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Variable-reluctance accelerometer

  • US 4,754,644 A
  • Filed: 03/03/1987
  • Issued: 07/05/1988
  • Est. Priority Date: 03/04/1986
  • Status: Expired due to Fees
First Claim
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1. An accelerometer comprising a main permanent magnet, a guide housing said main magnet and enabling it to travel in a given prearranged direction, first and second magnetic field generating means wherein the respective north and south poles are arranged facing identical north and south poles on said main magnet, said first and second magnetic field generating means exerting respective repelling forces on the said main magnet which, when idle, maintain the said main magnet dynamically balanced inside said guide, a coil located between said first and second magnetic field generating means and coaxial in relation to said main magnet and in said traveling direction, an input signal means or providing a constant supply current to said coil including a common base connected transistor having a resistor-capacitor network connected in series across its emitter-base terminal and said coil connected in parallel with the resistor of said resistor-capacitor network, and signal comparator means for comparing the output signal generated by said coil.

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