公开(公告)号：US20190017929A1

公开(公告)日：2019-01-17

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: G01N21/359 ,  G01N33/38

CPC classification number: G01N21/359 ,  G01N21/274 ,  G01N33/383

Abstract: To provide a method of measuring a state of concrete capable of easily determining or measuring deterioration of the concrete without using a spectroscopy while maintaining the estimation accuracy. The method of the present disclosure emits an irradiation light to the concrete, the irradiation light including a wavelength range of near infrared light related to concrete measurement; and receives a reflection light of the irradiation light P reflected on the concrete. The method determines 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, and estimates a degree of neutralization of the concrete caused by calcium hydroxide and a concentration of chloride ion.