CN109141325A - The contactless measurement and device of metal surface coated layer thickness - Google Patents
The contactless measurement and device of metal surface coated layer thickness Download PDFInfo
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- CN109141325A CN109141325A CN201811074878.4A CN201811074878A CN109141325A CN 109141325 A CN109141325 A CN 109141325A CN 201811074878 A CN201811074878 A CN 201811074878A CN 109141325 A CN109141325 A CN 109141325A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
- G01B21/08—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness for measuring thickness
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
- G01B11/026—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness by measuring distance between sensor and object
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
- G01B7/023—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring distance between sensor and object
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- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Abstract
A kind of contactless measurement and device of metal surface coated layer thickness, accordingly select non-contact turbulent flow detection probe to be demarcated according to test specimen size to be measured, ranging model is vortexed to obtain eddy current signal and the relation curve of corresponding lift off and establish test specimen metallic matrix to be measured, the eddy current signal of current vortex sensor is obtained in the detection process, according to test specimen metallic matrix to be measured be vortexed ranging model be calculated metallic matrix vortex central point to eddy current probe end face distance, and coated layer outer surface central point in vortex is further measured to laser range sensor group light projector point place plane according to laser range sensor group, detect the distance of plane π, metal base surface coated layer thickness is finally calculated.The present invention can be realized reliable and stable lossless non-contact detection, and data processing method is simple, and on-line checking easy to implement is to save a large amount of economic cost and time.
Description
Technical field
It is specifically a kind of to be based on current vortex sensor and laser the present invention relates to a kind of technology of field of machining
The contactless measurement and device of the metal surface coated layer thickness of distance measuring sensor.
Background technique
In engineer application, in order to increase canister and pipeline resistance to burning, it is anticorrosive it is new can, usually in its inner surface or
Paste or spray resistance to ablation, corrosion resistant nonmetallic materials in person outer surface.Feature of the thickness of these coatings to entire test specimen
Analysis, quality control, working performance and its stability, reliability and service life all play extremely important effect.
Existing coated layer thickness lossless detection method is magnetic thickness measuring method, ultrasonic thickness measurement method, thickness measurement with laser method and whirlpool
Flow thickness measuring method.In these methods, vortex thickness measuring with do not need couplant, high sensitivity, structure it is simple, not by degreasing medium shadow
The advantages that sound, fast and easy to automate detection speed, is widely used, and is commonly used in the coated layer of planar metal matrix surface
In thickness measure, probe is close to coating layer surface in measurement process, the lift off of probe is coated layer thickness, this side
Method is generally used for the measurement of dry coating, substantially contact type measurement, sometimes results in coating surface damage, and for curved surface base
Body, finally obtained thickness value include datum offset caused by curvature.
Summary of the invention
The present invention In view of the above shortcomings of the prior art, proposes a kind of the contactless of metal surface coated layer thickness
Measurement method and device.
The present invention is achieved by the following technical solutions:
It is big according to sample dimensions to be measured the present invention relates to a kind of contactless measurement of metal surface coated layer thickness
It is small accordingly to select non-contact turbulent flow detection probe to be demarcated, to obtain the pass of eddy current signal with corresponding lift off
It is curve and establishes test specimen metallic matrix vortex ranging model to be measured, obtains the vortex letter of current vortex sensor in the detection process
Number, ranging model is vortexed according to test specimen metallic matrix to be measured, metallic matrix vortex central point is calculated to eddy current probe end
The distance in face, and coated layer outer surface central point in vortex is further measured according to laser range sensor group and is passed to laser ranging
Plane where sensor group light projector point detects the distance of plane π, metal base surface coated layer thickness is finally calculated.
The non-contact turbulent flow detection probe uses but is not limited to shielding probe.
Described accordingly selects eddy current probe according to test specimen size to be measured: when measured surface is plane,
Centered on the point of face center probe line, tested surface diameter should be greater than 1.5 times of probe head diameter or more；Work as measured surface
For column cylindrical body arc-shaped surface and center probe line orthogonal with axial line when, generally require cylinder diameter be probe diameter
3 times or more.
The calibration refers to: changing a lift off every 0.1mm, obtains the currents sensing under different lift offs
The eddy current signal of device output, i.e. voltage or current analog quantity；By multimodal Gauss curve fitting function to eddy current signal and lift-off away from
From being demarcated, test specimen metallic matrix vortex ranging model to be measured, multimodal Gaussian curve are established are as follows:Its
In: ai、bi、ciFor constant, x is eddy current signal, and y is calibrated lift off.
