| 单词 | echelette grating |
| 释义 | echelette grating [¦esh·ǝ¦let or ¦āsh¦let ´grād·iŋ] SPECTROSCOPY A diffraction grating with coarse groove spacing, designed for the infrared region; has grooves with comparatively flat sides and concentrates most of the radiation by reflection into a small angular coverage. |
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