CN207379978U - A kind of conductivity meter based on impulse eddy current - Google Patents
A kind of conductivity meter based on impulse eddy current Download PDFInfo
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- CN207379978U CN207379978U CN201721446836.XU CN201721446836U CN207379978U CN 207379978 U CN207379978 U CN 207379978U CN 201721446836 U CN201721446836 U CN 201721446836U CN 207379978 U CN207379978 U CN 207379978U
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- eddy current
- signal
- excitation coil
- conductivity meter
- impulse eddy
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Abstract
The utility model is related to a kind of conductivity meters based on impulse eddy current, including current vortex sensing probe, square-wave pulse generator, power amplifier, signal amplifier and processor, the square-wave pulse generator is connected by power amplifier with the input terminal of current vortex sensing probe, the output terminal of the current vortex sensing probe is connected by signal amplifier with processor, and the processor is also connected with square-wave pulse generator；The transducing signal that the processor generates current vortex sensing probe is handled to obtain conductivity value with reference signal.The utility model can improve the accuracy of the conductivity measurement to irregular surface workpiece.
Description
Technical field
The utility model is related to conductivity metal field of measuring technique, more particularly to a kind of conductance based on impulse eddy current
Rate instrument.
Background technology
Electric conductivity is the essential attribute of metal material, and electrical conductivity is a basic physical parameters of metal material.It with gold
Constituent, working condition, the temperature of category etc. are closely related.In field of non destructive testing, often gold can be judged by measuring electrical conductivity
Stress, fatigue or the condition of heat treatment of metal work-pieces.Conductivity metal measuring method mainly has four electrode method and electric vortex method,
In, electric vortex method has many advantages, such as high sensitivity, easy to operate.
Most eddy conductivity measuring instruments using single-frequency sinusoidal motivation, by measuring coil impedance magnitude with (or) phase angle
Variation, pass through demarcate obtain conductivity value.But lift-off distance, probe inclination, workpiece roughness, workpiece surface curvature pair
Coupling tool has a significant impact, and so as to also affect the impedance of coil, causes measurement error.Some are in order to adapt to the song of workpiece surface
Rate changes, it is desirable that probe is made very small to be preferably bonded with measured workpiece, this gives the conductance of the workpiece with irregular surface
Rate measurement brings very high requirement.
Utility model content
The technical problem to be solved by the utility model is to provide a kind of conductivity meters based on impulse eddy current, can improve
To the accuracy of the conductivity measurement of irregular surface workpiece.
Technical solution is used by the utility model solves its technical problem：A kind of conductance based on impulse eddy current is provided
Rate instrument, including current vortex sensing probe, square-wave pulse generator, power amplifier, signal amplifier and processor, the square wave
Impulse generator is connected by power amplifier with the input terminal of current vortex sensing probe, the output of the current vortex sensing probe
End is connected by signal amplifier with processor, and the processor is also connected with square-wave pulse generator；The processor is by electricity
The transducing signal that eddy-current sensor probes generate is handled to obtain conductivity value with reference signal.
The amplification factor of the power amplifier is 10.
The processor is arm processor, and at least with two-way input end of analog signal, and inside AD at least has 16
Above resolution ratio.
The current vortex sensing probe includes excitation coil, Magnetic Sensor and shell；The excitation coil is mounted on shell
Inside, and make the measurement end face of excitation coil that the shell is subject to protect；The Magnetic Sensor is placed in the excitation coil
Center, and close to one end of measurement end face；The excitation coil is connected by conducting wire with the output terminal of power amplifier, the magnetic
The output terminal of sensor is connected by conducting wire with the input terminal of signal amplifier.
The excitation coil is air core coil, by enameled wire coiling, enamel-cover linear diameter 0.19mm.
The height of the excitation coil is more than outer diameter, and outer diameter 16mm, internal diameter 6mm are highly 20mm.
The Magnetic Sensor is linear hall sensor, and measurement magnetic direction is excitation coil axis direction.
The shell is made of nonmetallic materials.
Advantageous effect
As a result of above-mentioned technical solution, the utility model compared with prior art, has the following advantages that and accumulates
Pole effect：The utility model by processor to measuring signal compared with reference signal, obtained using the differential signal of the two
To electrical conductivity so that final measurement result from workpiece surface roughness, surface curvature and scrambling influence, while
It is influenced from Lift-off effect, lift-off changes 0~2mm, and measurement error also influences, when current vortex becomes below 1% from operation thickness
When skin depth is more than operation thickness, measurement result is still accurate, and error is below 2%.In addition, the test probe of the utility model
Effectively measurement end face can be protected with shell, so that it is guaranteed that the accuracy of test.
