Patent · US Expired

Testable membrane sensor with two full bridges

US6289738A · kind A · utility

8Cited by

4References

5Claims

0Family size

Assignee

Robert Bosch GmbH · DE

Inventors

Erich Zabler · Blankenloch, DE
Herbert Keller · Pulheim, DE
Joerg Wolf · Karlsruhe, DE

Key dates

Filing date	Feb 21, 1997
Grant date	Sep 18, 2001
Priority date	—
Expiry date	Feb 21, 2017

Classification

Technology area (CPC G)Physics
CPC primaryG01R17/105
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

A sensor is proposed that has a measuring diaphragm (2), with at least one resistor measurement bridge (7, 8); a deflection of the measuring diaphragm (2) causes mistuning of the respective measurement bridge (7, 8), and the resultant change in the bridge diagonal voltage can be evaluated. The sensor (1) has one resistor measurement bridge (7, 8) on each half (3, 4) of the measuring diaphragm (2), and in each of the resistor measurement bridges (7, 8), two opposed bridge branches (R1, R4) are changed in their resistance values (.DELTA.R) by radial compressive offset, and the respectively other bridge branches (R2, R3) are altered in their resistances by radial or tangential elongation.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.