PRESERVATIVE DETECTING METHOD AND PRESERVATIVE DETECTING APPARATUS

WIPO Patent Application WO/2007/018056

A1

A preservative detecting method and apparatus for detecting a preservative composed of a nonmagnetic material and added to a packaged food product stably and accurately. A preservative detecting apparatus for detecting a preservative composed of a non magnetic material and added to a packaged food product (6) comprises a measuring instrument (30) for measuring the impedance characteristic of the packaged food product (6) and a control unit (4) for determining an allowable range of the impedance characteristic of the packaged food product according to the measured value of the impedance characteristic of a packaged food product containing a preservative the presence of which is known, storing the determined allowable range, and comparing the measured value of the impedance characteristic of the packaged food product (6) with the allowable range so as to detect the preservative in the packaged food product (6). As the impedance characteristic, one of the phase angle of the impedance value Z, the resistance value Rs in an equivalent series circuit mode, and the capacitance value Cs in the equivalent series circuit mode is selected and measured, thereby detecting a preservative.

MOCHIZUKI KEIZOU (JP)
HARA HIDEJIRO (JP)
NOMURA YOSHITAKA (JP)
SAITO YOSHIHITO (JP)

PCT/JP2006/315002

February 15, 2007

July 28, 2006

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FREUND CORP (JP)
MOCHIZUKI KEIZOU (JP)
HARA HIDEJIRO (JP)
NOMURA YOSHITAKA (JP)
SAITO YOSHIHITO (JP)

G01V3/08; G01N22/00; G01N22/02; G01N27/02

JP2005156167A	2005-06-16
JP2001066273A	2001-03-16

TANAI, Sumio et al. (Yaesu Chuo-ku, Tokyo 53, JP)

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