EXTERNAL CIRCUIT FOR DISPLACEMENT SENSOR

• Main Authors: KAWAI HISASHI, SHIRATANI KAZUHIKO, KAWASAKI TAKASHI, MIZUTANI AKITOSHI
• Format: Patent
• Language: English
• Published: 18.03.2004
• Edition: 7
• Subjects: ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVEREDIN A SINGLE OTHER SUBCLASS; BASIC ELECTRONIC CIRCUITRY; ELECTRICITY; MEASURING; MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR; PHYSICS; PULSE TECHNIQUE; TARIFF METERING APPARATUS; TESTING

PROBLEM TO BE SOLVED: To provide an external circuit for displacement sensors for avoiding detection errors with respect to environmental changes. SOLUTION: The external circuit for displacement sensors is connected to a displacement sensor, having a second conductor AB that is arranged close to a first, single conductor L so that it can be displaced. The external circuit for displacement sensors comprises an oscillating means SOC for supplying AC across both the ends of the first conductor L; a first circuit row for generating a displacement level voltage VDETECTby rectifying and smoothing a voltage across both the ends of the first conductor L; a second circuit row for generating a constant voltage VDUMMYby rectifying and smoothing the output of the oscillation means OSC; and a differential amplification circuit DIF3, where the output of the first and second circuit rows is inputted. COPYRIGHT: (C)2004,JPO