INDUCTION TYPE CONTINUOUS DISPLACEMENT SENSOR

PURPOSE:To improve measuring accuracy, by enclosing both ends of primary and secondary coils by shield rings formed by a highly conductive conductor or a high permeability magnetic material. CONSTITUTION:A primary coil 2 and a secondary coil 3 are provided at adjacent positions in a protecting pipe 1. Shield rings 5 and 5', which are formed by a high permeability magnetic material, are provided at upper and lower ends of the primary and secondary coils 2 and 3. In this constitution, the primary and secondary coils 2 and 3 at the end parts 4 and 4' are not made sensitive even though a liquid level G' of a liquid metal G located at the outer surface is changed. Measurement can be performed only by the part where linearity is excellent.