Title :
Modeling of the front end of a new capacitive finger-type angular-position sensor
Author_Institution :
Inst. for Electr. Meas. & Meas. Signal Processing, Tech. Univ. Graz, Austria
fDate :
2/1/2001 12:00:00 AM
Abstract :
A robust capacitive finger-type angular-position and angular-speed sensor for automotive and metrology applications is presented. The advantages of the capacitive sensor principle are simplicity, high response speed and resolution (±0.04°), compact sensor outlines, and insensitivity to dirt and condensation. Additionally the presented finger-type geometry allows easy mounting and replacement. The paper describes the working principle, the design and the layout of a prototype sensor. It models the front-end topology and derives the transfer function of the input circuit. The required relationships for computing the angular rotor position are presented, and measurement results obtained from a prototype sensor are discussed
Keywords :
angular measurement; angular velocity measurement; automotive electronics; capacitive sensors; position measurement; signal processing equipment; transfer functions; angular rotor position; angular-speed sensor; automotive applications; capacitive finger-type angular-position sensor; capacitive sensor principle; carrier frequency system; compact sensor outlines; condensation insensitivity; dirt insensitivity; finger-type geometry; front end modeling; front-end topology; input circuit transfer function; measurement results; metrology applications; ratiometric measurement algorithm; resolution; response speed; sensor design; sensor layout; working principle; Automotive engineering; Capacitive sensors; Circuit topology; Geometry; Metrology; Position measurement; Prototypes; Robustness; Sensor phenomena and characterization; Transfer functions;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
