Automated measurement system employing eddy currents to adjust probe position and determine metal hardness
US4849693A · kind A · utility
19Cited by
2References
26Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 29, 1988 |
| Grant date | Jul 18, 1989 |
| Priority date | — |
| Expiry date | Feb 29, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/9053
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A system for measuring the hardness of cartridge cases employs an eddy current probe for inducing and sensing eddy currents in each cartridge case. A first component of the sensed signal is utilized in a closed loop system for accurately positioning the probe relative to the cartridge case both in the lift off direction and in the tangential direction, and a second component of the sensed signal is employed as a measure of the hardness. The positioning and measurement are carried out under closed loop microprocessor control facilitating hardness testing on a production line basis.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.