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Dual-frequency microwave sensor

  • US 7,079,029 B2
  • Filed: 10/29/2002
  • Issued: 07/18/2006
  • Est. Priority Date: 10/30/2001
  • Status: Expired due to Fees
First Claim
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1. A dual-frequency microwave sensor, for transmitting two microwaves of different frequencies and, when an object is present in a transmission direction of the microwaves, receiving reflected waves of the microwaves from the object and measuring a distance to the object based on the reflected waves, said sensor comprising:

  • an object detection unit for measuring the distance to the object based on a phase difference of the respective reflected waves and a signal level of the reflected waves from the object.

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