Acousto Optical Spectrometer

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.

Depending on the crystal and the focal length of the imaging optics, the resolution of this type of spectrometer can be varied.

Wikimedia Foundation. 2010.

Игры ⚽ Нужно решить контрольную?

Look at other dictionaries:

  • NANTEN2 Observatory — Organization Operated by several universities Wavelength regime 110 GHz to 880 GHz Physical characteristics Telescope style Cassegrain reflector Diameter 4 m ( 13.1 feet) Collecting area Effective …   Wikipedia

  • Chemical imaging — (as quantitative chemical mapping) is the analytical capability to create a visual image of components distribution from simultaneous measurement of spectra and spatial, time informations.[1][2] The main idea for chemical imaging, the analyst may …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”