CN113175863A - Iron powder doped putty layer identification method and paint film instrument - Google Patents
Iron powder doped putty layer identification method and paint film instrument Download PDFInfo
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- CN113175863A CN113175863A CN202110426379.2A CN202110426379A CN113175863A CN 113175863 A CN113175863 A CN 113175863A CN 202110426379 A CN202110426379 A CN 202110426379A CN 113175863 A CN113175863 A CN 113175863A
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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
- G01B7/06—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness
- G01B7/10—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness using magnetic means, e.g. by measuring change of reluctance
- G01B7/105—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness using magnetic means, e.g. by measuring change of reluctance for measuring thickness of coating
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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
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
Abstract
The invention discloses a method for identifying a doped iron powder putty layer and a paint film instrument, which relate to the technical field of second-hand vehicle detection, and specifically comprise the following steps: a paint film instrument shell; the probe is arranged at one end of the paint film instrument shell; an eddy current sensor disposed inside the probe; s1, performing instrument delivery test; s2, detecting a vehicle paint film; s3, judging the thickness value to be one; s4, a second thickness value judgment result and S5, and a third thickness value judgment result. The doped iron powder putty layer identification method and the paint film instrument adopt a Hall effect measurement principle, namely a Hall effect sensor, and an eddy current measurement principle, namely a method for measuring and judging twice by an eddy current sensor, and identify whether a covering layer on a ferromagnetic matrix is the doped iron powder putty layer or not, so as to judge whether the part of an automobile is repaired or not, and can automatically identify whether the automobile is a ferromagnetic automobile body or a non-magnetic automobile body or the non-metallic automobile body based on whether the detected thickness value is in a measuring range or not.
Description
Technical Field
The invention relates to the technical field of second-hand vehicle detection, in particular to a method for identifying a doped iron powder putty layer and a paint film instrument.
Background
The second-hand vehicle trade, there are many trade companies, can refurbish the accident car and take out and sell again, thus improve oneself income, this kind of accident car is unseen from the outward appearance, to the position that the automobile body collided, will polish the old lacquer clean earlier, pick up suitable putty and carry out the blade coating, then spout new lacquer, so need detect through the paint film appearance, the inspector judges whether each position of vehicle has taken place to restore through the thickness that the paint film appearance detected the automobile paint surface, judge whether the vehicle has carried out the renovation and handle, because the overburden (putty layer + paint layer) thickness through the vehicle after repairing compares thickly with the paint film thickness when dispatching from the factory, thereby can detect the thickness of automobile body paint film and whether refurbished and sell through the paint film appearance.
Iron powder is doped in putty by some existing bad merchants, so that a putty layer has certain magnetism, the thickness of a measurement result of a paint film instrument is reduced, the difference from the original factory car paint thickness is not obvious, and whether a car is a renovated car or not cannot be accurately detected.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a method for identifying a putty layer doped with iron powder and a paint film instrument, and solves the problems that some existing bad merchants are provided in the background art and can dope iron powder in putty, so that the putty layer has certain magnetism, the thickness of a measurement result of the paint film instrument is reduced, the difference from the original factory paint thickness is not obvious, and whether a vehicle is a renovated vehicle or not can not be accurately detected.
In order to achieve the purpose, the invention is realized by the following technical scheme: a paint film apparatus comprising:
a paint film instrument shell;
the probe is arranged at one end of the paint film instrument shell;
the eddy current sensor is arranged in the probe, and a Hall effect sensor is also arranged in the probe;
the high-frequency oscillation circuit is connected with the eddy current sensor and is also connected with the MCU main controller;
the ADC conversion chip is connected with the Hall effect sensor and is also connected with the MCU main controller;
the liquid crystal is connected with the MCU main controller;
and the trigger switch is connected with the probe and is also connected with the MCU main controller.
