| 摘要 |
The wheels (1,2,3,4) of a vehicle have reflecting elements (5,6,7,8) attached to them by suction cup or similar means. The reflecting elements include a dihedral mirror formation. External emitting and receiving units (11,12,13,14) are positioned adjacent to each wheel and it's reflecting element. The external emitting and receiving units may be adjusted manually along guides (9) which are themselves positioned by laser. Distances along the guides are determined by optical encoders and fork driven by rollers. Tyre marks are detected by optical fibre weaves which are placed under the vehicle road wheels. |
