Title:
A PLANE CAPACITIVE SENSOR AND A METHOD FOR DETECTING ENVIRONMENTAL VARIATION OF VEHICLE WINDSCREEN
Document Type and Number:
WIPO Patent Application WO/2007/140658
Kind Code:
A1
Abstract:
A plane capacitive sensor includes a plane capacitor (1), a plane capacitor compensator (2)
for eliminating disturbing signals, and a sensor detection circuit. The sensor
adopts two plane capacitors, and one capacitor serves as a detecting capacitor, and
another serves as a compensating capacitor. The fixing position and the shape of
the compensating capacitor are changeable so as to make the capacitor become insensitive
to the rain on the outside surface of windscreen, but sensitive to temperature
shift and electromagnetic disturbance. When suffered temperature shift or
electromagnetic disturbance, the measurements of the detecting capacitor and
the compensating capacitor are varied simultaneously and their variation magnitudes
are equal with each other approximatively. When suffered variation of the rain,
the measurement of the detecting capacitor is varied and the measurement of the
compensating capacitor keeps constant substantially.
Inventors:
SUN TENGCHEN (CN)
Application Number:
PCT/CN2006/001973
Publication Date:
December 13, 2007
Filing Date:
August 04, 2006
Export Citation:
Assignee:
SUN TENGCHEN (CN)
International Classes:
G01N27/22; B60S1/04
Foreign References:
| JP2000075052A | 2000-03-14 | |||
| US6373263B1 | 2002-04-16 | |||
| JPH09127260A | 1997-05-16 | |||
| CN1491840A | 2004-04-28 | |||
| US5682788A | 1997-11-04 |
Attorney, Agent or Firm:
BEIJING GOLDENG BRIDGE IP CO., LTD. (Horizon International TowerNo.6 Zhichun Road,Haidian District, Beijing 8, CN)
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