The calibration carries out the detection of eddy current signal again after preferably being preheated to eddy current sensor, to reduce ring
Influence of the border temperature to measurement result.
The relation curve refers to: voltage or the eddy current signal of current forms function corresponding with practical lift off close
System.
The test specimen metallic matrix to be measured is vortexed ranging model using the eddy current signal of test specimen to be measured as input, actually mentions
Separation is from as output.
The metallic matrix vortex central point refers to: metallic matrix/coated layer interface, specifically: work as current vortex
When probe is loaded with sine-wave current excitation coil close to metallic matrix surface of test piece, because of the shadow by alternating magnetic field around coil
It rings, produces vortex in test specimen inside to be measured, this area surfaces central point, its corresponding distance for arriving eddy current probe end face,
It is calculated in metallic matrix vortex especially by current vortex sensor acquisition eddy current signal and after substituting into vortex ranging model
Heart point is to eddy current probe end face distance.
The distance of plane where the coated layer outer surface central point to laser range sensor group light projector point, according to sharp
Outside the contact point of ligh-ranging sensor light projector axis and coating layer surface, the i.e. distance of characteristic point and metallic matrix vortex coated layer
Centre of surface point is obtained to the distance of detection plane π by three point one side mode approximations, wherein detection plane π and current vortex are visited
End surface distance is definite value.
The metal base surface coated layer thickness, passes through metallic matrix vortex central point to eddy current probe end face
Distance subtract matrix vortex coated layer outer surface central point to detection plane π distance and detection plane π and current vortex
The distance of sensor probe end face obtains.
The present invention relates to a kind of systems for realizing the above method, comprising: non-contact turbulent flow detection probe and around its
Three laser range sensors being arranged, in which: three laser range sensors are symmetrically disposed on current vortex biography in 120 ° of angles
Output metallic matrix vortex coated layer centre of surface point simultaneously is detected to the distance for detecting plane π, in conjunction with current vortex in sensor periphery
Metal surface coated layer thickness is calculated in the eddy current signal of sensor output.
Technical effect
Compared with prior art, it is big, smart to solve Curved surface metal matrix range error by vortex ranging model by the present invention
Spend low problem；Approximate measure face is constituted using three laser range sensors, in metal base surface coating thickness measuring
In the process, it can be realized reliable and stable lossless non-contact detection, and data processing method is simple, on-line checking easy to implement
To save a large amount of economic cost and time.
Detailed description of the invention
Fig. 1 is examples measure device circuit structural block diagram；
Fig. 2 is measuring device schematic diagram constructed by embodiment；
Fig. 3 is the vortex ranging model calibration flow chart that the present invention uses；
Fig. 4 is the vortex range measurement principle schematic diagram that the present invention uses；
Fig. 5 is embodiment laser range sensor group range measurement principle schematic diagram.
Specific embodiment
As depicted in figs. 1 and 2, a kind of cylinder heat insulation layer thickness on-line measurement device being related to for the present embodiment, wherein wrapping
Contain: the master control of current vortex sensor 1, laser range sensor group 2 and the built-in ARM chip circuit being attached thereto respectively calculates son
System 3, in which: the displacement signal line for acquiring sensor is equipped between current vortex sensor 1 and master control computing subsystem 3
Property, after normalized, directly export the transmitter of 4~20mA, each laser ranging in laser range sensor group 2 passes
The preamplifier for amplifying voltage signal, transmitter and preamplifier are equipped between sensor and master control computing subsystem 3
Output end be connected respectively with the AD conversion unit in master control computing subsystem 3.
The ARM chip circuit carries out analysis and synthesis processing to all sampled datas, to obtain tested spot printing
Thickness of coating, and control signal can be provided to displacement servo system by numeral output driving circuit, while defeated using number
Enter driving circuit and receives each limit switch signal.
The master control computing subsystem 3 preferably further with ethernet interface circuit, RS485 interface circuit, CAN Bus
Interface circuit is connected, and is used for digitized communication, any one digital interface may be selected and realize the measuring device and top level control system
The communication of system, including send control decision information and arrive top level control system, transmission measuring state and data to top level control system,
Receive the work such as the instruction from top level control system.
