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Optical fiber sensors for the non-destructive evaluation of materialsThe operation of the modal domain vibration sensor was demonstrated in several simple vibrational systems. Two apparent advantages are the sensors bandwidth and sensitivity. An inherent drawback of standard vibration detection devices is their rapid cost increase with high frequency bandwidth. This sensor showed consistent response in the freqency range of 1.5 to 400 Hz. By imparting very small but measurable excitations in the structures, the sensors ability to respond to very low order vibration induced strain was established. Dynamic ranges on the order of 18 to 22 dB for the CF beam and string systems respectively were observed. The sensor itself represents a very simple system: a coherent source, a single fiber and a low bandwidth detector. The inherent advantages of ruggedness and immunity to external radiation can also be added. Finally, the sensor minimally impairs structural motion through loading, an advantage in monitoring small vibrations or lightweight structures. Some drawbacks of the sensor are also noted.
Document ID
19870016927
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Date Acquired
September 5, 2013
Publication Date
December 1, 1986
Subject Category
Quality Assurance And Reliability
Report/Patent Number
NASA-CR-180557
NAS 1.26:180557
Accession Number
87N26360
Funding Number(s)
CONTRACT_GRANT: NAG1-679
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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