High-precision real-time three-dimensional measurement system and method for measuring micro defects on surface of aviation component

Abstract

The invention provides a high-precision real-time three-dimensional measurement system and method for measuring micro defects on the surface of an aviation component. The system comprises a light source system, a polarized light modulation subsystem, a to-be-measured target, a detection and acquisition system and a computer processing system which are sequentially arranged along a light path; the polarized light modulation subsystem comprises a light beam collimation assembly and a polarization state modulation assembly which are sequentially arranged along the light path. Modulation of two beams of circularly polarized light with opposite rotation directions is realized by adopting the polarization grating, and the system is simple, compact and convenient to integrate and carry; according to the invention, a focal plane type polarization detector is adopted, four polarization images can be obtained at the same time, images under four phase shifts can be obtained through single exposure, and the three-dimensional shape of the surface defect of a to-be-detected part is solved in real time; by means of the polarized light imaging, light beam stability is good, accuracy is high, strong reflection flare light on the surface of a component can be effectively eliminated, and the imaging effect is better.

Description

technical field [0001] The invention belongs to the field of non-destructive testing in the aviation industry, and relates to a system and method for high-precision and real-time measurement of the three-dimensional appearance of micro-defects on the surface of aviation components. Background technique [0002] During the long-term working process, the aircraft is affected by various factors such as airflow erosion, high-temperature oxidation, and mechanical wear, and it is easy to produce micro-defects on the surface, such as surface scratches, cracks, oxidation corrosion of various coatings, and surface peeling off. , These early micro-defects are easy to expand under the action of high temperature and high pressure, high-speed airflow erosion, and heavy load, forming irreparable macro cracks and defects, causing component failure and scrapping, and seriously affecting flight safety. [0003] At present, the detection of surface defects of most components on the front line...

AI Technical Summary

Problems solved by technology

[0006] In order to solve the shortcomings of the existing dynamic polarization phase-shifting interferometry technology system, which has a large number of components, a complex system, and poor integration and portability for aerospace parts detection, the present invention provides a high-precision real-time three-dimensional Measurement system and method

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