Progress in Superconductivity and Cryogenics (한국초전도ㆍ저온공학회논문지)

The Korean Society of Superconductivity and Cryogenics (한국초전도저온학회)
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Development of Contaminant Detection System using HTS SQUIDs

  • Ohtani, T. (National University Corporation, Toyohashi University of Technology) ;
  • Tanaka, S. (National University Corporation, Toyohashi University of Technology) ;
  • Narita, Y. (National University Corporation, Toyohashi University of Technology) ;
  • Ariyoshi, S. (National University Corporation, Toyohashi University of Technology) ;
  • Suzuki, S. (Advance Food Technology Co., Ltd.)
  • Received : 2015.11.24
  • Accepted : 2015.12.17
  • Published : 2015.12.31
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Abstract

In terms of food safety,mixture of contaminants in food is a serious problem for not only consumers but also manufacturers. In general, the target size of the metallic contaminant to be removed is 0.5 mm. However, it is a difficult task for manufacturers to achieve this target, because of lower system sensitivity. Therefore, we developed a food contaminant detection system based on high-Tc RF superconducting quantum interference devices (SQUIDs), which are highly sensitive magnetic sensors. This study aims to improve the signal to noise ratio (SNR) of the system and detect a 0.5 mm diameter steel ball. Using a real time digital signal processing technique along with analog band-pass filters, we improved the SNR of the system. Owing to the improved SNR, a steel ball with a diameter as small as 0.3 mm, with stand-off distance of 117 mm was successfully detected. These results suggest that the proposed system is a promising candidate for the detection of metallic contaminants in food products.

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References

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  1. Prototype of Multi-Channel High-Tc SQUID Metallic Contaminant Detector for Large Sized Packaged Food vol.E100.C, pp.3, 2017, https://doi.org/10.1587/transele.E100.C.269