CN207963758U - A kind of electromagnetic induction thickness measuring system for composite material surface coating layer thickness - Google Patents
A kind of electromagnetic induction thickness measuring system for composite material surface coating layer thickness Download PDFInfo
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- CN207963758U CN207963758U CN201820517876.7U CN201820517876U CN207963758U CN 207963758 U CN207963758 U CN 207963758U CN 201820517876 U CN201820517876 U CN 201820517876U CN 207963758 U CN207963758 U CN 207963758U
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Abstract
The utility model discloses a kind of electromagnetic induction thickness measuring systems for composite material surface coating layer thickness, including probe, signal generating module, signal conditioning circuit and data processing unit；Wherein, it pops one's head in and pops one's head in for variable reluctance, after signal generating module applies pumping signal to it, probe is internal to form magnetic circuit, and the magnetic resistance popped one's head in can be influenced by the magnetic conductivity of institute's contact material；Signal conditioning circuit is to impedance AC signal into horizontal lock enhanced processing, obtain the direct current signal of reflection coating layer thickness, by direct current signal input data processing unit, the digital signal of characterization coating layer thickness is obtained after analog-to-digital conversion, the matched curve between thickness and digital signal is obtained using the data of multigroup known thickness and corresponding digital signals as the linear regression model (LRM) in training data input data processing unit, and then realizes the measurement to thickness.
Description
Technical field
The invention belongs to field of measuring technique, more specifically, are related to a kind of for composite material surface coating layer thickness
Electromagnetic induction thickness measuring system.
Background technology
Radar Absorbing Coating has the function of shielding electromagnetic signal, carries out Radar Absorbing Coating to spray being existing to body surface
For the important technical of opportunity of combat evading radar detecting.With the continuous promotion of opportunity of combat R ＆ D Level, the body of opportunity of combat of new generation
Structure has occurred great change, and the substrate of Radar Absorbing Coating spraying is also therefore gradually from aluminum alloy materials to composite material
It develops.Thickness measuring means are vortexed using tradition, are needed through the current vortex Lift-off effect between probe and conductive base, determine probe with
Thickness between substrate, to which the thickness of coating be determined indirectly.But what opportunity of combat absorption coating thickness measurement technology of new generation faced
Immediate problem is, due to the change of base material, causes to be failed by Lift-off effect formation condition between probe and substrate, coating characteristic
As the principal element of probe impedance is influenced, to make the above-mentioned thickness measuring means based on Lift-off effect no longer be applicable in.In addition, traditional
Magnetic field can easily penetrate composite substrate caused by electromagnetic induction Thicknesser probe excited target, the titanium with fixing composite material
The airframes structure such as alloy generates mutual inductance, and severe jamming is caused to measurement result.Therefore, either from measuring principle still
From existing equipment performance, all it is difficult to meet to carrying out thickness measuring measurement by the absorption coating of substrate of composite material.Due to
The great change of New Fighter base material and housing construction leads to be badly in need of at present new detection device to composite substrate table
Face Radar Absorbing Coating coating layer thickness measures, and is provided for the quality control in New Fighter production and maintenance process applicable
Technical guarantee means.
Currently, the coating thickness measuring method based on electromagnetic induction principle mainly has thickness measuring method based on self-induction type and based on mutual
The thickness measuring method of sense formula.The thickness measuring method of common self-induction type has a variable reluctance thickness measuring, and common mutual inductance type thickness measuring method have it is differential
Transformation thickness measuring and impulse eddy current thickness measuring.When carrying out coating thickness measuring using vortex pulse theory, ac signal incentive probe is utilized
Coil generating electromagnetic field can form the electric current of cycle when probe is close to measured material in measured material.Changes of magnetic field is got over
Soon, induced electromotive force is bigger, and vortex is also stronger.When changes of magnetic field constant airspeed, vortex intensity can be with probe and painting interlayer
Away from diminution and increase.Meanwhile electric field caused by vortex can react on probe and its coil flux amount is made to change and then influence
The equiva lent impedance of probe.When carrying out coating thickness measuring using differential varying-voltage principle, probe and measured material are considered as mutual inductor.Profit
With the mutual inductance phenomenon between probe and measured material, the spacing of measured material and probe is converted to the variable quantity of mutual inductance.But by
Relatively thin in the rich coating of opportunity of combat radar suction, the induced electromotive force that can be formed is smaller, and coated substrate is that non-conductive matrix material cannot
Induced electromotive force is provided, therefore the measurement method based on current vortex or differential transformation and is not suitable for.Dong-June CHOI et al.
