| 摘要 |
A simple, inexpensive apparatus is disclosed for measuring position in a robotic mechanism. A light source illuminates a reflective target, and a light detector views the target, sensing light reflected from the target. By virtue of the characteristics of the light source, the shape and material of the target, and the arrangement of the light source, target, and detector, the intensity of light received by the detector varies with the relative position of the mechanism and the target. Optionally, a tube limits the field of view of the detector. The detector may be moved until a local maximum is found for the reflected light from the target. A method of operating the apparatus is also disclosed.
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