CN106404843B - Four-point automatic adjusument non-destructive control probe based on electrical measurement - Google Patents
Four-point automatic adjusument non-destructive control probe based on electrical measurement Download PDFInfo
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- CN106404843B CN106404843B CN201610801515.0A CN201610801515A CN106404843B CN 106404843 B CN106404843 B CN 106404843B CN 201610801515 A CN201610801515 A CN 201610801515A CN 106404843 B CN106404843 B CN 106404843B
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- electrode
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- measurement
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
Abstract
The present invention provides a kind of four-point automatic adjusument non-destructive control probe based on electrical measurement, and the identical fixed electrode of three of the detection probe is uniformly distributed in the intracorporal circumferencial direction of shell, is used as measuring electrode；Float electrode is located at the center of shell, is used as excitation electrode, is dielectrically separated between four electrodes by packing material, and four electrodes are connect by conducting wire with external display instrument.Beneficial effect be the detection probe can satisfy plane, concave surface, convex surface part different measurement demands.The center-driven electrode of probe is movable structure, can automatically adjust probe height according to measured material surface shape, realize the good fit of probe with measured material, improve probe using flexible.According to the electrology characteristic of surveyed inter-electrode impedance and measured material.Suitable for the nondestructive inspection of weak inductive material members, measurement conductivity is 100000S/m material below, and overall structure of popping one's head in is simple, easy to operate, practical.
Description
Technical field
The invention belongs to non-electrical conducting material technical field of nondestructive testing, more particularly to certain electric conductivity and have compared with
A kind of four-point automatic adjusument non-destructive control probe based on electrical measurement of the composite panel of small radian.
Background technique
Novel carbon fiber composite is widely used in the large scale equipments such as aircraft, steamer.Since material is manufacturing and its is making
With different type damage and defect is likely to occur in the process, timely and effectively material is realized and is early diagnosed, to its damage tolerance
It is rationally assessed, is to guarantee to use safe important channel.Currently, the lossless detection method being widely used have thermal imaging method,
Ultrasound detection, eddy current detection, scanning acoustic microscope, X-ray detection etc..
Electrical detection is compared with above-mentioned detection method, with nontoxic, radiationless, structure is simple, portable, adaptable, inspection
Survey the advantages that range is wide.When carbon fibre composite there are crackle, degumming, layering, Inner extrusion deformation, liquid penetrate into the defects of
When, conductivity or equivalent relative dielectric constant will also change.Different from metal material, the conductivity of composite material is very
It is small, it is difficult to using conventional eddy current detection method.
Electrical detection method measures tested composite regions because of conductance caused by structural damage using probe (or electrode)
The variation of rate and/or dielectric constant.Measuring probe (or electrode) generally has the shapes such as bipolar electrode, four electrodes and array electrode
Formula, these methods have its shortcoming.
Certain conductive material electrical testing instrument are only applicable to fixed shaped materials detection, measurement essence using double probe structures
It spends lower, and is mostly used for laboratory measurement.
More accurate conductivity measurement is frequently with four electrode structures.Electrode position is accurately positioned, and passes through conductive silver
Slurry links together with measured material, guarantees that good fit, measurement result are accurate and reliable.This method is chiefly used in laboratory measurement,
It is poorly suited for use in actual production environment.
Array multielectrode sensor has also come out, but its electrode number is excessive, general much in nine electrodes.It is surveying
When measuring non-planar material, partial electrode cannot have gap and be formed with measured material good fit.The gap can be equivalent to electricity
Hold, this will lead to the increase of contact impedance between sensor and measured material (for example, if circular electrode radius is 2.5mm, sensing
The capacitor of a 0.017pF can be equivalent between device and material if the gap for having 1mm).If all electrodes are both designed as activity
Electrode then constructs complexity and increases the volume of probe.
In order to make electrode and measured material good fit, all electrodes in array multielectrode sensor can all be used conduction
Silver paste is fixed.Although can be formed to avoid gap between the two so that measurement data it is more accurate, due to electrode with
Measured material is fixed together, and will affect the subsequent use of measured material.So being generally used for experimental study use, it is difficult to for real
The production link on border.
Summary of the invention
In view of the deficiencies of the prior art, the present invention proposes a kind of, and the four-point automatic adjusument based on electrical measurement is lossless
Detection probe can not only meet convenient, flexible requirement, but also can guarantee that on measured material surface be plane, micro-concave surface or dimpling
When face, all electrodes and measured material surface being capable of good fits.
To achieve the above object, the technical solution adopted by the present invention is that provide a kind of four-point based on electrical measurement adaptive
Non-destructive control probe should be adjusted, in which: the detection probe include there are three identical fixed electrode, a float electrode, shell,
Conducting wire, packing material, three identical fixed electrodes are uniformly distributed in the intracorporal circumferencial direction of shell, are used as measuring electrode；Activity
Electrode is located at the center of shell, is used as excitation electrode, is dielectrically separated between four electrodes by packing material, four electrodes
It is connect by conducting wire with external display instrument；The float electrode is that inside is equipped with spring, makes the telescopic length of float electrode
Adjustable electrode.
