Читать книгу Continuous Emission Monitoring - James A. Jahnke - Страница 139

Diffraction gratings are commonly used in the ultraviolet and visible regions of the spectrum to select specific wavelengths. A grating consists of a reflective surface finely etched with a large number of parallel lines (on the order of 600 lines/mm). Each line will scatter light impinging on it, causing the light to interfere constructively and destructively to spread out a reflected spectrum.