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Optical detecting method for internal surface of hole

A technology for the inner surface of a hole and optical detection, which is applied in the direction of material analysis, measuring devices, scientific instruments, etc. through optical means, to achieve the effect of large-scale rapid detection, fast detection speed, and small conditional restrictions

Inactive Publication Date: 2012-05-02
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the technical problems existing in the existing detection methods, the present invention provides a rapid and automatic detection method for the inner surface of the hole, and realizes accurate detection of the inner surface of the hole in a range of 360 degrees by adopting optical technology means

Method used

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  • Optical detecting method for internal surface of hole
  • Optical detecting method for internal surface of hole
  • Optical detecting method for internal surface of hole

Examples

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Embodiment

[0050] Following the steps described above, the figure 1 The optical sensor shown detects the inner surface of a hole. In order to verify the effectiveness of the algorithm, a special pattern is pasted on the inner surface of the hole. The servo motor drives the sensor to move at a constant speed along the axis of the hole. The computer gives a trigger signal to control the sensor to sample evenly. , first perform image back-projection transformation according to equations (1)-(3) to obtain a 360-degree expanded image of the inner surface, Figure 4 The upper middle picture is the original image of the inner surface of the hole sampled by the optical sensor. The annular area between the two circles C1 and C2 in the picture is the effective area of ​​image processing. The center and radius of the two circles are set during the operation. Figure 4 The middle and lower images are the expanded image of the inner surface of the hole obtained after reprojection of the effective are...

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Abstract

The invention provides a method for detecting the inner surface of a hole by an optic way, which comprises the following procedures: a. an illumination light is placed in the hole and made to illuminate the perimeter in the hole; b. an imaging device arranged along the axial line of the hole is used to pick up the light from the illumination light source and reflected by the inner wall of the hole; c. the illumination light and the imaging device are moved synchronously along the axial line of the hole; and the signals got by the imaging device are processed to get the explored image of the inner surface of the hole. The invention can achieve accurate detection on the inner surfaces of holes, and is of less limiting conditions, is of high inspection speed and wide inspection range, high detection accuracy, and the detection results are easy to be graphed and expressed in an outstanding way.

Description

technical field [0001] The invention relates to a detection method for the inner surface of a hole, in particular to an optical detection method for the inner surface of a hole which is detected by means of optics and image processing. Background technique [0002] Holes refer to pipes for transporting natural gas, heat exchanger pipes, and hydraulic cylinders. Such parts are widely used in production, life, and military fields. The processing state of the inner surface and defects such as wear, scratches, and shedding are used to judge whether it is qualified and eliminate potential safety hazards, analyze the life characteristics of hole parts, and provide a scientific basis for the research and processing of hole parts. [0003] Traditional hole surface inspection techniques include eddy current flaw detection, magnetic particle flaw detection and ultrasonic flaw detection. Eddy current flaw detection is easily affected by external conditions. Magnetic particle flaw detec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/954
Inventor 徐春广肖定国冯忠伟朱文娟郝娟周世圆
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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