The Flexible Inductive Transducer with Magnetic Resistance delivered in 2001 disclose one
Kind variable magnetic-resistance type transducer, the sensor are made of iron-core coil and armature three parts.The inductance of sensor is by magnetic core and armature
Between gap size determine, when armature moves, gap thickness changes, and to make the magnetic resistance in magnetic circuit change, leads
The inductance value of inductance coil is caused to change.Inductance value progress signal condition can be changed into voltage signal, it should by measuring
Voltage value can determine the variation of gap thickness.Using this variable magnetic-resistance type transducer carry out coating thickness measurement when, need with
Substrate location, which is used as, refers to position, and armature position changes because of coating layer thickness difference, causes gap thickness to change, and then obtain not
The corresponding voltage value with coating layer thickness realizes the measurement to coating layer thickness.But when using aircraft surfaces coating as test object,
The position for obtaining coated substrate is difficult to realize, therefore this sensor cannot be used for the survey to body surface coating layer thickness
Amount.In addition, armature to be made to generate mechanical displacement, coating surface certainly will be stressed influence.When coating is relatively thin, stress can be to applying
Layer thickness test result has an impact.Therefore, using the principle by mechanical displacement realization magnetic resistance change rate as opportunity of combat coating thickness measuring
Technological means there are still the difficulties for being difficult to overcome.
Invention content
The purpose of the utility model is to overcome the deficiencies in the prior art, provide a kind of for composite material surface painting thickness
The electromagnetic induction thickness measuring system of degree is realized using electromagnetic induction measure thickness principle to composite material base bottom surface absorption coating
Thickness measure, interference of the metal structure contacted with substrate to test result is avoided from measuring principle.
For achieving the above object, a kind of electromagnetic induction for composite material surface coating layer thickness of the utility model is surveyed
Thick system, which is characterized in that including：
One probe, including magnetic core, coil, shell and sliding slot；The magnetic core uses open C type, is twined in the periphery of magnetic core
Coiling, coil are connected through conducting wire with the balanced bridge in signal conditioning circuit；Magnetic core and coil are used by embedding processing mode
Non-magnetic Embedding Material is fixed inside the housing, and outer casing bottom is smooth, and non-magnetic Embedding Material reveals completely in outer casing bottom
Go out, shell exterior is equipped with guide frame, and guide frame is fixed on any position in sliding slot track by expanding knob, makes probe
The position that shell can be adjusted according to the geometry of measurand, to obtain the impedance variations voltage caused by coating layer thickness
Signal；
One signal generating module is connected with the balanced bridge in signal conditioning circuit；Signal generating module is by balancing electricity
Bridge applies sinusoidal excitation signal to coil, pops one's head under the action of sinusoidal excitation signal, and the formation of internal magnetic core is opened by magnetic core
The closed magnetic circuit that mouth gap portion and core portion are constituted；
One signal conditioning circuit, including balanced bridge and lock-in amplifier, wherein lock-in amplifier includes differential amplification again
Module, input amplification module, phase-sensitive detector and low-pass filter；
Probe impedance variation voltage signal leads to sound end in balanced bridge and directly provides excitation by signal generating module
Potential difference is formed between the reference edge of signal, to make balanced bridge get the impedance variations voltage signal and balance electricity of probe
Differential signal between bridge reference edge；Differential signal is input to differential amplification module, obtains the electricity of characterization probe impedance variation
Pressure difference sub-signal Δ U；Signal generating module provides signal U identical with voltage differential signal Δ U frequencies again, and is input to input
Amplification module, then by phase-sensitive detector to Δ U and U into after horizontal lock enhanced processing, be filtered by low-pass filter
Afterwards, the direct current signal U of reflection probe impedance variation is obtainedout；
One data processing unit, by direct current signal UoutBe AD converted with coating layer thickness complementary operation, finally calculate painting
Layer thickness value.
