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Proceedings Paper

Design And Tolerance Analysis Of Null Lens For Testing Hyperboloid Concave Mirror
Author(s): K. K. Saxena; D. V. B. Rao; N. J. Babu; T. K. Alex
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Paper Abstract

A null lens is described to test the hyperboloid primary mirror of Very High Resolution Radiometer (VHRR) telescope. It can be used to test a variety of optical systems or components. Conics and higher order aspheric mirrors can be tested with the same null lens if it can zoom the amount of spherical aberration introduced. It is a triplet lens with all spherical surfaces. The output F/No. and image position remains fixed during the zoom. The performance of this device has been analysed for hyperboloid mirror of diameter of 208 mm which works at F/2.0. The performance has been characterised by RMS wave front deformations. Test set up has been analysed for centered and decentered tolerances, irregularity in surfaces, single surface decenter and displacements and a group decentering tolerances. Final tolerance parameters for null lens have been tabulated.

Paper Details

Date Published: 28 September 1987
PDF: 6 pages
Proc. SPIE 0805, Optical Components and Systems, (28 September 1987); doi: 10.1117/12.941371
Show Author Affiliations
K. K. Saxena, ISRO Satellite Centre (India)
D. V. B. Rao, ISRO Satellite Centre (India)
N. J. Babu, ISRO Satellite Centre (India)
T. K. Alex, ISRO Satellite Centre (India)

Published in SPIE Proceedings Vol. 0805:
Optical Components and Systems
Andre Masson, Editor(s)

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