optical rangefinder

optical rangefinder

[′äp·tə·kəl ′rānj‚fīnd·ər]
(engineering)
An optical instrument for measuring distance, usually from its position to a target point, by measuring the angle between rays of light from the target, which enter the rangefinder through the windows spaced apart, the distance between the windows being termed the baselength of the rangefinder; the two types are coincidence and stereoscopic.
References in periodicals archive ?
Also, they found volunteer alfalfa plants along roadsides and measured the distance between them and the production fields with an optical rangefinder or an automobile odometer.
In my experience a faster, more accurate, and easy to use system is the split-image optical rangefinder.
For nearly 15 years now the only practical, affordable optical rangefinder around has been the Model 1000 manufactured by Ranging, Inc, of Rochester, NY.
In World War I, optical rangefinders started to change the game for artillery spotters.

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