Effect of the invention is the detection probe:
(1) can satisfy plane, concave surface, convex surface part different measurement demands.The center-driven electrode of probe is activity
Formula structure can automatically adjust probe height, realize the good fit of probe with measured material according to measured material surface shape,
Improve probe using flexible.It can guarantee electrode and measured material good surface contact, be suitable for plane, micro-concave surface, dimpling face
Material, structure are simple.It is not necessary that it is more quick, flexible to hold measurement by electrode and measured material surface mount.
(2) this probe can measure weak inductive material, also can measure stronger conductive material；Conductivity, which can be measured, is
100000S/m material below.
(3) form six bridge arm electric bridges after this probe and external resistance matches, six bridge arms can combination of two, form 3 allusion quotations
4 arm electric bridges of type.Due to good contact, the gap of electrode and measured surface is eliminated, reduces additional connect as much as possible
Touching impedance greatly improves measurement accuracy compared with fixed multiple electrode array sensor.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of detection probe of the present invention；
Fig. 2 is the A direction view of Fig. 1；
Fig. 3 is sectional view of the present invention probe in the direction B-B shown in Fig. 2；
Fig. 4 is six bridge resistance instrumentation plans of the invention；
Fig. 5 is one schematic diagram of the embodiment of the present invention；
Fig. 6 is the probe schematic diagram of the embodiment of the present invention one；
Fig. 7 is the probe schematic diagram of the embodiment of the present invention two；
Equivalent impedance figure when Fig. 8 is measurement of the embodiment of the present invention.
In figure:
1, fixed electrode 4, float electrode 5, shell 6, conducting wire
7, packing material 8, radome of fighter
Specific embodiment
In conjunction with attached drawing to the four-point automatic adjusument non-destructive control probe structure of the invention based on electrical measurement make into
One step explanation:
Four-point automatic adjusument non-destructive control probe based on electrical measurement of the invention, which includes three
A identical fixed electrode 1, float electrode 4, shell 5, conducting wire 6, a packing material 7, three identical fixed electrodes 1 are in shell
Circumferencial direction in body 5 is uniformly distributed, and is used as measuring electrode；Float electrode 4 is located at the center of shell 5, is used as excitation electrode, institute
It states and is dielectrically separated between four electrodes by packing material 7, four electrodes are connect by conducting wire 6 with external display instrument.It is described
Float electrode 4 inside be equipped with spring, keep the telescopic length of float electrode 4 adjustable.
Four-point automatic adjusument non-destructive control probe function based on electrical measurement of the invention is achieved in that
As shown in Figure 1, three of the four-point automatic adjusument non-destructive control probe of the invention based on electrical measurement are solid
Fixed electrode 1 is uniformly distributed in circumferencial direction, and a float electrode 4 is located at the center of circle.There are spring structure, spring knot in float electrode 4
Structure makes float electrode 4 have the function of adjusting upper and lower position.Four electrodes are embedded in shell 5, and only top sub-fraction is revealed
Out, four electrodes form the structure of dimpling, as shown in Figure 3.Three fixed electrodes 1 can with measured material good surface contact,
Float electrode 4 can voluntarily adjust extension elongation according to the concave-convex situation of material surface, to well contact with measured surface.
As shown in figure 4, float electrode 4 and the interelectrode electrical model of any fixation can be equivalent to a resistance and capacitor
Parallel-connection structure, impedance areFor the material of weak inductive, driving source is motivated using high-frequency ac, and four electrodes are equal
Using large area structure, adjacent electrode spacing is small, and capacitor is occupied an leading position at this time, as shown in Figure 2.And for stronger electric conductivity
Material, driving source are motivated using low-frequency ac, and four electrodes are all made of small area structure, and adjacent electrode spacing is big, at this time resistance
It occupies an leading position.A conducting wire 6 is respectively drawn from four electrode other ends, four conducting wires are twisted into a root surface inside shell 5
It is covered with the multicore cable of shielded layer, is finally drawn out of shell 5, is connected to display instrument.
After the detection probe can be equivalent to three impedances, with external resistance matches, it may make up six bridge arm electric bridges.Six bridges
Arm can combination of two, formed 3 typical 4 arm electric bridges.When measurement, inswept tested region of popping one's head in, exciting current is from central movable
Electrode 4 flows out, and then passes through measured material, then form closed circuit through three identical fixed electrodes 1.Utilize differential amplifier circuit
The impedance value between three identical fixed electrodes 1 and float electrode 4 is measured, and shows corresponding voltage in the display
Numerical value, U1,U2,U3.Measure three voltage values are compared with the voltage value that standard component records, if corresponding voltage numerical value
Between without obvious gap, illustrate that measured material is intact；But if it was found that gap is larger between corresponding voltage numerical value,
It then may infer that damage or defect occurs in measured material.Electroimpedance non-destructive testing for carbon fibre composite is visited
Head selects measurand of the radome of fighter 8 as embodiment one, and its electric conductivity is weaker.Using high frequency pumping source, large area
Electrode probe, as shown in Figure 5.Because radome of fighter is dimpling plane materiel material, when test, the float electrode 4 of center probe can be received
Contracting, three fixed electrodes 1 and a float electrode 4 can be fitted closely with radome at this time.As shown in Figure 6.Four electrodes at this time
Between the impedance of measured material can be equivalent at three electrical impedance, as shown in Figure 8.After external resistance matches, it may make up six bridges
Arm electric bridge.When measurement, inswept tested region of popping one's head in, exciting current be therefrom indecisive and changeable moving electrode 4 outflow, then pass through measured material,
Closed circuit is formed through three fixed electrodes 1 again.Radome of fighter 8 it is equivalent at three electrical impedance and external resistance matches after,
It may make up six bridge arm electric bridges.Six bridge arms can combination of two, form 3 typical 4 arm electric bridges.It is measured using differential amplifier circuit
Three direction impedance values, and corresponding voltage value U is shown in the display1,U2,U3.By measure three voltage values
It is compared with the voltage value of standard component record, if illustrating that measured material is without obvious gap between corresponding voltage numerical value
It is intact；But if it was found that gap is larger between corresponding voltage numerical value, then may infer that measured material occur damage or
Person's defect.
