| 摘要 |
A superconducting six-axis accelerometer (SSA) for measuring the linear and angular acceleration of a superconducting proof mass in all six degrees of freedom at the same point in space time. The proof mass is formed of interlocking plates defining three mutually orthogonal planes and is confined and controlled by superconducting circuitry including superconducting levitation coils which suspend the proof mass against the pull of gravity. Detection of a displacement of the proof mass when an acceleration is applied is possible as the Meissner effect forces the inductance of superconducting sensing coils to change in proportion to the displacement of the proof mass. The sensing coils, which may be the same coils as the levitation coils or may be arranged concentrically with respect to separate levitation coils, are arranged in bridge circuits, each bridge circuit being driven by an independent oscillating current through a tank circuit, having a different carrier frequency. The output of each bridge circuit is dependent upon only one degree of freedom, and are each connected in series to a SQUID amplifier. Lock-in amplifiers, each independently tuned to one of the carrier frequencies, demodulate the SQUID output to recover the individual accelerations.
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