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The design and test of a detector of small harmonic displacements ispresented. The detector is based on the principle of the parametric conversionof power between the resonant modes of two superconducting coupled microwavecavities. The work is based on the original ideas of Bernard, Pegoraro, Picassoand Radicati, who, in 1978, suggested that superconducting coupled cavitiescould be used as sensitive detectors of gravitational waves, and on the work ofReece, Reiner and Melissinos, who, {in 1984}, built a detector of this kind.They showed that an harmonic modulation of the cavity length l produced anenergy transfer between two modes of the cavity, provided that the frequency ofthe modulation was equal to the frequency difference of the two modes. Theyachieved a sensitivity to fractional deformations of dl/l~10^{-17} Hz^{-1/2}.We repeated the Reece, Reiner and Melissinos experiment, and with an improvedexperimental configuration and better cavity quality, increased the sensitivityto dl/l~10^{-20} Hz^{-1/2}. In this paper the basic principles of the deviceare discussed and the experimental technique is explained in detail. Possiblefuture developments, aiming at gravitational waves detection, are alsooutlined.

A detector of small harmonic displacements based on two coupled microwave cavities