Abstract

Industrial lasers are an expanding technology of welding and other materials processing. Lasers with optical scanning heads are often used, as these provide more versatility, accuracy, and speed. The output part of the scanning head is covered by a protective glass, which might get contaminated by various particles from the laser processing. This decreases the transmissivity of the glass, and it can affect the production quality. The contamination needs to be checked regularly, but a visual inspection might not always be effective. This paper proposes two alternative methods of inspecting the protective glass: flash-pulse active thermography, and laser active thermography. They are based on the thermal excitation of the glass and measuring the response with an infrared camera. The experimental setup and practical results are described and the advantages and disadvantages are discussed. The presented methods are proven to be effective in detecting the contamination of the glass.

© 2016 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
Linear laser fast scanning thermography NDT for artificial disbond defects in thermal barrier coatings

Zhanwei Liu, Dacheng Jiao, Wenxiong Shi, and Huimin Xie
Opt. Express 25(25) 31789-31800 (2017)

Lasers and infrared thermography: advantageous cooperation

Boris G. Vainer
Appl. Opt. 55(34) D95-D100 (2016)

Inspection of disbonds in multilayer dissimilar metal structure using lock-in thermography

Zhenggan Zhou, Hanxue Zhao, Guangkai Sun, Pengfei He, Jin Fan, and Gen Li
Appl. Opt. 55(16) 4490-4496 (2016)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Figures (14)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Metrics

You do not have subscription access to this journal. Article level metrics are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription