CN114383963A - Indentation reading method of micro Vickers hardness tester - Google Patents
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- 238000007542 hardness measurement Methods 0.000 claims abstract description 42
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- 238000005259 measurement Methods 0.000 claims description 7
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- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/40—Investigating hardness or rebound hardness
- G01N3/42—Investigating hardness or rebound hardness by performing impressions under a steady load by indentors, e.g. sphere, pyramid
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The invention discloses an indentation reading method of a micro Vickers hardness tester, which adopts the following testing equipment comprising a micro Vickers hardness tester, wherein the micro Vickers hardness tester adopts a hardness testing system when reading the indentation, the hardness testing system comprises a hardness testing module, an indentation reading module, a loading precision control module and a hardness calculation output module, the hardness testing module is used for testing the Vickers hardness value of a sample, the indentation reading module is used for controlling the indentation reading precision in the testing process, the loading precision control module is used for controlling the loading precision of testing force, the hardness calculation output module is used for calculating the Vickers hardness value of the output sample, the hardness testing module is electrically connected with the indentation reading module and the loading precision control module, the indentation reading module is electrically connected with the uniform hardness calculation output module of the loading precision control module, the invention has the characteristics of high hardness testing efficiency and high indentation reading precision.
Description
Technical Field
The invention relates to the technical field of hardness measurement, in particular to an indentation reading method of a micro Vickers hardness tester.
Background
The Vickers hardness tester is a novel Vickers and Knoop hardness tester which adopts a precision mechanical technology, a photoelectric technology, a graphic image processing technology and material hardness analysis software. The Vickers hardness tester has novel appearance, adopts microcomputer control, can adjust the intensity of a measuring light source through software key input, presets testing force holding time, switches Vickers and Knoop testing methods, files and stores and the like.
However, the existing vickers hardness tester has low testing efficiency and higher requirement on testing technology, the traditional indentation reading method has higher requirement on the surface smoothness of a sample, a special sample is usually required to be manufactured, the operation is troublesome and time-consuming, and the method is usually only carried out in a laboratory. Meanwhile, in the aspects of indentation reading precision and test force loading precision, the traditional Vickers hardness tester is simple in function, the indentation reading method is common, and the defects of inaccurate reading, low manual adjustment speed and low algorithm response speed often occur. And because the loading precision of the test force is reflected by the precision of the sensor, when the measuring range of the sensor is selected, the quantity value of a test object is generally controlled within 10% -90% of the rated measuring range of the sensor to obtain higher measuring precision, if a sensor with a larger measuring range is used for measuring physical quantity which is less than 1% of the rated measuring range, a larger measuring error is generated, and the measurement of the Vickers hardness value is not accurate. Therefore, it is necessary to design an indentation reading method of a micro vickers hardness tester having high hardness test efficiency and high indentation reading accuracy.
Disclosure of Invention
The present invention is directed to provide an indentation reading method for a micro vickers hardness tester to solve the above problems in the background art.
In order to solve the technical problems, the invention provides the following technical scheme: an indentation reading method of a micro Vickers hardness tester adopts the following testing equipment comprising the micro Vickers hardness tester, the micro Vickers hardness tester adopts a hardness testing system when reading the indentation, the hardness testing system comprises a hardness testing module, an indentation reading module, a loading precision control module and a hardness calculation output module, the hardness testing module is used for testing the Vickers hardness value of a sample, the indentation reading module is used for controlling the indentation reading accuracy in the testing process, the loading precision control module is used for controlling the loading precision of the test force, the hardness calculation output module is used for calculating the Vickers hardness value of the output sample, the hardness testing module is electrically connected with the indentation reading module and the loading precision control module, and the indentation reading module is electrically connected with the uniform hardness calculation output module of the loading precision control module.
According to the technical scheme, the hardness testing module comprises a color panoramic camera shooting module, a capturing module and a learning control module, the color panoramic camera shooting module is used for shooting image information of a sample, the capturing module is used for automatically correcting the position of the starting point of a testing sequence, and the learning control module is used for learning and controlling hardness testing according to a testing program.
