Abstract: A two-dimensional displacement sensor includes first and second laser units that emit first laser light incident on the surface of the strip-shaped member from a direction intersecting the thickness direction of the strip-shaped member and second laser light incident on the surface of the strip-shaped member from a direction parallel to the thickness direction of the strip-shaped member, a camera that has a light receiving element for receiving light reflected from the surface of the strip-shaped member and measures the amount of displacement of the surface of the strip-shaped member from the reflected light receiving position detected by the light receiving element, an optical element for focusing the reflected light on the light receiving element, and a switching member for switching the laser light to be incident on the surface of the strip-shaped member between the first laser light and the second laser light.

Abstract: A two-dimensional displacement sensor includes first and second laser units that emit first laser light incident on the surface of the strip-shaped member from a direction intersecting the thickness direction of the strip-shaped member and second laser light incident on the surface of the strip-shaped member from a direction parallel to the thickness direction of the strip-shaped member, a camera that has a light receiving element for receiving light reflected from the surface of the strip-shaped member and measures the amount of displacement of the surface of the strip-shaped member from the reflected light receiving position detected by the light receiving element, an optical element for focusing the reflected light on the light receiving element, and a switching member for switching the laser light to be incident on the surface of the strip-shaped member between the first laser light and the second laser light.

Abstract: In order to measure the length F of the band-shaped member 15 in all the positions in a specified width-direction region with a simple construction, a two-dimensional laser displacement sensors 18, 19 emitting laser beams 22, 23 inclined at a certain angle with respect to a longitudinal direction of the band shaped member 15 and the band-shaped member 15 move relative to each other in the longitudinal direction of the band-shaped member 15, each position of a starting end 15a and a terminating end 15b of the band-shaped member 15 crossing the laser beam 22, 23 is detected repeatedly by the two-dimensional laser displacement sensors 18, 19 each time a relative moving distance between the two-dimensional laser displacement sensors 18, 19 and the band-shaped member 15 reaches a certain value, a position information of the starting end 15a and the terminating end 15b of the band-shaped member 15 at each width-direction position is obtained from a detection result thereof, and the length of the band-shaped member

Abstract: In order to measure the length F of the band-shaped member 15 in all the positions in a specified width-direction region with a simple construction, a two-dimensional laser displacement sensors 18, 19 emitting laser beams 22, 23 inclined at a certain angle with respect to a longitudinal direction of the band shaped member 15 and the band-shaped member 15 move relative to each other in the longitudinal direction of the band-shaped member 15, each position of a starting end 15a and a terminating end 15b of the band-shaped member 15 crossing the laser beam 22, 23 is detected repeatedly by the two-dimensional laser displacement sensors 18, 19 each time a relative moving distance between the two-dimensional laser displacement sensors 18, 19 and the band-shaped member 15 reaches a certain value, a position information of the starting end 15a and the terminating end 15b of the band-shaped member 15 at each width-direction position is obtained from a detection result thereof, and the length of the band-shaped member