Frequency detector

Details Frequency detector Frequency detector

1979-11-14

1982-08-17

Kreitman, Stephen A.

Measuring and testing

Vibration

Sensing apparatus

73658, G01H 1300

Patent

active

043443281

ABSTRACT:
A frequency detector for detecting the frequency of vibration of an apparatus is disclosed having a first vibration sensor for providing a first output having a first frequency response to the vibration, a second vibration sensor for providing a second output having a second frequency response to the vibration where the first and second frequency responses envelope the desired frequency of vibration for the apparatus, a difference sensor connected to the first and second vibration sensors for providing a third output dependent upon the difference between the first and second outputs, and a load which is responsive to the third output.

REFERENCES:
patent: 2424864 (1947-07-01), Treseder
patent: 3124961 (1964-03-01), Bedford
patent: 3146057 (1964-08-01), Rona
patent: 3403548 (1968-10-01), Petrik et al.
patent: 4041783 (1977-08-01), Shimauchi et al.
patent: 4257747 (1981-03-01), Goldman

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