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Unformatted text preview: Czerny-Turner Monochromator 3 A monochromator selects out a single wavelength from a broad spectrum of light. To accomplish this, the light must be dispersed into its component colors. The dis- persive element could be a prism or a grating. In a Czerny-Turner monochromator, a planar metallic reflection grating serves this role. A Czerny-Turner monochromator is shown in the figure below. In this type of monochromator, a planar grating with a period is used to diffract a plane wave. The directions of the various wavelengths are given by the backward- diffracted-order grating equation, sin + sin i = i n 1 . For the common situation of a monochromator in air, n 1 equals 1. Similarly, for first- order diffraction, i equals 1. By rotating the grating to an angle , the freespace wave- length can be selected to pass through the system. The grating is rotated about an axis that is normal to the page of the figure. The rotation angle of the grating ( ) is the angle between the normal to the grating (long dashed line) and the axis of the in-...
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This note was uploaded on 04/29/2008 for the course ECE 4500 taught by Professor Gaylord during the Spring '08 term at Georgia Institute of Technology.
- Spring '08