Comparison length measuring device

Japanese: 比較測長器 - ひかくそくちょうき
Comparison length measuring device
Also known as comparator. A general term for measuring instruments that use a block gauge or other standard gauge as a reference to compare the length of an object being measured and magnify the difference. Depending on the magnification mechanism, there are mechanical types such as dial gauges and micrometers, optical types that use an optical lever or optical interference, air micrometers that use air flow, electric micrometers that convert the value into an electrical quantity, and photoelectric types that use a photoelectric element and optical grid.

Source : Heibonsha Encyclopedia About MyPedia Information

Japanese:
コンパレーターcomparatorとも。ブロックゲージその他の標準ゲージを基準として,被測定物の長さを比較,その差を拡大して求める測定器の総称。拡大機構によって,ダイヤルゲージやマイクロメーターなどの機械式,光てこや光の干渉を利用した光学式のほか,空気流を利用する空気マイクロメーター,電気量に変換して示す電気マイクロメーター,光電素子と光格子を用いた光電式などがある。

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