Method for correcting influence of thermal current on related measuring precision of digital image

A related measurement and digital image technology, applied in the field of optical measurement, can solve problems such as the distortion degree of the strain map of difficult thermal airflow, and achieve the effects of good chemical and thermal stability, reducing the influence of system imaging, and small thermal expansion coefficient.

Active Publication Date: 2018-12-07
SOUTHEAST UNIV
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Problems solved by technology

However, these evaluation mechanisms have their own limitations, because the various elements in the thermal environment are mutually restricted and influenced by each other, and it is diff

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  • Method for correcting influence of thermal current on related measuring precision of digital image
  • Method for correcting influence of thermal current on related measuring precision of digital image
  • Method for correcting influence of thermal current on related measuring precision of digital image

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[0027] The description will be further described below in conjunction with the embodiments and the drawings of the description.

[0028] Set up a binocular stereo vision system, fix two industrial cameras on the optical anti-vibration platform, determine the field of view and spacing of the cameras according to the distance between the optical marking points to be measured, and make the angle between the two cameras around 30°, Quartz glass with circular coding dots is placed on the surface of the specimen sprayed with speckles. After the heater temperature reaches a stable level, the test measurement is performed.

[0029] The method of the present invention for correcting the influence of hot air flow on the accuracy of digital image correlation measurement includes the following steps:

[0030] 1) Arrange the test equipment required by the 3D-DIC method: After spraying a uniform matte white primer on the surface of the test piece and drying it, spray evenly matte black speckles on...

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Abstract

The invention discloses a method for correcting influence of thermal current on the related measuring precision of a digital image. A circular identification point array before and after that influence of thermal current is stabilized is identified, a 3D-DIC algorithm is used to solve displacement of a test piece sprayed with speckled along directions x, y and z, a parameter matrix in which the influence of thermal current causes a virtual displacement field of circular identification points is used to correct the displacement along the directions x, y and z, and thus, a more accurate surfacedisplacement field of the tested piece under influence of the thermal current is obtained. According to the method, a measuring device is simple, realization is easy, use is convenient and effective,the relative cost is lower, the influence of the thermal current on system imaging is reduced effectively, and the influence of thermal current on related measurement precision of the digital image can be corrected effectively.

Description

technical field [0001] The invention belongs to the field of optical measurement, and relates to a method for correcting strain caused by hot air flow by using digital image processing technology and camera calibration technology. Background technique [0002] With the continuous development of optical equipment and image processing technology, optical measurement technology is widely used in industrial measurement, geodetic mapping and other fields. Using optical methods to measure high-temperature deformation is a topic worthy of further research in the development and application of experimental mechanics. Materials used in high-temperature environments, such as structural materials for high-speed aerospace vehicles and high-temperature-resistant alloys in aero-engines, are all Field high-temperature deformation measurements are especially important for determining the thermophysical and mechanical properties of these materials used in high-temperature environments. Ther...

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Application Information

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IPC IPC(8): G01B11/16G01B11/02
CPCG01B11/02G01B11/16G01B21/045
Inventor 何小元李倩苏志龙董帅
Owner SOUTHEAST UNIV
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