What the purpose of utility model of the present invention was realized in：
The utility model is a kind of electromagnetic induction thickness measuring system for composite material surface coating layer thickness, including pop one's head in,
Signal generating module, signal conditioning circuit and data processing unit；Wherein, it pops one's head in and pops one's head in for variable reluctance, when mould occurs for signal
After block applies pumping signal to it, probe is internal to form magnetic circuit, and the magnetic resistance popped one's head in can be by the magnetic conductivity shadow of institute's contact material
It rings.The magnetic conductivity of material is influenced by self character and magnetic circuit cross section size.When measured material is unique, magnetic conductivity is by magnetic circuit cross
Cross-sectional sizes determine.When the coating of probe contacts different-thickness, different inductance responses can be obtained, these variation inductance are final
As impedance AC signal input signal conditioning module.Signal conditioning circuit to impedance AC signal into horizontal lock enhanced processing,
Obtain the direct current signal of reflection coating layer thickness.By direct current signal input data processing unit, characterized after analog-to-digital conversion
The digital signal of coating layer thickness, using the data of multigroup known thickness and corresponding digital signals as the processing of training data input data
Linear regression model (LRM) in unit obtains the matched curve between thickness and digital signal, and then realizes the measurement to thickness.
Meanwhile a kind of electromagnetic induction thickness measuring system for composite material surface coating layer thickness of the utility model also have with
Lower advantageous effect：
(1), the magnetically confined for generating probe from measuring principle is avoided and is contacted with substrate within the scope of coating
Interference of the metal structure to test result.
(2), coating layer thickness is measured using contact method, improves the flexibility of test, can realized to flying
The quick detection of each portion faces coating of machine.
(3), when coating relatively thin (hundreds of microns), the measurement result of coating layer thickness, phase can be influenced by applying stress to coating
Compared with the variable-reluctance transducer for changing magnetic resistance by mechanical displacement, probe proposed by the present invention avoids stress pair to greatest extent
The interference of coating layer thickness test result.
Description of the drawings
Fig. 1 is a kind of electromagnetic induction thickness measuring system schematic diagram for composite material surface coating layer thickness of the utility model；
Fig. 2 is the schematic diagram of measured piece；
Fig. 3 is sonde configuration schematic diagram shown in Fig. 1；
Fig. 4 is the operation principle schematic diagram of probe；
Fig. 5 is the circuit diagram of electromagnetic induction thickness measuring system of the present invention.
Specific implementation mode
The specific implementation mode of the present invention is described below in conjunction with the accompanying drawings, preferably so as to those skilled in the art
Understand the present invention.Requiring particular attention is that in the following description, when known function and the detailed description of design perhaps
When can desalinate the main contents of the present invention, these descriptions will be ignored herein.
Embodiment
Fig. 1 is a kind of electromagnetic induction thickness measuring system schematic diagram for composite material surface coating layer thickness of the utility model.