According to the technical scheme, the indentation reading module comprises an electric zooming unit, a reflected light collecting module, a straightness collecting module and an indentation judging module, the electric zooming unit is electrically connected with the color panoramic camera module, the electric zooming unit is used for controlling the zooming multiple of the color panoramic camera module, the reflected light collecting module is used for collecting the reflected light of the indentation on the surface of the sample, the straightness collecting module is used for collecting the straightness of the indentation on the surface of the sample, the indentation judging module is electrically connected with the reflected light collecting module and the straightness collecting module, and the indentation judging module is used for identifying and judging the indentation on the surface of the sample.
According to the technical scheme, the loading precision control module comprises a multi-stage range sensor module and a test force loading display module, wherein the multi-stage range sensor module is used for measuring test force in a grading manner, and the test force loading display module is used for analyzing and displaying a loading test force value;
the multi-level range sensor module comprises a grading reading submodule, a grading force control unit and a central control protection unit, wherein the grading reading submodule is used for reading the value of a sensor in a grading mode, the grading force control unit is used for controlling the measurement limit value of the sensor in a grading mode, and the central control protection unit is used for limiting the measurement value of the protection sensor.
According to the technical scheme, the operation process and the indentation reading method of the hardness testing system mainly comprise the following steps:
step S1: placing the sample on a sample clamp of a micro Vickers hardness tester, and starting a hardness testing system;
step S2: the loading precision control module is started to control the starting of the testing pressure head and apply a testing force to the sample, and the multi-level range sensor module monitors the loading testing force and calculates and displays a loading force value by the testing force loading display module;
step S3: the testing force is removed, the hardness testing module controls the color panoramic camera module to move to the height of the sample clamp, and the sample hardness is tested;
step S4: in the testing process, the indentation reading module is started, and the indentation reading precision is analyzed and controlled by an indentation reading method and is output to the hardness testing module;
step S5: the hardness testing module tests and captures detection data, and the hardness calculation output module outputs a Vickers hardness calculation result of the sample to finish the Vickers hardness test.
According to the above technical solution, the step S2 further includes the following steps:
step S21: after a test force is applied to the sample, the multi-level range sensor module controls the maximum range sensor to monitor the loading test force;
step S22: the grading reading submodule reads a maximum measuring range sensor to monitor a loading test force value, when the currently monitored loading test force value is less than 10% of the maximum measuring range, the central control protection unit cancels the protection of the secondary measuring range sensor, and the grading force control unit controls the next-level measuring range sensor which is compared with the previous measuring range to monitor the loading test force;
step S23: and step S22 is repeated until the loading test force value monitored currently is more than or equal to 10% of the measuring range of the current sensor, and the grading reading submodule reads the loading test force value monitored currently by the sensor.
According to the above technical solution, the step S23 further includes the following steps:
step S231: when the loading test force value is more than or equal to 10% of the current sensor measuring range, the grading reading sub-module further reads the specific loading test force value in a grading way from a high digit to a low digit, and the specific loading test force value is sequentially matched and presented on the corresponding position of the test force loading display module;
step S232: when the grading reading sub-module reads the lowest bit of the current loading test force value, which does not reach the lowest bit of the test force loading precision, the precision of the loading test force value displayed by the test force loading display module does not reach the set precision, and the grading force control unit controls the lowest bit of the current sensor to be rounded and controls the corresponding loaded force value to be loaded;
step S233: starting a small-range sensor in an interval where the lowest position of the current sensor measuring range is located, measuring a residual loading test force value by the small-range sensor under the corresponding bearing force to obtain a more accurate value, and adding the more accurate value and the corresponding bearing force value to obtain a loading test force value with higher accuracy;
step S234: and sequentially matching and presenting the numerical values with higher precision on the corresponding order of the test force loading display module, so that the finally measured lowest order of the loading test force numerical value reaches the lowest order of the test force loading precision.
