Range finder - Sokkyogi

Japanese: 測距儀 - そっきょぎ

A general term for a device that measures distance and can be considered almost synonymous with a rangefinder, but distance finders are often used to measure long distances. There are optical distance finders, which use trigonometry to find the distance from the target direction and a baseline, just like triangulation, radio distance finders, which send out radio waves and measure the distance from the time it takes for them to be reflected back or from the phase difference, and optical distance finders, which use the same principle but use light instead of radio waves and place a reflector at the position of the target to be measured.

Source : Heibonsha Encyclopedia About MyPedia Information

Japanese:

距離を測定する装置の総称で，距離計とほぼ同義と考えてよいが，長い距離の測定に用いられるものを測距儀と呼ぶ場合が多い。三角測量と同じく目標の方向と基線から三角法を使って距離を求める光学式，電波を発射してそれが反射されて戻ってくるまでの時間や位相差から距離を求める電波測距儀，同じ原理だが電波の代りに光を用い，測定すべき目標の位置に反射鏡をおく光波測距儀などがある。

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