In the present embodiment, the face coat of the measured piece 14 of selection be 15 structure of absorption coating as shown in Fig. 2, by
It is 100 microns, 200 microns, 300 microns, 400 microns, 500 microns, one group of 600 micron thickness that survey part 14, which include coating layer thickness,
The exemplar of standard component and a range of coat thicknesses at 200 to 300 microns.Substrate is carbon fibre composite；
As shown in figure 3, probe includes magnetic core 5, coil 6, shell 7 and sliding slot 8；Wherein, magnetic core 5 uses open C type, by
Nickel-zinc ferrite is made；In the peripheral wound around coil 6 of magnetic core 5, coil 6 is through flat in conducting wire 11 and signal conditioning circuit
The electric bridge that weighs is connected；Magnetic core 5 and coil 6 are fixed inside the housing by embedding processing mode non-magnetic Embedding Material 13, shell
Bottom be it is smooth, non-magnetic Embedding Material 13 is completely exposed in outer casing bottom, shell for shield except with coating layer touch face with
Magnetic field in outside direction, shell exterior are equipped with guide frame 12, and guide frame 12 is fixed on by expanding knob in sliding slot track
Any position, enable probe according to the geometry of measurand adjust shell 7 position, to obtain because of coating layer thickness
Caused impedance variations voltage signal；
Signal generating module is connected with the balanced bridge in signal conditioning circuit；Signal generating module passes through balanced bridge
Sinusoidal excitation signal is applied to coil, is popped one's head under the action of sinusoidal excitation signal, the formation of internal magnetic core is open by magnetic core
The closed magnetic circuit that gap portion and core portion are constituted；As shown in figure 4, the closure that probe is formed after being contacted with absorption coating
Magnetic circuit has been constrained in inside measured piece well, and magnetic resistance of popping one's head in changes with coating layer thickness and changed.
Signal conditioning circuit, including balanced bridge and lock-in amplifier, wherein lock-in amplifier includes differential amplification mould again
Block, input amplification module, phase-sensitive detector and low-pass filter；
As shown in figure 5, probe impedance variation voltage signal cause in balanced bridge sound end with it is straight by signal generating module
Connect provide pumping signal reference edge between form potential difference, to make balanced bridge get probe impedance variations voltage letter
Differential signal number between balanced bridge reference edge；Differential signal is input to differential amplification module, obtains characterization probe resistance
The voltage differential signal Δ U of resistance；Signal generating module provides signal U identical with voltage differential signal Δ U frequencies again, and
Be input to input amplification module, then by phase-sensitive detector to Δ U and U into after horizontal lock enhanced processing, pass through low-pass filtering
After device is filtered, the direct current signal U of reflection probe impedance variation is obtainedout；
Data processing unit, by direct current signal UoutBe AD converted with coating layer thickness complementary operation, finally calculate coating
Thickness value.
Although the illustrative specific implementation mode of the present invention is described above, in order to the technology of the art
Personnel understand the present invention, it should be apparent that the present invention is not limited to the range of specific implementation mode, to the common skill of the art
For art personnel, if various change the attached claims limit and determine the spirit and scope of the present invention in, these
Variation is it will be apparent that all utilize the innovation and creation of present inventive concept in the row of protection.
Claims (3)
1. a kind of electromagnetic induction thickness measuring system for composite material surface coating layer thickness, which is characterized in that including：
One probe, including magnetic core, coil, shell and sliding slot；The magnetic core uses open C type, in the periphery winding line of magnetic core
Circle, coil are connected through conducting wire with the balanced bridge in signal conditioning circuit；Magnetic core and coil are led by embedding processing mode with non-
Magnetic Embedding Material is fixed inside the housing, and outer casing bottom is smooth, and non-magnetic Embedding Material is completely exposed in outer casing bottom, outside
Guide frame is housed, guide frame is fixed on any position in sliding slot track by expanding knob, enables probe outside shell
The position that shell is adjusted according to the geometry of measurand is believed to obtain the impedance variations voltage caused by coating layer thickness
Number；
One signal generating module is connected with the balanced bridge in signal conditioning circuit；Signal generating module passes through balanced bridge pair
Coil applies sinusoidal excitation signal, pops one's head under the action of sinusoidal excitation signal, internal to form closed magnetic circuit；
One signal conditioning circuit, including balanced bridge and lock-in amplifier, wherein lock-in amplifier includes differential amplification mould again
Block, input amplification module, phase-sensitive detector and low-pass filter；
Probe impedance variation voltage signal leads to sound end in balanced bridge and directly provides pumping signal by signal generating module
Reference edge between form potential difference, join with balanced bridge to make balanced bridge get the impedance variations voltage signal of probe
Examine the differential signal between end；Differential signal is input to differential amplification module, obtains the voltage difference of characterization probe impedance variation
Sub-signal Δ U；Signal generating module provides signal U identical with voltage differential signal Δ U frequencies again, and is input to input amplification
Module, then by phase-sensitive detector to Δ U and U into after horizontal lock enhanced processing, after being filtered by low-pass filter, obtain
To the direct current signal U of reflection probe impedance variationout；
One data processing unit, by direct current signal UoutBe AD converted with coating layer thickness complementary operation, finally calculate painting thickness
Angle value.
