Microcontroller-based instrument for measuring magnetic susceptibility using mutual inductance bridge

Authors

Leni S. Villanueva ⋅ PH Institute of Mathematical Sciences and Physics, University of the Philippines Los Baños
Marvin U. Herrera ⋅ PH Institute of Mathematical Sciences and Physics, University of the Philippines Los Baños
Nelio C. Altoveros ⋅ PH Institute of Mathematical Sciences and Physics, University of the Philippines Los Baños

Abstract

A microcontroller-based instrument for measurement of magnetic susceptibility was designed and tested. The system used Mutual Inductance Bridge (MIB) as the sensor. The MIB was designed as a three-coil system. The change in voltage upon placement of the sample in one of the two secondary coils was monitored and converted to digital data using ADC of the ZiLOG Z8F6401 microcontroller.
The microcontroller system was tested and the precision of the readings was determined. For samples that are paramagnetic, the voltage reading of the instrument is higher than the reading without a sample and therefore gives positive values. However on materials that are known to be diamagnetic, the voltage reading of the instrument is lower than the voltage reading without the sample giving a negative reading. Various aluminum samples of increasing sizes were tested. It was observed that the magnetic susceptibility obtained by the instrument increases as the size of the sample increases.

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Issue

2007: Proceedings of the 25th Samahang Pisika ng Pilipinas Physics Congress

Article ID

SPP-2007-PA-20

Section

Poster Session PA

Published

2007-10-24

How to Cite

[1]

LS Villanueva, MU Herrera, and NC Altoveros, Microcontroller-based instrument for measuring magnetic susceptibility using mutual inductance bridge, Proceedings of the Samahang Pisika ng Pilipinas 25, SPP-2007-PA-20 (2007). URL: https://proceedings.spp-online.org/article/view/SPP-2007-PA-20.