A method for identifying a doped iron powder putty layer by a paint film instrument comprises the following operation steps:
s1, instrument delivery test:
measuring Hall induction voltage V and eddy current oscillation frequency F corresponding to a series of covering layers H with different thicknesses by using the paint film instrument, respectively obtaining a quantitative relation curve of the Hall induction voltage V and the covering layer thickness H and a quantitative relation curve of the eddy current oscillation frequency F and the covering layer thickness H, and storing the quantitative relation curves on the instrument;
s2, vehicle paint film detection:
pressing a probe on the surface of a paint film of a covering layer, namely a vehicle, synchronously sliding the probe and a trigger switch to realize triggering, detecting the closing of the trigger switch by an MCU (microprogrammed control unit), starting measurement, measuring by a Hall effect sensor and then by an eddy current sensor by an instrument, and simultaneously obtaining two thickness values, wherein the thickness values are a Hall principle measurement thickness value 1 and an eddy current principle measurement thickness value 2 respectively;
s3, first thickness value judgment result:
judging whether the thickness value 1 is in the range, judging that the matrix is a ferromagnetic matrix in the range, judging whether the thickness value 2 is in the range again, judging whether the thickness value 2 minus the thickness value 1 is greater than a threshold value in the range, if so, judging that the iron plate is covered by a putty layer doped with iron powder, and if not, directly judging that the iron plate is covered by the putty layer doped with iron powder;
s4, thickness value judgment result II:
if the thickness value 1 is not in the range of measurement and the thickness value 2 is in the range of measurement, the matrix is a non-ferromagnetic metal matrix;
s5, thickness value judgment result III:
the thickness value 1 is not in the range, the thickness value 2 is not changed in the range, and the covering layer thickness exceeds the range or the substrate is a non-metal substrate.
Optionally, in step S1, taking the curve of the quantitative relationship between the hall induced voltage V and the cover layer thickness H as an example, the operation is performed by covering a thin film sheet on an iron substrate, and the standard thickness of the thin film is calibrated by a sanfeng ten-thousandth micrometerDivide chi resolution ratio 1um, error 2um, the film of 17 kinds of different thickness is selected to the sheet, measures 21.5um with ten thousand chi, 52um, 100um, 200um, 300um, 400um, 500um, 600um, 700um, 800um, 900um, 1002um, 1250um, 1502um, 1752um, 2000um with ten thousand chi, measures earlier and does not have the corresponding hall induced voltage V of overburden iron base0umThen 17 sheets of 21.5um and 52um … … 2000um were placed on the iron base to measure the corresponding V21.5um，V52um……V2000umAnd finally measuring a V without iron base∞，V∞I.e., V at infinity from the iron basis, the measurements were normalized:
ΔV0＝V0um-V0um＝0
………
normalized Δ V0-ΔV∞Data for changes to 0-1, 0, 0.030304,0.073379, 0.138184, 0.199209, 0.250782, 0.34416, 0.421945, 0.486703, 0.541282, 0.588354, 0.629393, 0.666356, 0.69745, 0.758234, 0.80414, 0.866268, 1 are non-linear with coating thickness using a piecewise 2 degree polynomial fit;
segmenting according to the normalized voltage value: 0-0.138184, 0.138184-0.486703, 0.486703-0.69745 and 0.69745-1, and if higher-precision fitting is needed, the method can be divided into more sections;
the second order polynomial is as follows:
Hn＝an.ΔV2+bn.ΔV+cn
fitting by using a least square method to obtain a, b and c coefficients of each section of quadratic polynomial;
the above polynomial is stored in a memory of an instrument singlechip, and the corresponding polynomial is called according to the normalized Hall induction voltage during measurement, so that the coating thickness can be calculated.
Optionally, the method for obtaining the quantitative relation curve of the eddy current oscillation frequency F and the cover layer thickness H is the same as the hall principle curve, except that the hall induced voltage is changed into the oscillation frequency F.
