CN201096843Y - Detection device for measuring metal conductivity instrument based on backset phase - Google Patents
Detection device for measuring metal conductivity instrument based on backset phase Download PDFInfo
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- CN201096843Y CN201096843Y CNU2007200082897U CN200720008289U CN201096843Y CN 201096843 Y CN201096843 Y CN 201096843Y CN U2007200082897 U CNU2007200082897 U CN U2007200082897U CN 200720008289 U CN200720008289 U CN 200720008289U CN 201096843 Y CN201096843 Y CN 201096843Y
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Abstract
The utility model discloses a detection device in the measurement of metal conductivity instruments with an eddy current phase method, which comprises a probe and an AC bridge. The probe circuit is formed from the series connection of a magnetic test coil L2 and an auxiliary coil L1, and the AC bridge is composed of the digital potentiometers U4 and U5, and the resistance R1, R2, R3 and R4. The resistance R1, the digital potentiometer U4 and the resistance R2 are in sequent series connection, so is the resistance R3, the potentiometer U5 and the resistance R4. Three circuits in series connection are in parallel connection. A slider end of the digital potentiometer U5 is connected to the position between the magnetic test coil L2 and the auxiliary coil L1 in the probe circuit, and a signal is output through an AC energized power source to both ends of the parallel circuit. The control terminals of the digital potentiometer U4 and U5 are respectively connected to a single chip microcomputer in the instrument, and the slider ends of the digital potentiometer U4 and U5 are for the outputting of the voltage signals. With the device, the interference impact is effectively inhibited and extracted. The utility model has the measurement accuracy, high precision and automatic zeroing correction features, thus the issue of the probe that is difficult to match in the replacement is resolved.
Description
Technical field
The utility model relates to the instrument that a kind of eddy current phase method is measured the conductivity metal value, the particularly pick-up unit in the surveying instrument.
Background technology
The sixties in 20th century, Germany FORSTER research institute application electric vortex method was succeeded in developing the conductivity metal measuring instrument first.Evolution through decades along with electronic technology and fast development of computer technology, has driven the continuous lifting of eddy detection technology.
Eddy-current method detects the conductivity metal value, mainly be to be based upon on the eddy current impedance analysis ratio juris basis, when the magnetic test coil that is loaded with alternating current during near metallic conductor, because coil magnetic field effect, metallic conductor can generate eddy current, and the counter magnetic field of eddy current changes the impedance (being Z=R+j ω L) of magnetic test coil, by the alternating current bridge output unbalance voltage that links to each other, carry out data analysis through single-chip microcomputer, can obtain the conductivity value of tested metal.The impedance factors that influences magnetic test coil has physical dimension, temperature, detection frequency and the Lift-off effect of the conductivity of metallic conductor, magnetic permeability, conductor, for non-ferromagnetic metal, when temperature, detect influence factors such as frequency, conductor physical dimension for fixedly the time, disturb as long as suppress Lift-off effect effectively, have unique corresponding relation between the conductivity of metallic conductor and the magnetic test coil impedance.The impedance variation analysis to measure of magnetic test coil can be divided into the impedance magnitude measurement and impedance phase is measured, the former utilizes and measures the conductivity value that metallic conductor is obtained in the variation of magnetic test coil impedance magnitude, though this kind method probe resolution is higher, circuit soft, hardware design is simple, but be difficult to overcome the interference of Lift-off effect, the performance index of instrument are subjected to the influence of environment temperature and operation factors very big, can not guarantee higher measuring accuracy.The latter changes the conductivity value of obtaining metallic conductor for measuring the magnetic test coil impedance phase angle, though detect impedance phase angle varying circuit complexity, technical difficulty is big, but the impedance phase method can solve the influence that Lift-off effect disturbs within the specific limits, reduce the error that environment temperature and misoperation cause, improve the measuring accuracy and the stability of instrument.
Foreign technology advanced person's country developed high precision, multiple test frequency in succession in recent years, probe is interchangeable, and had the digital metal conductivity meter of temperature compensation and high lift-off compensation.As the German Fischer SMP10 of company conductivity meter, the Britain Autosigma3000 of Hocking company conductivity meter.Though external advanced conductivity meter precision height is advanced in performance, price is very expensive, complicated operation, and the maintenance maintenance inconvenience has increased great difficulty for this advanced person's technical products penetration and promotion.Owing to the making to magnetic test coil in the probe requires very strictness,, will cause the error of a lot of measurement indexes of instrument, the consistance that is difficult to accomplish every probe in addition if minute differences is arranged.When probe damages, can't simply change new probe and use, the problem that exists probe to be difficult to change like this.
