We have developed a prototype of a novel strain transducer. The change in magnetic reluctance in a ferromagnetic thorus with a gap due to the applied strain is detected by a superconducting magnetometer (SQUID). Strains as small as Δl/l=10−10 have been detected on a bandwidth of 1 Hz up to 16.7 kHz in a reduced sensitivity version of the apparatus. Further experimentation at higher sensitivity with the present experimental setup is prevented by the background mechanical noise of the building.
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Adami et al. (1977) studied this question.
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