METHOD OF MEASURING A POSITION AND A POSITION MEASURING DEVICE

In the method of measurement of the absolute position of the linear- motion element being monitored by measuring voltage on the secondary coils, at least three voltage states are created on each of the secondary coils in dependence on the specific position of the linear-motion element, while forming a unique combination of the voltage states of all the secondary coils for every measured position of the linear-motion element, which allows for reducing the number of the secondary coils needed to determine the linear-motion element position. The device for implementing the method of measurement of the absolute position of the linear-motion element, especially the nuclear reactor control rod, consists of a position sensor (1) and a coding element (2) set in parallel or coaxially to it, and of magnetic parts (2.1) and non-magnetic parts (2.2). The position sensor (1) includes a power-supplied primary winding (1.2) and a multi-tap secondary winding (1.3) magnetically-coupled with it to read the induced voltage corresponding to the certain position of the linear- motion element. The primary winding (1.2) is wound to form a group of sections of the primary winding (1.2) mutually electromagnetically- separated from each other, and a multi-tap secondary winding (1.3) consists of a set of separate secondary coils arranged in a line and is magnetically-coupled with this primary winding (1.2). Each secondary coil consists of at least two winding parts and is designed in a magnetically-coupled way with at least two electromagnetic- separated sections of the primary winding.