Title:
METHOD AND APPARATUS FOR MEASURING POSITION OF RAIL, AND MEASURING APPARATUS FOR ANGLE OF ATTACK
Document Type and Number:
Japanese Patent JP3148437
Kind Code:
B2
Abstract:
PURPOSE: To measure the position of an end of a rail during running by projecting a linear light beam onto the rail face, forming an image of the scattering light on a line sensor and measuring the position by the size of signals from each pixel of the line sensor.
CONSTITUTION: The laser light from a light source 9 is projected with some diverging angles, which is received by a collimator lens 10. As a result, a beam waist is generated in the vicinity of the tread of a rail 1. A cylindrical concave lens 11 is so arranged as to have its axis of the cylinder in parallel to the longitudinal direction of the rail 1, diverging the incident light in the perpendicular direction to the axis. Therefore, the light emitted from the lens 10 is diverged in the lateral direction of the rail 1 by the lens 11 and turned to slim linear beams traversing the rail 1 in the vicinity of the tread of the rail 1. The linear beam are scattered at the surface of the rail, so that a projected pattern 8 is seen from all the directions. The scattering light from the pattern 8 is detected by a photodetecting lens 12 disposed slantwise up in the longitudinal direction of the rail 1, and an image is formed on a photodetecting surface of a CCD line sensor 13.
Inventors:
Yuji Yamashita
Yoshimitsu Sugiura
Koji Asano
Toshishige Nagao
Hideki Nakano
Ryuichi Honda
Yoshimitsu Sugiura
Koji Asano
Toshishige Nagao
Hideki Nakano
Ryuichi Honda
Application Number:
JP2093193A
Publication Date:
March 19, 2001
Filing Date:
February 09, 1993
Export Citation:
Assignee:
Mitsubishi Electric Corporation
International Classes:
B61K9/08; G01B11/00; (IPC1-7): G01B11/00; B61K9/08
Domestic Patent References:
| JP4919837A | ||||
| JP63254649A | ||||
| JP6123910A |
Attorney, Agent or Firm:
Yahei Takase