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The Practical Implementation of Non-Contacting Laser Strain Measurements SystemsMeasurement of stress and strain in rotating turbomachinery is critical to many industries. The search for a non-contacting, non-interfering, non-degrading measurement system is on going and extensive. While several methods seem promising in theory, implementation has proven troublesome. This work uncovers and quantifies these implementation issues in the context of a laser measurement system. Both a Laser Doppler Velocimeter system and a displacement laser system are utilized. It is found that the key issues are signal to noise ratio, rigid body compensation, measurement location, and conversion of intermittent measurements to a continuous signal. Accounting for these factors leads to successful measurements. These results should lead to better ideas and more practical solutions to the non-contacting, non-degrading, non-interfering strain measurement system problem.
Document ID
20000025205
Acquisition Source
Kennedy Space Center
Document Type
Preprint (Draft being sent to journal)
Authors
Yunis, Isam (NASA Kennedy Space Center Cocoa Beach, FL United States)
Quinn, roger D. (Case Western Reserve Univ. Cleveland, OH United States)
Kadambi, Jaikrishnan R. (Case Western Reserve Univ. Cleveland, OH United States)
Date Acquired
September 7, 2013
Publication Date
January 1, 2000
Subject Category
Lasers And Masers
Report/Patent Number
NAS 1.15:208563
NASA/TM-2000-208563
AIAA Paper 2000-1696
Meeting Information
Meeting: Structures, Structural Dynamics, and Materials Conference
Location: Atlanta, GA
Country: United States
Start Date: April 3, 2000
End Date: April 6, 2000
Sponsors: American Society of Mechanical Engineers, American Helicopter Society, American Society of Civil Engineers, American Society for Composites, American Inst. of Aeronautics and Astronautics
Distribution Limits
Public
Copyright
Public Use Permitted.

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