Fast response capacitive gauging system featuring steep slope filter discrimination circuit
US8405409B2 · kind B2 · utility
1Cited by
3References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 22, 2010 |
| Grant date | Mar 26, 2013 |
| Priority date | — |
| Expiry date | Oct 13, 2031 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB23K26/1464
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
The high speed, high accuracy capacitive gauging system employs an oscillator fed through steep slope filter that is discriminates between very small changes in capacitance even in the presence of electrical noise. During intervals when the probe tip is retracted, the oscillator frequency is calibrated to match the sweet spot in the center of the linear operative region of the steep slope filter. This calibrates the system to overcome the effects of varying temperature and humidity in the manufacturing environment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.