Saw-Based Tachometer or RPM Detector
First Claim
1. A method for determining a number of revolutions per minute (RPM) of a rotating object, comprising:
- transmitting interrogation signals at a regular period from a fixed antenna positioned adjacent to the rotating object;
transmitting echo signals from a sensor antenna positioned on the rotating object, in response to the interrogation signals;
counting a number of echo signals detected by the fixed antenna during one revolution of the object; and
determining the RPM of the rotating object based on the number of echo signals and the regular period of the signals.
2 Assignments
0 Petitions
Accused Products
Abstract
A method is provided for determining a number of revolutions per minute (RPM) of a rotating object. The method includes transmitting interrogation signals at a regular period from a fixed antenna positioned adjacent to the rotating object. The method also includes transmitting echo signals from a sensor antenna positioned on the rotating object, in response to the interrogation signals. The method also includes counting a number of echo signals detected by the fixed antenna, during one revolution of the object. The method also includes determining the RPM of the rotating object based on the number of response signals and the regular period of the signals. A system is also provided for determining the number of revolutions per minute (RPM) of the rotating object.
3 Citations
17 Claims
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1. A method for determining a number of revolutions per minute (RPM) of a rotating object, comprising:
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transmitting interrogation signals at a regular period from a fixed antenna positioned adjacent to the rotating object; transmitting echo signals from a sensor antenna positioned on the rotating object, in response to the interrogation signals; counting a number of echo signals detected by the fixed antenna during one revolution of the object; and determining the RPM of the rotating object based on the number of echo signals and the regular period of the signals. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for determining a number of revolutions per minute (RPM) of a rotating object, comprising:
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transmitting interrogation signals at a regular period from a fixed antenna positioned adjacent to the rotating object; transmitting echo signals from a sensor antenna positioned on the rotating object, in response to the interrogation signals; starting a count of the echo signals upon determining that the echo signal detected by the fixed antenna has crossed a threshold value; stopping the count of the echo signals upon determining that the echo signal has re-crossed the threshold value after one revolution of the object; and determining the RPM of the rotating object based on the count of the echo signals and the regular period of the signals. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A system for determining a number of revolutions per minute (RPM) of a rotating object, comprising:
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a fixed antenna positioned adjacent to the rotating object, said fixed antenna configured to transmit interrogation signals at a regular period; a sensor antenna positioned on the rotating object, said sensor antenna configured to transmit echo signals in response to the interrogation signals; and a controller coupled to the fixed antenna, said controller configured to count a number of echo signals detected by the fixed antenna during one revolution of the object and said controller configured to determine the RPM of the rotating object based on the number of echo signals and the regular period of the signals. - View Dependent Claims (15, 16, 17)
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Specification