According to the above technical solution, the step S3 further includes the following steps:
step S31: the color panoramic camera module automatically shoots an image of a sample;
step S32: dragging the test sequence point to a preset position by a capture module, and automatically correcting the position of the starting point of the test sequence;
step S33: the learning control module executes according to the applicable hardness test standard and sets a control of learning to create a plurality of samples and a plurality of sequences, an automatic minimum interval, and an optimal stop time.
According to the above technical solution, the indentation reading method in step S4 further includes the following steps:
step S41: in the test process, the electric zoom unit drives the color panoramic camera module to zoom electrically, so that the picture shot by the color panoramic camera module can be adjusted at 1-1000 times, and the real-time picture is aligned with the focus by observing a computer; the difficulty in accurate control during manual operation is avoided, and the definition of an indentation shooting picture is improved;
step S42: the reflected light collection module receives reflected light of the surface of the sample captured during shooting and captures the reflection angle of the collected light;
step S43: counting the light reflection angle data of each position, determining an area with a small dispersion degree of the light reflection angle as an indentation area, and finally identifying a total indentation area according to a current indentation reading method;
step S44: the straightness acquisition module acquires the contour of the indentation area, finds the part with higher definition of the four-side contour, fits the contour line of the indentation area, respectively prolongs the contour line of the indentation area, and determines each intersection point of the extension lines as an indentation vertex;
step S45: and the indentation judgment module identifies and judges the corrected indentation area of the current sample.
Compared with the prior art, the invention has the following beneficial effects: according to the invention, the hardness testing module, the indentation reading module, the loading precision control module, the hardness calculation output module and the indentation reading method are arranged, so that the requirement on sample preparation when the hardness testing is carried out on the surface of a non-optimal sample can be effectively reduced, the requirement on the smoothness of the surface of the sample is greatly reduced, the indentation identification is realized under the condition of poor surface quality of the sample, the problem of testing force loading precision is solved by overlapping and using small-range multi-sensors, the indentation reading precision is solved by electrically multiplying 1000 times, and the calculation precision of the Vickers hardness of the sample is finally improved.
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The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic diagram of the system module composition of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the present invention provides a technical solution: an indentation reading method of a micro Vickers hardness tester adopts the following test equipment comprising a micro Vickers hardness tester, wherein the micro Vickers hardness tester adopts a hardness test system when reading an indentation, the hardness test system comprises a hardness test module, an indentation reading module, a loading precision control module and a hardness calculation output module, the hardness test module is used for testing the Vickers hardness value of a sample, the indentation reading module is used for controlling the indentation reading precision in the test process, the loading precision control module is used for controlling the loading precision of test force, the hardness calculation output module is used for calculating the Vickers hardness value of the output sample, the hardness test module is electrically connected with the indentation reading module and the loading precision control module, and the indentation reading module is electrically connected with the uniform hardness calculation output module of the loading precision control module; the hardness testing module, the indentation reading module, the loading precision control module, the hardness calculation output module and the indentation reading method can effectively reduce the requirement on sample preparation when the hardness testing is carried out on the surface of a non-optimal sample, greatly reduce the requirement on the smoothness of the surface of the sample, realize the indentation identification under the condition of poor surface quality of the sample, solve the problem of testing force loading precision by overlapping the small-range multi-sensor, solve the indentation reading precision by electrically zooming 1000 times, and finally improve the calculation precision of the Vickers hardness of the sample.
The hardness testing module comprises a color panoramic camera module, a capturing module and a learning control module, wherein the color panoramic camera module is used for shooting image information of a sample, the capturing module is used for automatically correcting the position of the initial point of a testing sequence, and the learning control module is used for learning and controlling hardness testing according to a testing program; the learning control module automatically generates test points at standard specified minimum intervals, so that the hardness test result is more accurate.
The indentation reading module comprises an electric zoom unit, a reflected light collecting module, a straightness collecting module and an indentation judging module, the electric zoom unit is electrically connected with the color panoramic camera module, the electric zoom unit is used for controlling the zoom multiple of the color panoramic camera module, the reflected light collecting module is used for collecting the reflected light of the indentation on the surface of the sample, the straightness collecting module is used for collecting the straightness of the indentation on the surface of the sample, the indentation judging module is electrically connected with the reflected light collecting module and the straightness collecting module, and the indentation judging module is used for identifying and judging the indentation on the surface of the sample.
