Container defect detection apparatus

Details Container defect detection apparatus Container defect detection apparatus

1979-02-12

1980-07-15

Ciarlante, Anthony V.

Measuring and testing

Vibration

Resonance, frequency, or amplitude study

73 52, G01N 2904

Patent

active

042122058

ABSTRACT:
An apparatus for detecting defects in empty containers, such as dents in cans, is disclosed. The containers are magnetically struck, causing them to ring at their natural frequencies. A microphone senses this resonance; a bandpass filter filters out the known frequencies generated by an acceptable container. The energy associated with other frequencies is examined to detect defects in the containers. A circuit for reducing the effects of background acoustic noise and a circuit for sensing the amount of energy imparted to the container when it is struck are also disclosed.

REFERENCES:
patent: 3438493 (1969-04-01), Goble
patent: 3802252 (1974-04-01), Hayward et al.

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