acoustic emission system, prime amplifier occupies an important position, about the performance of the noise of total system by prime amplifier.The effect in total system of prime amplifier will improve signal to noise ratio (S/N ratio) exactly, and high-gain and low noise performance be arranged.In addition, (frequency band is usually at 100KHz～1MHz) and in the environment of electrical noise carry out, and releases the ability that should have stronger antijamming capability and get rid of noise before therefore because acoustic emission detection is usually at stronger mechanical noise (frequency band is usually less than 50KHz), liquid noise.
Prime amplifier also can with the sensor of the band prime amplifier of being integral of sensor groups, be about to prime amplifier and insert in the sensor outer housing.
Amplifying circuit (amplification circuit) is exactly the electronic circuit that increases electrical signal amplitude or power.Use amplifying circuit and realize that the device that amplifies is called amplifier.Its core is the electronics active device, as electron tube, transistor etc.In order to realize amplifying, must provide energy to amplifier.The energy commonly used is direct supply, but the amplifier that has also utilizes high frequency electric source as pumping source.The essence of amplification is that the energy of power supply is transferred to output signal.The effect of input signal is this transfer of control, makes the variation repetition of amplifier output signal or the variation of reflected input signal.In the contemporary electronic systems, the generation of electric signal, transmission, reception, conversion and processing are nearly all based on amplifying circuit.20 beginnings of the century, the realization that the invention of vacuum triode and electric signal amplify indicates that electronics develops into a new stage.Late 1940s transistorized appearance, particularly the sixties integrated circuit appearance, quickened electron-amplifier so that electronic system miniaturization and microminiaturized process.The citation form of amplifying circuit has 3 kinds: common emitter amplifying circuit, common-base amplification circuit and common collector amplifying circuit.When constituting polystage amplifier, these several circuit usually need to be used in combination mutually.
It is modern that to use the widest be integrated amplifier based on transistor (bipolar transistor or field effect transistor) amplifying circuit.The low noise of high-power amplification and high frequency, microwave amplifies, discrete transistor amplifier commonly used.The vacuum tube of specific type is mainly leaned in the high-power amplification of high frequency and microwave, as pliotron or tetrode, magnetron, klystron, travelling-wave tube and crossed-field amplifier etc.
Filtering circuit is usually used in the ripple in the elimination rectifier output voltage, generally form by reactance component, as at pull-up resistor two ends shnt capacitor C, or with load series reactor L, and by electric capacity, inductance is formed the various compound filtering circuit that forms.
Because reactance component has the energy storage effect in circuit, when the voltage that capacitor C in parallel supplies with at power supply raises, can store portion of energy, and when supply voltage reduces, just energy is discharged, make load voltage smoother, promptly capacitor C has the effect of flat ripple; The inductance L of connecting with load, when the electric current of power supply supply increased (being caused by the supply voltage increase), it got up store energy, and when electric current reduces, again energy is discharged, and makes load current smoother, and promptly inductance L also has flat ripple effect.
The filtering circuit form is a lot, in order to grasp its analysis of law, it is divided into electric capacity input type (capacitor C is connected on the foremost) and inductance input type (inductor L is connected on the foremost).Preceding a kind of filtering circuit is used in the small-power power more, and then a kind of filtering circuit is used for than (and when electric current is very big, only connecting with load with an inductor) in the large power supply more.
Analog to digital converter is the system that analog signal conversion is become digital signal, is the process that a filtering, sampling keep and encode.Simulating signal is through the filtering of band limit, and sampling hold circuit becomes the stairstepping signal, by scrambler, makes that each level in the stepped signal becomes binary code then.
Simulating signal is successively by being converted to digital format behind sampling and maintenance (S/H) circuit and the analog to digital converter (A/D).Sampling and holding circuit are sampled to simulating signal with even interval, and keep sample value constant in time enough after each sampling computing, to guarantee that output valve can be by the A/D converter accurate transformation.Next step is will sample and the output of holding circuit is converted to digital form by analog to digital converter.The output of analog to digital converter is typically expressed as binary-coded form.Output is the sequence of " word ", a sample value of here each " word " expression sequence.The word length of analog to digital converter represents that with number of bits it has limited the dynamic range that converter can be realized (being interpreted as the precision of the input simulating signal that converter is represented).This conversion accuracy has resolution to characterize, and it is determined by discrete stages quantity.Such as, be the output of the word length of N position to a length with the binary mode coding, discrete stages quantity is 2 Nth power effectively, resolution is the inverse of dispersion number magnitude.
