Application of endoscopic ESPI in NDI

Erwin K. Hack

doi:10.1117/12.439200

11 September 2001 Application of endoscopic ESPI in NDI

Erwin K. Hack

Proceedings Volume 4420, Laser Metrology for Precision Measurement and Inspection in Industry; (2001) https://doi.org/10.1117/12.439200
Event: Laser Metrology for Precision Management and Inspection in Industry, 2001, Florianopolis, Brazil

Abstract

Electronic Speckle Pattern Correlation Interferometry (ESPI) is used as a tool for NDI, in many aspects complementary to x-ray or ultrasonic techniques. Many technical structures are to be inspected from the inside but are not accessible to conventional ESPI. Endoscopes as known from visual inspections lend themselves to circumvent this limitation. The endoscope is used as an 'extended lens' to transfer the object wave to the interferometer. We us the ring shaped illuminating fiber bundle of a rigid endoscope for beam delivery. For observation and object wave transfer the relay optics of the endoscopes is used which results in a very good image quality. In laboratory environment stability and beam quality of this set-up is adequate for NDI-applications in spite of the multi-mode multi-fiber character of the illuminating fiber bundle, since the bundle is mechanically rigid.

Citation Download Citation

Erwin K. Hack "Application of endoscopic ESPI in NDI", Proc. SPIE 4420, Laser Metrology for Precision Measurement and Inspection in Industry, (11 September 2001); https://doi.org/10.1117/12.439200

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