US 9,810,642 B2
Tunnel lining surface inspection system and vehicle used in tunnel lining surface inspection system
Yukio Akashi, Takamatsu (JP); Kazuaki Hashimoto, Takamatsu (JP); and Shogo Hayashi, Takamatsu (JP)
Assigned to WEST NIPPON EXPRESSWAY ENGINEERING SHIKOKU COMPANY LIMITED, Kagawa (JP)
Appl. No. 14/904,740
Filed by WEST NIPPON EXPRESSWAY ENGINEERING SHIKOKU COMPANY LIMITED, Takamatsu-shi, Kagawa (JP)
PCT Filed Dec. 3, 2014, PCT No. PCT/JP2014/082022
§ 371(c)(1), (2) Date Jan. 13, 2016,
PCT Pub. No. WO2016/013133, PCT Pub. Date Jan. 28, 2016.
Claims priority of application No. 2014-152323 (JP), filed on Jul. 25, 2014.
Prior Publication US 2016/0223471 A1, Aug. 4, 2016
Int. Cl. G06K 9/00 (2006.01); G01N 21/954 (2006.01); G01B 11/25 (2006.01); H04N 13/02 (2006.01)
CPC G01N 21/954 (2013.01) [G01B 11/25 (2013.01); H04N 13/0242 (2013.01); H04N 13/0253 (2013.01); G01N 2021/9548 (2013.01); G01N 2201/0216 (2013.01); G01N 2201/06113 (2013.01); G01N 2201/12 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A tunnel lining surface inspection system wherein, while a vehicle is traveling in a tunnel, a three dimensional shape of a surface of a tunnel lining surface is inspected by using a light section method using photography means and slit laser beam projecting means mounted in the vehicle, and is processed into an image used for inspecting the tunnel lining surface, the system comprising
a plurality of slit laser beam projecting means for projecting a long slit laser beam along a circumferential direction of the tunnel lining surface to each area along a circumferential direction of the one side face in the both side faces of the tunnel lining surface to the direction vertical to the surface of the tunnel lining surface,
a plurality of photography means for photographing from a direction different from a projecting direction of the plurality of slit laser lights the each area along the circumferential direction of the one side face in the both side faces of the tunnel lining surface by photographing the slit laser direction emitted to the surface of the tunnel lining surface from the oblique direction having the collimation line inclined to the surface of the tunnel lining surface, and
a fan-shaped member having predetermined width in a traveling direction of the vehicle, where its section vertical in a traveling direction of the vehicle with a fan shape forms an arc-shaped surface, being arranged in the vehicle so that one side face in both side faces of the tunnel lining surface corresponds to the arc-shaped surface of the fan-shaped member,
wherein, the plurality of slit laser beam projecting means have the arc-shaped surface of the fan-shaped member as the arrangement surface, being installed, along the circumferential direction of the arc-shaped surface, and the plurality of photography means correspond to the each of the plurality of slit laser beam projecting means, and have the arc-shaped surface of the fan-shaped member as the arrangement surface, being installed along the circumferential direction of the arc-shaped surface, apart from a position where the slit laser beam positioning means are arranged by a predetermined distance in a vehicle traveling direction, and
the system further comprises
fixing and reversing means comprising drive axis which is the vertical center axis and a stage fixed to the frame of the vehicle, for fixing the fan-shaped member to a first measurement position where a three dimensional shape of the one side face in the both side faces of the tunnel lining surface can be measured, and 180° reversing the fan-shaped member around a vertical center axis to fix the fan-shaped member to a second measurement position where the three dimensional shape of the other side face in the both side faces of the tunnel lining surface can be measured, and
image processing means for performing image processing to obtain the image used for inspecting the tunnel lining surface, by using a result of the three dimensional shape measurement of the one side face of the tunnel lining surface, measured in a state where the fan-shaped member is fixed to the first measurement position and a result of the three dimensional shape measurement of the other side face of the tunnel lining surface, measured in a state where the fan-shaped member is fixed to the second measurement position.