Application of auto-focus technique in accurate 3D detection of aircraft surface

Lei Liu; Xusheng Zhu; Daixin Chen; Li Zhou; Qi Qin

doi:10.1117/12.2666506

4 April 2023 Application of auto-focus technique in accurate 3D detection of aircraft surface

Lei Liu, Xusheng Zhu, Daixin Chen, Li Zhou, Qi Qin

Proceedings Volume 12617, Ninth Symposium on Novel Photoelectronic Detection Technology and Applications; 126175F (2023) https://doi.org/10.1117/12.2666506
Event: 9th Symposium on Novel Photoelectronic Detection Technology and Applications (NDTA 2022), 2022, Hefei, China

Abstract

With the characteristics of high stealth and supersonic, the new generation fighter aircraft has become the backbone of national defense. The geometric shape of the aircraft surface directly determines its key indicators. As a result, the accurate three-dimensional detection of the aircraft surface has become a key part of the aircraft manufacturing industry. In this paper, a 3D detection method of aircraft surface based on auto-focus technique is proposed, which can achieve the measurement effect of "what can be seen is what can be detected". The measurement system is mainly composed of an optical system with a small depth of view and a longitudinal scanning mechanism with a high moving precision, which can realize fast, comprehensive and reliable three-dimensional shape detection. In the process of longitudinal scanning, the needed images are captured by the camera which is carried by the scanning mechanism. Further, combined with the auto-focus technique, the three-dimensional point cloud of the entire imaging plane can be obtained. This method is a non-contact optical measurement method, which has a simple measurement system in structure and does not need to actively project any form of structured light. In summary, the proposed method has the characteristics of non-damage, high efficiency and low cost. At the same time, the proposed method has good robustness for the surfaces to be measured with different materials, shapes and sizes on the aircraft surface, which is especially suitable for the acquisition of three-dimensional point clouds in the surface area with complex texture and large roughness.

Citation Download Citation

Lei Liu, Xusheng Zhu, Daixin Chen, Li Zhou, and Qi Qin "Application of auto-focus technique in accurate 3D detection of aircraft surface", Proc. SPIE 12617, Ninth Symposium on Novel Photoelectronic Detection Technology and Applications, 126175F (4 April 2023); https://doi.org/10.1117/12.2666506

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KEYWORDS

Cameras

Point clouds

3D metrology

3D acquisition

Manufacturing

Image processing

Optical testing

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