CN201796014U - Metal material analyzer - Google Patents
Metal material analyzer Download PDFInfo
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- CN201796014U CN201796014U CN2010205296841U CN201020529684U CN201796014U CN 201796014 U CN201796014 U CN 201796014U CN 2010205296841 U CN2010205296841 U CN 2010205296841U CN 201020529684 U CN201020529684 U CN 201020529684U CN 201796014 U CN201796014 U CN 201796014U
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Abstract
The utility model discloses a metal material analyzer and is designed to solve the problems of the prior art, such as complex measurement and high cost. The metal material analyzer comprises an electric vortex sensor, a detection circuit, a digital processing circuit, a single chip microcomputer, a memory unit, a display device and a control device. The structure is characterized in that a standard signal collected by the metal standard part is stored in the memory unit. During measurement, the high-frequency reflection-type electric vortex sensor collects the information of a test piece, the collected signal is transmitted to the detection circuit and converted into the effective electrical signal by the detection circuit, the electrical signal is amplified and then transmitted to the digital processing circuit, the digital processing circuit converts the analog output from the detection circuit into the effective digital signal that is transmitted to the single chip microcomputer, and the single chip microcomputer receives the effective digital signal from the digital processing circuit and then compares the effective digital signal with the standard signal and transmits the comparison result to the display device on which the result is displayed. The metal material analyzer has the advantages of low cost, simple structure, high sensitivity and strong applicability.
Description
Technical field
The utility model relates to a kind of surveying instrument, in particular for the analyser of measuring metallic materials.
Background technology
China is a manufacturing powerhouse, and the kind of using and using of metal material is very extensive, determines the performance and the kind of metal material, will be necessary to manufacturing industry.At present domestic in the mode that still adopts traditional spectral analysis aspect the metal material performance evaluation, cost an arm and a leg, the analytic process complexity, only use is just arranged in the laboratory of some professional scientific research institutions and specialty, be not suitable for small-sized manufacturing enterprise.
The utility model content
In order to overcome above-mentioned defective, the purpose of this utility model is to provide the Analysis of Metallic Materials that a kind of cost is lower, simple in structure, easy to operate, highly sensitive, applicability is strong instrument.
In order to achieve the above object, Analysis of Metallic Materials instrument of the present utility model comprises:
Current vortex sensor is used to detect metal measuring piece and output detection signal;
Testing circuit, the detection signal that the current vortex sensor that is used for receiving is exported converts effective electric signal to and should carry out exporting after the processing and amplifying by effective electric signal;
The analog quantity conversion that digital processing circuit, the testing circuit that is used for receiving are exported is effective digital signal, and is transported to single-chip microcomputer;
Single-chip microcomputer, the digital signal that is used for digital circuit output that will receive compares processing according to default program and standard signal, and will with the pairing metal identification signal conveys of the immediate standard signal of this digital signal to display;
Reservoir, be used for the storage standard signal and with the described standard signal valid data of metal identification signal one to one, and and single-chip microcomputer between transmit alternately;
Display is used to the signal that shows that single-chip microcomputer is exported;
Control device is used for the work of control single chip computer and display.
Wherein, described current vortex sensor is the reflective high frequency current vortex sensor.
Further, described testing circuit is resonant circuit, positive feedback method metering circuit or bridge measurement circuit.
Particularly, described digital processing circuit comprises amplifier, analog switch, A/D converter, comparer, digital filter, output interface.
Wherein, the A/D converting system of described digital processing circuit for constituting by delta sigma A/D conversion chip.
