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Method for judging laser cleaning effect

A laser cleaning and determination method technology, applied in the field of laser cleaning, can solve problems such as difficult to realize online monitoring, low detection speed rate, complex algorithm, etc., and achieve the effects of reducing damage risk, efficient cleaning, and low cost

Active Publication Date: 2017-07-07
SICHUAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Limited by the frame rate and price of the camera, this method has the disadvantages of low detection rate, complex algorithm and high cost
Both of the above methods are difficult to realize online monitoring of laser cleaning under high repetition frequency laser

Method used

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  • Method for judging laser cleaning effect
  • Method for judging laser cleaning effect
  • Method for judging laser cleaning effect

Examples

Experimental program
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Effect test

Embodiment 1

[0028] In this embodiment, the laser 1 adopts a Q-switched Nd:YAG pulsed solid-state laser with a wavelength of 1064 nm, a pulse width of 7 ns, an adjustable frequency of 1-100 Hz, and an energy range of 0-100 mJ, which is focused on the white paint sample through a lens , so that it generates laser plasma; reflector 2 uses a dielectric coated lens with a total reflection of 1064nm wavelength of 45°; lens 3 uses a lens with a focal length of 200mm; the base plate of sample 4 uses an Al substrate, and the paint is protected The white automatic spray paint produced by Li Company is uniformly sprayed on the surface of the substrate with a thickness of about 150 µm; the fiber diameter of the optical fiber probe 5 is 400 µm; the spectral separation part 6 uses the grating spectrometer of the Princeton Instruments company model Acton SP2750; the photoelectric detector 7 adopts THORLABS company model APD430A2( / M) detector, detection range is 200-1000nm, bandwidth is 400MHz; high-speed...

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Abstract

The invention relates to a method for judging a laser cleaning effect according to a time-resolved spectrum. The method includes the steps that a detection wavelength is selected; a laser irradiates the surface of an object to be cleaned, and a plasma spectral line is acquired; a time-resolved spectrum signal of the selected wavelength is acquired; the cleaning effect is judged according to the time-variation characteristic of the acquired signal. According to the method, the cleaning effect is judged according to the time-resolved spectrum, which is a new judgment method. Real-time, fast and accurate judgment of a high repetition frequency laser cleaning effect can be carried out, the method lays a foundation for closed-loop control, the damage risk of a metal substrate is greatly reduced, a purpose of efficiently cleaning is achieved, and the method has the advantages of being high in efficiency and low in cost.

Description

technical field [0001] The invention belongs to the field of laser cleaning, and in particular relates to a method for judging the effect of laser cleaning. Background technique [0002] In recent decades, laser technology has penetrated into many high-tech fields. As a new cleaning method, laser cleaning has begun to replace traditional cleaning techniques. The chemical solvents used in traditional chemical cleaning methods are volatile, which is harmful to the health of operators and easily causes environmental pollution. At the same time, the reaction of chemical reagents is slow, often requires heat treatment, the cleaning efficiency is low, and chemical residues will cause different degrees of corrosion to the substrate. Traditional physical removal methods cause varying degrees of damage to the substrate, which is inconvenient for finishing operations and has low efficiency. Laser cleaning technology uses a high-power-density laser beam to irradiate the surface of th...

Claims

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Application Information

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IPC IPC(8): G01N21/73
CPCG01N21/73
Inventor 冯国英陈林邓国亮薛红艳李嘉琦
Owner SICHUAN UNIV
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