Self-calibrating vibration sensor
First Claim
Patent Images
1. A system comprising:
- a vibration sensor having an antenna to transmit and receive RF energy;
a self calibration actuator to vibrate the antenna in a direction generally normal to the antenna surface; and
a calibration module to receive responses received by the antenna to calibrate the vibration sensor;
wherein the self calibration actuator comprises a rotating wheel having an offset center of rotation.
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Abstract
An antenna in a radar sensor is vibrated at a known frequency and velocity in a direction generally normal to the antenna surface. A response received by the antenna is used to scale or calibrate sensor responses at frequencies of interest.
18 Citations
18 Claims
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1. A system comprising:
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a vibration sensor having an antenna to transmit and receive RF energy; a self calibration actuator to vibrate the antenna in a direction generally normal to the antenna surface; and a calibration module to receive responses received by the antenna to calibrate the vibration sensor; wherein the self calibration actuator comprises a rotating wheel having an offset center of rotation. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method comprising:
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transmitting and receiving RF energy from an antenna of an RF vibration sensor toward a target; moving the antenna orthogonal to the target at a known velocity; and adjusting a calibration of the RF vibration sensor responsive to received signals while moving the antenna; wherein the antenna is moved by a rotating wheel having an offset center of rotation. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A computer readable storage device having instructions stored thereon to cause a computer system to control a method, the method comprising:
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transmitting and receiving RF energy from an antenna of a radar based vibration sensor toward a vibrating target; vibrating the antenna orthogonal to the target at a known frequency and displacement; and adjusting a calibration of the radar vibration sensor responsive to received signals; wherein the antenna is moved by a rotating wheel having an offset center of rotation. - View Dependent Claims (17, 18)
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Specification