Paint skip detector

Michael J. Haugh; David P. Stone; Mohan Thangavelu

doi:10.1117/12.21934

1 March 1990 Paint skip detector

Michael J. Haugh, David P. Stone, Mohan Thangavelu

Proceedings Volume 1313, Thermosense XII: An International Conference on Thermal Sensing and Imaging Diagnostic Applications; (1990) https://doi.org/10.1117/12.21934
Event: 1990 Technical Symposium on Optics, Electro-Optics, and Sensors, 1990, Orlando, FL, United States

Abstract

A method to automatically detect areas on coated aluminum sheet that were left uncoated due to a process malfunction has been developed. Detection sensitivity approaches a 1/4-inch diameter bare spot on the aluminum sheet moving up to 1,000 ft/mm The coated aluminum sheet exits a curing oven at temperatures near 410°F. At this point in the process, any bare spots on the aluminum sheet have an approximate emissivity of 0.10. The coating increases the emissivity by 0.15 to 0.75 depending on type and thickness. Since the bare sheet has a lower emissivity, a coating skip will produce a sudden drop in radiated energy (apparent temperature) . The magnitude of the drop depends upon the coating skip size, the coating thickness, the sensor spot size and the sensor response speed. A scanning thermal sensor and signal processor collects line scan information. A baseline following threshold is used to detect anomalous incidents. These incidents are tracked from scan to scan in order to define a complete defect. Paint skip size, severity and location (both downweb and crossweb) can be reported.

Citation Download Citation

Michael J. Haugh, David P. Stone, and Mohan Thangavelu "Paint skip detector", Proc. SPIE 1313, Thermosense XII: An International Conference on Thermal Sensing and Imaging Diagnostic Applications, (1 March 1990); https://doi.org/10.1117/12.21934

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