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How to Calibrate Edge Sensors on Segmented Mirror TelescopesThe next generation of large ground based telescopes use segmented mirrors. Sensors mounted on the edge of the segments measure the relative heights of the segments. The segments are actively controlled in height by three actuators per segment, but lateral motion is only passively constrained. Thus there will be some small change in the gap and shear between segments as changing telescope orientation and temperature make small distortions in the telescope structure. These "in-plane" motions place an additional performance burden on the edge sensors, and on the precision with which they must be mounted relative to the optical surface. In addition, both the scaling and offset of sensor edge height readings also vary with changes in gap.
Document ID
20130000252
Acquisition Source
Jet Propulsion Laboratory
Document Type
Conference Paper
External Source(s)
Authors
Shelton, Chris
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Roberts, Lewis C, Jr.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Date Acquired
August 27, 2013
Publication Date
July 3, 2012
Subject Category
Optics
Meeting Information
Meeting: SPIE Astronomical Telescopes+Instrumentation
Location: Amsterdam
Country: Netherlands
Start Date: July 1, 2012
End Date: July 6, 2012
Distribution Limits
Public
Copyright
Other
Keywords
segmented mirrors
calibration
edge sensors
capacitive sensor
Extremely Large Telescopes

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