A SMART CAPACITIVE ABSOLUTE ANGULAR-POSITION SENSOR

被引：29

作者：

DEJONG, GW ^{[1
]}

MEIJER, GCM ^{[1
]}

VANDERLINGEN, K ^{[1
]}

SPRONCK, JW ^{[1
]}

AALSMA, AMM ^{[1
]}

BERTELS, DAJM ^{[1
]}

机构：

[1] DELFT UNIV TECHNOL,DEPT MECH ENGN,2628 CD DELFT,NETHERLANDS

来源：

SENSORS AND ACTUATORS A-PHYSICAL | 1994年 / 41卷 / 1-3期

关键词：

D O I：

10.1016/0924-4247(94)80113-4

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

This paper describes a novel low-cost smart accurate capacitive absolute angular-position sensor with high accuracy and high resolution (18 bits r.m.s.). One of the novelties of this sensor is that, for each measurement, it uses all 24 segment electrodes along the circumference, each of them ranging from 0 to 0.3 pF. The capacitance values between these electrodes have a lot of redundancy with respect to the position to be measured. The electronic processing uses this redundancy to compensate for mechanical errors in the sensor in order to obtain an accurate measurement and to reduce the mechanical demands on the sensor. This novel approach can also be applied directly to capacitive absolute linear-position sensors. A simple and cheap oscillator is used to measure the various sensor capacitances. The oscillator converts the analog capacitance information into the time domain and is directly digitized by a microcontroller, eliminating the need for an expensive AD converter.

引用

页码：212 / 216

页数：5