Measurement of metallic contaminants in food with a high-Tc SQUID
We have proposed and demonstrated a high-Tc SQUID system for detecting metallic contaminants in foodstuffs. There is a demand for the development of systems for detecting not only magnetic materials but also non-magnetic materials such as Cu and aluminium in foodstuffs to ensure food safety. The...
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| Main Authors: | , , , , , , |
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| Format: | Article |
| Published: |
2004
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| Subjects: | |
| Online Access: | http://eprints.um.edu.my/7465/ http://iopscience.iop.org/0953-2048/17/4/009/pdf/0953-2048_17_4_009.pdf |
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| Summary: | We have proposed and demonstrated a high-Tc
SQUID system for detecting
metallic contaminants in foodstuffs. There is a demand for the development
of systems for detecting not only magnetic materials but also non-magnetic
materials such as Cu and aluminium in foodstuffs to ensure food safety. The
system consists of a SQUID magnetometer, an excitation coil and a
permanent magnet. For a non-magnetic sample, an AC magnetic field is
applied during detection to induce an eddy current in the sample. For a
magnetizable sample, a strong magnetic field is applied to the sample prior
to the detection attempt. We were able to detect a stainless steel ball with a
diameter of 0.1 mm and a Cu ball less than 1 mm in diameter, for example. |
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