Double-light-source yarn flaw detection method

Abstract

A double light source detection method for yarn defect detection, the detection system for realizing the detection method includes a first light source detection unit and a second light source detection unit, the light colors of the first light source and the second light source are different, and the first light source detection The detection optical axes of the unit and the second light source detection unit are perpendicular to the moving direction of the yarn to be detected, while the detection optical axes of the first light source detection unit and the second light source detection unit are orthogonal; the double light source detection method includes the following steps: 1) Calculate Output voltage U of the first light source detection unit R and the second light source detection unit output voltage U G , the standard diameter set by the detection yarn is d 0 , calculate the standard voltage U0 in yarn detection; 2) Calculate the voltage output △ U of the diameter change in the horizontal direction of the yarn R and the voltage output △U of the diameter change in the vertical direction of the yarn G ;3) by ΔU R and ΔU G Determine the type of defect. The invention has low cost, simple system, and can simultaneously detect yarn thickness defects and flat defects.

Description

technical field

[0001] The invention relates to the field of photoelectric detection of yarn quality, in particular to a detection method for yarn defect detection using a double light source mode. Background technique

[0002] Since the reform and opening up, my country's textile industry has developed rapidly, and the overall scale and output value have been greatly improved. At present, the output value of my country's textile industry has accounted for a quarter of the world's. In the textile industry, yarn defect detection has a major impact on the production quality of textiles. At present, automatic detection of yarn defects is playing an increasingly important role in production.

[0003] At present, there are many technical solutions for photoelectric detection of yarn defects. For example, Zhao Xiaodong et al. used capacitive probes to detect yarn thickness and flat defects in "Design of Capacitive Electronic Yarn Clearing System"; Jia Konghao et al. used COMS sen...

Examples

example

[0050] Example: In the yarn defect photoelectric detection system, the LED light signal passes through the beam expander lens and the collimator lens in turn to irradiate the yarn vertically, and then the light signal passes through the focusing lens and the green light filter once and then focuses on the photoelectric conversion module. The same wavelength of 555nm is used for the light source and the optical filter, and the total amount of light intensity absorbed by the photoelectric conversion part of the red light and the green light is 0.01lx when there is no yarn; the photoelectric conversion coefficient of the system h=2v / lx; The λ shading ratio coefficient is 1; the illumination width y is 2cm; therefore the K=100v / m; the standard diameter d 0 =0.5cm; said yarn horizontal direction diameter d 1 =0.7cm, vertical diameter d 2 =0.3cm; the voltage U obtained by the red photoelectric conversion system R =hE 0 -Kd 1 =0.013V, the voltage U obtained by the green photoelec...

technical field

[0001] The invention relates to the field of photoelectric detection of yarn quality, in particular to a detection method for yarn defect detection using a double light source mode. Background technique

[0002] Since the reform and opening up, my country's textile industry has developed rapidly, and the overall scale and output value have been greatly improved. At present, the output value of my country's textile industry has accounted for a quarter of the world's. In the textile industry, yarn defect detection has a major impact on the production quality of textiles. At present, automatic detection of yarn defects is playing an increasingly important role in production.

[0003] At present, there are many technical solutions for photoelectric detection of yarn defects. For example, Zhao Xiaodong et al. used capacitive probes to detect yarn thickness and flat defects in "Design of Capacitive Electronic Yarn Clearing System"; Jia Konghao et al. used COMS sen...

Examples

example

[0050] Example: In the yarn defect photoelectric detection system, the LED light signal passes through the beam expander lens and the collimator lens in turn to irradiate the yarn vertically, and then the light signal passes through the focusing lens and the green light filter once and then focuses on the photoelectric conversion module. The same wavelength of 555nm is used for the light source and the optical filter, and the total amount of light intensity absorbed by the photoelectric conversion part of the red light and the green light is 0.01lx when there is no yarn; the photoelectric conversion coefficient of the system h=2v / lx; The λ shading ratio coefficient is 1; the illumination width y is 2cm; therefore the K=100v / m; the standard diameter d 0 =0.5cm; said yarn horizontal direction diameter d 1 =0.7cm, vertical diameter d 2 =0.3cm; the voltage U obtained by the red photoelectric conversion system R =hE 0 -Kd 1 =0.013V, the voltage U obtained by the green photoelec...

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