Container defect detection apparatus
US4212205A · kind A · utility
11Cited by
2References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 12, 1979 |
| Grant date | Jul 15, 1980 |
| Priority date | — |
| Expiry date | Feb 12, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N29/045
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.