The utility model content
In order to overcome the deficiencies in the prior art, the utility model provides a kind of pick-up unit that can be used for measuring in the conductivity metal value instrument, it utilizes eddy current impedance phase method and adopts digital regulation resistance to make up alternating current bridge, and ancillary coil fitted together with magnetic test coil, not only solved the problem that when probe is changed, is difficult to join type, and utilize eddy current impedance phase method can effectively suppress to lift from disturbing effect, have measure accurately, precision is high and excellent function such as automatic zero set (AZS) correction.
Fundamental purpose of the present utility model is to provide the pick-up unit in a kind of eddy current phase method measurement conductivity metal value instrument, it utilizes eddy current impedance phase method and adopts digital regulation resistance to make up alternating current bridge, can effectively suppress to lift from disturbing effect, have measure accurately, precision is high and excellent function such as automatic zero set (AZS) correction.
Secondary objective of the present utility model is to provide the pick-up unit in a kind of eddy current phase method measurement conductivity metal value instrument, and it has solved the problem that is difficult to join type when probe is changed with ancillary coil with the magnetic test coil device together.
To achieve these goals, solution of the present utility model is:
The eddy current phase method is measured the pick-up unit in the conductivity metal value instrument, comprises probe and alternating current bridge, and the probe circuit part is formed by magnetic test coil L2 and ancillary coil L1 serial connection; Alternating current bridge is made up of two digital regulation resistance U4, U5 and four resistance R 1, R2, R3, R4, and resistance R 1, digital regulation resistance U4 are connected in series successively with resistance R 2, and resistance R 3, digital regulation resistance U5 are connected in series successively with resistance R 4; Three sequential circuit parallel connections, and digital regulation resistance U5 cursor slide end is connected in the probe circuit between the magnetic test coil L2 and ancillary coil L1, ac-excited power supply outputs signal to the parallel circuit two ends, the control end of digital regulation resistance U4, U5 links to each other with single-chip microcomputer in the instrument respectively, and the cursor slide end of digital regulation resistance U4, U5 is output voltage signal then.
Described probe also comprises housing, core body and fastening cap, magnetic test coil L2 and ancillary coil L1 are assembled in the inner chamber of core body, one end of housing is fastening cap fixedly, the connecting line of the output line at probe circuit two ends and itself and digital regulation resistance U5 cursor slide end is passed and is connected to alternating current bridge by fastening cap, core body is nested with in housing and show out its test side.
Be provided with the stage clip of adjustment between described core body and the housing.
Described inner walls is to projecting inward formation inner convex platform, and the core body outer wall outwards protrudes the formation outer lug boss, and the two ends of stage clip are against on inner convex platform and the outer lug boss.
Described housing is a column.
A temperature sensor that temperature signal can be provided to single-chip microcomputer also is installed in the described core body.
After adopting such scheme, the applicable employing eddy current phase of the utility model method is measured the instrument of metallic conductor conductivity value, thereby overcome the Lift-off effect influence that measured conductor surface irregularity, coarse irregular, surface coating and misoperation etc. cause, guarantee the measuring accuracy and the accuracy of instrument.
The utlity model has following advantage:
1, adopts alternating current bridge and probe to form pick-up unit, can utilize the Single-chip Controlling digital regulation resistance, realized instrument automatic zero set (AZS) and calibration function, simplify the running program of instrument, improve detection speed.
2, the probe core body inner chamber is equipped with magnetic test coil and ancillary coil, and two coils can directly mate on probe, make indexs such as each probe sensitivity, linearity reach basically identical, have solved the probe interchange issues.
3, probe is provided with the balance stage clip, and housing parts separates by stage clip with core body, has guaranteed that the probe flat end fully steadily contacts with tested metal flat, has overcome the measuring error that misoperation causes, and guarantees the accuracy and the repeatability of apparatus measures.
4, can install temperature sensor simultaneously on the probe, can measure the temperature of tested metal fast, the conductivity value of measuring under the different temperatures is carried out the temperature correction-compensation, realize temperature self-compensation function, guarantee the accuracy of apparatus measures conductivity value.
Description of drawings
Fig. 1 is circuit theory diagrams of the present utility model;
Fig. 2 is sonde configuration figure of the present utility model;
Fig. 3 is that the utility model applies to the circuit structure block diagram in the eddy current phase method measurement conductivity metal value instrument;
Fig. 4 is the circuit diagram of the utility model specific embodiment;
Fig. 5 is the impedance normalization figure of magnetic test coil L2 of the present utility model.
