Brevet : EP0776467 - CAPTEUR DE FORCE OU D'ALLONGEMENT

Titre

CAPTEUR DE FORCE OU D'ALLONGEMENT

N° et date de publication de la demande

EP0776467 - 04/06/1997

Type de la demande

A1

N° et date de dépôt

EP95927652.8 - 09/08/1995

N° et date de priorité

DE4429050 - 16/08/1994

Famille de brevets

ES2147297T3 ; ATE192846T1 ; US5750904A ; JPH10504387A ; WO9605492A1 ; EP0776467A1

Abrégé

PCT No. PCT/DE95/01053 Sec. 371 Date Feb. 11, 1997 Sec. 102(e) Date Feb. 11, 1997 PCT Filed Aug. 9, 1995 PCT Pub. No. WO96/05492 PCT Pub. Date Feb. 22, 1996The force or extension sensor has a measuring capacitor (Mk) whose electrode structures (Es1, Es2), of comb-like design and interengaging, can be moved parallel to one another via two securing points (Bp1, Bp2) as a function of the force (F) to be measured or of the extension (+531 ) to be measured. The total capacitance of the measuring capacitor (Mk) is determined by parallel connection of individual electrode pairs. The variation in the total capacitance of the measuring capacitor (Mk) due to variation of the electrode separations (d1) gives information regarding the force (F) to be measured or the extension (+531 ) to be measured. A change in the electrode separations due to thermally induced extensions is compensated by providing, in the electrical series circuit connected to the measuring capacitor (Mk), an identically designed compensating capacitor (Kk) arranged orthogonally to the measuring capacitor (The), the securing points (Bp3, Bp4) of this compensating capacitor (Kk) are selected such that thermally induced variations in the electrode separation (d1, d3) of the measuring capacitor (Mk) and of the compensating capacitor (Kk) have opposite signs.