A brilliant hack - Dragonfly

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Instead of going for larger and larger telescope mirrors, how about taking some off-the-shelf telephoto lenses and combing them into an array.

From the University of Toronto:

Dragonfly
Dragonfly is an innovative, multi-lens array designed for ultra-low surface brightness astronomy at visible wavelengths. Commissioned in 2013 with only three lenses, the array is growing in size and proving capable of detecting extremely faint, complex structure around galaxies.

According to Cold Dark Matter (CDM) cosmology, structure in the Universe grows from the “bottom up”, with small galaxies merging to form larger ones. Evidence of such mergers can be seen in faint streams and filaments visible around the Milky Way Galaxy and the nearby M31 galaxy.

But the CDM model predicts that we should see more of this structure than is currently observed. However, images obtained using even the largest, most advanced telescopes today contain scattered light that may be hiding this faint structure.

Dragonfly is designed to reveal the faint structure by greatly reducing scattered light and internal reflections within its optics. It achieves this using ten, commercially available Canon 400mm lenses with unprecedented nano-fabricated coatings with sub-wavelength structure on optical glasses.

Also, Dragonfly images a galaxy through multiple lenses simultaneously—akin to a dragonfly’s compound eye—enabling further removal of unwanted light. The result is an image in which extremely faint galaxy structure is visible.

The array began imaging targets in 2013 from its home at the New Mexico Skies hosting facility. Images have shown Dragonfly is at least ten times more efficient than its nearest rival and will be able to detect faint structures predicted by current merger models.

Here is a photo in its current configuration:

20150527-df01.jpg

 

There is a nice paper describing the hardware, software and performance of the scope here: Ultra Low Surface Brightness Imaging with the Dragonfly Telephoto Array

Very clever hack as all the hardware and software costs about $135K - much less than an equivalent quality scope of the same capabilities.

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This page contains a single entry by DaveH published on May 27, 2015 10:28 AM.

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