Patent · US Expired

Evaluating circuit for linearizing the output of differential-choke displacement transmitter

US5202628A · kind A · utility

4Cited by

1References

6Claims

0Family size

Assignee

Robert Bosch GmbH · DE

Inventors

Johannes Locher · Stuttgart, DE
Werner Fischer · Heimsheim, DE
Joerg Barth · Mühlacker, DE

Key dates

Filing date	Nov 27, 1991
Grant date	Apr 13, 1993
Priority date	—
Expiry date	Nov 27, 2011

Classification

Technology area (CPC G)Physics
CPC primaryG01D5/2208
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

An evaluating circuit for linearizing the output signal of a differential-choke displacement transmitter has two inductive coils each supplied with an alternating voltage with constant frequency produced by an oscillator, wherein the amplitude is adjustable and the second alternating voltage is phase-displaced relative to the first alternating voltage by 180.degree.. The signal which is picked up between the inductive coils at the input is compared, after a phase-controlled rectification, with a reference value and the deviation is integrated. With the aid of the integrated signal the regulation of the amplitude adjustment of the alternating voltages is performed. As a result a measuring signal without residual ripple is obtained, which changes proportionally to an adjustment path for example of an adjustment rod.

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