Phase-Locked Image Acquisition In Thermography

P. K. Kuo; T. Ahmed; Huijia Jin; R. L. Thomas

doi:10.1117/12.948970

21 March 1989 Phase-Locked Image Acquisition In Thermography

P. K. Kuo, T. Ahmed, Huijia Jin, R. L. Thomas

Proceedings Volume 1004, Automated Inspection and High-Speed Vision Architectures II; (1989) https://doi.org/10.1117/12.948970
Event: 1988 Cambridge Symposium on Advances in Intelligent Robotics Systems, 1988, Boston, MA, United States

Abstract

Phase-locked detection is a very useful instrumentation technique. It can be used whenever the desired signal is phase-coherent with another reference signal. Very frequently, the reference signal is, or can be derived from, the periodic external stimulus which is responsible for the signal in the first place. Typically the use of a lock-in amplifier can improve the signal-to-noise ratio by several orders of magnitude. We describe a successful implementation of an infrared imaging system in which the images are phase-locked with the periodic thermal radiation used as source of illumination and we also report the application of this phase-locked infrared imaging technique to the detection of microcracks in Cu foils deposited on polyimide substrates.

Citation Download Citation

P. K. Kuo, T. Ahmed, Huijia Jin, and R. L. Thomas "Phase-Locked Image Acquisition In Thermography", Proc. SPIE 1004, Automated Inspection and High-Speed Vision Architectures II, (21 March 1989); https://doi.org/10.1117/12.948970

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