Optical probe for porosity defect detection on inner diameter surfaces of machined bores

Ojas P. Kulkarni; Mohammed N. Islam; Fred L. Terry Jr.

doi:10.1117/1.3526336

1 December 2010 Optical probe for porosity defect detection on inner diameter surfaces of machined bores

Ojas P. Kulkarni, Mohammed N. Islam, Fred L. Terry Jr.

Author Affiliations +

Optical Engineering, Vol. 49, Issue 12, 123606 (December 2010). https://doi.org/10.1117/1.3526336

Abstract

We demonstrate an optical probe for detection of porosity inside spool bores of a transmission valve body with diameters down to 5 mm. The probe consists of a graded-index relay rod that focuses a laser beam spot onto the inner surface of the bore. Detectors, placed in the specular and grazing directions with respect to the incident beam, measure the change in scattered intensity when a surface defect is encountered. Based on the scattering signatures in the two directions, the system can also validate the depth of the defect and distinguish porosity from bump-type defects coming out of the metal surface. The system can detect porosity down to a 50-µm lateral dimension and ~40 µm in depth with >3-dB contrast over the background intensity fluctuations. Porosity detection systems currently use manual inspection techniques on the plant floor, and the demonstrated probe provides a noncontact technique that can help automotive manufacturers meet high-quality standards during production.

©(2010) Society of Photo-Optical Instrumentation Engineers (SPIE)

Citation Download Citation

Ojas P. Kulkarni, Mohammed N. Islam, and Fred L. Terry Jr. "Optical probe for porosity defect detection on inner diameter surfaces of machined bores," Optical Engineering 49(12), 123606 (1 December 2010). https://doi.org/10.1117/1.3526336

Published: 1 December 2010

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