LBT 8.4m Casting Images

January 1997

by: Anna Rosa Lampis and Yuliya Shlemenzon

Pre-melting view
from Camera A

Mid-melting view
from Camera A

Post-melting view
from Camera A

Pre-melting view
from Camera B

Mid-melting view
from Camera B

Post-melting view
from Camera B

Pre-melting view
from Camera C

Mid-melting view
from Camera C

Post-melting view
from Camera C
All of these images are flash pictures with a 1/4000 sec exposure on a CCD video camera taken through a 3 mm pinhole in the wall of the rotating furnace. A blue filter (CM500) is used to suppress the red/infrared light from the hot glass. Dates and times are reported at the bottom of the frame.
The pre-melting image was taken at about 640 ° C while heating up.The mid-melting image was taken at 900 ° C while heating up. The post-melting image was taken while mirror was cooling
(about 1000 °C)

Real data from the control room!

Furnace temperature vs Time
(graph by: Valerie Jones)

Digital camera view inside the furnace

Wide angle view inside the furnace

Placing the glass
over the mold
(photo by: Lori Stiles)

Placing the glass
over the mold: close-up
(photo by: John Florence)

Closing the furnace

(photo by: John Florence)

8.4m LBT mirror
after casting
(photo by: John Hill)

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