Tyre touchdown shape measuring device using laser disperse spot shearing interference method

A technology of laser speckle and measuring device, applied in measuring device, optical device, tire installation, etc., can solve problems such as large embossing error and inability to quantify pressure distribution.

Inactive Publication Date: 2007-02-21
HANKOOK TIRE WORLDWIDE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, there will be considerable error in viewing embossing through natural light
[0006] Moreover, the existing m

Method used

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  • Tyre touchdown shape measuring device using laser disperse spot shearing interference method
  • Tyre touchdown shape measuring device using laser disperse spot shearing interference method
  • Tyre touchdown shape measuring device using laser disperse spot shearing interference method

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Embodiment Construction

[0015] First, technologies in the technical field related to the present invention will be described.

[0016] In general, when a rough surface is irradiated with light with good coherence such as laser light, speckle, which is an unintentional change in brightness distribution, can be observed. This phenomenon is called the speckle effect, and it can be seen sufficiently even with the naked eye. In addition, the speckle effect can be observed regardless of the position of the recording surface or the presence or absence of a lens.

[0017] As mentioned above, speckle contains information such as roughness, deformation, and displacement of the object surface. A speckle pattern interferometer (SPI: Speckle Pattern Interferometer) is an optical interferometer that uses a speckle pattern with the above information as a material to observe the state of an object to be measured.

[0018] Electronic Speckle Pattern Interferometry (ESPI: Electronic Speckle Pattern Interferometry) i...

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PUM

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Abstract

The present invention relates to a device using laser disperse spot shearing interference method to measure the tread deformation and the touchdown pressure in the tire touchdown plane. The measuring device of the present invention is configured in such a way: after the tire and the knurl are fixed on the acrylic panel irradiated by laser, the coherent beams of laser or the like are irradiated thereon; the phase diagram of the light irradiating to the tire surface is obtained; thus the differential value of the object surface dislocation corresponding the physical quantity is obtained quantificationally. The present invention adopts the universe descriptive laser disperse spot shearing interference method which obtains the deformation distribution by nondestructive checking method, and adopts a structural characteristics of using the common light path.

Description

technical field [0001] The invention relates to a measuring device for tire contact shape, in particular to a device for measuring the deformation and contact pressure of the tread in the tire contact surface by using laser speckle shearing interferometry. Background technique [0002] Generally, the principle that light transmitted from the outside is diffused on the embossed surface compressed by the contact pressure of the tire is used, and stress and deformation are qualitatively and quantitatively measured based on the reflectance and intensity of the reflected light. [0003] That is, the footprint can be measured using the amount of deformation of the embossed surface and the reflectance of light when the tire is loaded. [0004] However, the above-mentioned existing measurement methods are limited to the measurement of ground contact pressure when the load changes. That is, if the variation of the embossed surface exceeds a certain value, the linear relationship of ...

Claims

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Application Information

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IPC IPC(8): G01B11/16G01B9/02G01L1/24G01M17/02
CPCB60C25/002G01M17/02G02B27/48
Inventor 李元赫
Owner HANKOOK TIRE WORLDWIDE
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