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Laser Metrology Sensing and Control for Large Segmented-Mirror TelescopesDescribed an optical hexapod metrology concept: a) Can work together with edge sensors; b) Can measure M1 - M2 distance and M1 global curvature. Swept-frequency laser metrology system: a) Absolute optical path length measurement (approx.1 micron); b) Relative optical path length measurement (approx.nm) Air turbulence is a concern for ground-based telescopes and needs further study.
Document ID
20080022256
Acquisition Source
Jet Propulsion Laboratory
Document Type
Preprint (Draft being sent to journal)
External Source(s)
hdl:2014/40796
Authors
Zhao, Feng (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Rao, Shanti (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Ksendzov, Alex (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Kadogawa, Hiroshi (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Date Acquired
August 24, 2013
Publication Date
May 30, 2006
Subject Category
Optics
Report/Patent Number
SPIE 6267-81
Distribution Limits
Public
Copyright
Other
Keywords
large telescopes
interferometery
metrology

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