JPS6472002A - Electrostatic capacity strain gauge - Google Patents

Abstract

PURPOSE:To constitute a miniaturized electrostatic capacitor which follows up the large quantity of expansion and contraction of a body to be measured and has resistance to high temperature and to measure large strain in high- temperature environment by installing thin and long electrodes which follow well up the expansion and contraction of the bodies to be measured on the bodies to be measured at short measurement intervals. CONSTITUTION:Counter electrodes 1 and 2 which are electric good conductors constituting the electric capacitor are connected by lead wires 3 respectively and also connected to a measuring instrument which measures the electric capacitor by two shield wires. Then they are fixed at a constant interval with a ceramic adhesive 4-1 in the hollow in a metallic frame 5 spot-welded to a body 6 to be measured with a ceramic adhesive 4-2 while insulated electrically. In this state, when the body 6 to be measured expands or contracts horizontally by being applied with force, the metallic frame 5 also expands or contracts by the same quantity. The adjacent electrodes shift in relative position accordingly to vary the electric capacity, and the quantity of the expansion or contraction of the object body is measured electrically.