A novel strain gauge for QNDE of composites

Vierko¨tter, Stephanie A.
May 2000
AIP Conference Proceedings;2000, Vol. 509 Issue 1, p2037
Academic Journal
Quantum Magnetics, Inc. has recently demonstrated the feasibility of a novel strain sensor for the quantitative nondestructive evaluation of composites and polymers. The sensor is based on the principle of Nuclear Quadrupole Resonance (NQR), a method that is related to Nuclear Magnetic Resonance (NMR) with the important difference that a static magnetic field is not required. The technique turns the composite material itself into the sensor, with the strain measurements read directly from the object by a remote transceiver. A small amount of tiny, additive crystals are mixed homogeneously throughout the composite during manufacture. A radio frequency coil interrogates the structure via application of radio frequencies (RF). The in-situ sensors, i.e., the additive crystals embedded in the composite, give a strain dependent RF response. Strain is detected and quantified by measuring this frequency response. This method leads to a non-contact, passive sensor, which provides real-time, dynamic strain information at any point in the structure. The NQR strain sensor does not require embedding or attaching wires/cables to the composite and is easy to implement. The technique will employ single-sided detection and cap be used to map strain in any region of the structure and at any time during the service life. © 2000 American Institute of Physics.


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