Method and apparatus for inspecting communicating hole of a cast molded article
US6367327B2 · kind B2 · utility
0Cited by
7References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 7, 2001 |
| Grant date | Apr 9, 2002 |
| Priority date | — |
| Expiry date | Feb 7, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2291/269
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A transmitter of audible sound waves is disposed at one end of a communicating hole of a cast molded article such as a cylinder block, and a receiver of audible sound waves is disposed at the other end of the communicating hole. The quality of the communicating hole is determined by receiving audible sound waves from a transmitter which have passed through the communicating hole and computing and processing a frequency spectrum of the received audible sound waves based on a reference frequency spectrum.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.