2. a kind of electromagnetic induction thickness measuring system for composite material surface coating layer thickness according to claim 1, described
Closed magnetic circuit be made of magnetic core opened gap part and core portion.
3. a kind of electromagnetic induction thickness measuring system for composite material surface coating layer thickness according to claim 1, described
Magnetic core be made by nickel-zinc ferrite.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820517876.7U CN207963758U (en) | 2018-04-12 | 2018-04-12 | A kind of electromagnetic induction thickness measuring system for composite material surface coating layer thickness |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820517876.7U CN207963758U (en) | 2018-04-12 | 2018-04-12 | A kind of electromagnetic induction thickness measuring system for composite material surface coating layer thickness |
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| Publication Number | Publication Date |
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| CN207963758U true CN207963758U (en) | 2018-10-12 |
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| CN201820517876.7U Withdrawn - After Issue CN207963758U (en) | 2018-04-12 | 2018-04-12 | A kind of electromagnetic induction thickness measuring system for composite material surface coating layer thickness |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108692650A (en) * | 2018-04-12 | 2018-10-23 | 电子科技大学 | A kind of electromagnetic induction thickness measuring system for composite material surface coating layer thickness |
| CN110261731A (en) * | 2019-06-03 | 2019-09-20 | 清华大学 | A kind of more transmission line parameter measurement methods based on current field |
| CN111256574A (en) * | 2020-03-25 | 2020-06-09 | 北京理工大学 | Method and system for measuring thickness of metal pipeline |
| CN112880542A (en) * | 2021-01-06 | 2021-06-01 | 北京航空航天大学 | Method and system for rapidly detecting thickness and conductivity of ultrathin metal coating |
-
2018
- 2018-04-12 CN CN201820517876.7U patent/CN207963758U/en not_active Withdrawn - After Issue
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108692650A (en) * | 2018-04-12 | 2018-10-23 | 电子科技大学 | A kind of electromagnetic induction thickness measuring system for composite material surface coating layer thickness |
| CN108692650B (en) * | 2018-04-12 | 2019-08-20 | 电子科技大学 | A kind of electromagnetic induction thickness measuring system for composite material surface coating layer thickness |
| CN110261731A (en) * | 2019-06-03 | 2019-09-20 | 清华大学 | A kind of more transmission line parameter measurement methods based on current field |
| CN111256574A (en) * | 2020-03-25 | 2020-06-09 | 北京理工大学 | Method and system for measuring thickness of metal pipeline |
| CN111256574B (en) * | 2020-03-25 | 2021-01-01 | 北京理工大学 | Method and system for measuring thickness of metal pipeline |
| CN112880542A (en) * | 2021-01-06 | 2021-06-01 | 北京航空航天大学 | Method and system for rapidly detecting thickness and conductivity of ultrathin metal coating |
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Granted publication date: 20181012 Effective date of abandoning: 20190820 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20181012 Effective date of abandoning: 20190820 |
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