The loading precision control module comprises a multi-stage range sensor module and a test force loading display module, wherein the multi-stage range sensor module is used for measuring test force in a grading manner, and the test force loading display module is used for analyzing and displaying a loading test force value;
the multi-level range sensor module comprises a grading reading submodule, a grading force control unit and a central control protection unit, wherein the grading reading submodule is used for reading the value of a sensor in a grading way, the grading force control unit is used for controlling the measurement limit value of the sensor in a grading way, and the central control protection unit is used for limiting the measurement value of the protection sensor.
The operation process of the hardness testing system and the indentation reading method mainly comprise the following steps:
step S1: placing the sample on a sample clamp of a micro Vickers hardness tester, and starting a hardness testing system;
step S2: the loading precision control module is started to control the starting of the testing pressure head and apply a testing force to the sample, and the multi-level range sensor module monitors the loading testing force and calculates and displays a loading force value by the testing force loading display module;
step S3: the testing force is removed, the hardness testing module controls the color panoramic camera module to move to the height of the sample clamp, and the sample hardness is tested;
step S4: in the testing process, the indentation reading module is started, and the indentation reading precision is analyzed and controlled by an indentation reading method and is output to the hardness testing module;
step S5: the hardness testing module tests and captures detection data, and the hardness calculation output module outputs a Vickers hardness calculation result of the sample to finish the Vickers hardness test.
Step S2 further includes the steps of:
step S21: after a test force is applied to the sample, the multi-level range sensor module controls the maximum range sensor to monitor the loading test force;
step S22: the grading reading submodule reads a maximum measuring range sensor to monitor a loading test force value, when the currently monitored loading test force value is less than 10% of the maximum measuring range, the central control protection unit cancels the protection of the secondary measuring range sensor, and the grading force control unit controls the next-level measuring range sensor which is compared with the previous measuring range to monitor the loading test force;
step S23: and step S22 is repeated until the loading test force value monitored currently is more than or equal to 10% of the measuring range of the current sensor, and the grading reading submodule reads the loading test force value monitored currently by the sensor.
Step S23 further includes the steps of:
step S231: when the loading test force value is more than or equal to 10% of the current sensor measuring range, the grading reading sub-module further reads the specific loading test force value in a grading way from a high digit to a low digit, and the specific loading test force value is sequentially matched and presented on the corresponding position of the test force loading display module;
step S232: when the grading reading sub-module reads the lowest bit of the current loading test force value, which does not reach the lowest bit of the test force loading precision, the precision of the loading test force value displayed by the test force loading display module does not reach the set precision, and the grading force control unit controls the lowest bit of the current sensor to be rounded and controls the corresponding loaded force value to be loaded;
step S233: starting a small-range sensor in an interval where the lowest position of the current sensor measuring range is located, measuring a residual loading test force value by the small-range sensor under the corresponding bearing force to obtain a more accurate value, and adding the more accurate value and the corresponding bearing force value to obtain a loading test force value with higher accuracy;
step S234: sequentially matching and presenting the numerical values with higher precision on the corresponding orders of the test force loading display module, so that the finally measured lowest order of the loading test force numerical value reaches the lowest order of the test force loading precision; finally, the problem of test force loading precision is solved through the superposition use of the small-range multi-sensor.
Step S3 further includes the steps of:
step S31: the color panoramic camera module automatically shoots an image of a sample;
step S32: dragging the test sequence point to a preset position by a capture module, and automatically correcting the position of the starting point of the test sequence;
step S33: the learning control module executes according to the applicable hardness test standard and sets a control of learning to create a plurality of samples and a plurality of sequences, an automatic minimum interval, and an optimal stop time.