Above-mentioned structure will be stored in the storer through the standard signal that the metal standard component is taked earlier.During measurement, by the reflective high frequency current vortex sensor measurand is carried out information acquisition, give testing circuit with the signal of gathering, circuit conversion becomes effective electric signal and send digital processing circuit to after amplifying after testing, digital processing circuit converts the analog quantity of testing circuit output to effective digital signal, and be transported to single machine unit, single machine unit compares processing with itself and standard signal after receiving the significant figure signal that digital processing circuit sends here, and flows to display and show; Can reduce the price of Analysis of Metallic Materials instrument greatly, and the Analysis of Metallic Materials process is oversimplified, help promoting and use in Small and Medium Manufacturing Enterprises, component parts adopts the ripe components and parts of production domesticization, being convenient to commercial running produces in enormous quantities, has high economic benefit, metal material performance evaluation instrument based on current vortex sensor can be realized high-level efficiency, high-acruracy survey, realizable force Analysis of Metallic Materials instrument is towards miniaturization, intelligent, high precision, high efficiency direction of measurement development, the development of metal current material property analysis mode is very fast, but build is big, the price height, efficient is low, the shortcoming that analysis of material is single is difficult to overcome, metal material performance evaluation instrument based on current vortex sensor has overcome these shortcomings, and kept its advantage, miniaturization, price is low, the precision height, intelligentized metal material performance evaluation instrument, opened up the application of current vortex sensor in the metal material performance evaluation, the use of this instrument in the metal material performance evaluation will improve the efficient and the degree of accuracy of job analysis, and can increase the capable kind that can analyze of metal material, have important social benefit.
Description of drawings
Fig. 1 is the block diagram of the utility model specific embodiment.
Fig. 2 is the utility model medium-high frequency reflective electric vortex Fundamentals of Sensors figure.
Fig. 3 is the principle schematic of current vortex sensor in the utility model.
Fig. 4 is the schematic equivalent circuit of current vortex sensor in the utility model.
Fig. 5 is the resonant circuit figure of testing circuit in the utility model.
Fig. 6 is the tuning curve figure of testing circuit in the utility model.
Fig. 7 is the feedback transmitter metering circuit of testing circuit in the utility model.
Fig. 8 is the bridge measurement circuit of testing circuit in the utility model.
Fig. 9 is the utility model Analysis of Metallic Materials instrument circuit figure.
Figure 10 is the utility model Analysis of Metallic Materials instrument display circuit figure.
Figure 11 is the message processing flow figure of the utility model specific embodiment.
Figure 12 is the program flow diagram of the utility model specific embodiment.
Figure 13 is the Δ U-h performance plot of iron and aluminium in the utility model specific embodiment.
Embodiment
Below in conjunction with drawings and Examples the utility model is described in further detail.
Shown in Fig. 1-13, Analysis of Metallic Materials instrument of the present utility model comprises:
Current vortex sensor is used to detect metal measuring piece and output detection signal; Described current vortex sensor is the reflective high frequency current vortex sensor;
The reflective high frequency current vortex sensor is simple in structure, mainly must constitute by the flattened round coil by being placed on the skeleton, as shown in Figure 3.Sensing coil is excitatory by high-frequency current i, produces high-frequency alternating magnetic field, and this produces current vortex on by the lateral body plane.According to the law of electromagnetic induction, current vortex is to playing demagnetizing effect, with the variation that stops.The magnetic field that expression is produced by current vortex among the figure, thus with oppositely.Obviously more little apart from δ between cell winding and the measured body, eddy current effect is strong more, thereby non electrical quantity δ is converted to electric weight, with the measurement of realization displacement.
(2) equivalent electrical circuit
According to Kirchhoff's law, can list balance of voltage system of equations
R1I+jwL1I1-jwMI2＝U1
-jwMI1+R2I2+jwL2I2＝0
Solve
Can try to achieve coil thus is subjected to the equiva lent impedance behind the metallic conductor vortes interference to be:
The equivalent inductance of coil is
By formula as seen, because the influence of eddy current, the real part of coil impedance increases, and imaginary part reduces, so the quality factor q of coil descends.Impedance often claims its changing unit to be " reflected impedance " by becoming Z.The Q value of coil when Q0=WL1/R1 in Q=Q0=(1-L2w2M2/L1Z22)/(1+R2w2M2/R1Z2) formula, no vortes interference
The impedance of short-circuited conducting sleeve is Z=F (δ, ρ, f, μ
r), the reflective high frequency current vortex sensor can be realized the measurement of displacement.
(3) operating characteristic
1. the radial density of current vortex
The radial density of current vortex and sensing coil external diameter have certain proportionate relationship.
The radial density of current vortex and sensing coil are inversely proportional to measured body spacing δ.
