公开(公告)号：US10895504B2

公开(公告)日：2021-01-19

申请号：US16039163

申请日：2018-07-18

Applicant: HAMAMATSU PHOTONICS K.K.

Inventor： Takashi Yasuda ,  Yoichi Kawada ,  Kazuki Horita ,  Hironori Takahashi ,  Takayoshi Kuga ,  Atsushi Nakanishi ,  Kazutaka Tomari

IPC: G01J3/42 ,  G01J3/02 ,  G01N21/3586 ,  G01N21/552

Abstract: A measurement auxiliary member is placed on an arrangement surface of a prism. A measurement object is placed on an upper surface of the measurement auxiliary member. The measurement auxiliary member totally reflects the terahertz wave input from a lower surface by the upper surface and outputs the totally-reflected terahertz wave from the lower surface. A main pulse of a terahertz wave totally reflected by the upper surface of the measurement auxiliary member without multiply-reflected inside any optical element on an optical path of the terahertz wave, and a noise pulse of a terahertz wave multiply-reflected inside any optical element on the optical path and reflected on an interface between the prism and the measurement auxiliary member, are temporally separated from each other when detecting a correlation by a terahertz wave detection element.