CN114674372B - Pearl multi-grading parameter synchronous measurement device and method based on multi-azimuth observation - Google Patents

Abstract

The invention discloses a pearl multi-grading parameter synchronous measurement device and method based on multi-directional observation, comprising a turntable, a surface measurement component, a shape measurement component, a standard plate and a main detection component; the top of the turntable is provided with a table for placing pearls; Both the surface measurement component and the shape measurement component can be moved around the turntable, and the surface measurement component has a surface light source end, and the shape measurement component has a shape measurement light source end; the standard plate is set on the back of the turntable. One side of the measurement assembly; the main detection assembly faces the turntable and measures the index parameters of the pearl. It solves the functional practicability caused by the absence of a device and method capable of simultaneous quantitative measurement of multiple parameters of pearl gloss, smoothness, color, size, and shape in the prior art, and the smoothness can only be judged by human eyes. Not high, low detection accuracy technical problems.

Description

Device and method for synchronous measurement of pearl multi-grading parameters based on multi-directional observation

technical field

The invention relates to the technical field of pearl detection and grading equipment, in particular to a device and method for synchronously measuring pearl multi-grading parameters based on multi-directional observation.

Background technique

Pearls are ancient organic gemstones. Scientific and efficient grading and evaluation of pearl quality is of great significance to the high-quality development of the domestic pearl industry. According to the national standard GB/T 18781-2008 "Pearl Grading", the quality grading indicators of pearls include: color, size, shape, luster, smoothness, and pearl layer thickness. The division standards for gloss and smoothness mainly rely on human eye observation and sensory evaluation.

In order to improve the efficiency of quality grading, the automatic grading methods and systems of pearls are constantly innovating. Most of the patents and documents that have been issued so far are only for the observation of pearl luster. For example: the Chinese invention patent "A device and method for detecting and grading pearls" with the publication number CN102608076A and the Chinese utility model patent "A device for detecting and grading pearls" with the publication number CN202522515U introduce the ability to achieve pearl luster. The grading device for degree, shape and size detection uses the principle of confocal to obtain the light and dark difference image of the pearl surface and realizes the pearl luster grading through observation, but this device cannot realize the measurement of the surface finish (roughness and defect degree) of the pearl and provide quantitative data.

It can be seen that in the pearl grading process, the shape and size parameters are easy to realize quantitative measurement. However, there is currently no device and method on the market that can simultaneously and quantitatively measure the gloss, smoothness, color, size, and shape of pearls. In particular, the smoothness can only be judged by human eyes.

Contents of the invention

For this reason, the present invention provides a pearl multi-grading parameter synchronous measurement device and method based on multi-directional observation, to solve the problem that in the prior art, it is not possible to synchronize multiple parameters of pearl gloss, smoothness, color, size and shape. The device and method of quantitative measurement, as well as the smoothness, can only be judged by human eye observation, which leads to technical problems of low functional practicability and low detection accuracy.

In order to achieve the above object, the present invention provides the following technical solutions:

A synchronous measurement device for pearl multi-grading parameters based on multi-directional observation, including a turntable, a surface measurement component, a shape measurement component, a standard plate and a main detection component;

The top of the turntable is provided with a table for placing pearls;

Both the surface measurement component and the profile measurement component can be movably arranged on the periphery of the turntable, and the surface measurement component has a surface light source end, the profile measurement component has a profile measurement light source end, the Both the surface light source end and the shape measurement light source end are correspondingly facing the turntable for illuminating pearls;

The standard plate is arranged on the side of the turntable facing away from the surface measurement component and the profile measurement component, and the standard plate forms reflected light when the surface light source and the profile measurement light source irradiate the pearl;

The main detection component is arranged between the surface measurement component and the shape measurement component, and the main detection component is correspondingly facing the turntable, and the main detection component receives the light spot signal from the pearl and the pearl and the The reflected light of the standard plate is combined with the standard plate to calibrate the index parameters of the pearl.

On the basis of above-mentioned technical scheme, the present invention is described further as follows:

As a further solution of the present invention, a main control computer is also included.

The control input end of the main control computer is connected to the detection component through a circuit, and the index parameters received from the detection component are automatically controlled by the main control computer and displayed and graded.

As a further solution of the present invention, guide rails are also included.

The turntable rotates based on a vertical central axis, the guide rail is an arc or ring guide rail, and the arc or ring guide rail is arranged around the turntable around the turntable center axis.