2. the depth of penetration of current vortex
The depth of penetration h of current vortex is directly proportional with measured body eddy current loop resistance rate ρ, is inversely proportional to its relative permeability and supply frequency f, and it is as follows that it calculates relation:
3. the sensitivity of eddy current effect
The influence of measured body material physical property
The influence of measured body physical dimension
Non-linear
(4) device is selected
The model of current vortex sensor: JJ11CWY-DO
Technical parameter:
1. probe diameter: Φ 8mm*, Φ 11mm, Φ 18mm, Φ 25mm
2. the range of linearity: 2mm, 4mm, 8mm, 8mm
3. sensitivity: 8.0V/mm ± 4%, 4.0V/mm ± 4%, 1.5V/mm ± 4%, 1.5V/mm ± 4%
4. the linearity: systematic error≤± 1%
5. Frequency Response: 0～10KHZ
6. cable length: (5 meters *, 9 meters)
7. screw thread specification: M10 * 1, M14 * 1.5, M25 * 1.5, M30 * 2K
8. environment temperature :-10～+ 100 ℃ of (relative humidity :≤90%) of popping one's head in
This sensor has that the linearity is good, highly sensitive, the Frequency Response wide ranges, advantage such as wide conforms.
Testing circuit, the detection signal that the current vortex sensor that is used for receiving is exported converts effective electric signal to and should carry out exporting after the processing and amplifying by effective electric signal; Described testing circuit is resonant circuit, positive feedback method metering circuit or bridge measurement circuit;
According to eddy current effect principle and equivalent electrical circuit, the metering circuit of current vortex sensor output has following three kinds of forms:
1. resonant mode, as shown in Figure 5.
Resonance method is according to the circuit resonance principle, realizes the method that the current vortex sensor output signal is measured.Amplitude and frequency characteristic (Freguency response) according to the LC resonant circuit are divided into modulation method and frequency modulation method again.
A) modulation method
Be to form LC resonance in parallel with sensing coil and tuning capacity to return, have crystal oscillator that the high-frequency excitation electric current is provided, the output voltage of metering circuit is proportional to the impedance Z of LC resonant circuit, and exciting curent and resonance impedance Z are big more, and output voltage is high more.During initial state, sensor is adjusted LC loop resonance frequency and is equaled quartz oscillator promptly away from measured body
This moment the LC shunt-resonant circuit equiva lent impedance Z maximum, i.e. Z=Z0=1/R ' C.R ' is the equivalent resistance of resonant tank in the formula, and the L in the formula is sensing coil self-induction L1. beyond resonance frequency, and the equiva lent impedance in LC loop will significantly reduce, as shown in Figure 6.
When measured body was soft magnetic material, because magnetic permeability mu increases, the equivalent inductance L of resonant tank increased, and LC loop resonance frequency reduces, and tuning curve moves to left, and resonance impedance is reduced to by the initial state maximal value, and corresponding resonance frequency is f1.When measured body was Hard Magnetic or non-hard magnetic material, because magnetic permeability mu reduces, equivalent inductance L reduced, and LC loop resonance frequency increases, and tuning curve moves to right, and resonance impedance is reduced to by the initial state maximal value.
Corresponding resonance frequency is f2.Because the antiresonant circuit output voltage, thus between sensing coil and the measured body apart from the variation of δ, cause the variation of Z, make output voltage follow variation, thereby realize the measurement of displacement, so the title modulation method.
B) frequency modulation method
The frequency modulation method is to shake the frequency in humorous loop as output quantity with LC, directly measures with frequency meter; Or by measuring LC loop equivalent inductance L, indirect survey frequency variable quantity.
2. positive-feedback circuit method is as figure
3. bridge method is as figure
Figure neutralization is sensor two coil inductances, respectively with frequency-selecting electric capacity with compose in parallel two brachium pontis, and resistance and form other two brachium pontis.When static, bridge balance, bridge circuit output=0.During work, sensor is near measured body, eddy current effect equivalent inductance L changes, the measuring bridge out of trim, promptly ≠ 0, the size of obvious this output voltage U of output dc voltage U is proportional to the inductance value of cell winding send the wave detector detection after linearity is amplified after, to realize the measurement to metal material.