Optionally, in step S3, if there is no iron powder doped putty layer, the thickness value 1 and the "ferromagnetic matrix" character are displayed on the liquid crystal, and the iron powder doped putty layer only displays the character "iron powder doped putty layer exists" on the liquid crystal.
Optionally, in step S4, the liquid crystal displays the thickness value 2 and the "non-ferromagnetic metal matrix" character.
Optionally, in step S5, the liquid crystal displays only the text "over-range, non-metallic matrix".
Optionally, when the ferromagnetic matrix is sensed and the putty layer doped with iron powder is absent, the thickness value measured according to the hall effect principle is used as a reference, and because the conductivity of the ferromagnetic matrix of different materials is different, the thickness value measured by eddy current has a larger error.
Optionally, the measuring range of the thickness value 2 is larger than the measuring range + threshold of the thickness value 1.
Optionally, the operation process of the eddy current sensor is as follows: the high-frequency oscillation circuit generates high-frequency alternating current which is transmitted to the eddy current coil, a high-frequency alternating electromagnetic field is generated in the coil, when the probe is contacted with the covering layer, a conductor below the probe generates an eddy current and generates a feedback effect on the coil in the probe, the oscillation frequency changes, the MCU main controller measures the oscillation frequency through the capture module, and a corresponding curve of the thickness and the oscillation frequency is searched, so that the thickness of the covering layer can be calculated;
the working process of the Hall effect sensor is as follows: the magnetic field of the magnet is led into the Hall device through the magnetic conductive iron column, the Hall device generates induction voltage, when the probe is in contact with the covering layer, the magnet of the probe and the magnetic metal substrate form a closed magnetic circuit, the magnetic resistance of the magnetic circuit changes due to the existence of the non-magnetic covering layer, so that the magnetic flux changes, the thicker the covering layer is, the smaller the magnetic flux is, the smaller the Hall induction voltage is, the induction voltage is converted into a digital signal through an ADC conversion chip, and the MCU main controller can calculate the thickness of the covering layer by measuring the voltage change and searching a corresponding curve of the thickness and the voltage.
The invention provides a method for identifying a putty layer doped with iron powder and a paint film instrument, which have the following beneficial effects:
the paint film instrument adopts a Hall effect measuring principle, namely a Hall effect sensor, and an eddy current measuring principle, namely a method for measuring and judging twice by an eddy current sensor, and identifies whether a covering layer on a ferromagnetic substrate is a putty layer doped with iron powder, so that whether the part of an automobile is repaired is judged, and the automobile can be automatically identified to be a ferromagnetic automobile body or a non-magnetic automobile body and a non-metal automobile body based on whether the detected thickness value is in a measuring range.
Drawings
FIG. 1 is a schematic overall flow diagram of the present invention;
FIG. 2 is a schematic view of the internal flow of the paint film instrument housing of the present invention.
In the figure: 1. a paint film instrument shell; 2. a probe; 3. an eddy current sensor; 4. a Hall effect sensor; 5. a high-frequency oscillation circuit; 6. the MCU main controller; 7. an ADC conversion chip; 8. a liquid crystal; 9. the switch is triggered.
