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The MicroStrain Nano-DVRT wireless sensors clamped to the Liberty Bell.
A close-up view of the MicroStrain Nano-DVRT wireless sensors clamped to the Liberty Bell (the top and bottom sensors are the same design, but oriented perpendicular to each other). With even tiny motions of the crack--on the scale of millionths of a meter--the metal rod shifts its placement. The movement is detected by electrical coils, and that information is transmitted to a wireless receiver. The wires visible in this image are connecting the sensors to a wireless transmitter inside the Bell.
Credit: Curt Suplee, National Science Foundation
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