公开(公告)号：US10345232B2

公开(公告)日：2019-07-09

申请号：US16065971

申请日：2016-12-21

Applicant: TOPCON CORPORATION

Inventor： Kaoru Kumagai ,  Shugo Akiyama ,  Issei Hanya ,  Peng Zhao ,  Masashi Funahashi ,  Yoshimitsu Nakajima ,  Yuji Shirane

IPC: G01N21/35 ,  G01N33/38 ,  G01N21/27 ,  G01N21/359

Abstract: A method of measuring a state of concrete includes emitting an irradiation light to the concrete, the irradiation light including a wavelength range of near infrared light related to concrete measurement; and receiving a reflection light of the irradiation light P reflected on the concrete. At least five wavelengths λ1 to λ5, λ6 to λ10, different from each other by PLS regression analysis within a wavelength range of 900 nm to 2500 nm of absorption spectrum, are determined, and a degree of neutralization of the concrete caused by calcium hydroxide and a concentration of chloride ion is estimated.