We present the design, development, and test of a resonant capacitive transducer for gravitational wave antennas suitable for back-action-evading measurements. We describe a detailed theoretical model of such a transducer, analyze the general requirements that it must satisfy, and report the results of some tests at low temperatures. We obtain on our prototype a good value of the mechanical merit factor (2.8×{}10⁶), a satisfactory geometrical balance, and a good stability of the electrical and geometrical parameters. The bridge readout circuit was balanced down to 0.8 ppm and an electrical quality factor Qₑ{}6×{}10³ was measured for the electrical resonance at 123 kHz. The noise behavior of the system is in satisfactory agreement with the values predicted by our theoretical model.
No takes yet. Share an insight, caveat, or question.
Cinquegrana et al. (1993) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: