Measuring and testing – Vibration – Sensing apparatus
Patent
1985-03-18
1986-08-26
Ciarlante, Anthony V.
Measuring and testing
Vibration
Sensing apparatus
G01N 2900
Patent
active
046075291
ABSTRACT:
The present invention provides a method for measuring vibration in a machine including a member under periodic motion. To measure vibration in a rotating shaft (11) a first signal comprising a series of impulses, one impulse occurring each shaft revolution, is generated by a proximity probe (20) and a modulator/demodulator (22). The first signal is transmitted to channel A of a FFT spectrum analyzer (19) and a second signal, which varies in time with respect to displacement of the shaft (11), is produced by a proximity probe (14) and a modulator/demodulator (18) and fed to channel B of the FFT analyzer (19). The second signal is fourier transformed by analyzer (19) into the frequency domain to obtain reconstruction magnitude signals each indicative of the magnitude of one of the first twelve harmonics of the transformed second signal. The first signal is fourier transformed by the analyzer (19) synchronously with the second signal to obtain the phase angle differences between the respective harmonic components of each signal for the first twelve components. The mark to space ratio of the first signal is chosen to be less than one-twelfth so that the phase angles of the first twelve harmonic components of the fourier transformed first signal are known to be zero.
REFERENCES:
patent: 4426641 (1984-01-01), Kurihara et al.
patent: 4429578 (1984-02-01), Darrel et al.
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