The surface measuring component and the shape measuring component are respectively slidably arranged on the guide rail.

As a further solution of the present invention, the surface measurement assembly includes a surface measurement slide table and a surface light source fixed to the surface measurement slide table.

The surface measurement slide table is slidably arranged on the guide rail, the surface light source faces the central axis of the turntable, and the pearl is irradiated by the surface light source to form a surface light source spot on the surface of the pearl.

The main detection component acquires the light spot of the surface light source, and calculates the glossiness parameter of the pearl.

As a further solution of the present invention, the profile measurement component includes a profile measurement slide table and a profile measurement light source fixed to the profile measurement slide table.

The profile measuring slide table is slidably arranged on the guide rail, and the profile measuring light source faces the central axis of the turntable. The profile measuring light source irradiates the pearl to form a profile light spot on the surface of the pearl.

The main detection component acquires the light spot of the topography light source, and calculates the smoothness parameter of the pearl.

As a further solution of the present invention, the main detection assembly includes a main detection sliding table and a main detector fixed to the main detection sliding table; the main detection sliding table is slidably arranged on the guide rail, and the main detector Facing the turntable, the light spot signal from the pearl and the reflected light from the pearl and the standard plate are received by the main detector.

As a further solution of the present invention, the standard board includes a gloss board, a standard white board, a linear ruler and a standard step.

The gloss plate is used to calibrate the gloss measurement result of the main detector.

The standard white board is used to calibrate the color measurements of the primary detector.

The linear scale is used to calibrate the size and roundness measurements of the main detector.

The standard steps are used to calibrate the smoothness measurement results of the main detector.

As a further solution of the present invention, guide rails are also included.

The turntable rotates based on a vertical central axis, the guide rail is an arc or ring guide rail, and the arc or ring guide rail is arranged around the turntable around the turntable center axis.

The surface measurement component and the main detection component are respectively slidably arranged on the guide rail.

The profile measurement component is separated from the guide rail, and the profile measurement component includes an electronically controlled translation platform and a profile measurement module fixedly connected to the electronically controlled translation platform.

The shape measurement module performs translation control and positioning on the shape measurement module through the electronically controlled translation stage, and the shape measurement module scans the shape structure of the pearl surface.

As a further solution of the present invention, the profile measurement module includes a profile measurement light source and a profile detector, the profile measurement light source and the profile detector both face the turntable, and the profile probe obtains The shape measurement light source forms a linear shape light spot on the surface of the pearl to obtain the smoothness parameters of the pearl, and at the same time the shape detector receives the reflected light irradiated by the shape measurement light source on the pearl surface.

A method for synchronously measuring pearl multi-grading parameters based on multi-directional observation, including the following process:

S1: Place pearls on the top of the turntable;

S2: The pearl is irradiated by the movable surface light source and the movable shape measurement light source respectively, and the surface light source light spot and the linear shape light source light spot are respectively formed on the surface of the pearl;

S3: The pearl and the standard plate located on the back side of the illuminated pearl produce reflected light;

S4: Receive the light spot signal from the pearl and the reflected light from the pearl and the standard plate through the detector, and calculate the various index parameters of the pearl;

S5: Calibrate the index parameter measurement results of the detector through the standard board;

S6: The main control computer displays the roundness, size, luster, smoothness, color and other parameters of the tested pearls in real time, and grades and grades the tested pearls according to the above parameters.

The present invention has following beneficial effect:

1. For the first time, this device realizes the comprehensive measurement of pearl gloss and surface smoothness parameters, and also the measurement of parameters such as size, roundness, and chromaticity, and realizes comprehensive pearl parameter testing and grade verification.

2. Use dual light sources to irradiate the tested pearls. The surface light source can cooperate with the detector to realize the measurement of gloss parameters, and the shape measurement light source can cooperate with the detector to realize the measurement of surface smoothness.

3. The pearl sample is rotated by the turntable, and the arc-shaped guide rail drives the light source and the detector to rotate, which can realize the multi-angle comprehensive measurement of the pearl sample.

4. Using gloss boards, standard white boards, line rulers and standard steps as standard boards can realize the calibration of equipment parameters and ensure the accuracy and long-term stability of equipment measurements.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. The structures and proportions shown in this specification , size, etc., are only used to cooperate with the content disclosed in the manual, so that people familiar with this technology can understand and read. Any modification of structure, change of proportional relationship or adjustment of size will not affect the effect of the present invention. And the goals that can be achieved should still fall within the scope of the technical content disclosed in the present invention.

