Shape measurement of specular reflective surface

A technique for specular reflection and measurement of flat surfaces, applied in the field of the shape of objects

Inactive Publication Date: 2010-08-25
CORNING INC
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is not possible to uniquely determine the shape of a specular surface w

Method used

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  • Shape measurement of specular reflective surface
  • Shape measurement of specular reflective surface
  • Shape measurement of specular reflective surface

Examples

Experimental program
Comparison scheme
Effect test

Example

Example 1

Fig. 7B shows the shape measurement of the glass plate on the horizontal platform by the method described in conjunction with Figs. 2-6. By placing a disc under the glass, the shape of the glass plate is affected. The edge of the glass facing the target touches the table, which is used as the initial condition of the differential condition. The target has a striped pattern. FIG. 7A shows the reflection image 170 obtained from the stripe pattern 172. The reflection image 170 is used to obtain the above mapping relationship, as described above. For comparison, an optical displacement sensor installed on the track was also used to measure the distribution of the glass. Figure 7C shows the above result. As observed, there is agreement between the distributions shown in Figures 7B and 7C.

Example

Example 2

Figures 8 and 9 show the shapes of two different glass plates restored by the above method at different glass plate orientations on the measuring table. An array of displacement sensors along the right edge of the glass is used to obtain the initial conditions for the integration of the above differential equations. Figure 8 shows four measurements of the same glass plate at different orientations. Similarly, Figure 9 shows four measurements of the same glass plate at different orientations. Figures 8 and 9 show that the above method does not depend on the orientation of the glass plate.

In the description of FIG. 2 above, it was mentioned that at 108, the reflection image can be subdivided into multiple sub-regions, and a mapping relationship can be determined for each sub-region. There are two ways to explain this process. With a single camera, a single large reflection image can be taken and then subdivided into multiple sub-regions. In the case of using a sin...

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Abstract

A method of measuring a shape of a specular reflective surface is provided. A pattern displayed on a surface of a target positioned at a target plane is produced from a specular reflective surface positioned at a measurement plane. An image of the reflection is recorded at an imaging plane. Positions of a plurality of points on the specular reflective surface relative to the imaging plane are determined. A first relation between feature positions on the image of the reflection and feature positions on the pattern is determined. The shape of the specular reflective surface is determined from asecond relation involving a surface profile of the specular reflective surface and the first relation using the positions of the plurality of points as an initial condition.

Description

Shape measurement of specularly reflective surfaces priority This application claims priority to US Patent Application 12 / 391,585, filed February 24, 2009, entitled "Shape Measurement of Specular Reflective Surface." technical field The present invention generally relates to optical methods and apparatus for measuring the shape of objects. More particularly, the present invention relates to methods and apparatus for measuring the shape of objects having specularly reflective surfaces. Background technique The fusion drawing process is used to create sheets of material from molten material such as molten glass (see US Patent 3,338,696 and US Patent 3,682,609). Generally, the melt drawing process includes: delivering molten material into a trough; and allowing the molten material to spill down the sides of the trough in a controlled manner. The separate streams of material flowing down the sides of the trough are combined at the bottom of the trough into a single stream...

Claims

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Application Information

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IPC IPC(8): G01B11/24C03B23/02
CPCH04N7/18C03B17/064G01B11/2513G01B11/25G01B11/30G01N21/86
Inventor S·波塔彭科
Owner CORNING INC
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