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Modified Phasemeter for a Heterodyne Laser InterferometerModifications have been made in the design of instruments of the type described in "Digital Averaging Phasemeter for Heterodyne Interferometry". A phasemeter of this type measures the difference between the phases of the unknown and reference heterodyne signals in a heterodyne laser interferometer. The phasemeter design lacked immunity to drift of the heterodyne frequency, was bandwidth-limited by computer bus architectures then in use, and was resolution-limited by the nature of field-programmable gate arrays (FPGAs) then available. The modifications have overcome these limitations and have afforded additional improvements in accuracy, speed, and modularity. The modifications are summarized.
Document ID
20100012802
Acquisition Source
Jet Propulsion Laboratory
Document Type
Other - NASA Tech Brief
External Source(s)
http://www.techbriefs.com/component/content/article/7824
Authors
Loya, Frank M. (California Inst. of Tech. Pasadena, CA, United States)
Date Acquired
August 24, 2013
Publication Date
April 1, 2010
Publication Information
Publication: NASA Tech Briefs, April 2010
Subject Category
Instrumentation And Photography
Report/Patent Number
NPO-45484
Distribution Limits
Public
Copyright
Public Use Permitted.

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