Eddy current sensor for detecting displacements - has cylindrical field coil, electrically conducting metal body connected to measurement object, cylindrical measurement coils on either side of field coil

摘要

An eddy current sensor for detecting displacements contains a pref. cylindrical field coil (2) generating a magnetic field and an electrically conducting metal body (5,6) connected to the measurement object. The metal body has a homogeneous or divided cross-section perpendicular to the coil axis and sufficiently effective for eddy currents. Two pref. cylindrical measurement coils (3) are arranged opposite each other and only slightly outside the field coil with their axes in the same plane as that of the field coil. The width of the metal body is less than the separation of the measurement coil axes. Its longitudinal axis is at an acute angle to the displacement direction, which is perpendicular to the measurement coil plane. USE/ADVANTAGE - Esp. for large displacement measurement in industrial measurement and automation. The robust, reliable displacement sensor causes no reaction effects.