Detailed Description
Referring to fig. 1 to 2, the present invention provides a technical solution: a paint film apparatus comprising:
a paint film instrument shell 1;
the probe 2 is arranged at one end of the paint film instrument shell 1;
the eddy current sensor 3 is arranged inside the probe 2, and a Hall effect sensor 4 is also arranged inside the probe 2;
the high-frequency oscillation circuit 5 is connected with the eddy current sensor 3, and the high-frequency oscillation circuit 5 is also connected with the MCU main controller 6;
the ADC conversion chip 7 is connected with the Hall effect sensor 4, and the ADC conversion chip 7 is also connected with the MCU main controller 6;
the liquid crystal 8 is connected with the MCU main controller 6;
the trigger switch 9 is connected with the probe 2, and the trigger switch 9 is also connected with the MCU main controller 6;
a method for identifying a doped iron powder putty layer by a paint film instrument comprises the following operation steps:
s1, instrument delivery test:
measuring Hall induction voltage V and eddy current oscillation frequency F corresponding to a series of covering layers H with different thicknesses by using the paint film instrument, respectively obtaining a quantitative relation curve of the Hall induction voltage V and the covering layer thickness H and a quantitative relation curve of the eddy current oscillation frequency F and the covering layer thickness H, and storing the quantitative relation curves on the instrument;
s2, vehicle paint film detection:
pressing a probe 2 on the surface of a paint film of a covering layer, namely a vehicle, synchronously sliding the probe 2 and a trigger switch 9 to realize triggering, detecting the closing of the trigger switch by an MCU (microprogrammed control unit) main controller, starting measurement, measuring by a Hall effect sensor and then by an eddy current sensor by an instrument, and simultaneously obtaining two thickness values, wherein the thickness values are a Hall principle measurement thickness value 1 and an eddy current principle measurement thickness value 2 respectively;
s3, first thickness value judgment result:
judging whether the thickness value 1 is in the range, judging that the matrix is a ferromagnetic matrix in the range, judging whether the thickness value 2 is in the range again, judging whether the thickness value 2 minus the thickness value 1 is greater than a threshold value in the range, if so, judging that the iron plate is covered by a putty layer doped with iron powder, and if not, directly judging that the iron plate is covered by the putty layer doped with iron powder;
s4, thickness value judgment result II:
if the thickness value 1 is not in the range of measurement and the thickness value 2 is in the range of measurement, the matrix is a non-ferromagnetic metal matrix;
s5, thickness value judgment result III:
the thickness value 1 is not in the range of measurement, the thickness value 2 is not changed in the range of measurement, which indicates that the thickness of the covering layer exceeds the range or the substrate is a non-metal substrate;
in step S1, taking the quantitative relation curve of hall induced voltage V and cover layer thickness H as an example, the operation is performed by using a method of covering a thin film sheet on an iron substrate, the standard thickness of the thin film is calibrated by a sanfeng ten thousandth micrometer, the resolution of the ten thousandth micrometer is 1um, the error is ± 2um, 17 kinds of thin films with different thicknesses are selected for the sheet, the film thickness is 21.5um, 52um, 100um, 200um, 300um, 400um, 500um, 600um, 700um, 800um, 900um, 1002um, 1250um, 1502um, 1752um, 2000um respectively, the non-iron-based corresponding hall induced voltage V is measured first0umThen 17 sheets of 21.5um and 52um … … 2000um were placed on the iron base to measure the corresponding V21.5um，V52um……V2000umAnd finally measuring a V without iron base∞，V∞I.e., V at infinity from the iron basis, the measurements were normalized:
ΔV0＝V0um-V0um＝0
………
