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Amplification circuit for increasing variable reluctance sensor output

  • US 6,909,277 B2
  • Filed: 03/13/2002
  • Issued: 06/21/2005
  • Est. Priority Date: 03/13/2002
  • Status: Active Grant
First Claim
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1. An apparatus that measures a characteristic of a machine, comprising:

  • a variable reluctance sensor (VRS) coupled to said machine and operative to generate a basic output signal having a basic frequency representative of said characteristic;

    a resistive element electrically coupled to said VRS and operative to filter a portion of said basic output signal having a frequency at a prescribed level, said resistive element in combination with an inductance of said VRS generating a filtered output signal, wherein said filtered output signal is indicative of a current produced by said basic output signal; and

    a controller coupled to said VRS and operative to determine said characteristic and decouple said resistive element when said characteristic exceeds a prescribed threshold level.

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