Embodiment
Please cooperate shown in Figure 1ly, a kind of eddy current phase method that the utility model discloses is measured the pick-up unit in the conductivity metal value instrument, comprises probe 2 and alternating current bridge 3, and wherein, 2 circuit parts of popping one's head in are formed by magnetic test coil L2 and ancillary coil L1 serial connection; Alternating current bridge 3 is made up of two digital regulation resistance U4, U5 and four resistance R 1, R2, R3, R4, and resistance R 1, digital regulation resistance U4 are connected in series successively with resistance R 2, and resistance R 3, digital regulation resistance U5 are connected in series successively with resistance R 4; Three sequential circuit parallel connections, and digital regulation resistance U5 cursor slide end is connected in probe 2 circuit between magnetic test coil L2 and the ancillary coil L1, ac-excited power supply outputs signal to the parallel circuit two ends, for alternating current bridge 3 provides sine-wave power～V, control end DO2, the DO1 of digital regulation resistance U4, U5 links to each other with single-chip microcomputer in the instrument respectively, and the cursor slide end of digital regulation resistance U4, U5 is the output voltage vector signal then
Above-mentioned literal has proved absolutely circuit structure of the present utility model, but for ease of measuring and the replacing of popping one's head in, the utility model further improves the physical construction of probe, cooperate shown in Figure 2, the physical construction of probe 2 comprises housing 21, core body 22 and fastening cap 23, magnetic test coil L2 and ancillary coil L1 are assembled in the inner chamber of core body 22, one end of housing 21 is fastening cap 23 fixedly, the connecting line of the output line at 2 circuit two ends and itself and digital regulation resistance U5 cursor slide end of popping one's head in passes and is connected to alternating current bridge 3 by fastening cap 23, and core body 22 is nested with in housing 21 and show out the test side.
Owing to the improper error that causes of instrumentation, the stage clip 24 of adjustment can be set between core body 22 and housing 21 also when measuring for eliminating as far as possible.Wherein, housing 21 inwalls are to projecting inward formation inner convex platform, and core body 22 outer walls outwards protrude the formation outer lug boss, and the two ends of stage clip 24 are against on inner convex platform and the outer lug boss.When measuring, just can the probe flat end be reached fully stably with tested metal flat contact like this, improve the accuracy of measurement result by the elasticity of stage clip 24.
Above-mentioned housing 21 can be column, a temperature sensor 25 also is installed in core body 22 to link to each other with single-chip microcomputer by amplifying circuit, gather the temperature signal of tested metallic conductor, after single-chip microcomputer carries out data processing, the conductivity metal value that records is carried out the temperature correction-compensation.
Principle of work of the present utility model is: the sine-wave power that ac-excited power supply 1 produces is added in magnetic test coil L2, ancillary coil L1 sequential circuit two ends, and magnetic test coil L2 promptly is loaded with exchange current.When probe 2 when the tested metallic conductor, the magnetic field that exchange current produces in the magnetic test coil L2 can make tested metallic conductor generate eddy current, and the counter magnetic field of eddy current changes the impedance of magnetic test coil L2.According to eddy current impedance analysis method, with reference to figure 5, impedance normalization figure for magnetic test coil L2, its transverse axis is represented the resistance variations after the magnetic test coil L2 normalization, the longitudinal axis represents that the induction reactance after the magnetic test coil L2 normalization changes, if the conductivity value of a certain conductor makes the impedance of magnetic test coil L2 meet at the A point of impedance curve OAP, make a straight line AP by the A point to the zero-load impedance point P of magnetic test coil L2, this straight line can be similar to think magnetic test coil lift from the variation line, the impedance point that then has the conductor of same conductivity value and lift from the different magnetic test coil L2 that caused changes and only moves on this straight line, as A ' impedance point.Therefore only there is a corresponding relation in conductivity value with the angle theta A of straight line AP and straight line OP, and with lift from variation and have nothing to do, just can obtain the conductivity value of tested metal thus according to the variation of impedance phase angle θ.By choosing the standard conductor test block of N known conductivity value, the impedance phase of measuring magnetic test coil L2 changes the respective value of angle θ and standard conductivity, through the single-chip data match, the conductivity value that can obtain tested metallic conductor and the standard testing curve of the impedance phase angle of magnetic test coil L2 also are stored in the single-chip microcomputer it for measured value needs afterwards.
