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davidwhogg / TheThresher

we Don't Throw Away Data (tm).
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relationship to speckle imaging #36

Open davidwhogg opened 12 years ago

davidwhogg commented 12 years ago

we need to figure out how we are related -- conceptually and in performance -- to speckle imaging. I think it might be pretty similar when you drill down to the actual operations.

fedhere commented 12 years ago

BJ has speckle code so he can be very helpful in this

On Tue, May 8, 2012 at 9:53 AM, David W. Hogg < reply@reply.github.com

wrote:

we need to figure out how we are related -- conceptually and in performance -- to speckle imaging. I think it might be pretty similar when you drill down to the actual operations.

Reply to this email directly or view it on GitHub: https://github.com/davidwhogg/LuckyImaging/issues/36

federica bianco UCSB-Las Cumbres Observatory Global Telescope Network 6740 Cortona Dr, Suite 102 / Goleta, CA /

LCOGT.net \ o\ http://secure.lcogt.net/user/fbianco/dev/

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bjfultn commented 12 years ago

I simply sum the 2-d fourier transforms of all the images (http://adsabs.harvard.edu/abs/1970A%26A.....6...85L). The resulting "fringe pattern" can be used to measure the separation and position angle of a binary source (with a 180 degree degeneracy). I believe this method is called "speckle interferometry" rather than "speckle imaging" since I do not reconstruct an image of the stars. From my experience it seems as though the speckle imaging performance is equivalent to lucky imaging performance, but it allows one to measure the positions of the sources with much greater precision.

fedhere commented 12 years ago

but it should be noticed that it is only applicable for small delta mag ranges and the stars have to be very close to each other, to prodice the fringes

On Wed, May 9, 2012 at 4:17 PM, bjfultn < reply@reply.github.com

wrote:

I simply sum the 2-d fourier transforms of all the images ( http://adsabs.harvard.edu/abs/1970A%26A.....6...85L). The resulting "fringe pattern" can be used to measure the separation and position angle of a binary source (with a 180 degree degeneracy). I believe this method is called "speckle interferometry" rather than "speckle imaging" since I do not reconstruct an image of the stars. From my experience it seems as though the speckle imaging performance is equivalent to lucky imaging performance, but it allows one to measure the positions of the sources with much greater precision.

Reply to this email directly or view it on GitHub: https://github.com/davidwhogg/LuckyImaging/issues/36#issuecomment-5614397

federica bianco UCSB-Las Cumbres Observatory Global Telescope Network 6740 Cortona Dr, Suite 102 / Goleta, CA /

LCOGT.net \ o\ http://secure.lcogt.net/user/fbianco/dev/

/|/\ |* Please consider the environment before printing this e-mail