It is further provided in the heat insulation layer thickness on-line measurement device for the displacement servo to automatically grinding equipment
System drive motor provides control signal and acquires the driver of motor real-time working condition, in which: master control computing subsystem 3 passes through
Numeral input driving circuit receives the instruction of top level control system, obtains the real-time working condition information of motor by driver and sends
Motor control signal, and when limit switch signal triggering 3 output reset signal of master control computing subsystem to driver to
Control motor turns to position of readiness.
The present embodiment is related to the measurement method of above-mentioned apparatus, includes the following steps:
Step 1: as shown in figure 3, carrying out vortex ranging calibration to metallic matrix, specific steps include:
1.1) suitable current vortex sensor is selected according to cylinder size to be measured, measurement accuracy and detection frequency, according to
The measurement range of sensor determines initial distance, carries out caliberating device initialization；
1.2) lift-off in measurement range changes a lift off every 0.1mm, and the measurement to reduce in operation misses
Difference, each lift off measure 5 output voltage signals, take its average value, select multimodal Gaussian function to eddy current signal with mention
Separation establishes test specimen vortex ranging model to be measured from being fitted.
The multimodal Gaussian function are as follows:Wherein: ai、bi、ciFor constant, x is eddy current signal, y
It is calibrated lift off.
Prediction output is acquired according to vortex ranging model, compared with true lift off, obtains prediction error, and further
Judgement exceeds prescribed limit when error, then according to the prediction error update model parameter of vortex ranging model, otherwise stops calculating
And vortex ranging model is updated, complete the foundation of vortex ranging model.
The update refers to: according to the criterion for reducing prediction error, adjusting and obtains undetermined parameter in multimodal Gaussian function.
Step 2: as shown in Fig. 2, being non-contact electric eddy sensor instrument distance model, obtaining current vortex sensor and export whirlpool
The vortex ranging model that stream signal and invocation step 1 obtain calculates metallic matrix vortex central point C to eddy current probe end face
The distance of A.
Step 3: as shown in Figure 1, being exported the distance measured in a manner of voltage three laser range sensors, being
Guarantee that optimal measurement accuracy preferably outputs it the range position that voltage is adjusted to master control computing subsystem 3, passes through three points one
Face mode obtains detection plane π and eddy current probe end face distance.
The three point one side modes as shown in figure 5, specifically: three laser range sensors can be surveyed in measurement process
Obtain light projector point Mi(i=1,2,3) and corresponding three characteristic point ViThe distance between (i=1,2,3) Di(i=1,2,3), institute
With point ViThe z coordinate of (i=1,2,3) isWherein:It is pressed from both sides for laser range sensor throw light and z-axis
The radius at angle, circle E can obtain three characteristic point V according to the geometric properties of equilateral triangle for RiThe x and y coordinates of (i=1,2,3)
ForDue to θ=30 °, characteristic point ViThe coordinate of (i=1,2,3) is
3 coordinates, sought V in known spatiali(i
=1,2,3) plane equation Ax+By+Cz+D=0, enables x=0, y=0, seeks the coordinate P=(0,0, z of outer surface central point Pp)；
Then determine matrix vortex coated layer outer surface central point P to the distance of detection plane π, i.e. laser range sensor group light projector
Plan range OP=where point | zp|。
Step 4: the metallic matrix vortex central point C according to obtained in step 2 of master control computing subsystem 3 to current vortex is visited
The distance of matrix vortex coated layer outer surface central point P obtained in the distance and step 3 of end surface A to detection plane π,
Obtain the PC, Δ H=AC-OP- Δ L, in which: Δ L on coated layer in face eddy current probe center thickness deltat H, i.e. Fig. 2
It is detection plane π at a distance from current vortex sensor probe tip face A.
Above-mentioned specific implementation can by those skilled in the art under the premise of without departing substantially from the principle of the invention and objective with difference
Mode carry out local directed complete set to it, protection scope of the present invention is subject to claims and not by above-mentioned specific implementation institute
Limit, each implementation within its scope is by the constraint of the present invention.
