MAGNETOSTRICTION TYPE STRESS SENSOR AND ITS APPLICATION.

摘要

A flexible sheet (70) has a wiring patterm (50) on its one side and a wiring pattern (60) on the other. The wiring patterns (50 and 60) include linear parts (50C and 60C), and semicircular parts (50A and 60A). The linear parts (50C) are just above the linear parts (60C). The semicircular parts (60A) are interposed between the two adjacent semicircular parts (50A). One end of each of the wiring patterns (50 and 60) are connected to a detecting circuit (75) which senses variation of inductance. The other ends of the wiring patterns (50 and 60) are connected to each other via a through hole (70A). The sheet (70) is placed so that the linear parts (50C and 60C) are perpendicular to the direction of the stress which is produced in an object (80). The sheet (70) and the wiring patterns (50 and 60) constitute a detecting coil (71). An alternating excitating current is applied to the detection coil (71). When a stress is produced in the object (80), the magnetic permeability changes, and consequently the inductance of the detecting coil changes.