| 摘要 |
PROBLEM TO BE SOLVED: To provide a terahertz spectroscopic measuring device for inspecting objects such as postal articles, envelopes, and packages that are not open, and a method for the same.SOLUTION: Circular dichroism, that is an absorption difference between right and left circularly polarized light beams, and optical activity, that is a difference between refractive indexes, are thought to occur only in a sample having chirality such as a medicine, but not in envelopes or package materials. When circular dichroism or optical activity are measured by using a terahertz spectroscopic measuring method, an unneeded signal derived from non-objective material having no chirality is not observed, and only a signal derived from the sample having chirality can be measured. Thus, the use of the method can improve reliability and sensitivity in inspection. |
