Latest bibliographic data on file with the International Bureau
|
| Pub. No.: | | WO/1982/003694 | |
International Application No.: | | PCT/US1982/000511 |
| Publication Date: | 28.10.1982 |
International Filing Date: | 22.04.1982 |
|
| IPC: |
G01D 5/241 (2006.01), G01L 9/12 (2006.01), G01P 15/125 (2006.01), G01R 27/26 (2006.01) |
| Applicant: | SETRA SYSTEMS, INC. [US/US]; One Strathmore Road, Natick, MA 01760 (US). |
| Inventor: | BRIEFER, Dennis, K.; (US). |
| Agent: | LAPPIN, Mark, G. @; Kenway & Jenney, 60 State Street, Boston, MA 02109 (US). |
| Priority Data: | |
| Title: |
LINEAR CAPACITIVE SENSOR SYSTEM
|
| Abstract: |
A capacitive sensor system (10) including a sensor (12) with two fixed plate elements having opposed planar, electrically conductive surfaces serving as electrodes (14, 16). The sensor (12) further includes a movable, electrically conductive diaphragm (18) positioned between the electrodes. At least one diode detector network (N¿1? or N¿2?) is coupled across the electrodes. The diode detector networks each include a pair of oppositely directed series connected diodes (D¿1?, D¿2?, D¿3?, D¿4?) with the junction between the diodes of each network being coupled to the diaphragm (18). In embodiments having only one diode detector network, the junction between the two diodes may be directly or capacitively coupled to the diaphragm. In embodiments having two such diode detector networks, the diodes of the second network are oppositely directed with respect to the corresponding diodes in the first network, and the junctions between the diodes in the second network are capacitively coupled to the diaphragm while the junctions between the diodes in the first diode network may be either directly or capacitively coupled to the diaphragm. The system further includes a coupler (C) for coupling a constant amplitude a.c. signal (20) across the electrodes (14, 16) of the sensor (12). The net d.c. voltage across the diodes (D¿1?, D¿2?, D¿3?, D¿4?) of the diode detector networks (N¿1? or N¿2?) is representative of the position of the diaphragm (18) between the two sensor electrodes (14, 16). |
| Designated States: |
CH, DE, GB, JP.
European Patent Office (EPO) (AT, BE, CH, DE, FR, GB, LU, NL, SE).
|
