Patent ID: 7043376
Filing Date: 2006-05-09
Classification: G01H,G11B

Abstract:
1. A device for measuring vibration in an article having a rotating member, the device comprising: a motion sensitive transducer attachable to the article comprising an output producing a time domain analog signal in response to the vibration; an analog-to-digital data acquisition member comprising an input connected to the transducer output for sampling the transducer signal and comprising an output producing a time domain digital signal from the sampling; an optic sensor, responsive to a target feature on the rotating member, adapted to detect an instantaneous speed of the rotating member and trigger the data acquisition member to begin sampling when the rotating member is rotating; and a processor comprising an input connected to the data acquisition member output for translating the time domain digital signal to a frequency domain digital signal and determining the magnitude and phase of said frequency domain digital signal at a frequency associated with the instantaneous speed of the rotating member.