ASC 2006

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Visa Requirements●Conference Venue /Paper Number: 3EC02

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Start Time:

10:30am

Session Type:

Contributed Oral

Wednesday, August 30, 2006
Session Title:

SQUID Applications - I

Session Chairs:

Hideo Itozaki, Osaka University & Harold Weinstock, Air Force Office of
Scientific Research

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❍ Exhibitor❍ Technical● Related Conferences /❍ The❍ SocialWebsites❍❍ ●❍❍High Tc SQUID based Magnetic Contaminant detection System for Beverage or minced flesh
S. Tanaka, H. Fujita, Y. Hatsukade, Toyohashi University of Technology; T. Nagaishi, K. Nishi, H.
Ota, Sumitomo Electric Hightechs Co., Ltd.; S. Suzuki, T. Otani, Advance Food Technology Co., Ltd.
A computer controlled contaminant detection system based on high-Tc Superconducting Quantum
Interference Device (SQUID) for a beverage or minced flesh has been designed and constructed.
There is a possibility that individuals ingest contaminants that have been accidentally mixed with foodbecause processed foods have become very common. Therefore, a detection method of small
contaminants in food is required. Last year, we developed and started to sell the High-Tc SQUID based
detection system with a belt conveyer, which is for food such as a cheese or a meat. However thesystem with a conveyer can not apply to a liquid material such as juice or minced flesh in process.
There is a strong demand for detection of magnetic contaminants in minced flesh or juice with pulp
because a strainer cannot be applied to such a pulpy liquid. Therefore, we developed the detection
system based on high-Tc SQUID for a beverage. The outer dimensions of the system are 800 mm
length x 530 mm width x 1560 mm height. A straight tube with a dimension of 25 x 70 mm, in which abeverage flows is penetrating the system. This system employed a newly developed double-layered
cylindrical magnetic shield. The distribution of the magnetic field in the magnetic shield was carefully
simulated by FEM (Maxwell, Ansoft Corporation); the gap between each shield layer was optimized
before fabrication. Then the shielding factor of 1/970 in z- component, which is good enough to operate
the system in a factory was achieved. The two identical SQUIDs were employed so that they can keep
the sensitivity over the full width of the tube. As a result, we could successfully measure small ironparticles in the order of hundreds micron. This detection level was hard to be achieved by aconventional X-ray detection or an eddy current method. We believe that this system is the fist practical
SQUID based metallic contaminant detector for a beverage.

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