# Magnetic Field Meter Based on CMR-B-Scalar Sensor for Measurement of Microsecond Duration Magnetic Field Pulses

## TL;DR

This paper introduces a new magnetic field meter using a special sensor to accurately measure short, high-amplitude magnetic pulses with minimal interference.

## Contribution

A novel magnetic field measurement system using a CMR-based sensor for high-precision, microsecond-duration pulsed magnetic field measurements.

## Key findings

- The system successfully measured magnetic pulses up to 15 T with durations of 20–30 μs.
- Two versions of the measurement unit were developed for different sensor placement distances.
- The use of a bipolar pulsed voltage reduced parasitic effects in the probe circuit.

## Abstract

This study presents a system for precisely measuring pulsed magnetic fields with high amplitude and microsecond duration with minimal interference. The system comprises a probe with an advanced magnetic field sensor and a measurement unit for signal conversion, analysis, and digitization. The sensor uses a thin nanostructured manganite La-Sr-Mn-O film exhibiting colossal magnetoresistance, which enables precise magnetic field measurement independent of its orientation. Films with different compositions were optimized and tested in pulsed magnetic fields. The measurement unit includes a pulsed voltage generator, an ADC, a microcontroller, and an amplifier unit. Two versions of the measurement unit were developed: one with a separate amplifier unit configured for the sensor positioned more than 1 m away from the measurement unit, and the other with an integrated amplifier for the sensor positioned at a distance of less than 0.5 m. A bipolar pulsed voltage supplying the sensor minimized the parasitic effects of the electromotive force induced in the probe circuit. The data were transmitted via a fiber optic cable to a PC equipped with a special software for processing and recording. Tests with 20–30 μs pulses up to 15 T confirmed the effectiveness of the system for measuring high pulsed magnetic fields.