Method of localization of inclusions in diamond

FIELD: testing of precious stones.

SUBSTANCE: diamond is fixed onto holder and tested under specified angle for getting image. Then second measurement is made for getting two sets of data calculated by means of computer. The second set of data can be received by means of measurement of depth or due to changing direction of viewing.

EFFECT: improved precision of localization.

6 cl, 2 dwg

 

The invention relates to a method and apparatus for localization of the inclusions in the diamond.

Up to the present time to determine inclusions in diamonds used several ways (GB 2081439, US 4152069), and they all have disadvantages associated with the difficulty of localization of the inclusions with respect to the outer surface of the diamond. Mainly, can be obtained two-dimensional image of the diamond, which will lead to inaccurate localization of such inclusions.

The purpose of the invention is to overcome the aforementioned disadvantages, and the method according to the invention is characterized by the fact that the diamond is fixed on the holder, specified the diamond in the holder investigate (measured) at a predefined angle to get the image, then perform the second measurement to obtain two sets of data, calculated on a computer, for localization of the inclusion relative to the outer surface of the specified diamond. According to the first variant implementation of the invention, the method also differs in that the diamond is fixed on the holder, with the specified diamond carrier detect under a predefined angle to obtain the reference image, then perform the change of direction, which carried out the study of the diamond at least once to get the changes, while image data of EIT is it in the computer to calculate a three-dimensional image, including one or each time relative to the reference.

After making a clear localization of the inclusion relative to the outer surface of the diamond indicated the diamond can be easily cut on the optimal plane is computed using a computer. Specified the optimal plane passes through the inclusion so that when cut diamond inclusion disappears.

Although the viewing direction relative to the diamond can be realized by changing the position of the scanner, and so forth, according to the invention it is easier to do a rotation and/or movement of the holder with the diamond in relation to the fixed direction of observation.

In addition, one of the purposes of the invention consists in the introduction of the correction coefficient associated with the refractive index of diamond, which should be taken into account when calculating, in the case where the scanning direction deviates from the direction of observation perpendicular to the surface of the diamond.

For a simpler implementation of accurate localization and/or determine the volume of the inclusions in the diamond, you can use the optical cylinder, the diameter and the direction of detection is used for calculation on the computer.

According to another implementation variant of the invention, the inclusion can be localized using the scanner with the device on which I focus, to obtain depth positions along the specified direction of observation by focusing specified inclusion.

The invention is illustrated by the following description of embodiments of the invention, which consists in the localization of the inclusions in the diamond.

The drawings show:

figure 1 is a perspective view of embodiments of the invention, illustrating the scanning of the diamond in the holder;

on figa, b, C, D is a schematic representation of the successive stages of a preferred method according to the invention.

1 shows a housing 1, which contains the holder 2 on which is fixed diamond D. Via a suitable actuator can be rotation of the holder and/or the movement of a holder for placing the diamond on the optical axis A, which is the optical axis of the projection light beam 7 is projected through a diamond on a semi-permeable mirror, reflecting the image of the diamond on the microscope and/or camera 3 and the scanner 4.

When projecting light it is possible to set the holder 2 in the correct position relative to the scale of the microscope manually performed by the operator. The scanner 4 is used to obtain the necessary data for the specified image and use the data in calculations on the computer.

Figure 2 presents the implementation of n is how many stages of implementation of the method according to the invention.

a) Carry out the fixation of the diamond on the table and set the scanner 4 from the outer surface of the stone in an arbitrary initial position. The coordinates of this position - X0, Y0, Z0that α0that β0that γ0.

i) Carry out the rotation of the stone to make the necessary inclusion visible through a microscope (with changing the eyepiece).

b) Carry out the move included in the position before the scale of the microscope. The operator is investigating the stone through the microscope, makes it, adjusting table. Made the move X1, Y1, Z1and rotation α1that β1that γ1diamond on the table record based on its initial position. Determine the face (in her normal α1that β1that γ1), through which the inclusion is visible. Single cylinder (or line) so that the inclusion was within the specified cylinder (or met the specified line). The same procedure (stages a and b) carry out several different positions

c) Various locations see or browse through the different facets of a diamond, or browsing through the same face, but in different directions. Register a different set of displacements and rotations: X2...Xn, Y2...Yn, Z2...Znthat α2...αnthat β2...β nthat γ2...γn.

d) the location of the inclusions within the diamond is calculated from registered displacements and rotations, scanning the outer surface and the refractive index of diamond. The position of the inclusion is defined as the nearest point of intersection of lines or cylinders created in stage b. Glyph of turn 8 is projected in the scanned image.

The invention is not limited to the above method. For example, the crosshair (scale) of the microscope, you can replace the "coordinate map, thereby avoiding displacement of the holder in each viewing direction.

1. The method of localization of inclusions in diamond (D), in which the fixing of the diamond in the holder (2), carry out a study of the diamond (D) on the holder in the original position to obtain an image of the outer surface of the specified diamond, with registration of coordinates (X0, Y0, Z0that α0that β0that γ0) initial position, characterized in that conduct a study of inclusions in diamond, at least in first and second directions of observation, at least in the first and second position with coordinates (X1, Y1, Z1that α1that β1that γ1) (X2, Y2, Z2that α2, β2that γ2these coordinates are fed into the computer to implement the localization of the inclusion (8) with respect to the outer surface of the specified diamond (D).

2. The method according to claim 1, characterized in that the carry rotation and/or displacement of the holder (2) diamond (D) to ensure the direction of observation.

3. The method according to claim 1 or 2, characterized in that when the deviation of the direction of observation of the 90° relative to the surface of the diamond impose corrective coefficient which is a function of the refractive index of the diamond when carrying out calculations by computer.

4. The method according to any of the preceding paragraphs, characterized in that the direction of viewing is such that the inclusion or each time (8) is enclosed in an optical cylinder, diameter and direction detection which is used when carrying out calculations by computer.

5. The method of localization of inclusions in diamond (D), in which the fixing of the diamond in the holder (2), carry out a study of the diamond (D) on the holder in the direction of observation to obtain an image of the outer surface of the specified diamond, characterized in that for obtaining depth positions along the direction of observation of the diamond by focusing specified inclusion (8) use the scanner (4) with the focusing means, the ri data position and depth of the images are fed into the computer for the localization of the inclusion (8) relative to the outer surface of the specified diamond (D).



 

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