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Calibration and testing of the 6.5 m...

Johnson, Robert Lee.

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Calibration and testing of the 6.5 m MMT adaptive optics system.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Calibration and testing of the 6.5 m MMT adaptive optics system./
Author:	Johnson, Robert Lee.
Description:	210 p.
Notes:	Director: Roger P. Angel.
Contained By:	Dissertation Abstracts International62-04B.
Subject:	Physics, Astronomy and Astrophysics. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3010192
ISBN:	0493202528

Calibration and testing of the 6.5 m MMT adaptive optics system.
Johnson, Robert Lee.

Calibration and testing of the 6.5 m MMT adaptive optics system. - 210 p.

Director: Roger P. Angel.

Thesis (Ph.D.)--The University of Arizona, 2001.

This dissertation describes the development, calibration, and testing of the adaptive optics system for the 6.5 m Multiple Mirror Telescope. By employing a deformable secondary mirror, the MMT adaptive optics system uniquely solves several problems typical of astronomical adaptive optics systems. Extra components are eliminated, improving throughput and reducing emissivity. Since the adaptive secondary is integral to the telescope, a corrected beam is presented to any instrument mounted at Cassegrain focus.

ISBN: 0493202528Subjects--Topical Terms:

1019521
Physics, Astronomy and Astrophysics.

Calibration and testing of the 6.5 m MMT adaptive optics system.
LDR:03236nam 2200301 a 45 001 926592
005 20110422
008 110422s2001 eng d
020 $a 0493202528
035 $a (UnM)AAI3010192
035 $a AAI3010192
040 $a UnM $c UnM
100 1 $a Johnson, Robert Lee. $3 1250177
245 1 0 $a Calibration and testing of the 6.5 m MMT adaptive optics system.
300 $a 210 p.
500 $a Director: Roger P. Angel.
500 $a Source: Dissertation Abstracts International, Volume: 62-04, Section: B, page: 1925.
502 $a Thesis (Ph.D.)--The University of Arizona, 2001.
520 $a This dissertation describes the development, calibration, and testing of the adaptive optics system for the 6.5 m Multiple Mirror Telescope. By employing a deformable secondary mirror, the MMT adaptive optics system uniquely solves several problems typical of astronomical adaptive optics systems. Extra components are eliminated, improving throughput and reducing emissivity. Since the adaptive secondary is integral to the telescope, a corrected beam is presented to any instrument mounted at Cassegrain focus.
520 $a The testing of an adaptive mirror, which is large and convex, poses a new and difficult problem. I present a test apparatus that allows complete calibration and operation, in closed-loop, of the entire adaptive optics system in the laboratory. The test apparatus replicates the optical path of the telescope with a wavefront error of less than 500 nm <smcap>RMS</smcap>. To simulate atmospheric turbulence, machined acrylic plates are included. A phase-shifting interferometer allows calibration of the Shack-Hartmann wavefront sensor and reconstruction algorithms; comparisons agree to one-third of the root-mean-square wavefront. First, techniques were developed to align the apparatus and measure residual aberration. Then, the wavefront sensor was calibrated by measuring its response to introduced tilt. Lastly, a Fourier wave-optics approach was used to produce a modal wavefront reconstructor.
520 $a The adaptive secondary mirror uses electro-magnetic force actuators. Capacitive position sensors are placed at each actuator to permit control of the mirror shape without measuring the reflected wavefront. These sensors have nanometer resolution, but require calibration. To calibrate the sensors, I developed a small optical instrument which measures the thickness of transparent films to an absolute accuracy of 5 nm with a precision of 2 nm. The device has applications far beyond the scope of this research. Twenty-four of these optical gap sensors have been built to calibrate the 336 capacitive sensors on the adaptive secondary mirror. Mirror displacements measured using gap sensors and a phase-shifting interferometer agree to 2 percent of the displacement. The gap sensors allow for quick and accurate calibration of the capacitive sensors without the difficulty of installing an interferometer on the telescope.
590 $a School code: 0009.
650 4 $a Physics, Astronomy and Astrophysics. $3 1019521
650 4 $a Physics, Optics. $3 1018756
690 $a 0606
690 $a 0752
710 2 0 $a The University of Arizona. $3 1017508
773 0 $t Dissertation Abstracts International $g 62-04B.
790 $a 0009
790 1 0 $a Angel, Roger P., $e advisor
791 $a Ph.D.
792 $a 2001
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3010192