| 摘要 |
Apparatus for sensing the position of a body which is rectilinearly movable with respect to a fixed, reference body which apparatus comprises a pair of surfaces on the movable object each with areas with a low coefficient of reflection and with a high coefficient of reflection and a pair of lens systems for projecting light on and receiving reflected light from respective ones of such surfaces. Light is supplied to such lens systems by optical fibers which are coupled to light-to-electrical signal converters for providing electrical signals dependent upon the amount of reflected light received from the surfaces and hence, upon the relative positions of the bodies. The pair of surfaces may be on the end of a piston operable by the pneumatic springs of a vehicle. Also, computer systems for processing the electrical signals of the converters and for actuating controls for changing the position of the movable body.
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