Laser coherence detection device for ceramic product surface defect

Abstract

The invention relates to a laser coherence detection device for ceramic surface defect. According to the device, a single-frequency laser outputs the laser by an optical fiber coupler, a loop device, and a receiving and transmitting telescope to detect the ceramic product surface; the detection echo passes through the loop device, a polarizing beam splitter and the optical fiber coupler, and is subjected to frequency mixing coherence with the intrinsic light on the surface of a detector; the coherent signal is amplified and sampled by filtering, and the structure size of the ceramic product surface defect is calculated by extracting the superposition modulation signal amplitude of the continuous echo Doppler frequency shift signals.

Description

Technical field [0001] The invention relates to a device for detecting surface defects of ceramic products, in particular to a device for detecting surface defects of ceramic products based on a laser coherent method. Background technique [0002] In the production process of ceramic products, surface defects such as cracks and pores will occur. These defects directly affect the quality of ceramic products. Rapid defect detection must be achieved through technical means, and then product quality can be effectively controlled. [0003] For the detection of surface defects of ceramic products, the traditional method is to use manual detection methods to judge the location, quantity and degree of defects through direct observation and auxiliary equipment (such as magnifying glass) observation. This method has disadvantages such as low efficiency and high requirements for technical personnel. In terms of automatic detection of surface defects of ceramic products, ultrasonic tes...

AI Technical Summary

Problems solved by technology

Its main disadvantage is that although conventional low-frequency ultrasonic systems or conventional x-ray systems can detect the structure of the surface of ceramic products, the general resolution is not high

Micro-focus x-ray method, which can detect cracks as small as 10μm, but the orientation of the crack should be consistent with the direction of the x-ray beam, which is less adaptable to various forms of surface defects

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