CPC G01N 21/3581 (2013.01) [G01B 11/303 (2013.01)] | 10 Claims |
1. An imaging device comprising:
an area light source including an emission surface from which a sub-terahertz wave is emitted to a measurement target; and
a detector including an image sensor that receives a reflected wave generated by the measurement target reflecting the sub-terahertz wave emitted from the emission surface,
wherein the area light source includes:
at least one point light source that emits a sub-terahertz wave; and
a reflector that diffusely reflects the sub-terahertz wave emitted from the at least one point light source, to generate a sub-terahertz wave to be emitted from the emission surface, the reflector including a reflection surface that is a bumpy surface which is of a shape in which a plurality of protruding portions having mutually different shapes and a plurality of recessed portions having mutually different shapes are randomly arranged, includes two or more frequency components in a spatial frequency range and whose roughness curve element mean length RSm is at least 0.3 mm.
|