Fig. 1 is a schematic diagram of the overall structure of a pearl multi-grading parameter synchronous measurement device based on multi-directional observation provided by Embodiment 1 of the present invention.

Fig. 2 is a schematic diagram of the overall structure of a pearl multi-grading parameter synchronous measurement device based on multi-directional observation provided by Embodiment 2 of the present invention.

In the accompanying drawings, the list of parts represented by each label is as follows:

Turntable 1; Guide rail 2;

Surface measurement component 3: surface measurement slide table 31, surface light source 32;

Shape measurement component 4: shape measurement slide table 41, shape measurement light source 42, electronically controlled translation stage 43, shape measurement module 44, shape detector 45;

Main detection component 5: main detection sliding table 51, main detector 52;

Standard board 6; main control computer 7: driver 71;

Pearl 9; surface light source spot a, shape light source spot b.

Detailed ways

The implementation mode of the present invention is illustrated by specific specific examples below, and those who are familiar with this technology can easily understand other advantages and effects of the present invention from the contents disclosed in this description. Obviously, the described embodiments are a part of the present invention. , but not all examples. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Terms such as "upper", "lower", "left", "right", and "middle" quoted in this specification are only for convenience of description, and are not used to limit the scope of implementation of the present invention. The change or adjustment of the relationship shall also be regarded as the applicable scope of the present invention without substantive change in the technical content.

Example 1

As shown in Figure 1, the embodiment of the present invention provides a synchronous measurement device for pearl multi-grading parameters based on multi-directional observation, including a turntable 1, a guide rail 2, a surface measurement component 3, a shape measurement component 4, a standard plate 6, a main The detection component 5 and the main control computer 7 are used to form a high-light spot signal on the surface of the pearl 9 through the surface measurement component 3, and the main detection component 5 calculates the glossiness parameter of the pearl 9 according to the high-light spot signal, and at the same time, the profile measurement component 4 is used to The topography light source spot is formed on the surface of the pearl 9, and the surface shape and roughness of the pearl 9 are calculated by the main detection component 5 according to the topography light source spot, so as to obtain the smoothness parameter of the pearl 9; the reflection of the pearl 9 can also be obtained through the main detection component 5 Spectrum or red, green and blue components of light, and then the color of pearl 9 can be calculated; in addition, when performing the above measurement, pearl 9 is arranged on turntable 1, and utilizes the arc or ring guide rail 2 around the periphery of turntable 1 to slide and set respectively The surface measurement component 3, the shape measurement component 4 and the main detection component 5 can effectively realize the multi-directional parameter observation of the pearl 9, and can automatically complete the measurement of glossiness and smoothness parameters under different geometric conditions. Therefore, in the actual pearl detection process, multiple grading indicators of the pearl 9 are simultaneously observed and quantitative data is provided, which greatly improves the efficiency and scientific nature of the grading process, and enhances the functionality. The specific settings are as follows:

Please refer to Fig. 1, the turntable 1 can rotate based on a vertical central axis, and the top of the turntable 1 is provided with a table for placing pearls 9; the guide rail 2 is an arc or ring guide rail 2, and the arc or The annular guide rail 2 is arranged around the periphery of the turntable 1 with the central axis of the turntable 1 as a center.

The surface measurement component 3 and the shape measurement component 4 are respectively slidably arranged on the guide rail 2, so that the surface measurement component 3 and the shape measurement component 4 can rotate around the measured pearl 9 as the center of circle.

Specifically, the surface measurement assembly 3 includes a surface measurement slide table 31 and a surface light source 32 fixed to the surface measurement slide table 31; wherein, the surface measurement slide table 31 is slidably arranged on the guide rail 2, so The surface light source 32 faces the central axis of the turntable 1 and is used to illuminate the tested pearl 9 through the surface light source 32 and form a high-gloss surface light spot a on the surface of the pearl 9 .

The shape measurement component 4 includes a shape measurement sliding table 41 and a shape measurement light source 42 fixed to the shape measurement sliding table 41; wherein, the shape measurement sliding table 41 is slidably arranged on the guide rail 2 , the shape measurement light source 42 faces the central axis of the turntable 1, and is used to illuminate the measured pearl 9 through the shape measurement light source 42 and form a shape light source spot b on the surface of the pearl 9.