normalized Δ V0-ΔV∞Data for changes to 0-1, 0, 0.030304,0.073379, 0.138184, 0.199209, 0.250782, 0.34416, 0.421945, 0.486703, 0.541282, 0.588354, 0.629393, 0.666356, 0.69745, 0.758234, 0.80414, 0.866268, 1 are non-linear with coating thickness using a piecewise 2 degree polynomial fit;
segmenting according to the normalized voltage value: 0-0.138184, 0.138184-0.486703, 0.486703-0.69745 and 0.69745-1, and if higher-precision fitting is needed, the method can be divided into more sections;
the second order polynomial is as follows:
Hn＝an.ΔV2+bn.ΔV+cn
fitting by using a least square method to obtain a, b and c coefficients of each section of quadratic polynomial;
storing the above polynomial in a memory of an instrument singlechip, and calling the corresponding polynomial according to the normalized Hall sensing voltage during measurement to calculate the coating thickness;
the method for obtaining the quantitative relation curve of the eddy current oscillation frequency F and the thickness H of the covering layer is the same as that of a Hall principle curve, and only the Hall induction voltage is changed into the oscillation frequency F;
in step S3, if there is no iron powder doped putty layer, the thickness value 1 and the "ferromagnetic matrix" characters are displayed on the liquid crystal 8, and the iron powder doped putty layer only displays the characters "there is an iron powder doped putty layer" on the liquid crystal 8;
in step S4, the liquid crystal 8 displays the thickness value 2 and the "non-ferromagnetic metal matrix" character;
in step S5, the liquid crystal 8 displays only the text "overrange, non-metallic matrix";
when a ferromagnetic matrix is sensed and a putty layer doped with iron powder is not available, the thickness value is based on the thickness value measured by the Hall effect principle, because the conductivity of the ferromagnetic matrix of different materials is different, the thickness value measured by the eddy current has larger error,
the measuring range of the thickness value 2 is larger than the measuring range + threshold value of the thickness value 1;
the operation process of the eddy current sensor 3 is as follows: the high-frequency oscillation circuit 5 generates high-frequency alternating current which is transmitted to the eddy current coil, a high-frequency alternating electromagnetic field is generated in the coil, when the probe 2 is contacted with the covering layer, a conductor below the probe 2 generates an eddy current and generates a feedback effect on the coil in the probe 2, the oscillation frequency changes, the MCU main controller 6 measures the oscillation frequency through the capture module, and a corresponding curve of the thickness and the oscillation frequency is searched, so that the thickness of the covering layer can be calculated;
the working process of the Hall effect sensor 4 is as follows: the magnetic field of the magnet is led into the Hall device through the magnetic conductive iron column, the Hall device produces induced voltage, when the probe 2 contacts with the covering layer, the magnet of the probe 2 and the magnetic metal substrate form a closed magnetic circuit, the magnetic resistance of the magnetic circuit changes due to the existence of the non-magnetic covering layer, so that the magnetic flux changes, the thicker the covering layer is, the smaller the magnetic flux is, the smaller the Hall induced voltage is, the induced voltage is converted into a digital signal through an ADC conversion chip 7, and the MCU main controller 6 can calculate the thickness of the covering layer by measuring the voltage change and searching a corresponding curve of the thickness and the voltage;
the paint film instrument adopts a method of twice measurement and judgment of a Hall effect measurement principle, namely a Hall effect sensor 4, and an eddy current measurement principle, namely an eddy current sensor 3, to identify whether a covering layer on a ferromagnetic substrate is a putty layer doped with iron powder, so as to judge whether the part of an automobile is repaired, and can automatically identify whether the automobile is a ferromagnetic automobile body or a non-magnetic automobile body and a non-metallic automobile body based on whether the detected thickness value is within a range.