Primary processor is by CPU, CPLD or FPGA (Field Programmable Gate Array, field programmable gate array) or electron devices such as DSP (Digtal Signal Processor, digital signal processor) and storer and the software program that writes form.Primary processor is mainly adopted into the processing of data and the transmission of order.Such as sending the when instruction of acquired signal, send operational order, processing of signal data or the like.
FPGA is the abbreviation of English Field-Programmable Gate Array, i.e. field programmable gate array, and it is the product that further develops on the basis of programming devices such as PAL, GAL, CPLD.It occurs as a kind of semi-custom circuit in special IC (ASIC) field, has both solved the deficiency of custom circuit, has overcome the limited shortcoming of original programming device gate circuit number again.
FPGA has adopted the such new ideas of logical cell array LCA (Logic Cell Array), and inside comprises configurable logic blocks CLB (Configurable Logic Block), output load module IOB (Input Output Block) and three parts of interconnector (Interconnect).The basic characteristics of FPGA mainly contain:
1) adopt FPGA ASIC design circuit, the user does not need to throw sheet production, the just chip that can obtain share.
2) FPGA can do the middle coupons of other full customization or semi-custom ASIC circuit.
3) there are abundant trigger and I/O pin in FPGA inside.
4) FPGA is one of device that the design cycle is the shortest, development cost are minimum, risk is minimum in the ASIC circuit.
5) FPGA adopts high speed CHMOS technology, and is low in energy consumption, can with CMOS, Transistor-Transistor Logic level compatibility.
We can say that fpga chip is one of optimal selection of short run system raising level of integrated system, reliability.FPGA is provided with its duty by the program that leaves in the ram in slice, therefore, need the RAM in the sheet be programmed during work.The user can adopt different programming modes according to different configuration modes.When powering up, fpga chip reads in data among the EPROM among the RAM that programmes in the sheet, and after configuration was finished, FPGA entered duty.After the power down, FPGA reverts to white, and the internal logic relation disappears, and therefore, FPGA can use repeatedly.The programming of FPGA need not be special-purpose the FPGA programmable device, need only get final product with general EPROM, PROM programmable device.When needs are revised the FPGA function, only need change a slice EPROM and get final product.Like this, with a slice FPGA, different programming datas can produce different circuit functions.Therefore, the use of FPGA is very flexible.
RAM storer (Random-Access Memory, random access memory).In the composition structure of computing machine, a very part and parcel is arranged, be exactly storer.Storer is to be used for the parts of stored programme and data, for computing machine, storer has been arranged, and memory function is just arranged, and could guarantee operate as normal.
The usb communication module, USB is the abbreviation of English Universal Serial BUS, Chinese implication is " USB (universal serial bus) ".It is not a kind of new bus standard, but is applied in the interfacing in PC field.
The continuous data transfer rate that the USB2.0 communications protocol can provide 48MB/sec is used in this invention.This USB interface is used for connecting acoustic emission instrument and host computer, and the connection between a plurality of Acoustic radiating instrument.
Acoustic emission detection system of the invention process adopts acoustic method to detect, its principle is: the phenomenon of local source snap-out release energy generation transient state elastic wave is called acoustic emission (Acoustic Emission in the material, be called for short AE), be also referred to as the stress wave emission sometimes.Distortion and the crack propagation of material under stress is the important mechanisms of structural failure.This directly source relevant with distortion and fracture mechanism is called as acoustic emission source.
Acoustic emission source (defective) sends a kind of stress pulse ripple under external force is induced be acoustic emission signal.This stress pulse ripple is that acoustic emission signal is that mechanical vibration wave is propagated in the material of acoustic emission source place.When mechanical wave propagated into material surface, it was acoustic emission signal that calibrate AE sensor receives mechanical signal, and mechanical signal is converted to behind the electric signal delivered on the capture card after amplifying by the prime amplifier that is attached thereto, and capture card is converted into digital signal again.Characteristics of Acoustic Emission parameters such as (time of arrival), rise time, duration, peak amplitude, energy and bump counting all are to extract by the gate array able to programme on the capture card between moving into one's husband's household upon marriage for the first time in limited time, and waveform can be stored on the selectable instantaneous recording module.External parameter acquisition device obtains supplemental characteristics such as pressure, temperature and passes to control system by the capture card bus, all herein data are temporarily existed on the internal memory of controller after forming data set, and the control transformation by capture program becomes the acoustic emission file to deposit on the hard disc of computer again.Controller can the volatile storage from capture card reads the transient data file of Wave data to the hard disc of computer.