With reference to shown in Figure 3, be the apparatus structure block diagram of a complete measurement conductivity metal value, cooperate shown in Figure 4ly, its alternating current bridge employing is integrated with the X9268US of two digital potentiometers, below in conjunction with use the utility model is described in detail.
Before instrument uses, all must return to zero.When instrument returns to zero, to pop one's head in 2 places air, magnetic test coil L2 zero load, the sine-wave power of a certain frequency of ac-excited power supply 1 output of single-chip microcomputer 9 controls, be added in magnetic test coil L2, ancillary coil L1 sequential circuit two ends, in RW0, RW1 two ends output voltage vector
Phase signal enter phase discriminator 7, after being converted to d. c. voltage signal, it is connected to the A/D end of single-chip microcomputer 9, single-chip microcomputer 9 according to the size of magnitude of voltage VR respectively to WP, the SCL of X9268US, SDA end outputting data signals CS1, SCK1, SDC1 to regulate the resistance value of built-in-potential device P0, make the output signal of alternating current bridge 3
Phase differential is zero.Simultaneously, in RW0, RW1 two ends output voltage vector
Amplitude signal input to preposition differential amplifier circuit 4, deliver to the input end of phase-locked amplifying circuit 5 through its amplification, through detection output dc voltage signal, be connected to the A/D end of single-chip microcomputer 9 through low-pass filter circuit 6, single-chip microcomputer 9 is held outputting data signals CS1, SCK1, WP from SDC1 to X9268US, SCL, SDA respectively according to the size of magnitude of voltage, makes the output signal of alternating current bridge 3 with the resistance value of regulating built-in-potential device P1
Amplitude is zero.After phase place and amplitude zeroing, alternating current bridge 3 is in the complete equipilibrium state when zero load.
When using instrument to carry out conductivity measurement, make magnetic test coil L2 end face and tested metallic conductor plane contact in the probe 2.According to eddy current impedance analysis method principle, the alternating current bridge 3 outputs this moment vector voltage relevant with conductivity
, be amplified into phase-locked amplifying circuit 5 through preposition differential amplifier circuit 4, phase-locked amplifying circuit 5 under the control of single-chip microcomputer 9 to vector voltage
Carry out phase sensitive detection, obtain DC voltage V with the OP homophase
01With with the DC voltage V of AP homophase
02, V
01And V
02After low-pass filter circuit 6 filtering, be connected to the A/D end of single- chip microcomputer 9,9 couples of component of voltage V of single-chip microcomputer
01And V
02Use the trigonometric function relation and obtains phasing degree θ A, and obtain conductivity value according to being stored in the conductivity metal value in the single-chip microcomputer 9 and the standard testing curve of magnetic test coil L2 impedance phase angle.Simultaneously, the temperature signal of the tested metallic conductor that the 2 built-in temperature sensors 25 of popping one's head in record inputs to temperature signal buffer amplifier circuit 8, after amplifying, deliver to the A/D end of single-chip microcomputer 9, single-chip microcomputer 9 utilizes this value that the conductivity metal value of being surveyed is carried out the temperature correction-compensation, and revised conductivity metal value and temperature value are inputed to display 10 show, while single-chip microcomputer 9 output sound signals are delivered to acoustic alarm 14 and are sounded a buzzer, and latch the demonstration reading.
Claims (6)
1, the eddy current phase method is measured the pick-up unit in the conductivity metal value instrument, it is characterized in that: comprise probe and alternating current bridge, the probe circuit part is formed by magnetic test coil L2 and ancillary coil L1 serial connection; Alternating current bridge is made up of two digital regulation resistance U4, U5 and four resistance R 1, R2, R3, R4, and resistance R 1, digital regulation resistance U4 are connected in series successively with resistance R 2, and resistance R 3, digital regulation resistance U5 are connected in series successively with resistance R 4; Three sequential circuit parallel connections, and digital regulation resistance U5 cursor slide end is connected in the probe circuit between the magnetic test coil L2 and ancillary coil L1, ac-excited power supply outputs signal to the parallel circuit two ends, the control end of digital regulation resistance U4, U5 links to each other with single-chip microcomputer in the instrument respectively, and the cursor slide end of digital regulation resistance U4, U5 is output voltage signal then.