It is one of important applied field of eddy detection technology that the conductivity measurement of non-ferromagnetic metal and material are differentiated.The measurement of conductivity is to utilize eddy current device to measure the conductivity value of non-ferromagnetic metal.Can carry out material discriminating, the discriminating of condition of heat treatment and the evaluation of anticorrosion stress-resistant performance by the measurement result of conductivity value.It can be to be undertaken by the conductivity value that utilizes conductivity meter to measure different materials that material is differentiated, also can be to utilize its alloytype eddy-current instrument (as eddy current flaw detec, eddy current thickness meter) detects the difference of the eddy current response that the difference owing to material electric conductivity causes, and carry out the discriminating of different materials in view of the above, this detection often is not quantitative measurment, but test analysis qualitatively.The eddy current effect difference that the different plates of same thickness produces under same environment by survey sensor output difference, can identify corresponding to different metals.
The design adopts the bridge method testing circuit, and sort circuit has the linear amplification effect, the signal after the amplification send output dc voltage U after the wave detector detection obviously the size of this output voltage U be proportional to the inductance value of cell winding, to realize measurement to metal material.
The analog quantity conversion that digital processing circuit, the testing circuit that is used for receiving are exported is effective digital signal, and is transported to single-chip microcomputer; The A/D converting system that digital processing circuit is made of amplifier, analog switch, A/D converter, comparer, digital filter, the integrated delta sigma A/D conversion chip of output interface;
The effect of digital processing circuit mainly is the simulating signal of testing circuit output to be used analog to digital converter become effective digital signal.
A/D converter be that analog quantity with sensor output is transformed into digital quantity and handles for the Single Chip Microcomputer (SCM) system instructional signal, its choice relation is to the degree of accuracy and the degree of stability of Analysis of Metallic Materials instrument, the Analysis of Metallic Materials instrument is as legal measurement instrument simultaneously, its technical indicator, stability, reliability all have strict requirement, the standard that must meet country, therefore, when design, not only to consider cost for the selection of device, therefore the stability of more wanting that also will consider circuit make the device of circuit design few as much as possible.
The A/D conversion chip that adopts the delta sigma technology to make, has high integration degree, collection amplifier, analog switch, A/D converter, comparer, digital filter, output interface are integrated in one usually for it, only need several peripheral components just to constitute a complete A/D converting system, significantly reduced the printed-wiring board (PWB) wiring.Because its integrated level height so probability of malfunction adopts discrete component A/D converting system and obviously reduction, and then improves system reliability.
In addition, deploy the high-performance instrument amplifier in it, reduce requirement greatly signal source.Analysis of Metallic Materials instrument resistance strain weighing transducer output signal is the mV level, if just can carry out the A/D conversion after adopting general A/D converter often to need to amplify.And the delta sigma A/D converter has mostly adopted programmable-gain amplifier, multinomial advanced technologies such as programmable digital filtering, multiple self calibration technology, and most microprocessors that adopt are managed and the control transformation program, owing to adopted multiple comprehensive technical measure, Amplifier Gain adjustment, digital filtering and error correction all concentrate in the same chip, peripheral components is few, and is easy to use and reliable.Its these advantages are just meeting the Analysis of Metallic Materials instrument just towards miniaturization, high precision, intelligent direction development.
Therefore, the design of Analysis of Metallic Materials instrument selects for use the delta sigma analog to digital converter comparatively reasonable.Existing market delta sigma A/D converter model is many, and performance index are also different, selects the performance requirement decision of the delta sigma A/D converter of what model according to the Analysis of Metallic Materials instrument for use.For static state, commercial Analysis of Metallic Materials instrument, often selecting resolution for use is 16 to 24 A/D converter.Therefore, the design selects commercial CS1180A/D converter.
The connection layout of the Analysis of Metallic Materials instrument circuit of being made up of integrated circuit CS1180A/D converter as shown in Figure 9.
