Shape Measurement of Canned Food to Verify Hermetic Sealing

Ryosuke SUGA  Shigenori TAKANO  Takenori YASUZUMI  Taichi IJUIN  Tetsuya TAKATOMI  Osamu HASHIMOTO  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E95-C   No.10   pp.1662-1665
Publication Date: 2012/10/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E95.C.1662
Print ISSN: 0916-8516
Type of Manuscript: BRIEF PAPER
Category: 
Keyword: 
shape measurement,  canned food,  collimated lens,  hermetic sealing,  

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Summary: 
A can swells due to gas produced from an inner food caused by poor hermetic sealing of the can. This paper presents a measurement for the bottom shape to detect a swelled can by using the millimeter-wave imaging. For get higher spatial resolution and an adjustable focal distance, two collimated beam lenses were applied to the measurement system. First, a configuration of the system was studied with the electrical field intensity and focal distance by using full wave electromagnetic simulation. Next, the bottom shapes of cans with different pressure were evaluated quantitatively using the system. A shape change of 0.5 mm was detected with pressure difference of 50 kPa, and it is reasonable considering actual dimension of the can shape. A potential of the proposed detection method was presented.