Results 241 to 250 of about 277,211 (280)
Some of the next articles are maybe not open access.
Optical correlator tracking nonlinearity
Applied Optics, 1987Non linearite observee en utilisant un correlateur optique de Vanderlugt etalon comme poursuiveur de corps ...
D A, Gregory, J C, Kirsch, J L, Johnson
openaire +2 more sources
Applied Optics, 1975
A real-time coherent optical correlator is described that uses the Itek PROM as a recyclable filter recording medium. Operation of a joint transform correlator is compared to a conventional Vander Lugt system. Experimental results are shown for the joint transform system, including demonstrations of the effects of target alignment and scale and the ...
P, Nisenson, R A, Sprague
openaire +2 more sources
A real-time coherent optical correlator is described that uses the Itek PROM as a recyclable filter recording medium. Operation of a joint transform correlator is compared to a conventional Vander Lugt system. Experimental results are shown for the joint transform system, including demonstrations of the effects of target alignment and scale and the ...
P, Nisenson, R A, Sprague
openaire +2 more sources
Applied Optics, 1973
A real-time optical correlator based on the principle of one-bit correlation, often used to facilitate the construction of real-time digital signal processors, is shown to have a greater immunity to mechanical noise than a comparable analog optical correlator.
G J, Aitken, D R, Carter
openaire +2 more sources
A real-time optical correlator based on the principle of one-bit correlation, often used to facilitate the construction of real-time digital signal processors, is shown to have a greater immunity to mechanical noise than a comparable analog optical correlator.
G J, Aitken, D R, Carter
openaire +2 more sources
New Multichannel Optical Correlator
Applied Optics, 1971This paper describes a multichannel optical correlator that uses two spatial dimensions to achieve multi-channel capability and operates in real time. Given I signals, r(i)(t), and J signals, s(j)(t), it can produce the I x J cross products, r(i)(t)s(j)(t), averaged over some interval.
G J, Aitken, L, Wang
openaire +2 more sources
Optics Letters, 1981
The operation of a scanning optical correlator is described and demonstrated. The device is shown to combine the advantages of a coherent correlator, which makes preprocessing operations easy to realize, with the advantages of direct-image-casting correlators, which are insensitive to setup misalignment and imperfections and do not require the ...
openaire +2 more sources
The operation of a scanning optical correlator is described and demonstrated. The device is shown to combine the advantages of a coherent correlator, which makes preprocessing operations easy to realize, with the advantages of direct-image-casting correlators, which are insensitive to setup misalignment and imperfections and do not require the ...
openaire +2 more sources
Single Nanowire Optical Correlator
Nano Letters, 2014Integration of miniaturized elements has been a major driving force behind modern photonics. Nanowires have emerged as potential building blocks for compact photonic circuits and devices in nanophotonics. We demonstrate here a single nanowire optical correlator (SNOC) for ultrafast pulse characterization based on imaging of the second harmonic (SH ...
Huakang, Yu +7 more
openaire +2 more sources
Compact planar optical correlator
Optics Letters, 1997A compact planar configuration for performing optical correlation is described. It comprises two pairs of identical holographic lenses and a holographic filter. Each pair of lenses is recorded on a single substrate; together the lenses perform exact Fourier transformation.
S, Reinhorn, Y, Amitai, A A, Friesem
openaire +2 more sources
Incoherent Optical Correlators
SPIE Proceedings, 1990Optical correlators utilizing spatially incoherent light are examined and compared with coherent correlators. Frequency and image domain optical correlator architectures are discussed. The effect of speckle noise and input noise is examined. Simplified linear systems and Fourier transform descriptions of incoherent processors are provided.
David Casasent +2 more
openaire +1 more source
SPIE Proceedings, 1989
In the past 15 years, a dozen or so designs have been proposed for compact optical correlators. Of these, maybe one-third of them have actually been built and only a few of those tested. This paper will give an overview of some of the systems that have been built as well as mention some promising early and current designs that have not been built.
Don A. Gregory, James C. Kirsch
openaire +1 more source
In the past 15 years, a dozen or so designs have been proposed for compact optical correlators. Of these, maybe one-third of them have actually been built and only a few of those tested. This paper will give an overview of some of the systems that have been built as well as mention some promising early and current designs that have not been built.
Don A. Gregory, James C. Kirsch
openaire +1 more source
SPIE Proceedings, 1990
A nonconventional setup based on the Lau effect is employed for implementing a lensless incoherent correlator of 2-D signals with compact support.
Pedro Andres +3 more
openaire +1 more source
A nonconventional setup based on the Lau effect is employed for implementing a lensless incoherent correlator of 2-D signals with compact support.
Pedro Andres +3 more
openaire +1 more source