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PPT : Adaptive Optics in Ground Based Telescopes Seminar with Free Download

Published on Feb 21, 2020


Slide 1 :



Adaptive Optics in Ground Based Telescopes

Slide 2 :


==> Adaptive optics is a new technology which in effect removes this atmospheric tremor and helps the astronomers see the images through earth based telescopes more brightly

==> Without using this system, the images obtained through telescopes on earth are seen to be blurred, which is caused by the turbulent mixing of air at different temperatures

==> It brings together the latest in computers, material science, electronic detectors, and digital control in a system that warps and bends a mirror in a telescope to counteract, in real time the atmospheric distortion

Slide 3 :

What Is Adaptive Optics ?

==> Adaptive optics refers to optical systems which adapt to compensate for optical effects introduced by the medium between the object and its image

==> In order to avoid atmospheric aberration, one can turn to larger telescopes on the ground, which have been equipped with ADAPTIVE OPTICS system.

==> With this setup, the image quality that can be recovered is close to that the telescope would deliver if it were in space.

==> Images obtained from the adaptive optics system on the 6.5 m diameter telescope, called the MMT telescope illustrate the impact

Slide 4 :

Basic Principle

==> An adaptive optics system reflattens the wave fronts by reflecting the light of a deformable mirror whose shape is changed in real time to introduce an equal but opposite distortion

==> The information on how to distort the mirror comes from a wave front sensor, an instrument that measures optical aberration imposed by the atmosphere on light from a star.

==> After the light reflects of the deformable mirror, a beam splitter sends part of the light to a camera that will capture the high resolution image produced by the adaptive optics

Slide 5 :

Basic Functional Diagram

==> Figure

Slide 6 :

Seeing Infrared

==> In the infrared, the hardware of adaptive optics consists of an existing telescope, complete with its primary and secondary mirrors, and adds a separate box of optics, including the deformable mirror, to perform the atmospheric compensation

==> One is that each additional optical surface beam train absorbs some of the light from the target object in the sky, making the object appear fainter.

==> Also it emits light by virtue of its warmth, introducing thermal noise, further degrading the astronomers, ability to detect faint objects

Slide 7 :

What do we require?

==> Figure

Slide 8 :

Other Stars, Other Earths

==> Perhaps the most exciting scientific program to benefit from the new approach to adaptive optics will be to look at Jupiter like planets orbiting other stars.

==> Roughly 100 such stars have been found out through observations of the effects on the motion of their parent stars, but none has ever be seen by direct imaging.

==> It happens because they are extraordinarily faint and to compound the problem, they are right next to something that is enormously brighter

Slide 9 :


==> There are many substantial technological challenges in AO.

==> Among them are the development of fast, very low-noise detectors in order to be able to correct with fainter reference stars; high-power reliable & easy to operate sodium lasers; very fast processors exceeding 109 to 1010 operations per second; deformable mirrors with bandwidths of several kilohertz and with thousands of actuators, and large secondary adaptive mirrors.

==> The latter are especially interesting at thermal wavelengths, where any additional mirror raises the already huge thermal background seen by the instruments

Slide 10 :



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