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New technologies for polishing and testing large optics.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	New technologies for polishing and testing large optics./
作者:	Wizinowich, Peter Lindsay.
面頁冊數:	1 online resource (179 pages)
附註:	Source: Dissertations Abstracts International, Volume: 51-08, Section: B.
Contained By:	Dissertations Abstracts International51-08B.
標題:	Optics. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9005730click for full text (PQDT)
ISBN:	9798206851502

New technologies for polishing and testing large optics.
Wizinowich, Peter Lindsay.

New technologies for polishing and testing large optics. - 1 online resource (179 pages)

Source: Dissertations Abstracts International, Volume: 51-08, Section: B.

Thesis (Ph.D.)--The University of Arizona, 1989.

Includes bibliographical references

Two new technologies, for polishing and testing large optics, are presented in this dissertation. The first is a new approach to generating and polishing aspheric surfaces which utilizes a full size stressed lap. The lap specifications are chosen to automatically generate a specific amount of spherical aberration. The required comatic distortion of the lap is induced by a system of levers and springs which are stretched and relaxed as the lap moves. A lap was constructed to grind and polish a 20cm glass blank. The resultant polished surface, in agreement with the predicted asphericity, has 28 microns of spherical aberration at its edge, appropriate for a F/2.0 convex paraboloid. The average radial profile has a residual peak-to-valley error of 200nm and an rms error of 60nm. This experiment serves as a first successful test of the stressed lap concept and as a demonstration of a new method for generating aspheric secondary mirrors. The second new technology is concerned with testing large optics where vibrations can be a serious problem. A modification to the usual phase shifting interferometry reduction algorithm permits measurements to be taken fast enough to essentially freeze out vibrations. Only two interferograms are needed with an exact phase relationship; and these can be recorded very rapidly on either side of the interline transfer of a standard CCD video camera, prior to charge transfer readout. The third required interferogram is a null. An analysis of potential phase errors was performed for this "2+1" algorithm. In the developed implementation, two frequencies, dv/v≈10ˉ⁸, are generated with orthogonal polarizations. A Pockels cell rapidly switches the frequency entering the interferometer, resulting in a phase shift over the long path difference of the interferometer. The two time critical interferograms are acquired with a 1ms separation resulting in a reduction in sensitivity to vibration of one to two orders of magnitude. Laboratory tests were performed to compare this "2+1" system with a commercial phase shifting package. Similar phase determination accuracies were found when vibrations were low. However, the "2+1" system also succeeded when vibrations were large enough to wash out video rate fringes.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2023

Mode of access: World Wide Web

ISBN: 9798206851502Subjects--Topical Terms:

517925
Optics.
Index Terms--Genre/Form:

542853
Electronic books.

New technologies for polishing and testing large optics.
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100 1 $a Wizinowich, Peter Lindsay. $3 3698326
245 1 0 $a New technologies for polishing and testing large optics.
264 0 $c 1989
300 $a 1 online resource (179 pages)
336 $a text $b txt $2 rdacontent
337 $a computer $b c $2 rdamedia
338 $a online resource $b cr $2 rdacarrier
500 $a Source: Dissertations Abstracts International, Volume: 51-08, Section: B.
500 $a Publisher info.: Dissertation/Thesis.
500 $a Advisor: Angel, J. Roger. P.
502 $a Thesis (Ph.D.)--The University of Arizona, 1989.
504 $a Includes bibliographical references
520 $a Two new technologies, for polishing and testing large optics, are presented in this dissertation. The first is a new approach to generating and polishing aspheric surfaces which utilizes a full size stressed lap. The lap specifications are chosen to automatically generate a specific amount of spherical aberration. The required comatic distortion of the lap is induced by a system of levers and springs which are stretched and relaxed as the lap moves. A lap was constructed to grind and polish a 20cm glass blank. The resultant polished surface, in agreement with the predicted asphericity, has 28 microns of spherical aberration at its edge, appropriate for a F/2.0 convex paraboloid. The average radial profile has a residual peak-to-valley error of 200nm and an rms error of 60nm. This experiment serves as a first successful test of the stressed lap concept and as a demonstration of a new method for generating aspheric secondary mirrors. The second new technology is concerned with testing large optics where vibrations can be a serious problem. A modification to the usual phase shifting interferometry reduction algorithm permits measurements to be taken fast enough to essentially freeze out vibrations. Only two interferograms are needed with an exact phase relationship; and these can be recorded very rapidly on either side of the interline transfer of a standard CCD video camera, prior to charge transfer readout. The third required interferogram is a null. An analysis of potential phase errors was performed for this "2+1" algorithm. In the developed implementation, two frequencies, dv/v≈10ˉ⁸, are generated with orthogonal polarizations. A Pockels cell rapidly switches the frequency entering the interferometer, resulting in a phase shift over the long path difference of the interferometer. The two time critical interferograms are acquired with a 1ms separation resulting in a reduction in sensitivity to vibration of one to two orders of magnitude. Laboratory tests were performed to compare this "2+1" system with a commercial phase shifting package. Similar phase determination accuracies were found when vibrations were low. However, the "2+1" system also succeeded when vibrations were large enough to wash out video rate fringes.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2023
538 $a Mode of access: World Wide Web
650 4 $a Optics. $3 517925
650 4 $a Astrophysics. $3 535904
655 7 $a Electronic books. $2 lcsh $3 542853
690 $a 0752
690 $a 0596
710 2 $a ProQuest Information and Learning Co. $3 783688
710 2 $a The University of Arizona. $3 1017508
773 0 $t Dissertations Abstracts International $g 51-08B.
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9005730 $z click for full text (PQDT)