In conclusion, the method for identifying the iron powder doped putty layer and the paint film instrument comprise the following operation steps when in use:
s1, instrument delivery test: measuring Hall induction voltage V and eddy current oscillation frequency F corresponding to a series of covering layers H with different thicknesses by using the paint film instrument, respectively obtaining a quantitative relation curve of the Hall induction voltage V and the covering layer thickness H and a quantitative relation curve of the eddy current oscillation frequency F and the covering layer thickness H, and storing the quantitative relation curves on the instrument;
s2, vehicle paint film detection: pressing the probe 2 on the surface of a paint film of a covering layer, namely a vehicle, enabling the probe 2 to touch the trigger switch 9, enabling the MCU main controller 6 to detect that the trigger switch 9 is closed, starting measurement, firstly measuring by using the Hall effect sensor 4 and then measuring by using the eddy current sensor 3, and simultaneously obtaining two thickness values, wherein the thickness values are a Hall principle measurement thickness value 1 and an eddy current principle measurement thickness value 2 respectively;
s3, first thickness value judgment result: judging whether the thickness value 1 is in the range, judging that the matrix is a ferromagnetic matrix in the range, judging whether the thickness value 2 is in the range again, judging whether the thickness value 2 minus the thickness value 1 is greater than a threshold value in the range, if so, judging that the iron plate is covered by a putty layer doped with iron powder, and if not, directly judging that the iron plate is covered by the putty layer doped with iron powder;
s4, thickness value judgment result II: if the thickness value 1 is not in the range of measurement and the thickness value 2 is in the range of measurement, the matrix is a non-ferromagnetic metal matrix;
s5, thickness value judgment result III: the thickness value 1 is not in the range of measurement, the thickness value 2 is not changed in the range of measurement, which indicates that the thickness of the covering layer exceeds the range or the substrate is a non-metal substrate;
the paint film instrument adopts a method of twice measurement and judgment of a Hall effect measurement principle, namely a Hall effect sensor 4, and an eddy current measurement principle, namely an eddy current sensor 3, to identify whether a covering layer on a ferromagnetic substrate is a putty layer doped with iron powder, so as to judge whether the part of an automobile is repaired, and can automatically identify whether the automobile is a ferromagnetic automobile body or a non-magnetic automobile body and a non-metallic automobile body based on whether the detected thickness value is within a range.
Claims (9)
1. A paint film apparatus, comprising:
a paint film instrument shell;
the probe is arranged at one end of the paint film instrument shell;
the eddy current sensor is arranged in the probe, and a Hall effect sensor is also arranged in the probe;
the high-frequency oscillation circuit is connected with the eddy current sensor and is also connected with the MCU main controller;
the ADC conversion chip is connected with the Hall effect sensor and is also connected with the MCU main controller;
the liquid crystal is connected with the MCU main controller;
and the trigger switch is connected with the probe and is also connected with the MCU main controller.
2. The paint film apparatus as claimed in claim 1, wherein the method for identifying the iron powder doped putty layer by the paint film apparatus comprises the following steps:
s1, instrument delivery test:
measuring Hall induction voltage V and eddy current oscillation frequency F corresponding to a series of covering layers H with different thicknesses by using the paint film instrument, respectively obtaining a quantitative relation curve of the Hall induction voltage V and the covering layer thickness H and a quantitative relation curve of the eddy current oscillation frequency F and the covering layer thickness H, and storing the quantitative relation curves on the instrument;
s2, vehicle paint film detection:
pressing a probe on the surface of a paint film of a covering layer, namely a vehicle, synchronously sliding the probe and a trigger switch to realize triggering, detecting the closing of the trigger switch by an MCU (microprogrammed control unit), starting measurement, measuring by a Hall effect sensor and then by an eddy current sensor by an instrument, and simultaneously obtaining two thickness values, wherein the thickness values are a Hall principle measurement thickness value 1 and an eddy current principle measurement thickness value 2 respectively;
s3, first thickness value judgment result:
judging whether the thickness value 1 is in the range, judging that the matrix is a ferromagnetic matrix in the range, judging whether the thickness value 2 is in the range again, judging whether the thickness value 2 minus the thickness value 1 is greater than a threshold value in the range, if so, judging that the iron plate is covered by a putty layer doped with iron powder, and if not, directly judging that the iron plate is covered by the putty layer doped with iron powder;
s4, thickness value judgment result II:
if the thickness value 1 is not in the range of measurement and the thickness value 2 is in the range of measurement, the matrix is a non-ferromagnetic metal matrix;
s5, thickness value judgment result III:
the thickness value 1 is not in the range, the thickness value 2 is not changed in the range, and the covering layer thickness exceeds the range or the substrate is a non-metal substrate.
3. The method for identifying the doped iron powder putty layer and the paint film instrument as claimed in claim 2, wherein the method for obtaining the quantitative relation curve of the eddy current oscillation frequency F and the cover layer thickness H is the same as the Hall principle curve, except that the Hall induction voltage is changed into the oscillation frequency F.