Claims (13)
1. a kind of contactless measurement of metal surface coated layer thickness, which is characterized in that big according to sample dimensions to be measured
It is small accordingly to select non-contact turbulent flow detection probe to be demarcated, to obtain the pass of eddy current signal with corresponding lift off
It is curve and establishes test specimen metallic matrix vortex ranging model to be measured, obtains the vortex letter of current vortex sensor in the detection process
Number, ranging model is vortexed according to test specimen metallic matrix to be measured, metallic matrix vortex central point is calculated to eddy current probe end
The distance in face, and coated layer outer surface central point in vortex is further measured according to laser range sensor group and is passed to laser ranging
Plane where sensor group light projector point detects the distance of plane π, metal base surface coated layer thickness is finally calculated.
2. according to the method described in claim 1, it is characterized in that, it is described that whirlpool is accordingly selected according to test specimen size to be measured
Flow detection probe: when measured surface is plane, centered on the point of face center probe line, tested surface diameter should be greater than popping one's head in
1.5 times or more of head diameter；When the arc-shaped surface and center probe line that measured surface is column cylindrical body are orthogonal with axial line
When, generally requiring cylinder diameter is 3 times or more of probe diameter.
3. according to the method described in claim 1, it is characterized in that, the calibration refers to: every 0.1mm change a lift-off away from
From the acquisition eddy current signal that eddy current sensor exports under different lift offs, i.e. voltage or current analog quantity；Pass through multimodal
Gauss curve fitting function demarcates eddy current signal and lift off, establishes test specimen metallic matrix vortex ranging model to be measured, more
Peak Gaussian curve are as follows:Wherein: ai、bi、ciFor constant, x is eddy current signal, y be calibrated lift-off away from
From.
4. method according to claim 1 or 3, characterized in that the calibration, after being preheated to eddy current sensor
The detection of eddy current signal is carried out, again to reduce influence of the environment temperature to measurement result.
5. according to the method described in claim 1, it is characterized in that, the relation curve refers to: the whirlpool of voltage or current forms
Flow signal functional relation corresponding with practical lift off.
6. according to the method described in claim 1, it is characterized in that, the metallic matrix vortex central point refers to: Metal Substrate
Body/coated layer interface, specifically: when eddy current probe is loaded with sine-wave current excitation coil close to metallic matrix surface of test piece
When, because being influenced by alternating magnetic field around coil, vortex is produced in test specimen inside to be measured, this area surfaces central point,
Its corresponding distance for arriving eddy current probe end face obtains eddy current signal especially by current vortex sensor and substitutes into vortex ranging mould
Metallic matrix vortex central point is calculated after type to eddy current probe end face distance.
7. according to the method described in claim 1, it is characterized in that, the coated layer outer surface central point to laser ranging sense
The distance of plane where device group light projector point, according to the contact point of laser range sensor light projector axis and coating layer surface, i.e. feature
The distance of point passes through three point one side modes at a distance from metallic matrix vortex coated layer outer surface central point to detection plane π
Approximation obtains, wherein detection plane π and eddy current probe end face distance are definite value.
8. according to the method described in claim 7, it is characterized in that, the three point one side modes specifically: in measurement process
Three laser range sensors can measure light projector point Mi(i=1,2,3) and corresponding three characteristic point ViBetween (i=1,2,3)
Distance Di(i=1,2,3), so point ViThe z coordinate of (i=1,2,3) isWherein:For laser ranging
The radius of sensor projects light and z-axis angle, circle E can obtain three characteristic points according to the geometric properties of equilateral triangle for R
ViThe x and y coordinates of (i=1,2,3) areDue to θ=30 °, characteristic point Vi(i=1's, 2,3)
Coordinate is3 coordinates, sought V in known spatiali
The plane equation Ax+By+Cz+D=0 of (i=1,2,3), enables x=0, y=0, seeks P point coordinate P=(0,0, zp)；Then base is determined
Distance of the body vortex coated layer outer surface central point to detection plane π, i.e., plane where laser range sensor group light projector point
Distance OP=| zp|。
9. according to the method described in claim 1, it is characterized in that, the metal base surface coated layer thickness passes through metal
The distance of matrix vortex central point to eddy current probe end face subtracts matrix vortex coated layer outer surface central point to detection
The distance and detection plane π of plane π obtains at a distance from current vortex sensor probe tip face.
10. a kind of device for realizing any of the above-described claim the method characterized by comprising non-contact turbulent flow inspection
Probing head and three laser range sensors being arranged around it, in which: three laser range sensors are in 120 ° of angles pair
Claim to be set to current vortex sensor periphery and detects output metallic matrix vortex coated layer centre of surface point to detection plane π's
Metal surface coated layer thickness is calculated in conjunction with the eddy current signal that current vortex sensor exports in distance.
