DEVICE MEASURING COERCIVE FORCE OF MAGNETIC MATERIALS Russian patent published in 2002 - IPC

FIELD: non-destructive test of materials, equipment for magnetic measurements, inspection of quality of metal structures and their parts, parts of machines, parameters of permanent magnets. SUBSTANCE: device incorporates source of magnetization current, first switch and electromagnet with field transducer connected in series, second switch and analog-to-digital converter connected in series, first and second comparators, reference voltage source, current generator, controllable power amplifier, control unit and indicator connected properly. Device is supplemented with third switch, current-to-voltage converter and first amplifier connected in series, second amplifier, network with controllable time constant τ and third amplifier connected in series, fourth amplifier, third comparator and delay line also connected in series. These three groups of components are placed in proper manner in circuit of device. EFFECT: raised accuracy and authenticity of measurement results, speed of response, reduced energy consumption which allows dimensions and mass of device to be diminished markedly. 1 dwg