The indentation reading method in step S4 further includes the steps of:
step S41: in the test process, the electric zoom unit drives the color panoramic camera module to zoom electrically, so that the picture shot by the color panoramic camera module can be adjusted at 1-1000 times, and the real-time picture is aligned with the focus by observing a computer; the difficulty in accurate control during manual operation is avoided, and the definition of an indentation shooting picture is improved;
step S42: the reflected light collection module receives reflected light of the surface of the sample captured during shooting and captures the reflection angle of the collected light;
step S43: counting the light reflection angle data of each position, determining an area with a small dispersion degree of the light reflection angle as an indentation area, and finally identifying a total indentation area according to a current indentation reading method; because the indentation area of the surface of the sample is subjected to the extrusion force of the test pressure head, the smoothness of the surface of the indentation area is larger than that of the area which is not extruded by the test pressure head, so that the angle dispersion degree is smaller when the light of the indentation area is reflected, and the light tends to mirror reflection, the requirement on sample preparation when the non-optimal sample surface is subjected to hardness test can be effectively reduced, the requirement on the smoothness of the sample surface is greatly reduced, and indentation identification can be carried out under the condition that the quality of the sample surface is poor;
step S44: the straightness acquisition module acquires the contour of the indentation area, finds the part with higher definition of the four-side contour, fits the contour line of the indentation area, respectively prolongs the contour line of the indentation area, and determines each intersection point of the extension lines as an indentation vertex;
step S45: the indentation judgment module identifies and judges an indentation area of the current sample after correction; the corrected indentation area further improves the accuracy of indentation reading, so that the calculation accuracy of the Vickers hardness of the sample is improved.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. An indentation reading method of a micro Vickers hardness tester adopts the following testing equipment including the micro Vickers hardness tester, and is characterized in that: the micro Vickers hardness meter adopts a hardness testing system when reading an indentation, the hardness testing system comprises a hardness testing module, an indentation reading module, a loading precision control module and a hardness calculation output module, the hardness testing module is used for testing the Vickers hardness value of a sample, the indentation reading module is used for controlling the indentation reading precision in the testing process, the loading precision control module is used for controlling the loading precision of a testing force, the hardness calculation output module is used for calculating the Vickers hardness value of the output sample, the hardness testing module is electrically connected with the indentation reading module and the loading precision control module, and the indentation reading module is electrically connected with the uniform hardness calculation output module of the loading precision control module.
2. The method for reading indentations in a micro vickers hardness tester according to claim 1, wherein: the hardness testing module comprises a color panoramic camera shooting module, a capturing module and a learning control module, wherein the color panoramic camera shooting module is used for shooting image information of a sample, the capturing module is used for automatically correcting the initial point position of a testing sequence, and the learning control module is used for learning and controlling hardness testing according to a testing program.
3. The method for reading indentations in a micro vickers hardness tester according to claim 2, wherein: the indentation reading module comprises an electric zooming unit, a reflected light collecting module, a straightness collecting module and an indentation judging module, wherein the electric zooming unit is electrically connected with the color panoramic camera module, the electric zooming unit is used for controlling the zooming multiple of the color panoramic camera module, the reflected light collecting module is used for collecting the reflected light of the indentation on the surface of the sample, the straightness collecting module is used for collecting the straightness of the indentation on the surface of the sample, the indentation judging module is electrically connected with the reflected light collecting module and the straightness collecting module, and the indentation judging module is used for identifying and judging the indentation on the surface of the sample.
4. The method for reading indentations in a micro vickers hardness tester according to claim 3, wherein: the loading precision control module comprises a multi-stage range sensor module and a test force loading display module, wherein the multi-stage range sensor module is used for measuring test force in a grading manner, and the test force loading display module is used for analyzing and displaying a loading test force value;
the multi-level range sensor module comprises a grading reading submodule, a grading force control unit and a central control protection unit, wherein the grading reading submodule is used for reading the value of a sensor in a grading mode, the grading force control unit is used for controlling the measurement limit value of the sensor in a grading mode, and the central control protection unit is used for limiting the measurement value of the protection sensor.
