A type of diffraction grating invented by R.W. Wood for infrared spectroscopy. The grooves of the diffraction grating are made with a diamond with a polished tip, creating sawtooth grooves that concentrate most of the incident energy in the desired order of the spectrum. It was named after its similarity to an echelon grating (step grating). Today, with advances in technology, most diffraction gratings with many grooves for ultraviolet use are made using this method. (→ Blaze) Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
R.W.ウッドが赤外線分光用に考案した回折格子の1種。回折格子の溝を刻むのに先端を研磨したダイヤモンドを使い,鋸歯状の溝をつけたもので,所要の次数のスペクトルに大部分の入射エネルギーが集中するようになっている。その作用がエシェロン格子 (階段格子 ) に似ているので,この名がつけられた。現在では技術が進んで,紫外線用の溝数の多い回折格子でも,ほとんどこの方法でつくられる。 (→ブレーズ )
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