Topcon Corporation

Yuji Shirane

Shugo Akiyama

Issei Hanya

Yoshimitsu Nakajima

Kaoru Kumagai

Ryosuke Tomizawa

Naoto Kasori

Peng Zhao

Masashi Funahashi

Satoshi Suenaga

A spectral curve acquiring device comprising: a light receiving optical system () for irradiating an irradiating light, a light receiving optical system () for dispersing and receiving a reflected irradiating light reflected by an object to be measured (), a distance meter () for measuring a distance to the object to be measured, a storage module () for storing a plurality of reference spectral curves prepared based on a light receiving intensity for each wavelength at the time of measuring a white reference plate with different distances, and a control arithmetic module (), wherein the control arithmetic module obtains a light receiving intensity of the dispersed reflected irradiating light for each wavelength based on the reference spectral curve corresponding to a distance to be measured, corrects a measurement spectral curve prepared based on the light receiving intensity, and prepares a spectral reflectance curve.

Spectral curve acquiring device, concrete measuring instrument, spectral curve acquiring method and concrete measuring method

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 &#x3bb;to &#x3bb;to &#x3bb;, 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.

Method of measuring state of concrete

Growing community of inventors

Tokyo, Japan

Yuji Shirane