| 单词 | echelon |
| 释义 | echelon A form of interferometer consisting of a stack of glass plates arranged stepwise with a constant offset. It gives a high resolution and is used in spectroscopy to study hyperfine line structure. In the transmission echelon the plates are made equal in optical thickness to introduce a constant delay between adjacent parts of the wavefront. The reflecting echelon has the exposed steps metallized and acts like an exaggerated diffraction grating |
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