Multiwavelength heterodyne array system for large space optics control

Lenore J. McMackin; David G. Voelz; Matthew P. Fetrow; Harold D. McIntire; Kenneth P. Bishop; Mervyn J. Kellum

doi:10.1117/12.333657

21 December 1998 Multiwavelength heterodyne array system for large space optics control

Lenore J. McMackin, David G. Voelz, Matthew P. Fetrow, Harold D. McIntire, Kenneth P. Bishop, Mervyn J. Kellum

Author Affiliations +

Proceedings Volume 3498, Sensors, Systems, and Next-Generation Satellites II; (1998) https://doi.org/10.1117/12.333657
Event: Remote Sensing, 1998, Barcelona, Spain

Abstract

Large, lightweight optical mirrors for space applications will require systems for controlling the gross aspects of the mirror surface figure. We have developed an autonomously operating wavefront measurement system based on dual- wavelength heterodyne distance measurement techniques combined with heterodyne array imaging. A key feature of the technique is variable optical path length measurement sensitivity that allows the system to measure surface figure errors ranging from thousands of wavelengths down to fractions of a wavelength. Automatic sensitivity tuning combined with completely digital phase measurement over the entire surface allows the integration of this device in automated sensing and optical correction schemes. It is particularly suited for the measurement and control of spatially and temporally variable optical surfaces of the kind that would be found in a space- based adaptive optics system. In this paper we demonstrate aspects of the automated super-heterodyne system on an optical surface with surface profile structure height that varies from micron to mm sized features. We describe the hardware and software design of the heterodyne based measurement system that enable it to choose the appropriate synthetic wavelength to measure different areas of the surface profile. Spatial processing methods are discussed that allow the system to merge segments of large scale images that have been measured at different synthetic wavelengths.

Citation Download Citation

Lenore J. McMackin, David G. Voelz, Matthew P. Fetrow, Harold D. McIntire, Kenneth P. Bishop, and Mervyn J. Kellum "Multiwavelength heterodyne array system for large space optics control", Proc. SPIE 3498, Sensors, Systems, and Next-Generation Satellites II, (21 December 1998); https://doi.org/10.1117/12.333657

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