The terahertz camera has a fixed objective lens (2) and a plurality of
detectors (3) positioned at the focal plane of the objective lens (2).
Each of the detectors (3) is mounted on a movable support (10) so that
the antenna is capable of movement across the focal plane of the
objective lens (2) and is provided with a flexible waveguide (4) for
connecting the output of the detector (3) with signal processing means.
Each detector (3) is also provided with a retroreflector (6) which is
reflective at frequencies other than terahertz frequencies. During use of
the camera, the retroreflector (6) of each detector (3) is illuminated at
non-terahertz frequencies so that the spatial position of each detector
(3) and hence the spatial source of signals generated by the detector can
be accurately identified. The terahertz camera is particularly suited for
use in security installations and in chemical and food processing
industries.