Optical Inspection System for the Inner Surface of a Pipe

Author

Liefeng, Zhao ; Huajun, Feng ; Qi, Li ; Tingfeng, Ye

Author_Institution

Zhejiang Univ., Hangzhou

fYear

2007

Abstract

The inspection for the inner wall is necessary during the life of a pipe from the production to the condemnation. A corresponding optical inspection system has been developed. This system uses the motion of a complicated mechanism in the axial direction droved by a stepper motor, and the detection of panoramic images from the illuminated circumferential inner surface realized by a hemispherical panoramic imaging system (HPIS). Irregularities of images due to corrosion or accumulation of brass deposits on the inner surface are inspected by this system. The experimental system reported in this article has the following specifications: resolution of detection of 0.3 mm at the circumference direction and 1.1 mm at the axial direction of a pipe, and inspection speed of 15 mm/s at an interval of 0.5 mm.

Keywords

CCD image sensors; automatic optical inspection; charge-coupled devices; pipes; complex mechanism; hemispherical panoramic imaging system; image sensor; inner wall inspection; optical inspection system; panoramic images detection; pipe inner surface; stepper motor drive; Charge coupled devices; Inspection; Instruments; Laboratories; Light emitting diodes; Lighting; Motion detection; Optical imaging; Optical sensors; Production systems; Hemispherical panoramic imaging system; Image sensor; Inner wall; Inspection; LED ring; Pipe;

fLanguage

English

Publisher

ieee

Conference_Titel

Electronic Measurement and Instruments, 2007. ICEMI '07. 8th International Conference on

Conference_Location

Xi´an

Print_ISBN

978-1-4244-1136-8

Electronic_ISBN

978-1-4244-1136-8

Type

conf

DOI

10.1109/ICEMI.2007.4350517

Filename

4350517