Single-chip microcomputer, the digital signal that is used for digital circuit output that will receive compares processing according to default program and standard signal, and will with the pairing metal identification signal conveys of the immediate standard signal of this digital signal to display;
Demonstration is handled and controlled to the weighing signal that single-chip microcomputer is handled and circuit the design single chip computer AT 89C52 realization in display part is imported A/D converter.AT89C52 has: keyboard/display interface that 1. 1 special use is arranged; 2. 1 full duplex asynchronous serial communication interface is arranged; 3. 2 16 bit timings/counters are arranged.Like this, 1 89C52 chip has been born the work of 3 special purpose interface chips.Cost is descended greatly, and optimized hardware configuration and software design, use and bring many convenience.The P0 of 89C52, P1, P2 mouth are as keyboard/display interface.Carry out the keyboard input and show output with the method for program scanning.The P0 mouth is as the field mouth, and the P1 mouth is as the row input port of keyboard, and P2 is as the word bit mouth of display and the line scanning delivery outlet of keyboard.Because display word bit mouth electric current is bigger, the P2 mouth need carry out current drives.This versatile interface can connect 8 light-emitting diode displays and 18 * 8 chain drum matrix at most.The processes and displays partial circuit that AT89C52 design arranged as shown in figure 10.
Reservoir, be used for the storage standard signal and with the described standard signal valid data of metal identification signal one to one, and and single-chip microcomputer between transmit alternately;
Display is used to the signal that shows that single-chip microcomputer is exported;
Control device is used for the work of control single chip computer and display, control survey process and measurement result.
The design of software section will be carried out according to the signal processing flow of Analysis of Metallic Materials instrument, and the Signal Processing flow process is in the Analysis of Metallic Materials instrument circuit: the Analysis of Metallic Materials instrument requires that timely data acquisition is arranged, handle, deposit the result, send the operational process of demonstration.According to this requirement,
The process flow diagram of the information measurement of Analysis of Metallic Materials instrument and its information processing of processing divides three phases as shown in figure 11:
(1) under the control of microprocessor, the voltage signal of changing through sensor send A/D converter to handle by input circuit,
Become the corresponding digital amount, be deposited in the data-carrier store.
(2) microprocessor carries out the data necessary processing to the measurement data of gathering, as characteristic compensation, digital filtering, scale transformation etc.
(3) display process result is treated to data-signal demonstration and writes down desired signal format, by output interface circuit output and demonstration and record.
According to Analysis of Metallic Materials instrument message processing flow figure, program debug for convenience and raising reliability, program design is adopted from top to bottom, modularization, structural program design method, total programming process is progressively segmented, resolve into functional module one by one, each functional module is separate, and each module can both be finished a clear and definite task, realizes the function that certain is concrete.The design presses the program that task module is divided
Mainly contain initialize routine, master routine, A/D conversion routine, display subroutine, keyboard are handled subroutine.
(1) Initializing Designing Program:
After Single Chip Microcomputer (SCM) system powers on, enter initialize routine, finish the setting of each module in the single-chip microcomputer sheet and the function setting initialization of A/D converter, enter master routine then.
(2) master routine design
Single-chip microcomputer finishes that initialize routine is laggard goes into master routine, and master routine is mainly finished the reading of stored parameter, and detected data are carried out data processing, and key is handled, display process etc.The process flow diagram of master routine as shown in figure 12.Its operation written program is attached.
Because of the design itself requires that functions such as stability is high, non-maintaining, antijamming capability is strong are arranged, the precision that system debug is handled except verification msg outside the accuracy of guaranteeing to judge, must be confirmed the normal operation of every function simultaneously.
According to system design scheme, the debugging of native system is divided into and is three parts: hardware debug, software debugging and software and hardware uniting and adjustment.Because in the system design adopted modular design, so made things convenient for step-by-step measurement to each circuit function module, it is right to comprise: sensor performance debugging, digital processing circuit debugging.Direct and the hardware system uniting and adjustment of system software are achieved all functions of system.
Very complicated based on the Analysis of Metallic Materials instrument system of current vortex sensor, after the circuit installation, at first check, confirm that promptly circuit does not have rosin joint, no short circuit, nothing opens circuit, and whether integrated component is installed correct, carry out the classification debugging of circuit function module afterwards, carry out step by step according to circuit function:
(1) the output waveform adjustment of each link in the circuit
Use oscillograph the output waveform of each link in the circuit is measured, and corresponding circuit is adjusted or components and parts are changed, make that the output waveform of each link adheres to specification in the circuit.
(2) debugging of sensor measuring circuit
The output voltage signal that uses multimeter, ac millivoltmeter, counterweight, signal generator survey sensor metering circuit is followed the counterweight weight change and the linear relationship that changes.
(3) measurement of A/D converter and adjustment
Use signal generator, digital circuit experiment platform mainly to measure the linearity of A/D converter circuit, conversion and see whether designing requirement.
