| 摘要 |
Method and device for determining the position of a movable member (M) by means of optical elements integral in the displacement with the movable member and presenting optical properties which vary according to the displacement of said movable member. According to the invention, at least two optical elements (1 and 2) are associated to said movable member (M), which article elements present each, for an incident light beam which traverses them, an optical density varying according to a known law in parallel to said displacement; a common incident light beam is directed to said optical elements (1 and 2); the power of light beams respectively transmitted by said optical elements is measured; from the thus measured transmitted light powers, a magnitude R, of the form R = K.x is calculated, wherein K is a constant and x is the value of said displacement from an origin; and from the value of the magnitude R, the value x of said displacement is deduced.
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