Patent ID: 8259378

Claim:
Scanning apparatus operable in the microwave, mm-wave sub mm wave (TeraHerz) and infrared ranges and comprising a support structure, a radiation detector or receiver, a first disc or mirror having a first reflective surface, the first disc or mirror mounted in the support structure for rotation relative to the support structure about a first axis, wherein the first reflective surface has an axis of rotational symmetry tilted at an angle relative to the first axis, a second disc or mirror having a second reflective surface, the second disc or mirror mounted in the support structure for rotation relative to the support structure about a second axis, wherein the second reflective surface has an axis of rotational symmetry tilted at an angle relative to the second axis, a driving means to drive the first and second discs or mirrors in respective opposite senses, wherein the first and second discs or mirrors are adapted such that radiation from a scene being scanned can reach the first reflective surface of the first disc or mirror to be reflected thereby as a first reflected radiation onto the second reflective surface of the second disc or mirror; the second reflective surface, in turn, reflecting the first reflected radiation as a second reflected radiation onto the radiation detector or receiver for processing the second reflected radiation.