Description of the drawings
Fig. 1 is the block diagram of the utility model；
Fig. 2 is the structure diagram of current vortex sensing probe in the utility model；
Fig. 3 is reference curve and experiment curv figure in the utility model embodiment；
Fig. 4 is differential signal and difference continuation signal graph in the utility model embodiment；
Fig. 5 is the amplitude frequency curve figure of the difference continuation signal in the utility model embodiment.
Specific embodiment
With reference to specific embodiment, the utility model is expanded on further.It is to be understood that these embodiments are merely to illustrate this
Utility model rather than limitation the scope of the utility model.In addition, it should also be understood that, reading the content of the utility model instruction
Afterwards, those skilled in the art can make various changes or modifications the utility model, and such equivalent forms equally fall within this Shen
It please the appended claims limited range.
The embodiment of the utility model is related to a kind of conductivity meter based on impulse eddy current, as shown in Figure 1, including electric whirlpool
Stream sensing probe, square-wave pulse generator, power amplifier, signal amplifier and processor, the square-wave pulse generator lead to
Overpower amplifier is connected with the input terminal of current vortex sensing probe, and the output terminal of the current vortex sensing probe is put by signal
Big device is connected with processor, and the processor is also connected with square-wave pulse generator；The processor is by current vortex sensing probe
The transducing signal of generation is handled to obtain conductivity value with reference signal.
As shown in Fig. 2, the current vortex sensing probe includes excitation coil, Magnetic Sensor and shell；The excitation coil
Installation inside the housing, and makes the measurement end face of excitation coil that the shell is subject to protect；The Magnetic Sensor is placed in described
The center of excitation coil, and close to one end of measurement end face；The excitation coil passes through conducting wire and the output terminal of power amplifier
It is connected, the output terminal of the Magnetic Sensor is connected by conducting wire with the input terminal of signal amplifier.It is noted that this implementation
Two conducting wires are positioned in cable 4 in mode, are connected by cable 4 with power amplifier and signal amplifier, so that connecing
Line is more simple and convenient.
In present embodiment, excitation coil uses air core coil, and by enameled wire coiling, and the height of excitation coil is more than
Outer diameter, outer diameter is 16mm, internal diameter 6mm in present embodiment, is highly 20mm.Magnetic Sensor uses linear hall sensor,
It is coil axis direction that it, which measures magnetic direction,.Shell is made of nonmetallic materials, can such as select plastics or polytetrafluoroethyl-ne
Alkene etc..Square-wave pulse generator is used to generate certain frequency and the square-wave signal of certain duty cycle, in the present embodiment, square wave
Frequency is 120Hz, and duty cycle 0.2, voltage peak-to-peak value is 2V, and the square-wave signal of generation loads on excitation by power amplifier
Coil, in the present embodiment, the amplification factor of power amplifier is 10.In the effect of excitation coil, Magnetic Sensor starts work
Make detection magnetic field signal, and the magnetic field signal detected is transferred to after signal amplifier amplifies in processor and carries out AD turns
It changes.In present embodiment, processor uses arm processor, at least with two-way input end of analog signal, wherein, it is used for all the way
Magnetic transducing signal is received, another way is for receiving reference signal, and AD at least has 16 or more inside the arm processor
Resolution ratio.
The utility model is further illustrated below by specific embodiment.
During measurement, first current vortex sensing probe is placed in air, one group of magnetic field signal is collected, and it is normalized
Processing, this group of signal are reference signal.Then current vortex sensing probe is collected into another group of magnetic field letter close to test specimen
Number, also to its normalized, this group of signal is known as measuring signal, and the two curve is as shown in Figure 3.Measuring signal and reference signal
Into after arm processor, first carry out difference processing and obtain the differential signal of the two, which obtains difference by signals extension
Divide continuation signal (see Fig. 4), carrying out FFT transform to difference continuation signal obtains the amplitude frequency curve of differential signal (see Fig. 5).It is worth
It is noted that it is the prior art to carry out difference processing, signals extension processing and FFT transform processing using arm processor, this
Application is not improved above-mentioned processing procedure therefore does not repeat.
In one embodiment, the AD conversion precision of arm processor is 16, and one group of signal length is 8192 data,
Continuation multiple is 8.In another embodiment, AD conversion precision is 16, and one group of signal length is 8192 data, and continuation is again
Number is 32.
