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Acousto Optical Spectrometer
The principle of an AOS is based on the diffraction of light at ultrasonic waves. A piecoelectric transducer, driven by the RF-signal (from the receiver), generates an acoustic wave in a crystal (the so called Bragg-cell). This acoustic wave modulates the refractive index and induces a phase grating. The Bragg-cell is illuminated by a collimated laser beam. The angular dispersion of the diffracted light represents a true image of the IF-spectrum according to the amplitude and wavelengths of the acoustic waves in the crystal. The spectrum is detected by using a single linear diode array (CCD), which is placed in the focal plane of an imaging optics.
Additional recommended knowledge
Depending on the crystal and the focal length of the imaging optics, the resolution of this type of spectrometer can be varied.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Acousto_Optical_Spectrometer". A list of authors is available in Wikipedia.|