Multi-spectral spectroscopic photography-based visual monitoring system

A monitoring system and multi-spectral technology, applied in arc welding equipment, manufacturing tools, welding equipment, etc., can solve the problems of inability to obtain clear and stable front bevel images, easy introduction of errors, weakened light intensity, etc., to achieve image registration and The effect of subsequent image fusion is convenient, accuracy and stability are guaranteed, and interference is avoided

Inactive Publication Date: 2013-03-20
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Considering the above-mentioned characteristics of arc luminescence, the solution to the visualization problem of the near-arc area in the arc welding process monitoring in the prior art is as follows: (1) Install a narrow-band filter and a light reduction device in front of the camera to filter out the light to the greatest extent. Under the influence of strong arc light, keep the spectral segment of interest (for example: when using laser structured light with a wavelength of 640nm or 660nm for visual tracking of weld seams, select a narrow-band filter with the corresponding central wavelength to allow only light near the central wavelength to pass through, to achieve The purpose of reducing arc interference), but because only a single spectrum image can be obtained, the information is not rich enough to complete the acquisition of multi-feature information; (2) A dual-camera system is used, and one of the cameras shoots the molten pool area through a filter , the light intensity of the molten pool is weakened, and the profile information of the molten pool can be obtained after processing. Another camera directly shoots the front groove without a filter, which is used to observe the groove position under natural light conditions before welding starts. , the disadvantage of this method is that: the two cameras have different fields of view, and there is an image registration problem between the obtained images, which is easy to

Method used

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  • Multi-spectral spectroscopic photography-based visual monitoring system

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Experimental program
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Embodiment 1

[0025] Such as Figure 4 As shown, the present embodiment takes the front groove as the welding workpiece 3 for description, the auxiliary light source 2 includes a ring-shaped LED surface light source 21 with a wavelength of 980nm and a laser line structured light source 22 with a wavelength of 660nm, and the lens 11 of the camera 1 passes directly below The peripheral bracket fixes the annular LED surface light source 21, and one side of the camera 1 fixes the laser line structured light source 22 through the peripheral bracket. This can be adjusted according to the actual situation), the center wavelength of the first narrow-band filter 5 is 980nm, and only light with a wavelength within the range of 980nm±20nm can pass through the first narrow-band filter 5, and the second narrow-band filter The central wavelength of sheet 8 is 653nm, wherein only the light energy within the range of 653nm ± 18nm can pass through the second narrow-band filter 8, the light transmittance of ...

Embodiment 2

[0028] Such as Figure 5 The present embodiment shown is described with the front groove as the welding workpiece 3, and one side of the camera 1 is fixed with an infrared laser illumination source 2 with a wavelength of 1060 nm through an external bracket, and the infrared laser illumination source 2 is used as an auxiliary light source. The normal line is 45° to the optical axis direction of the lens 11 of the camera 1 (not limited to this, it can be adjusted according to the actual situation), the central wavelength of the first narrow-band filter 5 is 1060nm, and only the wavelength is within the range of 1060nm±20nm The light can pass through the first narrow-band filter 5, the center wavelength of the second narrow-band filter 8 is 653nm, wherein only the light with a wavelength in the range of 653nm ± 18nm can pass through the second narrow-band filter 8, the first subtraction The light transmittance of the light sheet 6 is 1%, the light transmittance of the second ligh...

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Abstract

The invention relates to a multi-spectral spectroscopic photography-based visual monitoring system. The multi-spectral spectroscopic photography-based visual monitoring system is characterized by comprising a camera, wherein more than one auxiliary light sources are arranged outside the camera; a semi-transmissive and semi-reflective lens, a first narrow band filter, a first dimming element, a first area array image sensor, a second narrow band filter, a second dimming element and a second area array image sensor are arranged in the camera; light emitted from the auxiliary light source irradiates a welding workpiece; the light rays reflected by the welding workpiece are transmitted to the semi-transmissive and semi-reflective lens through the lens of the camera; the light rays transmitted from the semi-transmissive and semi-reflective lens are transmitted to the first area array image sensor through the first narrow band filter and the first dimming element in turn to complete imaging; and the light rays transmitted from the semi-transmissive and semi-reflective lens are transmitted to the second area array image sensor through the second narrow band filter and the second dimming element in turn to complete imaging. The multi-spectral spectroscopic photography-based visual monitoring system can be widely applied to automatic welding bead recognition processes of groove detection, welding seam tracking, non-destructive testing after welding and the like of a welding robot or other automation equipment.

Description

technical field [0001] The present invention relates to an arc welding process visualization system, in particular to a visual monitoring system based on multi-spectral spectroscopic photography for simultaneous observation of multiple objects such as front grooves, molten pools, welding wires, and arcs. Background technique [0002] The visual monitoring of the arc welding process refers to the observation of the welding area during the real-time welding process. This process is of great significance for controlling and stabilizing the welding quality. The observation objects mainly include: front groove, molten pool, welding wire, welding arc, etc. In the prior art, the use of cameras to shoot the arc welding process for visual monitoring plays an important role in production: 1. When performing welding operations in places that are difficult or unsuitable for people to reach (such as: high altitude, underwater, dangerous environments, etc.), the welding Remote monitoring ...

Claims

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Application Information

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IPC IPC(8): B23K9/095
Inventor 都东邹怡蓉王力曾锦乐
Owner TSINGHUA UNIV
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