As can be seen from the above embodiments, the embodiment of the invention is the acoustic emission system that hyperchannel is made of a plurality of parallel sense channels based on the acoustic emission detection system of USB.Each passage all is by similar measurement component, signal digital handling procedure and calculation procedure, and promptly powerful computing machine is equipped with complete peripheral components again and forms.Each channel measurement parts of indication system comprise calibrate AE sensor, prime amplifier and capture card herein.Acoustic emission signal waveform and parameter signal can be gathered and show to this acoustic emission system in real time, thus can fully satisfy on-the-spot and breadboard various application requirements (the waveform acquisition analysis be the basis and or the parameter acquisition analysis be basic).Since can the whole acoustic emission original waveform data of acquisition and recording, the user can use various signal analysis and processing instruments as required and carry out the follow-up signal analysis of going deep into, and comprises definition acoustic emission parameter more targetedly etc.Certainly also can use instruments such as the incidental acoustic emission signal collection of SAEU2S acoustic emission system, analysis and demonstration comprehensively carries out more rational acoustic emission signal collection and processing to the waveform and the supplemental characteristic of signal.
This acoustic emission system is the USB acoustic emission system, adopts USB2.0 to realize high speed data transfer, has solved the real time high-speed multiple channel acousto Wave data transmission storage bottleneck problem that transmits substantially.Also realized full-automatic computer data processing, can make acoustic emission detection become intellectuality, visual detection method by testing results such as direct output mode signal of application demand and curved surface acoustic emission source location.This acoustic emission system can adopt different configurations according to the needs of actual detected, comprises the computing machine that uses different configurations, the mainframe box and the peripheral components thereof of different port numbers.The computing machine of different configurations refers to according to the practical application needs and selects suitable computer configuration for use, mainly comprises CPU, internal memory, hard disk, CD-ROM drive or the like; The mainframe box and the peripheral components thereof of different port numbers refer to the system of selecting different sizes according to the needs of practical application, promptly different port numbers.This system is inserted in the mainframe box by the SAEU2 capture card of 2 passages to be connected on the computing machine by USB again, so the user can select the quantity of computing machine and acquisition channel flexibly according to the needs of using.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the technology of the present invention principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (7)
1. an acoustic emission detection system is characterized in that, this system is the USB2.0 communication acoustic emission collector that is made of a plurality of parallel sense channels, the acoustic emission detection system that USB2.0 communication and computing machine and software are formed.Each passage of USB2.0 communication acoustic emission collector all is made up of similar electronic measuring part, signal digital handling procedure.The USB2.0 communication is made up of the USB2.0 interface on USB2.0 interface, USB2.0 cable and the computing machine of acoustic emission collector.Described acoustic emission detection system also comprises:
Sensor is installed on the object to be measured, is used to detect the acoustic signals of described object to be measured, and converts described acoustic signals to simulating signal;
Amplifier is connected with described sensor, is used for described simulating signal is enlarged into amplified analog signal;
Analog-to-digital conversion module is connected with described amplifier, is used for described amplified analog signal is converted to digital signal;
Primary processor is connected with described analog-to-digital conversion module, is used for described digital signal is carried out the processing of data and the transmission of order;
Power module is connected with described primary processor, is used to described processor that power supply is provided.
2. acoustic emission detection system as claimed in claim 1 is characterized in that, each channel measurement parts comprises calibrate AE sensor, prime amplifier and capture card.Acoustic emission signal waveform and parameter can be gathered and show to this emission coefficient in real time, thus can fully satisfy on-the-spot and breadboard various application requirements (the waveform acquisition analysis be the basis and or the parameter acquisition analysis be basic).Because can acquisition and recording acoustic emission original waveform data, the user can use various signal analysis and processing Software tools as required and carry out follow-up signal and analyse in depth, and comprises definition acoustic emission parameter more targetedly etc.Certainly also can use Software tools such as the incidental acoustic emission signal collection of this acoustic emission system, analysis and demonstration and comprehensively signal waveform and supplemental characteristic be carried out more rational acoustic emission signal collection and processing.
3. acoustic emission detection system as claimed in claim 2 is characterized in that, this acoustic emission system adopts the USB2.0 communication modes to realize data transmission, and its acoustic emission capture card is mounted in the special-purpose unique host case and is connected on the USB2.0 interface of computing machine.
4. acoustic emission detection system as claimed in claim 3 is characterized in that, the USB2.0 communication modes of this acoustic emission system also is used in the connection between several acoustic emission capture cards, makes this system expandability good, and maximum can be to 112 passages.
