| 摘要 |
PURPOSE:To vary a differentiation coefficient according to an object of measurement and to measure magnetism by connecting and disconnecting plural pickup ring parts to and from input coil parts individually through switches 4. CONSTITUTION:For the constitution of, for example, a coil of 0th order, the switches 4 are closed selectively so that the pickup ring parts 1 and corresponding input coil pats 2 are connected, thereby constituting four differentiating coils. For example, when the switches 4 are so adjusted as to form a closed loop by connecting the adjacent ring parts 1 in mutually opposite winding directions, two primary differentiating coils are constituted. Thus, an optional number of ring parts 1 are connected to the input coil pats 2 according to the combination of the switches 4 and coils where measurement magnetic flux is cross-linked are changed to measure the spatial variation quantity of a magnetic field and its differentiation quantity. |
