SYMPOSIA PAPER Published: 01 January 1988

Large Scale Damage Testing in a Production Environment


We are using laser damage test systems on a production scale to scan large castings of laser glass for the presence of damage-causing platinum inclusions. These systems support glass melting production lines at two plants; one is in the U.S. (Schott Glass Technologies, Inc.) and the other is in Japan (Hoya Corporation).

The damage test systems are designed to scan an entire glass casting using the pulsed output from a commercial Nd:YAG laser. The system is fully automated and operates unattended. Following testing, the glass casting is removed from the system and visually inspected for the presence of Pt-damage sites. We routinely test polygonally-shaped castings that are about 0.5 meter in size, weigh approximately 30 kg and contain about 7 liters of glass. It takes roughly 6 to 8 hours to test a piece of this size. To date the systems have been in use about 12 hours-per-day, up to 5 days-a-week for a period of about 15 months. Of the approximately 300 disks that have passed the damage test so far, sixty-two percent of the disks have no platinum inclusions at all and ninety-two percent have an inclusion density of less than 0.2 per liter.

Author Information

Weinzapfel, CL
Greiner, GJ
Walmer, CD
Kimmons, JF
Wallerstein, EP
Marchi, FT
Campbell, JH
Hayden, JS
Komiya, K
Kitayama, T
Price: $25.00
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Developed by Committee: F01
Pages: 112–122
DOI: 10.1520/STP24409S
ISBN-EB: 978-0-8031-5033-1
ISBN-13: 978-0-8031-4481-1