5. acoustic emission detection system as claimed in claim 4 is characterized in that, this system adopts the USB2.0 communications protocol that the continuous data effective transmission speed of maximum 30MB/s can be provided.
6. acoustic emission detection system as claimed in claim 5, it is characterized in that, this acoustic emission system is penetrated real-time acquisition software and is contained functions such as waveform parameter collection, auditory localization analysis, carries out real-time acoustic emission parameter, waveform acquisition and the input of outer parameter under the WindowsXP environment and gathers; Can realize that real-time waveform, parameter list, correlogram and positioning pattern show; Can carry out linearity, plane, cylinder, sphere, cube location and jar end three-dimensional localization, placement sensor automatically; The software interface design is succinct, easy to operate, has the setting of arbitrary parameter filtering window, cluster, location-parameter-signal processing functions such as waveform association analysis demonstration.
7. acoustic emission detection system as claimed in claim 6, it is characterized in that, this acoustic emission system ex-post analysis software can be selected for multiwindow, adopt modern wave analyzing devices such as FFT, small echo to carry out the waveform signal feature extraction, technology such as employing artificial neural network are carried out the waveform signal pattern-recognition.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104931073A (en) * | 2015-06-30 | 2015-09-23 | 奇瑞汽车股份有限公司 | Sensor based on signal adjusting circuit |
| CN105000032A (en) * | 2015-07-07 | 2015-10-28 | 北京康拓红外技术股份有限公司 | Digitization method for railway vehicle bearing acoustic detection system and implementation device for digitization method |
| CN106018107A (en) * | 2016-05-20 | 2016-10-12 | 重庆大学 | Method for testing three-dimensional ground stress by aid of acoustic emission processes |
| CN106053539A (en) * | 2016-06-17 | 2016-10-26 | 天津市龙网科技发展有限公司 | PH water quality analyzer system and control method thereof |
| CN107063583A (en) * | 2017-04-20 | 2017-08-18 | 北京声华兴业科技有限公司 | The acoustic emission detection system and method for a kind of valve leak |
| CN108566203A (en) * | 2018-04-20 | 2018-09-21 | 中国地震局工程力学研究所 | A kind of collecting method and device |
| CN109525258A (en) * | 2017-09-20 | 2019-03-26 | 费希尔控制国际公司 | The selectable acoustic emission device of bandwidth and method for delivery time average signal data |
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| CN110554096A (en) * | 2019-10-09 | 2019-12-10 | 中国工程物理研究院激光聚变研究中心 | Acoustic emission signal processing device and optical element damage detection system |
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| CN105000032A (en) * | 2015-07-07 | 2015-10-28 | 北京康拓红外技术股份有限公司 | Digitization method for railway vehicle bearing acoustic detection system and implementation device for digitization method |
| CN106018107A (en) * | 2016-05-20 | 2016-10-12 | 重庆大学 | Method for testing three-dimensional ground stress by aid of acoustic emission processes |
| CN106053539A (en) * | 2016-06-17 | 2016-10-26 | 天津市龙网科技发展有限公司 | PH water quality analyzer system and control method thereof |
| CN107063583A (en) * | 2017-04-20 | 2017-08-18 | 北京声华兴业科技有限公司 | The acoustic emission detection system and method for a kind of valve leak |
| CN109525258A (en) * | 2017-09-20 | 2019-03-26 | 费希尔控制国际公司 | The selectable acoustic emission device of bandwidth and method for delivery time average signal data |
| CN109525258B (en) * | 2017-09-20 | 2022-12-06 | 费希尔控制国际公司 | Acoustic emission device and method |
| CN108566203A (en) * | 2018-04-20 | 2018-09-21 | 中国地震局工程力学研究所 | A kind of collecting method and device |
| CN110118829A (en) * | 2019-06-27 | 2019-08-13 | 中国工程物理研究院化工材料研究所 | A kind of test macro and method of the amplitude-frequency characteristic of acoustic emission sensor |
| CN110554096A (en) * | 2019-10-09 | 2019-12-10 | 中国工程物理研究院激光聚变研究中心 | Acoustic emission signal processing device and optical element damage detection system |
| CN110579705A (en) * | 2019-10-21 | 2019-12-17 | 山东科技大学 | Relay performance analysis system based on acoustic emission |
| CN110579705B (en) * | 2019-10-21 | 2021-10-01 | 山东科技大学 | Relay performance analysis system based on acoustic emission |
| CN114354765A (en) * | 2021-12-02 | 2022-04-15 | 中国核电工程有限公司 | Single-channel acoustic emission signal acquisition device for nuclear power station |
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