Photoelectric edge detection system and detection method thereof

A technology of edge detection and detection method, which is applied in the field of photoelectric edge detection system, can solve the problems of easy to be affected by optical power change stability, probe wear material, low sensitivity, etc., to facilitate on-site measurement, high-precision detection, and solve low sensitivity Effect

Active Publication Date: 2020-09-29
ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the technical problems of mechanical contact detection in the existing edge detection method that introduces errors due to probe wear and limited materials, and the photosensitive detection method based on light intensity change detection has low sensitivity and poor stability due to factors such as light power changes, this paper The invention proposes a photoelectric edge detection system and its detection method

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  • Photoelectric edge detection system and detection method thereof
  • Photoelectric edge detection system and detection method thereof
  • Photoelectric edge detection system and detection method thereof

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Embodiment 1

[0042] Embodiment 1: as figure 1 As shown, a photoelectric edge detection system includes a light source 1, the light source 1 cooperates with a diaphragm 3 through a collimator 2, and the diaphragm 3 cooperates with a position-sensitive photodetector 4. The object to be measured is made of low transmittance material. The light source 1, collimator 2, aperture 3 and position sensitive photodetector 4 are located on both sides of the object to be measured. The light overlaps and is arranged perpendicular to the photosensitive surface of the position-sensitive photodetector 4. The position-sensitive photodetector 4 is connected to the signal processing unit. The signal processing unit includes a signal processing circuit and a single-chip microcomputer / host computer. The position-sensitive photodetector outputs The photoelectric current signal is transmitted to the single-chip microcomputer or host computer through the signal processing circuit.

Embodiment 2

[0043] Embodiment 2: as Figure 5 As shown, a photoelectric edge detection system, when the object 5 to be measured is a material with high transmittance, such as glass, or an object whose surface is mirror-reflected such as a liquid crystal screen, the position of the light source 1, the collimator 2 and the diaphragm 3 The sensitive photodetector 4 is located on the same side of the object to be measured. According to the axis of the collimator 2 and the axis of the diaphragm 3 coincide with the light emitted by the light source 1, the light is incident on the surface of the object to be measured, and after reflection, it is vertically incident on the position-sensitive photoelectric detector. Arrangement in the center of the photosensitive surface of the device;

[0044] All the other structures are the same as in Example 1.

Embodiment 3

[0045] Embodiment 3: a kind of photoelectric edge detection method, comprises the following steps:

[0046] S1, the light source 1 emits light, the light source 1, the collimator 2, the diaphragm 3 and the position sensitive photodetector 4 are arranged in sequence along the light, the light emitted by the light source 1 coincides with the axis of the collimator 2 and the axis of the diaphragm 3, Vertical to the photosensitive surface of the position sensitive photodetector 4;

[0047] S2. The light emitted by the light source 1 passes through the collimator 2 to obtain a collimated beam. The collimated beam is shaped by the diaphragm 3. Straight beam cross-section forms a spot of set size and shape;

[0048] When the edge of the object 5 to be measured is a straight line, a rectangular aperture is selected. For edges of other characteristic types such as arcs, the corresponding specific shape aperture 3 can also be selected for beam shaping;

[0049] S3. The shaped collimat...

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Abstract

The invention provides a photoelectric edge detection system and a detection method thereof. The system comprises a light source, which is matched with a diaphragm through a collimator, wherein the diaphragm is matched with a position sensitive photoelectric detector, the light source, the collimator, the diaphragm and the position sensitive photoelectric detector are located on the same side or two sides of a to-be-detected object according to different optical properties of the material of the to-be-detected object, and the position sensitive photoelectric detector is connected with a signalprocessing unit. According to the invention, object edge detection is converted into measurement light beam light spot intensity center position change detection, so that non-contact and high-precision detection of the object edge is achieved, corresponding shaping can be conducted on the measurement light beam through the specific diaphragm according to the edge characteristics of different to-be-detected objects, and the sensitivity and stability of object edge detection are greatly improved; and the system is simple and flexible in overall structure, can be adjusted according to materialswith different optical properties, and facilitates the on-site measurement.

Description

technical field [0001] The invention relates to the technical field of photoelectric detection, in particular to a photoelectric edge detection system and a detection method thereof. Background technique [0002] Object edge detection, also known as edge-finding measurement, is an indispensable link in many precision machining, assembly and dimensional parameter measurement, and is a very important part of the precision detection field. So far, several different object edge detection methods have appeared, such as mechanical contact edge detection system in machining (an automatic edge detection system, patent application number is 2018109972717) and non-contact photosensitive edge detection system, glass Edge-to-edge recognition systems in size inspection (such as Keyence's machine vision system, Cognex's In-Sight system), etc. [0003] The position sensitive detector (PSD) can detect the relative position of the light spot on the photosensitive surface of the detector bas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/24
CPCG01B11/24
Inventor 翟玉生杨鹏张腊梅闫赛赛谢泽铧郭逸航吴树勋张志峰杨坤王新杰
Owner ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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