(4) measurement of processes and displays circuit and adjustment
Use digital circuit experiment platform, logical table, multimeter that the logic function that whether meets design is seen in current potential, output waveform and the logic function measurement of processes and displays circuit.
Software debugging needs a careful comprehensive process, and the general method content of clear debugging earlier is to detect the software processes of data to the software debugging key of Analysis of Metallic Materials instrument.Measuring accuracy and reliability are the keys of Analysis of Metallic Materials instrument design, introduce the software data treatment technology, can overcome or remedy the defective or the weakness of each the measurement links hardware itself that comprises sensor, the signal Processing that originally is difficult to realize by hardware circuit can be resolved, improve the combination property of Analysis of Metallic Materials instrument.In the Analysis of Metallic Materials system, main data processing technique has:
The elimination of invalid physical quantity, drift processing, nonlinear compensation technology etc.
(1) elimination of invalid physical quantity
In the metal material measuring system, the signal of current vortex sensor output is the switching signal of platform, support and measured object sum, and what reality will be surveyed is the magnetic effect of measured object.Therefore, platform, support etc. is invalid physical quantity, will eliminate with software approach in signal processing.
The input interface data acquisition
Data storage
Characteristic is mended and is tasted processing
Calculation process
Format is handled
Record shows uses data
Output interface
(drive and show)
(2) drift is handled
Zero-bit is stable to be to influence Analysis of Metallic Materials instrument precision important factors, will cause the zero-bit instability because of influenced by temperature or other factors, and this phenomenon is called drift.Because the influence of drift, during zero input signal, output may be non-vanishing, for eliminating this zero drift value, adopt the zero compensation technology, zero compensation stores this zero drift value exactly, deduct this numerical value during each data acquisition, the numerical value that obtains is exactly the useful signal of eliminating drift.
(3) nonlinear compensation
In detection, be linear because the input-output characteristic of detecting sensor is often only approximate within the specific limits, in some scope, then obviously be non-linear, simultaneously, sensor has discreteness, has also that temperature is floated, a hysteresis etc.Also the popular software disposal route compensates and proofreaies and correct above error in signal processing.The method that nonlinear compensation commonly used is handled has three kinds: piecewise linear interpolation method, curve fitting method, look-up table.Input-output curve for not too crooked can adopt linear interpolation method, for very crooked input-output curve, can adopt the second-degree parabola method of interpolation, for irregular input-output curve, can adopt the sectional curve fitting process.For detection system, because its nonlinearity is not very big, so often adopt the piecewise linear interpolation method with the reflective electric vortex sensor.
After each element circuit debugging, carry out the connection and the debugging of complete machine again.Observe earlier after the complete machine energising, unusual circumstance is in time cut off the power supply, phenomenon decision problem place according to fault, check step by step and fix a breakdown, if the various function of circuit goes wrong, analyze one by one, again the units corresponding circuit is detected debugging, carry out up to adhering to specification so repeatedly.
Current vortex sensor can realize that the noncontact metal material measures, and measurand is not had influence, and simple in structure, highly sensitive, applicability is strong.Adopt reflective high frequency eddy current sensor that metallic aluminium and iron are carried out experiments of measuring as Fig. 2.Obtain by experiment as following table 1,2 data.According to the data that record, draw the Δ U-h performance plot that taps a blast furnace with aluminium, as shown in figure 13.
Table 1 aluminum plate material thickness-voltage
| Thickness (mm) | U0 voltage (V) | ΔU(V) |
| 0.7 | 4.88 | 0.12 |
| 1.4 | 4.81 | 0.19 |
| 1.6 | 4.72 | 0.28 |
Table 2 irony sheet metal thickness-voltage
| Thickness (mm) | U0 voltage (V) | ΔU(V) |
| 0.8 | 4.60 | 0.40 |
| 1.6 | 4.23 | 0.77 |
| 2.4 | 3.80 | 1.20 |
And have some row advantages such as simple in structure, highly sensitive, that applicability is strong.This instrument has been realized the measurement of contactless metal material, has application and popularization value preferably.
