A system for imaging the contents of containers includes an imager arranged to
receive millimetre wave radiation from a reception volume through a receive antenna
wherein, in use, the container is moving relative to the receive antenna, the reception
volume is positioned such that the relative movement causes the reception volume
to move through the container; data from the antenna is recorded as the reception
volume moves through the container, and an image of the contents of the container
is built up from the recorded data. The system is particularly suitable for imaging
containers mounted on vehicles. The imager may advantageously be mounted in a portal,
allowing convenient and controllable relative positioning of the container, and
allowing the relative speed to be controlled or measured easily. The invention
allows 3D or pseudo 3D images to be produced to aid identification of container
contents. The invention also includes a method for imaging.