The material for selecting electric conductivity slightly strong is the measurand of embodiment two.Low-frequency excitation source, small area electricity are used at this time
Pole probe, as shown in Figure 7.Measurement method is similar with embodiment one.
Claims (1)
1. a kind of four-point automatic adjusument non-destructive control probe based on electrical measurement, it is characterized in that: the detection probe includes
There are three identical fixed electrode (1), a float electrode (4), shell (5), conducting wires (6), packing material (7), and three identical
Circumferencial direction of the fixation electrode (1) in shell (5) be uniformly distributed, be used as measuring electrode；Float electrode (4) is located at shell
(5) center is used as excitation electrode, between the float electrode (4) and fixed electrode (1) by packing material (7) insulation every
From four electrodes are connect by conducting wire (6) with external display instrument；The float electrode (4) is that inside is equipped with spring, makes to live
The adjustable electrode of telescopic length of moving electrode (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610801515.0A CN106404843B (en) | 2016-09-05 | 2016-09-05 | Four-point automatic adjusument non-destructive control probe based on electrical measurement |
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| CN201610801515.0A CN106404843B (en) | 2016-09-05 | 2016-09-05 | Four-point automatic adjusument non-destructive control probe based on electrical measurement |
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| CN106404843A CN106404843A (en) | 2017-02-15 |
| CN106404843B true CN106404843B (en) | 2019-01-25 |
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| CN109030581B (en) * | 2018-07-04 | 2024-04-16 | 南京铁道职业技术学院 | Composite construction's pantograph carbon slide surface damage detects and uses charge converter |
| CN109946477B (en) * | 2019-01-30 | 2020-06-12 | 北京师范大学 | Liquid flow velocity measuring device and method based on electrochemical response of conductive electrode |
| CN111579604B (en) * | 2020-05-20 | 2023-12-05 | 中国民航大学 | Rotatable planar capacitance tomography sensor |
| CN112179948B (en) * | 2020-09-29 | 2024-04-12 | 中国航发动力股份有限公司 | Flaw detection device and application thereof |
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| CN1617753A (en) * | 2001-11-29 | 2005-05-18 | 冲击动力股份有限公司 | Sensing of pancreatic electrical activity |
| CN102539497A (en) * | 2010-12-09 | 2012-07-04 | 中国科学院金属研究所 | Variable-diameter rotating ring electrode |
| CN103001532A (en) * | 2012-11-28 | 2013-03-27 | 上海交通大学 | Surface-mounted longitudinal and torsion modal compound ultrasonic motor |
| CN105553326A (en) * | 2015-12-15 | 2016-05-04 | 上海交通大学 | Low-voltage drive piezoelectric micromotor |
| CN105572177A (en) * | 2014-11-05 | 2016-05-11 | 敦煌研究院 | Nondestructive testing device for water vapor distribution in ancient mural painting support bodies |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009013190A1 (en) * | 2007-07-21 | 2009-01-29 | Boehringer Ingelheim International Gmbh | Apparatus and method for determining the moisture content of a packaging material |
| CA2943564C (en) * | 2014-03-28 | 2020-07-21 | Openfield | Probe, sonde and method for producing signals indicative of local phase composition of a fluid flowing in an oil well |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1617753A (en) * | 2001-11-29 | 2005-05-18 | 冲击动力股份有限公司 | Sensing of pancreatic electrical activity |
| CN102539497A (en) * | 2010-12-09 | 2012-07-04 | 中国科学院金属研究所 | Variable-diameter rotating ring electrode |
| CN103001532A (en) * | 2012-11-28 | 2013-03-27 | 上海交通大学 | Surface-mounted longitudinal and torsion modal compound ultrasonic motor |
| CN105572177A (en) * | 2014-11-05 | 2016-05-11 | 敦煌研究院 | Nondestructive testing device for water vapor distribution in ancient mural painting support bodies |
| CN105553326A (en) * | 2015-12-15 | 2016-05-04 | 上海交通大学 | Low-voltage drive piezoelectric micromotor |
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Granted publication date: 20190125 Termination date: 20190905 |