The profile measurement light source 42 may be, but not limited to, a line projection light source and a ring light source.

The main detection assembly 5 is slidably arranged on the guide rail 2 , and the main detection assembly 5 is located between the surface measurement assembly 3 and the profile measurement assembly 4 .

The standard plate 6 is arranged on the side of the turntable 1 facing away from the surface light source 32 and the profile measurement light source 42, and there is a predetermined distance between the standard plate 6 and the turntable 1 for passing The standard plate 6 further forms reflected light when the surface light source 32 and the shape measurement light source 42 irradiate the measured pearl 9 , and transmits it to the main detection assembly 5 , so as to calibrate the measurement result of the main detection assembly 5 .

Specifically, the main detection assembly 5 includes a main detection sliding table 51 and a main detector 52 fixed to the main detection sliding table 51; wherein, the main detection sliding table 51 is slidably arranged on the guide rail 2, so that The main detector 52 faces the turntable 1, receives the light spot signal from the tested pearl 9 and the reflected light from the tested pearl 9 and the standard plate 6 through the main detector 52, and calculates the index parameters of the tested pearl 9 based on this.

More specifically, the main detector 52 acquires the high-gloss surface light source spot a signal formed by the surface light source 32 on the surface of the tested pearl 9 to calculate the gloss parameter of the tested pearl 9; the main detector 52 acquires the shape The shape measurement light source 42 forms the linear shape light spot b signal on the surface of the tested pearl 9 to calculate the surface shape and roughness of the tested pearl 9, thereby obtaining the smoothness parameter of the tested pearl 9.

The main detector 52 obtains the edge image information of the shape of the measured pearl 9 by means of the surface light source 32 or the profile measurement light source 42 or the background light of the measurement environment, and uses the fitting circle diameter of the edge of the measured pearl 9 as the size of the measured pearl 9 , taking the RMS value between the edge of the measured pearl 9 and the fitting circle as its roundness parameter.

The main detector 52 also acquires the spectrum or the red, green and blue components of the reflected light of the tested pearl 9 , and calculates the color of the tested pearl 9 based on this.

It should be noted that the main detector 52 may be, but not limited to, an imaging luminance meter, a multispectral camera, a hyperspectral camera, a camera, or a video camera.

Described standard plate 6 comprises glossiness plate, standard whiteboard, linear scale and standard step; Wherein, described glossiness plate is used for the gloss measurement result of calibration described main detector 52; Described standard whiteboard is used for calibration. The color measurement result of the main detector 52 is marked; the line ruler is used to calibrate the size and roundness measurement results of the main detector 52; the standard step is used for the calibration of the surface finish detection result.

The control input terminal of the main control computer 7 is connected to the main detector 52 through a circuit, so as to display parameters such as roundness, size, luster, smoothness, color and the like of the measured pearl 9 in real time through the main control computer 7, And according to the above parameters, the measured pearl 9 is scored and graded.

Example 2

In Embodiment 2, for the same structure as in Embodiment 1, the same symbol is given, and the same description is omitted. The difference between Embodiment 2 and Embodiment 1 is:

As shown in FIG. 2 , the shape measuring assembly 4 is separated from the guide rail 2 , and the shape measuring assembly 4 includes an electronically controlled translation stage 43 and a shape that is affixed to the electronically controlled translation stage 43 . Profile measurement module 44, the profile measurement module can use but not limited to profilometer, confocal microscope, interference microscope, in order to realize the translation control positioning of profile measurement module 4 through electronically controlled translation stage 43, and The topography measurement module 44 realizes the scanning of the surface topography structure of the tested pearl 9 .

Specifically, the shape measurement module 44 includes a shape measurement light source 42 and a shape detector 45, the shape measurement light source 42 and the shape detector 45 are both facing the turntable 1, for The shape detector 45 obtains the shape measurement light source 42 to form a linear shape light spot b on the surface of the measured pearl 9, so as to calculate the surface shape and roughness of the measured pearl 9, and obtain the smoothness parameter of the measured pearl 9, and at the same time The reflected light irradiated on the surface of the measured pearl 9 by the topography measurement light source 42 is received by the topography detector 45 .

