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1. (WO2018182405) ELECTRICAL DISPLACEMENT-, LOAD- OR FORCE SENSOR

Pub. No.:    WO/2018/182405    International Application No.:    PCT/NL2018/050183
Publication Date: Fri Oct 05 01:59:59 CEST 2018 International Filing Date: Sat Mar 24 00:59:59 CET 2018
IPC: G01B 7/00
G01D 5/20
G01B 7/16
G01L 1/14
Applicants: TECHNISCHE UNIVERSITEIT DELFT
Inventors: VAN DE KAMP, Cornells
FRITSCHI, Michael
Title: ELECTRICAL DISPLACEMENT-, LOAD- OR FORCE SENSOR
Abstract:
Electrical displacement-, load- or force sensor com¬ prising a spring which is subjectable to a mechanical load or force and an inductive sensor element for measuring an elec¬ trical parameter that varies depending on said mechanical load or force on the spring, wherein the inductive sensor element is the spring and said spring is placed in series with an electrical circuit comprising in parallel a switching element and an RC circuit. The sensor can then be used to measure the load or force applied to the spring by arranging that the spring is energized through an electrical current flowing through the spring and through the current path with the switching element parallel to the RC circuit, and by subse¬ quently interrupting the current from flowing through the cur¬ rent path parallel to the RC circuit and forcing it to flow through the RC circuit. A voltage decay time of an electrical energy received by the RC circuit upon interruption of the current flowing through the current path parallel to the RC circuit is then measured and used as a measure for the load or force applied to the spring.