Chatter detection in thickness measuring gauges and the like

Details Chatter detection in thickness measuring gauges and the like Chatter detection in thickness measuring gauges and the like

1980-06-06

1981-11-17

Smith, Alfred E.

Radiant energy

Inspection of solids or liquids by charged particles

Including a radioactive source

250359, G01N 2300

Patent

active

043013660

ABSTRACT:
Process and apparatus for measuring variations in a stream of material, such as thickness in a strip from a mill. A radiation source and detector are positioned at a gauging station. The stream of material moves past the station providing an electrical signal varying as a function of material at the station which signal includes a lower frequency component, a higher frequency cyclical component, and a higher frequency noise component. A circuit for providing a thickness output varying as a function of the lower frequency component of the signal, and a circuit providing an output indicating chatter varying as a function of the higher frequency cyclical component. Digital and analog versions are disclosed.

REFERENCES:
patent: 3257559 (1966-06-01), McMullen
patent: 3479511 (1969-11-01), Clerc
patent: 3766386 (1973-10-01), Sivilotti et al.
patent: 3868510 (1975-02-01), Murata et al.
patent: 3955086 (1976-05-01), Tsujii et al.

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