| 摘要 |
<p>A sensor structure (20) for use with container inspection systems utilizes a continuous-wave (CW) microwave radar to measure the curvature or the vibration characteristics of a container wall (26) through a thick corrugated cardboard case top or on a single item container processing line. A radar antenna (32) directs RF energy toward cans moving along a conveyor (48). The antenna emits a beam which, over time, illuminates a narrow region along a line from one outer edge of the can to the opposing outer edge, as the can passes the antenna. During this time, a continuous measurement of the relative change in distance from the antenna to the top of the can (28) is generated and sampled for acquisition by a computer, and an estimate of the profile is made from changes in the distance measurement.</p> |
