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All About Telescopes
Can an image be formed from an array of light sensors without using a lens?
If you have a large number of light-sensing devices (CCD sensors, for example) arranged uniformly in a grid or other array, can you combine their outputs to give an image like what a regular camera could?
I wondered about it after seeing how banks of radio telescopes all function as a cohesive whole.
Theoretically yes, as a phased array. However doing this for true camera-like operation would be difficult.
A contact image sensor (CIS) type scanner uses a linear array of light sensors that are in direct contact with the image surface (ref.). However a camera would need a pinhole or a lens to produce a planar image that can be scanned similarly (i.e., at the focal plane).
Radio telescopes have the advantage of working in a longer-wavelength part of the spectrum. Distances between them can be controlled within fractions of a wavelength so phase-based directionality is possible. Lensless phased-array camera-like devices might become a possibility, but it would require very accurate control to produce them to the required tolerances.
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Superman Volume 2 - 4 Fully Animated Color Cartoons
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Description$ Superman Classic Cartoons in color : |
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Stars, Planets & Galaxies: Hubble Telescope Pictures from Outer Space
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DescriptionThis is a mind-blowing collection of NASA Hubble space telescope photography, complete with almost 4 Gigabytes of amazing high resolution pictures, images and photos. See our galaxy and stars as you never have before, preserved in their original high resolution ... |
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All About Telescopes and Binoculars
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DescriptionTelescopes and Binoculars teaches how to use your equipment and maximize your instruments potential. Learn all of the applications needed and get the most out of sky watching. Hosted by Bob Bonadurer, Director of the Minneapolis Planetarium, this program makes the subject easy to understand and easy to learn... |
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INTELETOOL: One Pole + Many Heads = Very Cool
Is there any talk about launching telescopes dedicated to monitoring a single specific celestial object?
Just curious. It seems that for some of the more interesting stars, especially the closer ones, it might be a useful thing to have radio telescopes focused upon them at all times. If ever we detect any appreciable amount of life on a distant planet and have indication that it might be technological, would it behoove us to launch a telescope dedicated just to that world?
The problem is to define interesting. Whatever criteria you use, there well be always dozens of stars that fall into that category. So statistically it pays better to monitor a star for a while, and then to jump to the next.
