| 摘要 |
<p>In the method, relatively inclined beams of light (14,16) are projected towards the target (O) from spaced locations (12,18) at the station from which the distance to the target (O) is to be measured. The locations (12,18) are moved relative to one another along a linear path to bring the illuminated zones on the object (O) together. The spacing of the locations (12,18) then gives an indication of the distance sought to be measured. Apparatus for carrying out the method is also described.</p> |
