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Speed sensor for rotatable shaft using shaft mounted antenna

  • US 5,459,397 A
  • Filed: 11/23/1992
  • Issued: 10/17/1995
  • Est. Priority Date: 11/23/1992
  • Status: Expired due to Term
First Claim
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1. A speed sensor for a rotatable shaft comprising antenna means for transmitting electromagnetic energy into the shaft, means for detecting at least a portion of electromagnetic energy that exits the shaft, and means disposed for rotation with the shaft for modulating said electromagnetic energy in relation to the shaft rotation speed.

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