4. The method for identifying the iron powder doped putty layer and the paint film instrument as claimed in claim 2, wherein in step S3, if there is no iron powder doped putty layer, the thickness value 1 and the characters "ferromagnetic matrix" are displayed on the liquid crystal, and if there is an iron powder doped putty layer, only the characters "iron powder doped putty layer" are displayed on the liquid crystal.
5. The method and the apparatus for identifying the doped iron powder putty layer as claimed in claim 2, wherein in step S4, the liquid crystal display shows the thickness value 2 and the characters of "non-ferromagnetic metal matrix".
6. The method and apparatus for identifying doped iron powder putty layer as claimed in claim 2 wherein in step S5, the liquid crystal displays only the text "overrange, non-metallic matrix".
7. The method for identifying doped iron powder putty layer and the paint film apparatus as claimed in any one of claims 2-6, wherein when the ferromagnetic matrix is sensed and there is no doped iron powder putty layer, the thickness value is based on the thickness value measured by Hall effect principle, because the conductivity of the ferromagnetic matrix is different for different materials, the error of the thickness value measured by eddy current is larger.
8. The method and the paint film apparatus for identifying the doped iron powder putty layer as claimed in any one of claims 2 to 7, wherein the range of the thickness value 2 is greater than the range of the thickness value 1 + the threshold value.
9. The method for identifying the doped iron powder putty layer and the paint coating instrument as claimed in any one of claims 2 to 8, wherein the eddy current sensor works as follows: the high-frequency oscillation circuit generates high-frequency alternating current which is transmitted to the eddy current coil, a high-frequency alternating electromagnetic field is generated in the coil, when the probe is contacted with the covering layer, a conductor below the probe generates an eddy current and generates a feedback effect on the coil in the probe, the oscillation frequency changes, the MCU main controller measures the oscillation frequency through the capture module, and a corresponding curve of the thickness and the oscillation frequency is searched, so that the thickness of the covering layer can be calculated;
the working process of the Hall effect sensor 4 is as follows: the magnetic field of the magnet is led into the Hall device through the magnetic conductive iron column, the Hall device generates induction voltage, when the probe is in contact with the covering layer, the magnet of the probe and the magnetic metal substrate form a closed magnetic circuit, the magnetic resistance of the magnetic circuit changes due to the existence of the non-magnetic covering layer, so that the magnetic flux changes, the thicker the covering layer is, the smaller the magnetic flux is, the smaller the Hall induction voltage is, the induction voltage is converted into a digital signal through an ADC conversion chip, and the MCU main controller can calculate the thickness of the covering layer by measuring the voltage change and searching a corresponding curve of the thickness and the voltage.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114062440A (en) * | 2021-11-17 | 2022-02-18 | 广州市果欧电子科技有限公司 | Detection method and device for metal putty, electronic equipment and storage medium |
| CN114088806A (en) * | 2021-11-17 | 2022-02-25 | 广州市果欧电子科技有限公司 | Identification method and identification device for metal putty, electronic equipment and storage medium |
| CN114413740A (en) * | 2022-02-21 | 2022-04-29 | 深圳市聚茂源科技有限公司 | Coating thickness gauge and application method thereof |
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| CN114062440A (en) * | 2021-11-17 | 2022-02-18 | 广州市果欧电子科技有限公司 | Detection method and device for metal putty, electronic equipment and storage medium |
| CN114088806A (en) * | 2021-11-17 | 2022-02-25 | 广州市果欧电子科技有限公司 | Identification method and identification device for metal putty, electronic equipment and storage medium |
| CN114413740A (en) * | 2022-02-21 | 2022-04-29 | 深圳市聚茂源科技有限公司 | Coating thickness gauge and application method thereof |
| CN114413740B (en) * | 2022-02-21 | 2024-02-27 | 深圳市聚茂源科技有限公司 | Coating thickness gauge and application method thereof |
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