5. The method for reading indentations in a micro vickers hardness tester according to claim 4, wherein: the operation process of the hardness testing system and the indentation reading method mainly comprise the following steps:
step S1: placing the sample on a sample clamp of a micro Vickers hardness tester, and starting a hardness testing system;
step S2: the loading precision control module is started to control the starting of the testing pressure head and apply a testing force to the sample, and the multi-level range sensor module monitors the loading testing force and calculates and displays a loading force value by the testing force loading display module;
step S3: the testing force is removed, the hardness testing module controls the color panoramic camera module to move to the height of the sample clamp, and the sample hardness is tested;
step S4: in the testing process, the indentation reading module is started, and the indentation reading precision is analyzed and controlled by an indentation reading method and is output to the hardness testing module;
step S5: the hardness testing module tests and captures detection data, and the hardness calculation output module outputs a Vickers hardness calculation result of the sample to finish the Vickers hardness test.
6. The method for reading indentations in a micro vickers hardness tester according to claim 5, wherein: the step S2 further includes the steps of:
step S21: after a test force is applied to the sample, the multi-level range sensor module controls the maximum range sensor to monitor the loading test force;
step S22: the grading reading submodule reads a maximum measuring range sensor to monitor a loading test force value, when the currently monitored loading test force value is less than 10% of the maximum measuring range, the central control protection unit cancels the protection of the secondary measuring range sensor, and the grading force control unit controls the next-level measuring range sensor which is compared with the previous measuring range to monitor the loading test force;
step S23: and step S22 is repeated until the loading test force value monitored currently is more than or equal to 10% of the measuring range of the current sensor, and the grading reading submodule reads the loading test force value monitored currently by the sensor.
7. The method for reading indentations in a micro vickers hardness tester according to claim 6, wherein: the step S23 further includes the steps of:
step S231: when the loading test force value is more than or equal to 10% of the current sensor measuring range, the grading reading sub-module further reads the specific loading test force value in a grading way from a high digit to a low digit, and the specific loading test force value is sequentially matched and presented on the corresponding position of the test force loading display module;
step S232: when the grading reading sub-module reads the lowest bit of the current loading test force value, which does not reach the lowest bit of the test force loading precision, the precision of the loading test force value displayed by the test force loading display module does not reach the set precision, and the grading force control unit controls the lowest bit of the current sensor to be rounded and controls the corresponding loaded force value to be loaded;
step S233: starting a small-range sensor in an interval where the lowest position of the current sensor measuring range is located, measuring a residual loading test force value by the small-range sensor under the corresponding bearing force to obtain a more accurate value, and adding the more accurate value and the corresponding bearing force value to obtain a loading test force value with higher accuracy;
step S234: and sequentially matching and presenting the numerical values with higher precision on the corresponding order of the test force loading display module, so that the finally measured lowest order of the loading test force numerical value reaches the lowest order of the test force loading precision.
8. The method for reading indentations in a micro vickers hardness tester according to claim 7, wherein: the step S3 further includes the steps of:
step S31: the color panoramic camera module automatically shoots an image of a sample;
step S32: dragging the test sequence point to a preset position by a capture module, and automatically correcting the position of the starting point of the test sequence;
step S33: the learning control module executes according to the applicable hardness test standard and sets a control of learning to create a plurality of samples and a plurality of sequences, an automatic minimum interval, and an optimal stop time.
9. The method for reading indentations in a micro vickers hardness tester according to claim 8, wherein: the indentation reading method in step S4 further includes the steps of:
step S41: in the test process, the electric zoom unit drives the color panoramic camera module to zoom electrically, so that the picture shot by the color panoramic camera module can be adjusted at 1-1000 times, and the real-time picture is aligned with the focus by observing a computer;
step S42: the reflected light collection module receives reflected light of the surface of the sample captured during shooting and captures the reflection angle of the collected light;
step S43: counting the light reflection angle data of each position, determining an area with a small dispersion degree of the light reflection angle as an indentation area, and finally identifying a total indentation area according to a current indentation reading method;
step S44: the straightness acquisition module acquires the contour of the indentation area, finds the part with higher definition of the four-side contour, fits the contour line of the indentation area, respectively prolongs the contour line of the indentation area, and determines each intersection point of the extension lines as an indentation vertex;
step S45: and the indentation judgment module identifies and judges the corrected indentation area of the current sample.
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