| 摘要 |
An apparatus is employed for providing, from an observation point, indication of a range (D) to a target. The apparatus employs two parallel optical channels (OA, OB) which are connected to an observation instrument. At least one of the two optical channels leads by the intermediary of optic fibres whose first ends are disposed in parallel and aimed at the target (E). At the other ends (OC) two images of the target are obtained. Displacement means (F) is provided for mutual parallel displacement of the first and/or second fibre ends for the purposes of moving, from an initial or reference position, the above-mentioned two images in relation to one another and for superimposing them upon one another in the superposed image. Indication of the above-mentioned range to the target is effected by read-off means directly on the displacement means and/or by means (G, I, S) sensing the parallel displacement. |
