title: Note: Readout of a micromechanical magnetometer for the ITER fusion reactor.
abstract: We present readout instrumentation for a MEMS magnetometer, placed 30 m away from the MEMS element. This is particularly useful when sensing is performed in high-radiation environment, where the semiconductors in the readout cannot survive. High bandwidth transimpedance amplifiers are used to cancel the cable capacitances of several nanofarads. A frequency doubling readout scheme is used for crosstalk elimination. Signal-to-noise ratio in the range of 60 dB was achieved and with sub-percent nonlinearity. The presented instrument is intended for the steady-state magnetic field measurements in the ITER fusion reactor.
authors.affiliation: VTT Technical Research Centre of Finland, Tietotie 3, 02150 Espoo, Finland. henry.rimminen@vtt.fi
authors.forename: H
authors.initials: H
authors.lastname: Rimminen
authors.forename: J
authors.initials: J
authors.lastname: Kyynäräinen