Time gated listening device for machinery analysis

Details Time gated listening device for machinery analysis Time gated listening device for machinery analysis

1992-10-07

1995-05-16

Chilcot, Jr., Richard E.

Measuring and testing

Vibration

Sensing apparatus

73593, G01M 1302, G01H 100, G01H 1100, G01N 2900

Patent

active

054150469

ABSTRACT:
A microphone, coupled to the machinery under test, is connected via a blanking amplifier to a headset speaker. A sync generator, coupled to the machinery, generates a pulse each time the machinery passes through a reference position. This sync pulse sequence is the input to a phase locked loop which produces an internal representation of the instantaneous phase position of the machinery. Each time this phase position reaches an operator designated phase position, the blanking amplifier is unblanked for a duration designated by the operator so that only the operator designated segment of the machinery cycle is audible.

REFERENCES:
patent: 4298948 (1981-11-01), Davis
patent: 4426641 (1984-01-01), Kurihara et al.
patent: 4704906 (1987-11-01), Churchill et al.

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