| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method of non-contact determination of the internal pressure of a filled and sealed can, which can be conducted simply and in a manner unlikely to cause erroneous determination. <P>SOLUTION: A method of non-contact determination of the internal pressure of a filled and sealed can comprises: a step of setting at least a substantial center point of the bottom face of the can and a reference point at a predetermined distance away from the substantial center point toward circumferential side as measurement points, irradiating a millimeter wave with a frequency of 18 to 94 GHz and an irradiation range diameter of 20 mm or less toward the respective measurement points, and measuring a reflection wave at the respective measurement points; and a step of identifying the displacement amount at the substantial center point of the can from the phases of the reflection wave at the respective measurement points and determining whether the internal pressure of the can is acceptable based on the obtained displacement amount. <P>COPYRIGHT: (C)2013,JPO&INPIT |