The control output terminal of the main control computer 7 is connected with a driver 71 through a circuit, and the driver 71 is connected with the electronically controlled translation platform 43 through a circuit, so that the main control computer 7 can control the electronically controlled translation through the driver 71 The stage 43 moves, so that the shape measurement module 44 scans the measured pearl 9 to obtain the shape information of the shape of the measured pearl 9, and the diameter of the fitted circle of the shape of the measured pearl 9 is used as the size of the measured pearl 9. The RMS value between the shape of the tested pearl 9 and the fitting circle is used as its roundness parameter.

A method for synchronously measuring pearl multi-grading parameters based on multi-directional observation, including the following process:

S1: Place pearl 9 on the top of turntable 1;

S2: respectively irradiating the pearl 9 with the movable surface light source 32 and the movable shape measurement light source 42, and correspondingly forming a surface light source spot a and a linear shape light source spot b on the surface of the pearl 9;

S3: the pearl 9 and the standard plate 6 located on the back side of the illuminated pearl 9 produce reflected light;

S4: Receive the light spot signal from the pearl 9 and the reflected light from the pearl 9 and the standard plate 6 through the detector, and calculate the various index parameters of the pearl 9;

Specifically, the surface light source spot a signal formed by the surface light source 32 on the surface of the pearl 9 is obtained by the detector, and the glossiness parameter of the measured pearl 9 is calculated;

Obtaining the linear shape light spot b signal formed by the shape measurement light source 42 on the surface of the pearl 9 through the detector, calculating the surface shape and roughness of the pearl 9, and obtaining the smoothness parameter of the pearl 9;

Obtain the spectrum or the red, green and blue components of the reflected light of the pearl 9 through the detector, so as to calculate the color of the pearl 9;

Obtain the edge image information of pearl 9 shape by means of surface light source 32 or profile measurement light source 42 or measure ambient background light by detector, take the fitting circle diameter of pearl 9 edge as the size of pearl 9, take pearl 9 edge and fitting circle The RMS value between is used as the roundness parameter of pearl 9;

S5: Calibrate the index parameter measurement results of the detector through the standard board 6;

Specifically: the glossiness measurement result of the detector is calibrated through the glossiness plate in the standard plate 6;

The smoothness measurement result on the surface of the pearl 9 is calibrated by the standard step in the standard plate 6;

Calibrate the color measurement results of the detector by a standard white board in the standard board 6;

The size and roundness measurement results of the detector are calibrated by the linear scale in the standard plate 6;

S6: The main control computer 7 displays the roundness, size, luster, smoothness, color and other parameters of the tested pearl 9 in real time, and scores and grades the tested pearl 9 according to the above parameters.

Although the present invention has been described in detail with general descriptions and specific examples above, it is obvious to those skilled in the art that some modifications or improvements can be made on the basis of the present invention. Therefore, the modifications or improvements made on the basis of not departing from the spirit of the present invention all belong to the protection scope of the present invention.

Claims (9)

1. A multi-grading parameter synchronous measurement device for pearls based on multi-azimuth observation is characterized by comprising a rotary table, a surface measurement component, a morphology measurement component, a standard plate and a main detection component;

the top of the rotary table is provided with a table top for placing pearls;

the surface measuring assembly and the morphology measuring assembly can be movably arranged on the periphery of the rotary table, the surface measuring assembly is provided with a surface light source end, the morphology measuring assembly is provided with a morphology measuring light source end, and the surface light source end and the morphology measuring light source end face the rotary table correspondingly and are used for irradiating pearls;

the standard plate is arranged on one side of the rotary table, which is opposite to the surface measuring component and the appearance measuring component, and the standard plate forms reflected light when the surface light source and the appearance measuring light source irradiate pearls;

the main detection assembly is arranged between the surface measurement assembly and the appearance measurement assembly, faces the rotary table correspondingly, receives light spot signals from pearls and reflected light of the pearls and the standard plate, and calibrates index parameters of the pearls by combining the standard plate;

the appearance measuring component comprises an electric control translation table and an appearance measuring module fixedly connected to the electric control translation table;

the appearance measuring module is a profile measuring instrument and/or a confocal microscope and/or an interference microscope;

the appearance measuring module performs translation control positioning on the appearance measuring module through the electric control translation table, and the appearance measuring module scans the appearance structure of the surface of the pearl;

the main detection assembly comprises a main detection sliding table and the main detector is fixedly connected to the main detection sliding table;

the standard plate comprises a glossiness plate, a standard white plate, a line ruler and a standard step;

the glossiness plate is used for calibrating the glossiness measurement result of the main detector;

the standard white board is used for calibrating the color measurement result of the main detector;

the line ruler is used for calibrating the measurement result of the size and the roundness of the main detector;

the standard step is used for calibrating the finish measurement result of the main detector.

