US 12,345,663 B2
Reinforcement bar corrosion evaluation device, reinforcement bar corrosion evaluation method, and computer program
Hideaki Morita, Tokyo (JP); Yoko Taki, Tokyo (JP); Yukio Ozawa, Tokyo (JP); and Masahiko Ota, Tokyo (JP)
Assigned to GEO SEARCH CO., LTD., Tokyo (JP)
Appl. No. 17/778,092
Filed by GEO SEARCH CO., LTD., Tokyo (JP)
PCT Filed Jun. 18, 2020, PCT No. PCT/JP2020/023929
§ 371(c)(1), (2) Date May 19, 2022,
PCT Pub. No. WO2021/100230, PCT Pub. Date May 27, 2021.
Claims priority of application No. 2019-210215 (JP), filed on Nov. 21, 2019.
Prior Publication US 2022/0412875 A1, Dec. 29, 2022
Int. Cl. G01N 22/02 (2006.01); G01N 17/00 (2006.01); G01N 22/00 (2006.01); G01N 33/38 (2006.01)
CPC G01N 22/02 (2013.01) [G01N 17/006 (2013.01); G01N 22/00 (2013.01); G01N 33/383 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A reinforcement bar corrosion evaluation device for evaluating a degree of corrosion of reinforcement bar in a reinforced concrete deck bridge, the reinforcement bar corrosion evaluation device comprising:
an acquisition section configured to acquire reflection response data related to a reflection response of electromagnetic waves irradiated from a surface of the reinforced concrete deck bridge in a depth direction of the reinforced concrete deck bridge;
a removal section configured to remove a surface frequency component obtained by the electromagnetic waves being reflected at the surface of the reinforced concrete deck bridge from a frequency distribution of a reflection response expressing the reflection response data acquired by the acquisition section; and
an evaluation section configured to evaluate a degree of corrosion of the reinforcement bar in the reinforced concrete deck bridge by using a first measurement peak value in the frequency distribution of the reflection response from which the surface frequency component has been removed by the removal section, which is a peak value of a level of a frequency component of a first frequency band, and using a second measurement peak value therein, which is a peak value of a level of a frequency component of a second frequency band that is a higher frequency band than the first frequency band.