2, eddy current phase method is according to claim 1 measured the pick-up unit in the conductivity metal value instrument, it is characterized in that: probe also comprises housing, core body and fastening cap, magnetic test coil L2 and ancillary coil L1 are assembled in the inner chamber of core body, one end of housing is fastening cap fixedly, the connecting line of the output line at probe circuit two ends and itself and digital regulation resistance U5 cursor slide end is passed and is connected to alternating current bridge by fastening cap, core body is nested with in housing and show out its test side.
3, measure pick-up unit in the conductivity metal value instrument as the eddy current phase method as described in the claim 2, it is characterized in that: the stage clip that is provided with adjustment between core body and the housing.
4, measure pick-up unit in the conductivity metal value instrument as the eddy current phase method as described in the claim 3, it is characterized in that: inner walls is to projecting inward formation inner convex platform, the core body outer wall outwards protrudes the formation outer lug boss, and the two ends of stage clip are against on inner convex platform and the outer lug boss.
5, measure pick-up unit in the conductivity metal value instrument as the eddy current phase method as described in the claim 2, it is characterized in that: housing is a column.
6, measure pick-up unit in the conductivity metal value instrument as the eddy current phase method as described in the claim 2, it is characterized in that: a temperature sensor that temperature signal can be provided to single-chip microcomputer also is installed in the core body.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200082897U CN201096843Y (en) | 2007-09-18 | 2007-09-18 | Detection device for measuring metal conductivity instrument based on backset phase |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200082897U CN201096843Y (en) | 2007-09-18 | 2007-09-18 | Detection device for measuring metal conductivity instrument based on backset phase |
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| CN201096843Y true CN201096843Y (en) | 2008-08-06 |
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| CNU2007200082897U Expired - Lifetime CN201096843Y (en) | 2007-09-18 | 2007-09-18 | Detection device for measuring metal conductivity instrument based on backset phase |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103293506A (en) * | 2013-06-13 | 2013-09-11 | 爱德森（厦门）电子有限公司 | Achieving method for conductivity measurement instrument without detecting front test block calibration |
| CN104296735A (en) * | 2013-11-29 | 2015-01-21 | 中国航空工业集团公司洛阳电光设备研究所 | Annunciator measurement circuit for dynamically tuned gyroscope |
| CN109668504A (en) * | 2018-10-25 | 2019-04-23 | 合肥工业大学 | A kind of current vortex displacement sensing probe and bridge circuit suitable for strong-electromagnetic field interference |
| CN109813802A (en) * | 2019-03-19 | 2019-05-28 | 浙江省特种设备检验研究院 | A kind of eddy current detection method for the positioning of no reinforcement welding point position while welding |
-
2007
- 2007-09-18 CN CNU2007200082897U patent/CN201096843Y/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103293506A (en) * | 2013-06-13 | 2013-09-11 | 爱德森（厦门）电子有限公司 | Achieving method for conductivity measurement instrument without detecting front test block calibration |
| CN104296735A (en) * | 2013-11-29 | 2015-01-21 | 中国航空工业集团公司洛阳电光设备研究所 | Annunciator measurement circuit for dynamically tuned gyroscope |
| CN109668504A (en) * | 2018-10-25 | 2019-04-23 | 合肥工业大学 | A kind of current vortex displacement sensing probe and bridge circuit suitable for strong-electromagnetic field interference |
| CN109668504B (en) * | 2018-10-25 | 2020-11-17 | 合肥工业大学 | Eddy current displacement sensing probe and bridge circuit suitable for strong electromagnetic field interference |
| CN109813802A (en) * | 2019-03-19 | 2019-05-28 | 浙江省特种设备检验研究院 | A kind of eddy current detection method for the positioning of no reinforcement welding point position while welding |
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Owner name: XIAMEN TIANYAN INSTRUMENT CO., LTD. Free format text: FORMER OWNER: CAI SHENGLI Effective date: 20100511 |
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Free format text: CORRECT: ADDRESS; FROM: 361000 ROOM 601, NO.66, WENPING ROAD, SIMING DISTRICT, XIAMEN CITY, FUJIAN PROVINCE TO: 361000 ROOM 617, VENTURE BUILDING, VENTURE PARK, HUOJU HIGH-TECH ZONE, XIAMEN CITY, FUJIAN PROVINCE |
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Effective date of registration: 20100511 Address after: 361000 room 617, Pioneer Building, pioneer zone, torch hi tech Zone, Xiamen, Fujian Patentee after: Xiamen Research Instrument Co., Ltd. Address before: Siming District of Xiamen city in Fujian province 361000 Ping Road No. 66 Room 601 Patentee before: Cai Shengli |
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Granted publication date: 20080806 |