Panoramic optical annular staring inspection system for evaluating the inner surface of a pipe

Liefeng Zhao; Huajun Feng; Jian Bai; Hao Jin

doi:10.1117/12.755838

8 January 2008 Panoramic optical annular staring inspection system for evaluating the inner surface of a pipe

Liefeng Zhao, Huajun Feng, Jian Bai, Hao Jin

Proceedings Volume 6838, Optoelectronic Devices and Integration II; 68381P (2008) https://doi.org/10.1117/12.755838
Event: Photonics Asia 2007, 2007, Beijing, China

Abstract

There should be flaws and defects on the inner surface during the producing period of a pipe, as well as contaminations and corrosions during the using period of it. A corresponding panoramic optical annular staring inspection system has been developed. It requires no rotating mechanism to exam the whole circumference of a cross section of the inner pipe surface at once, which results high speed inspection. There are two main subsystems in this inspection system, the panoramic optical annular staring imaging subsystem and driving robot subsystem. The Flat Cylinder Perspective (FCP) is the principle to image a panoramic annular view to a flat imagery, i.e. a cylinder of vision imaged is flat. Our imaging subsystem includes a panoramic annular lens (PAL), which is critical and used to implement the FCP, a series of image rotation lenses, a charge-coupled device (CCD) camera, and an illuminating light-emitting diode (LED) ring. The CCD camera sending the signal to a personal computer (PC) via VGA signal results a real time inspection. The driving robot subsystem is a fine designed complicated mechanism including a subassembly of stepper motor. It can drive the inspection system forward and backward continuously in the pipe along the axial direction. The experimental system reported in this paper has the following specifications: average detection resolution of 0.5 mm at the circumference direction and 1.0 mm at the axial direction of a pipe, and inspection speed of 15 mm/s.

Citation Download Citation

Liefeng Zhao, Huajun Feng, Jian Bai, and Hao Jin "Panoramic optical annular staring inspection system for evaluating the inner surface of a pipe", Proc. SPIE 6838, Optoelectronic Devices and Integration II, 68381P (8 January 2008); https://doi.org/10.1117/12.755838

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available