Deformation analysis of a communication telescope structure under nonuniform heating using holographic interferometry

Pierre M. Jacquot; Mathias Lehmann; Xavier Colonna de Lega

doi:10.1117/12.303643

18 March 1998 Deformation analysis of a communication telescope structure under nonuniform heating using holographic interferometry

Pierre M. Jacquot, Mathias Lehmann, Xavier Colonna de Lega

Author Affiliations +

Proceedings Volume 3293, Practical Holography XII; (1998) https://doi.org/10.1117/12.303643
Event: Photonics West '98 Electronic Imaging, 1998, San Jose, CA, United States

Abstract

The mechanical behavior of satellite telescope structures, subjected to non-uniform heating, as this occurs in orbit, is examined. In the laboratory, temperature gradients are created either by resistors or by IR lamps. Telescope structures are made of a material of very low thermal expansion coefficient--INVAR or carbon-carbon composite--in order to cope with stringent long term stability requirements in relation to temperature variation. Real time holographic interferometry is used to disclose the micro- deformation of the telescope. A careful implementation of the method is necessary, since, within the fixed temperature range for this study, very small deformations are expected. Monitoring of the heating conditions is achieved by an IR camera and thermocouples. Maps of temperature and of the corresponding interferometric out-of-plane deformation are obtained in parallel. The dynamic phase shifting technique allows to produce time-sequences of such deformation maps. These movies, and the temperature/deformation maps, highlight the structure deformation in a quantitative and dynamic way and suitably determine whether the structures meet their specifications.

Citation Download Citation

Pierre M. Jacquot, Mathias Lehmann, and Xavier Colonna de Lega "Deformation analysis of a communication telescope structure under nonuniform heating using holographic interferometry", Proc. SPIE 3293, Practical Holography XII, (18 March 1998); https://doi.org/10.1117/12.303643

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available