The World's Largest Liquid-Mirror Telescope Comes Online universetoday storybywill
. Located at UBC’s Malcolm Knapp Research Forest east of Vancouver, B.C., the LZT was the largest liquid-metal mirror before the ILMT was commissioned. Because of their expertise, Dr. Hickson and his colleagues played a pivotal role in designing and creating the ILMT air system. The facility gathered its first light this past May and will temporarily cease operations in October due to India’s monsoon season.
While it may sound like something out of science fiction, the basics of this technology are quite simple. The technology comes down to three components, including a dish containing a reflecting liquid , a rotating section the Liquid Mirror sits atop , and a drive system. When powered up, the LM takes advantage of the fact that the rotational force causes the mirror to take on a parabolic shape, which is ideal for focusing light.
Liquid mercury provides a low-cost alternative to glass mirrors, which are very heavy and expensive to produce. The reflected light passes through a sophisticated multi-lens optical corrector while a large-format electronic camera at the focus records the images. As Dr. Hockson explained in a UBC Science“Rotating once every eight seconds, the mirror floats on a film of compressed air about 10 microns thick. By way of comparison, a human hair is approximately 70 microns thick.
“The camera has a corrector lens that was specially designed to remove star trail curvature. Stars go in circles around the north celestial pole, around the North Star. If you take a time exposure, the stars don’t go in straight lines, they go in arcs or circles. But this corrector is designed to correct for that to remove the curvature to straighten out the star trails, giving us sharp images.”Regular science operations are scheduled to begin later this year.
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