Calculate characteristic frequency point Amplitude Ration, in one embodiment, characteristic frequency point be f2 and f4, the Amplitude Ration of calculating
γ=Af2/Af4, Af2It is characterized the amplitude that Frequency point is f2, Af4It is characterized the amplitude that Frequency point is f4.In another embodiment
In, characteristic frequency point is f3 and f5, Amplitude Ration γ=A of calculatingf3/Af5, Af3It is characterized the amplitude that Frequency point is f3, Af5For spy
Levy the amplitude that Frequency point is f5.It is that can obtain the electrical conductivity of test specimen according to Amplitude Ration γ and nominal data.In an implementation
In example, the expression formula of electrical conductivity and Amplitude Ration is：The γ of δ=0.27653-1.28γ2+2.0114γ-1.0512.Need what is illustrated
It is that be performed mathematical calculations using arm processor be a kind of highly developed prior art.
Non-ferromagnetic metal electrical conductivity is measured based on the conductance instrument of impulse eddy current, measurement result is from carrying
Separation has lift-off very big adaptability, stability is high, measurement knot from, influences such as roughness, curvature, surface irregularity
Fruit is accurate, and the electrical conductivity available for measurement metal, which either detects workpiece fatigue, stress or corrosion etc., electrical conductivity to be caused to become
The situation of change.
Claims (8)
1. a kind of conductivity meter based on impulse eddy current, including current vortex sensing probe, square-wave pulse generator, power amplification
Device, signal amplifier and processor, which is characterized in that the square-wave pulse generator is sensed by power amplifier and current vortex
The input terminal of probe is connected, and the output terminal of the current vortex sensing probe is connected by signal amplifier with processor, the place
Reason device is also connected with square-wave pulse generator；The transducing signal and reference signal that the processor generates current vortex sensing probe
It is handled to obtain conductivity value.
2. the conductivity meter according to claim 1 based on impulse eddy current, which is characterized in that the power amplifier is put
Big multiple is 10.
3. the conductivity meter according to claim 1 based on impulse eddy current, which is characterized in that the processor is at ARM
Device is managed, at least with two-way input end of analog signal, and inside AD at least has the resolution ratio of 16 or more.
4. the conductivity meter according to claim 1 based on impulse eddy current, which is characterized in that the current vortex sensing probe
Including excitation coil, Magnetic Sensor and shell；The excitation coil installation inside the housing, and makes the measurement end of excitation coil
Face is subject to the shell to protect；The Magnetic Sensor is placed in the center of the excitation coil, and close to one end of measurement end face；Institute
It states excitation coil by conducting wire with the output terminal of power amplifier to be connected, the output terminal of the Magnetic Sensor passes through conducting wire and signal
The input terminal of amplifier is connected.
5. the conductivity meter according to claim 4 based on impulse eddy current, which is characterized in that the excitation coil is hollow
Coil, by enameled wire coiling, enamel-cover linear diameter 0.19mm.
6. the conductivity meter according to claim 4 based on impulse eddy current, which is characterized in that the height of the excitation coil
More than outer diameter, outer diameter 16mm, internal diameter 6mm are highly 20mm.
7. the conductivity meter according to claim 4 based on impulse eddy current, which is characterized in that the Magnetic Sensor is linear
Hall sensor, measurement magnetic direction are excitation coil axis direction.
8. the conductivity meter according to claim 4 based on impulse eddy current, which is characterized in that the shell is using nonmetallic
Material is made.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721446836.XU CN207379978U (en) | 2017-11-02 | 2017-11-02 | A kind of conductivity meter based on impulse eddy current |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721446836.XU CN207379978U (en) | 2017-11-02 | 2017-11-02 | A kind of conductivity meter based on impulse eddy current |
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| Publication Number | Publication Date |
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| CN207379978U true CN207379978U (en) | 2018-05-18 |
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| CN201721446836.XU Expired - Fee Related CN207379978U (en) | 2017-11-02 | 2017-11-02 | A kind of conductivity meter based on impulse eddy current |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107727733A (en) * | 2017-11-02 | 2018-02-23 | 上海市特种设备监督检验技术研究院 | A kind of conductivity meter based on impulse eddy current |
-
2017
- 2017-11-02 CN CN201721446836.XU patent/CN207379978U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107727733A (en) * | 2017-11-02 | 2018-02-23 | 上海市特种设备监督检验技术研究院 | A kind of conductivity meter based on impulse eddy current |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180518 Termination date: 20181102 |