Spectral imaging system and method employing an acousto-optic tu

Details Spectral imaging system and method employing an acousto-optic tu Spectral imaging system and method employing an acousto-optic tu

1997-09-30

1998-10-27

Evans, F. L.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

356308, 356328, G01J 328

Patent

active

058284516

ABSTRACT:
An acousto-optic tunable filter (AOTF) has one or more optical wavelength passbands dependent on the frequency or frequencies of a radio frequency signal applied thereto. A radio frequency generator applies the radio frequency signal under computer control of the RF frequency so that the radio frequency signal has one or more preselected frequency components. An input optics system directs incident object or scene light to the AOTF. A first polarizing element passes to the AOTF only image light which is polarized in a first direction. A second polarizing element receives output image light from the AOTF and passes only image light which is polarized in a direction orthogonal to the first direction. The image light passed by the second polarizing element is detected by a camera. An output optics system focusses image light passed by the second polarizer on an image plane of the camera, and an image corresponding to the detected image light is recorded. An image processor receives recorded image data for processing.

REFERENCES:
patent: 4783166 (1988-11-01), Stern
patent: 5216484 (1993-06-01), Chao et al.
patent: 5606413 (1997-02-01), Bellus et al.
"White-Light Imaging By Use of a Multiple Passband Acousto-Optic Tunable Filter", Applied Optics, D.R. Suhre et al, vol. 35, No. 22, Aug. 1, 1996, pp. 4494-4501.

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