公开(公告)号：US11879722B2

公开(公告)日：2024-01-23

申请号：US17270856

申请日：2020-02-27

Applicant: IIDA Co., Ltd. ,  THE UNIVERSITY OF TOKYO

Inventor： Shigeo Miyake ,  Yusuke Kajihara ,  Shuichi Nowatari ,  Seiichiro Iwasaki ,  Junya Nowatari

IPC: G01B15/06

CPC classification number: G01B15/06

Abstract: An objective of the present invention is to provide a method, or the like, for estimating the convergence of dimensional changes in a molded article over time, by utilizing the polarization intensity of terahertz waves. The present invention provides a method for estimating the convergence of changes in the dimensions of a molded article over time, the method comprising: irradiating a molded article with terahertz waves at multiple positions thereon, wherein the molded article is irradiated with the terahertz waves at each position thereon in multiple orientations about the optical axis; measuring polarization intensities of the terahertz waves transmitted through or reflected from the molded article; and determining whether the polarization intensities at the multiple positions are in a given relationship with each other.