2. The multi-dimensional observation-based pearl multi-grade parameter synchronous measurement device according to claim 1, further comprising a master control computer;

the control input end of the main control computer is connected with the detection component through a circuit, and the main control computer automatically controls to receive the index parameters from the detection component, display and grade the index parameters.

3. The pearl multi-grading parameter synchronous measurement device based on multi-azimuth observation according to claim 1, further comprising a guide rail;

the turntable rotates based on a vertically arranged central shaft, the guide rail is an arc-shaped or annular guide rail, and the arc-shaped or annular guide rail is arranged around the periphery of the turntable by taking the central shaft of the turntable as a circle center;

the surface measuring assembly and the appearance measuring assembly are respectively arranged on the guide rail in a sliding manner.

4. The pearl multi-grading parameter synchronous measurement device based on multi-azimuth observation according to claim 3,

the surface measurement component comprises a surface measurement sliding table and a surface light source fixedly connected to the surface measurement sliding table;

the surface measurement sliding table is arranged on the guide rail in a sliding mode, the surface light source faces to the central shaft of the rotary table, pearls are irradiated through the surface light source, and surface light source light spots are formed on the surfaces of the pearls;

and the main detection assembly acquires the light spot of the surface light source and calculates the glossiness parameter of the pearl.

5. The multi-scale parameter synchronous measuring device for pearls based on multi-azimuth observation according to claim 3,

the appearance measuring component comprises an appearance measuring sliding table and an appearance measuring light source fixedly connected to the appearance measuring sliding table;

the appearance measuring sliding table is arranged on the guide rail in a sliding mode, the appearance measuring light source faces to the central shaft of the rotary table, the appearance measuring light source irradiates the pearl, and appearance light source light spots are formed on the surface of the pearl;

and the main detection assembly acquires the light spot of the morphology light source and calculates the fineness parameter of the pearl.

6. The pearl multi-grading parameter synchronous measurement device based on multi-azimuth observation according to claim 3,

the main detection sliding table is arranged on the guide rail in a sliding mode, the main detector faces the rotary table, and light spot signals from the pearls and reflected light of the pearls and the standard plate are received through the main detector.

7. The pearl multi-grading parameter synchronous measurement device based on multi-azimuth observation according to claim 1, further comprising a guide rail;

the turntable rotates based on a vertically arranged central shaft, the guide rail is an arc-shaped or annular guide rail, and the arc-shaped or annular guide rail is arranged around the periphery of the turntable by taking the central shaft of the turntable as a circle center;

the surface measuring assembly and the main detecting assembly are respectively arranged on the guide rail in a sliding manner;

the appearance measuring assembly and the guide rail are arranged in a separated mode.

8. The multi-dimensional observation based pearl multi-grade parameter synchronous measurement device according to claim 7,

the appearance measuring module comprises an appearance measuring light source and an appearance detector, the appearance measuring light source and the appearance detector face the rotary table, the appearance detector obtains linear appearance light source light spots formed on the surface of the pearl by the appearance measuring light source so as to obtain the finish parameters of the pearl, and meanwhile, the appearance detector receives reflected light irradiated to the surface of the pearl by the appearance measuring light source.

9. The synchronous measurement method of the pearl multi-grading parameter synchronous measurement device based on multi-azimuth observation according to claim 1, comprising the following steps:

s1: placing a pearl on the top of the rotary table;

s2: respectively irradiating pearls by a movable surface light source and a movable morphology measuring light source, and respectively and correspondingly forming surface light source light spots and linear morphology light source light spots on the surfaces of the pearls;

s3: the pearls and the standard plate positioned on the back side of the irradiated pearls generate reflected light;

s4: receiving a light spot signal from the pearl and reflected light of the pearl and the standard plate through a detector, and calculating each index parameter of the pearl according to the light spot signal and the reflected light;

s5: calibrating the index parameter measurement result of the detector through a standard plate;

s6: the main control computer displays the roundness, size, luster, smoothness and color parameters of the measured pearl in real time, and scores and grades the measured pearl according to the parameters.

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