Apparatus and method for detecting scattering material by terahertz wave transmission while eliminating unscattered component transmitted in a rectilinear manner

摘要

There is disclosed an apparatus comprising: a terahertz wave generation device (12) which generates a terahertz wave (2); a terahertz wave irradiation device (14) which irradiates an object (1) to be inspected with the terahertz wave; and a scattered intensity detection device (20) comprising a shielding member (27) which blocks the rectilinear, unscattered wave component (3) of the terahertz wave which has passed through the object to be inspected. Thus the intensity of the scattered wave component (4) is detected, and a scattering material such as powder or foam contained in an envelope, a capsule, a container or the like forming the object (1) is detected in a non-destructive manner without unsealing the envelope or the like.