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单词 Coincidence rangefinder
释义

Coincidence rangefinder

英语百科

Coincidence rangefinder

American soldiers using a coincidence rangefinder with its distinctive single eyepiece during army maneuvers in the 1940s.
Eyepiece image of a naval rangefinder, showing the displaced image when not yet adjusted for range

A coincidence rangefinder (stereoscopic, parallax, or split-image rangefinder) is a type of rangefinder that uses mechanical and optical principles to allow an operator to determine the distance to a visible object.

The device consists of a long tube, with two lenses facing forwards at either end, and an operator eyepiece in the center. Two prism wedges which, when aligned result in no deviation of the light, are inserted into the light path of one of the two lenses. By rotating the prisms in opposite directions using a differential gear, a degree of horizontal displacement of the image can be achieved.

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