Boots – shoes – and leggings
Patent
1984-08-02
1985-12-17
Punter, William H.
Boots, shoes, and leggings
364822, G02F 133, G06G 900
Patent
active
045589259
ABSTRACT:
An acousto-optic architecture is provided for simultaneously obtaining time integration correlation and power spectrum analysis. A laser beam is expanded and split into first and second beams. The first beam is diffracted by a first acousto-optic Bragg cell, and the second beam is diffracted by a second acousto-optic Bragg cell. The diffracted first beam is split into third and fourth beams, and the diffracted second beam is split into fifth and sixth beams. A first Fourier transform lens system is placed in the path of the third beam, and a first photodiode detector array is placed at the back focal plane of the lens system. A second Fourier transform lens system is placed in the path of the sixth beam, and a second photodiode detector array is placed at the back focal place of the lens system. The fourth and fifth beams are combined and the combined beam is split into seventh and eighth beams. A first Schlerin spatial filter is disposed in the path of the seventh beam for filtering undiffracted light from it. A second Schlerin spatial filter is disposed in the path of the eighth beam for filtering undiffracted light from it. A third photodiode detector array is disposed in the output of the first Schlerin spatial filter, and a fourth detector is disposed in the output of the second Schlerin spatial filter. The outputs of the first and second photodiode detector arrays are proportional to the power spectral density of the signals S.sub.1 (t) and S.sub.2 (t), which are respectively applied to the first and second Bragg cells. These outputs are resolved to a limit determined by the time aperture of the Bragg cells and are time averaged over the integration period of the array. The output of the third photodiode detector array is proportional to the correlation of the bandpass signals S.sub.1 (t)cos .omega..sub.a t offset by the frequency .omega..sub.o and in a compressed, shifted time frame. The output of the fourth photodiode detector array is proportional to the correlation of the bandpass signals S.sub.1 (t)cos .omega..sub.a t and S.sub.2 (t)cos .omega..sub.a t offset by the frequency .omega..sub.o, but in a more restricted delay range than that of the third photodiode detector array.
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Kellman, P. "Time Integrating Optical Signal Processing", Optical Engineeg 5/6-1980, pp. 370-375.
Sprague et al. "Time Integrating Acoustooptic Correlator" App. Optics 1-1976, pp. 89-92.
Casseday et al. "A New Multi-Function Acousto Optic Signal Processor, IEEE Ultrasonic Symp., Atlanta Georgia 11-3-83 Copy In File.
Berg Norman J.
Casseday Michael W.
Filipov Andree N.
Elbaum Saul
Lane Anthony T.
Lupuloff Harry
Punter William H.
The United States of America as represented by the Secretary of
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