Title:
FAST RESPONSE CAPACITIVE GAUGING SYSTEM FEATURING STEEP SLOPE FILTER DISCRIMINATION CIRCUIT
Document Type and Number:
WIPO Patent Application WO/2011/037981
Kind Code:
A3
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.
Inventors:
HERMANN GERALD F (US)
BUCKLEY DANIEL R (US)
MILLER CHRISTOPHER R D (US)
JEFFERIES KEITH A (US)
BUCKLEY DANIEL R (US)
MILLER CHRISTOPHER R D (US)
JEFFERIES KEITH A (US)
Application Number:
PCT/US2010/049795
Publication Date:
October 20, 2011
Filing Date:
September 22, 2010
Export Citation:
Assignee:
LASER MECHANISMS INC (US)
HERMANN GERALD F (US)
BUCKLEY DANIEL R (US)
MILLER CHRISTOPHER R D (US)
JEFFERIES KEITH A (US)
HERMANN GERALD F (US)
BUCKLEY DANIEL R (US)
MILLER CHRISTOPHER R D (US)
JEFFERIES KEITH A (US)
International Classes:
G01B7/14; B23K26/42; G01B7/00
Foreign References:
| US20010024126A1 | 2001-09-27 | |||
| US5942975A | 1999-08-24 | |||
| JPH07195188A | 1995-08-01 | |||
| US6304091B1 | 2001-10-16 | |||
| US5428280A | 1995-06-27 | |||
| US20030102294A1 | 2003-06-05 |
Other References:
See also references of EP 2480859A4
Attorney, Agent or Firm:
EUSEBI, Christopher, A. et al. (Dickey & Pierce P.L.C.,P.O. Box 82, Bloomfield Hills MI, US)
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