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Noncontact Measurement Of Shaft Speed, Torque, And PowerNoncontact fiber-optic sensor and associated electronic equipment measure twist and speed of rotation of shaft. Measurements determine torque and power. Response of sensor remains linear even at cryogenic temperatures. Reflective strips on rotating shaft reflect two series of light pulses back into optical system. Bidirectional coupler in each of two optical fiber paths separates reflected light from incident light, sending it to photodiode for output to analog-to-digital converter and computer. Sensor requires no slip rings or telemetry to transfer signals from shaft. Well suited for providing data on performances of turbopumps for such cryogenic fluids as liquid oxygen and liquid hydrogen.
Document ID
19930000004
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Tech Brief
Authors
Madzsar, George C.
(NASA Lewis Research Center, Cleveland, OH.)
Date Acquired
August 16, 2013
Publication Date
January 1, 1993
Publication Information
Publication: NASA Tech Briefs
Volume: 17
Issue: 1
ISSN: 0145-319X
Subject Category
Electronic Systems
Report/Patent Number
LEW-15099
Accession Number
93B10004
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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