The utility model is not limited to above-mentioned embodiment, no matter do any variation on its shape or structure, everyly utilizes above-mentioned all to be a kind of distortion of the present utility model, all should to think and drop within the utility model protection domain.
Claims (5)
1. an Analysis of Metallic Materials instrument is characterized in that, comprising:
Current vortex sensor is used to detect metal measuring piece and output detection signal;
Testing circuit, the detection signal that the current vortex sensor that is used for receiving is exported converts effective electric signal to and should carry out exporting after the processing and amplifying by effective electric signal;
The analog quantity conversion that digital processing circuit, the testing circuit that is used for receiving are exported is effective digital signal, and is transported to single-chip microcomputer;
Single-chip microcomputer, the digital signal that is used for digital circuit output that will receive compares processing according to default program and standard signal, and will with the pairing metal identification signal conveys of the immediate standard signal of this digital signal to display;
Reservoir, be used for the storage standard signal and with the described standard signal valid data of metal identification signal one to one, and and single-chip microcomputer between transmit alternately;
Display is used to the signal that shows that single-chip microcomputer is exported;
Control device is used for the work of control single chip computer and display.
2. Analysis of Metallic Materials instrument as claimed in claim 1 is characterized in that, described current vortex sensor is the reflective high frequency current vortex sensor.
3. Analysis of Metallic Materials instrument as claimed in claim 2 is characterized in that, described testing circuit is resonant circuit, positive feedback method metering circuit or bridge measurement circuit.
4. Analysis of Metallic Materials instrument as claimed in claim 3 is characterized in that described digital processing circuit comprises amplifier, analog switch, A/D converter, comparer, digital filter, output interface.
5. Analysis of Metallic Materials instrument as claimed in claim 4 is characterized in that, the A/D converting system of described digital processing circuit for being made of delta sigma A/D conversion chip.
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| CN104914158A (en) * | 2015-05-13 | 2015-09-16 | 南京航空航天大学 | High-frequency electromagnetic eddy current detection system used for carbon fiber composite material damage detection |
| CN106441378A (en) * | 2016-10-19 | 2017-02-22 | 珠海格力节能环保制冷技术研究中心有限公司 | Eddy current sensor, determining method of material level adjustment resistor of eddy current sensor, and test method |
| CN106841378A (en) * | 2017-03-07 | 2017-06-13 | 广西电网有限责任公司电力科学研究院 | A kind of in-service power transformer lead material original position Undamaged determination method |
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| CN108426944A (en) * | 2018-03-14 | 2018-08-21 | 鲁东大学 | One kind is based on the lossless metal defect detection in-line calibration method and system of vortex |
| CN108535329A (en) * | 2018-03-26 | 2018-09-14 | 哈尔滨工业大学 | The test device of thin layer of conductive material, the test method of sheet resistance, the test method of damage information |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104914158A (en) * | 2015-05-13 | 2015-09-16 | 南京航空航天大学 | High-frequency electromagnetic eddy current detection system used for carbon fiber composite material damage detection |
| CN104914158B (en) * | 2015-05-13 | 2018-02-16 | 南京航空航天大学 | A kind of high-frequency electromagnetic eddy detection system for carbon fibre composite damage check |
| CN107462782A (en) * | 2016-06-02 | 2017-12-12 | 镇江腾龙智能科技有限公司 | Streaming potential on-line measurement instrument definitely designs with relative detection signal |
| CN106441378A (en) * | 2016-10-19 | 2017-02-22 | 珠海格力节能环保制冷技术研究中心有限公司 | Eddy current sensor, determining method of material level adjustment resistor of eddy current sensor, and test method |
| CN106841378A (en) * | 2017-03-07 | 2017-06-13 | 广西电网有限责任公司电力科学研究院 | A kind of in-service power transformer lead material original position Undamaged determination method |
| CN108426944A (en) * | 2018-03-14 | 2018-08-21 | 鲁东大学 | One kind is based on the lossless metal defect detection in-line calibration method and system of vortex |
| CN108535329A (en) * | 2018-03-26 | 2018-09-14 | 哈尔滨工业大学 | The test device of thin layer of conductive material, the test method of sheet resistance, the test method of damage information |
| CN110133380A (en) * | 2019-06-28 | 2019-08-16 | 重庆航天职业技术学院 | A kind of dielectric constant contrasting detection device |
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