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Reflected light shield eliminating method for surface measurement of laser displacement sensor

A technology of laser displacement and light reflection, which is applied to lasers, laser components, measuring devices, etc., can solve problems such as large errors and complex motion algorithms, and achieve the effects of simple operation, low algorithm complexity, and elimination of dead zone problems in measurement

Inactive Publication Date: 2004-12-15
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

In some special cases, the measurement path must be changed, resulting in complex motion algorithms
In addition, it also involves the problem of multi-view stitching algorithm, so the error is large

Method used

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  • Reflected light shield eliminating method for surface measurement of laser displacement sensor
  • Reflected light shield eliminating method for surface measurement of laser displacement sensor
  • Reflected light shield eliminating method for surface measurement of laser displacement sensor

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Embodiment Construction

[0023] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0024] The operation process of the inventive method is as figure 1 As shown, including the process before the measurement process and the process during the measurement process. Before the measurement process, three standard planes are measured first to obtain the position deviation value of the laser displacement sensor before and after the rotation around the Z axis. The measurement process is carried out according to the planned measurement path. If there is no occlusion, increase the incremental value of the probe along the measurement feed direction to measure the next path. If the phenomenon of reflected light shading occurs during the measurement of a certain path, rotate the laser displacement sensor 180 degrees around the Z axis at the end of the path, and correct the position of the light spot so that it is consist...

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Abstract

The present invention is reflected light shield eliminating method for surface measurement of laser displacement sensor. The standard planes are measured in advance to obtain the deviation of the laser displacement sensor before and after rotation around Z-axis. The measurement is performed in specified routes. In the case of no shield, the route number is incremented for the measurement of the next route. When reflected light shield exists, the laser displacement sensor will be turned for 180 deg in the route end and the light point position will be corrected to perform the measurement of the said route. By turning the laser displacement sensor to make the reflected light move away from the shielded workpiece, the present invention can eliminate measurement dead zone in some range.

Description

Technical field: [0001] The invention relates to a method for eliminating the shielding of reflected light in surface measurement of a laser displacement sensor, relates to three-dimensional measurement and three-dimensional modeling, is used for digitizing the surface contour of a three-dimensional object, and belongs to the field of mechanical design and manufacturing. Background technique: [0002] As a high-speed non-contact measuring head, the laser displacement sensor has been widely used in reverse engineering and surface detection of parts. Compared with contact measuring devices, it has no interference to the measured surface and will not scratch the surface of the workpiece during the measurement process; It can directly measure the surface of very low hardness, high elasticity or soft objects (even liquids); there is no three-dimensional compensation problem of the probe radius and other advantages. However, due to the limitations of the working principle and stru...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/03H01S3/00
Inventor 王宇晗李晔
Owner SHANGHAI JIAOTONG UNIV