NDLI: Compact simultaneous-beam optical strain measurement system, phase 5

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Compact simultaneous-beam optical strain measurement system, phase 5

Content Provider	NASA Technical Reports Server (NTRS)
Author	Lant, Christian T.
Copyright Year	1994
Description	Recent advances on the laser speckle strain measurement system under development at NASA Lewis Research Center have resulted in a compact, easy-to-use measurement package having many performance improvements over previous systems. NASA has developed this high performance optical strain measurement system for high temperature material testing applications. The system is based on I. Yamaguchi's two-beam speckle-shift strain measurement theory, and uses a new optical design that allows simultaneous recording of laser speckle patterns. This design greatly improves system response over previous implementations of the two-beam speckle-shift technique. The degree of immunity to transient rigid body motions is no longer dependent on the data transfer rate. The system automatically calculates surface strains at a frequency of about 5 Hz using a high speed digital signal processor in a personal computer. This system is fully automated, and can be operated remotely. This report describes the designs and methods used by the system, and shows low temperature strain test results obtained from small diameter tungsten-rhenium and palladium-chrome wires.
File Size	4781354
Page Count	10
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19950007253
Archival Resource Key	ark:/13960/t49p8004j
Language	English
Publisher Date	1994-10-01
Access Restriction	Open
Subject Keyword	Optics Signal Analyzers Digital Systems Speckle Patterns Nonintrusive Measurement High Temperature Tests Surface Properties Signal Processing Strain Measurement Laser Applications Optical Measuring Instruments Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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