Method for continuously calibrating an optical vibration sensor
First Claim
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1. A method for calibrating a vibration sensor attached to equipment, comprising the steps of:
- (a) obtaining a vibration signal, corresponding to vibration of the equipment, from the vibration sensor;
(b) extracting a beat frequency vibration signal having a beat frequency from the vibration signal obtained in step (a);
(c) computing a resonant frequency of the vibration sensor in dependence upon the beat frequency extracted in step (b); and
(d) calibrating the vibration sensor in dependence upon the resonant frequency computed in step (c).
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Abstract
An optical vibration sensor is automatically calibrated by extracting a beat frequency vibration signal from a vibration signal produced by the optical vibration sensor, computing a resonant frequency of the optical vibration sensor using the beat frequency which has been extracted, and calibrating the optical vibration sensor based on the resonant frequency computed. The calibration method continuously compensates for changes in the resonant frequency due to temperature and mechanical changes of the optical vibration sensor. The optical vibration sensor is physically attached to an end-winding of an electrical generator.
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Citations
15 Claims
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1. A method for calibrating a vibration sensor attached to equipment, comprising the steps of:
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(a) obtaining a vibration signal, corresponding to vibration of the equipment, from the vibration sensor; (b) extracting a beat frequency vibration signal having a beat frequency from the vibration signal obtained in step (a); (c) computing a resonant frequency of the vibration sensor in dependence upon the beat frequency extracted in step (b); and (d) calibrating the vibration sensor in dependence upon the resonant frequency computed in step (c). - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A vibration sensing system for equipment, comprising:
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vibration sensor means, attached to the equipment, for producing a vibration signal in dependence upon vibration of the equipment; and control means for calibrating said vibration sensor means by extracting a beat frequency vibration signal having a beat frequency from the vibration signal produced by said vibration sensor means, computing a resonant frequency of said vibration sensor means in dependence upon the beat frequency, and calibrating the vibration sensor based on the resonant frequency. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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Specification