DESIGN AND CONSTRUCTION OF A LOW COST VIBRATING SAMPLE MAGNETOMETER FOR B-H CURVE INFERENCE

摘要

Since the beginning of the twentieth century, many advancements have been applied towards the design of novel magnetic measuring devices. Examples of currently available devices are; gaussmeters, fluxmeters, fluxgate magnetometers, hysteresigraphs, nuclear magnetic resonance gaussmeters, superconducting quantum interference device magnetometer and vibrating sample magnetometers. Naturally, the aforementioned devices vary in both their accuracy and area of applicability. This work is confined to the design and construction of a vibrating sample magnetometer (VSM) for B-H curve measurements. Such device is known to be suitable for acquiring the magnetic properties of steel laminations to which special interest is directed in power engineering applications. The principle of operation of a VSM requires oscillating the tested sample while being exposed to a fixed or varying magnetic field. A sense coil positioned in proximity to this sample picks up sample magnetization. The presented work covers a review of the published literature related to the device under consideration. It also includes a detailed suggested VSM design approach that includes mechanical construction, field and pick-up coil configuration as well as electronic drive and amplification circuitry. Testing of the device is finally reported.