1 October 1993 High-speed hybrid optical/digital correlator system
Author Affiliations +
Optical Engineering, 32(10), (1993). doi:10.1117/12.146387
Abstract
A hybrid optical/digital configuration to implement a highspeed correlator is described. The input data is digitally Fourier transformed at video rates utilizing specialized digital signal processing chip sets and the computed spectral phase data passed to an electrically addressed phase modulating spatial light modulator (SLM). Successive templates, which are stored as angle multiplexed volume holograms in a photorefractive crystal, are reconstructed and optically correlated with the current input scene during an interval in which the SLM display is held stable. In this way, shift invariance, one of the major advantages of the correlation technique, is preserved. Of critical importance to the speed of operation are the energy losses of the coherent wavefront through the system and the rate at which correlation plane data can be converted to an electronic signal; both of these issues are considered to estimate that at least a 3-kHz search rate is achievable from a 1000 template memory with system components currently available.
Rupert C. D. Young, Christopher R. Chatwin, Brian F. Scott, "High-speed hybrid optical/digital correlator system," Optical Engineering 32(10), (1 October 1993). http://dx.doi.org/10.1117/12.146387
JOURNAL ARTICLE
8 PAGES


SHARE
KEYWORDS
Spatial light modulators

Holograms

Video

Volume holography

Optical correlators

3D image reconstruction

Charge-coupled devices

RELATED CONTENT

High-speed photography in Poland
Proceedings of SPIE (January 01 1993)
Correcting spurious resolution in defocused images
Proceedings of SPIE (February 12 2007)
Laser-induced instabilities in anisotropic liquids
Proceedings of SPIE (April 04 1997)

Back to Top