11. device according to claim 10, characterized in that further comprise respectively with current vortex sensor and Laser Measuring
Master control computing subsystem away from the built-in ARM chip circuit that sensor is connected, in which: current vortex sensor and master control calculate subsystem
It is equipped with the displacement signal linearisation for acquiring sensor between system, after normalized, directly exports the pick-up of 4~20mA
Device is equipped with for amplifying voltage between each laser range sensor and master control computing subsystem in laser range sensor group
The output end of the preamplifier of signal, transmitter and preamplifier respectively with the analog-to-digital conversion list in master control computing subsystem
Member is connected.
12. device according to claim 11, characterized in that the master control computing subsystem further connects with Ethernet
Mouth circuit, RS485 interface circuit, CAN Bus interface circuit are connected, and are used for digitized communication, any one number may be selected and connect
Cause for gossip shows the communication of the measuring device and top level control system, including sends control decision information to top level control system, sends
Measuring state and data receive the instruction works from top level control system to top level control system.
13. device according to claim 11, characterized in that be further provided with for being watched to the displacement of automatically grinding equipment
Dress system driving motor provides control signal and acquires the driver of motor real-time working condition, in which: master control computing subsystem is logical
The instruction that numeral input driving circuit receives top level control system is crossed, the real-time working condition information for obtaining motor by driver is concurrent
Power transmission machine control signal, and when limit switch signal triggering when master control computing subsystem output reset signal to driver to
Control motor turns to position of readiness.
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Cited By (7)
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| CN110260778A (en) * | 2019-07-19 | 2019-09-20 | 华中科技大学无锡研究院 | Chamfering measurement method and device based on electromagnetic principle |
| CN111023960A (en) * | 2019-12-31 | 2020-04-17 | 新余学院 | Non-contact paint film thickness nondestructive testing system and method based on transparent conductive film electrode material |
| CN111486782A (en) * | 2019-01-26 | 2020-08-04 | 保定长空科技有限公司 | Glass steel coating film thickness non-contact monitoring facilities |
| CN113514539A (en) * | 2021-04-12 | 2021-10-19 | 爱德森（厦门）电子有限公司 | Method and device for detecting temperature resistance and relative expansion coefficient of metal surface coating |
| CN114207338A (en) * | 2019-08-09 | 2022-03-18 | 三樱工业株式会社 | Pipe joint and pipe with pipe joint |
| CN114383493A (en) * | 2022-02-28 | 2022-04-22 | 中国工程物理研究院总体工程研究所 | Method for measuring thickness of non-conductive covering layer on non-contact metal surface |
| CN116242239A (en) * | 2022-12-09 | 2023-06-09 | 江汉大学 | Method and device for detecting thickness of nodular cast iron pipe |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111486782A (en) * | 2019-01-26 | 2020-08-04 | 保定长空科技有限公司 | Glass steel coating film thickness non-contact monitoring facilities |
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| CN114207338A (en) * | 2019-08-09 | 2022-03-18 | 三樱工业株式会社 | Pipe joint and pipe with pipe joint |
| CN111023960A (en) * | 2019-12-31 | 2020-04-17 | 新余学院 | Non-contact paint film thickness nondestructive testing system and method based on transparent conductive film electrode material |
| CN111023960B (en) * | 2019-12-31 | 2021-04-27 | 新余学院 | Non-contact paint film thickness nondestructive testing system and method based on transparent conductive film electrode material |
| CN113514539A (en) * | 2021-04-12 | 2021-10-19 | 爱德森（厦门）电子有限公司 | Method and device for detecting temperature resistance and relative expansion coefficient of metal surface coating |
| CN114383493A (en) * | 2022-02-28 | 2022-04-22 | 中国工程物理研究院总体工程研究所 | Method for measuring thickness of non-conductive covering layer on non-contact metal surface |
| CN114383493B (en) * | 2022-02-28 | 2024-01-30 | 中国工程物理研究院总体工程研究所 | Non-contact metal surface non-conductive coating thickness measuring method |
| CN116242239A (en) * | 2022-12-09 | 2023-06-09 | 江汉大学 | Method and device for detecting thickness of nodular cast iron pipe |
| CN116242239B (en) * | 2022-12-09 | 2023-07-28 | 江汉大学 | Method and device for detecting thickness of nodular cast iron pipe |
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