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A RF superconducting electromechanical transducer for gravitational wave antennae

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3 Author(s)
Bocko, M.F. ; Dept. of Electr. Eng., Rochester Univ., NY, USA ; Johnson, W.W. ; Iafolla, V.

An electromechanical transducer based on a superconducting radiofrequency bridge circuit has been developed for use on a gravitational radiation detector. The low electrical loss of superconductors has made it possible to achieve electrical quality factors of several thousand in a lumped-element circuit which operates at 4 MHz. The bridge could be remotely balanced to one part in 50000, which led to a displacement noise level of 10-15 m/√Hz. It should be useful in measuring any physical quantity which can be made to change a capacitance. At the present stage of development, capacitance changes of 10-20 F could be detected in a 1-s integration time. One straightforward improvement, namely, the use of a low-phase-noise quartz crystal oscillator as the bridge excitation source will reduce the noise to 10-17 m/√Hz

Published in:

Magnetics, IEEE Transactions on  (Volume:25 ,  Issue: 2 )