Integrated instrumental chain for magnetic pulse measurement in strong static field environment

Abstract

This paper describes an integrated analogue instrumental chain dedicated to measuring magnetic pulses with an amplitude of a few tens or hundreds of microteslas, superimposed to a strong static magnetic field, i.e. 1.5 T. The system features a silicon Hall sensor with nestedchopping-like biasing circuitry, DC Hall voltage compensation, amplifying and multistage filtering. Low-noise performances are achieved by applying 100 kHz spinning current to the Hall device and chopping at 200 kHz to the signal conditioning blocs downstream. The microsystem achieves 20 lT resolution over a 1.6 kHz bandwidth extending from 5 Hz to 1.6 kHz under 1.5 T static field.

50 Hz pulse magnetic field measurements - metrological possibilities of magnetic field meters

“…Most commonly we are dealing with constant monochromatic magnetic field and also the available measurement equipment is dedicated (and calibrated) to measure CW magnetic field. Issues related to magnetic fields has been very widely described in various publications [1,2,3,4,5], but focusing on measurement methods or specialized sensors solutions. Authors also presented some aspect related to pulse electromagnetic fields [6,7,8] and concerning electromagnetic field (EMF) from machines used in the industry [9,10,11,12] or biomedical research [13], concerning measurements and measuring devices used for the purpose of environmental protection and labour safety, and showed, that pulse EMF measurements can be encumbered with significant errors.…”