Results 261 to 270 of about 33,132 (307)
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2000 IEEE International Symposium on Circuits and Systems. Emerging Technologies for the 21st Century. Proceedings (IEEE Cat No.00CH36353), 2002
We propose an adaptive optical sensor circuit performing a linear incident-light-to-voltage conversion using the channel-length-modulation effect. The sensitivity of the sensor adapts automatically to the signal level, so that a dynamic range of six decades is reachable. The process of the conversion does not involve any current integration.
Chunyan Wang 0004, Francis Devos
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We propose an adaptive optical sensor circuit performing a linear incident-light-to-voltage conversion using the channel-length-modulation effect. The sensitivity of the sensor adapts automatically to the signal level, so that a dynamic range of six decades is reachable. The process of the conversion does not involve any current integration.
Chunyan Wang 0004, Francis Devos
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Applied Optics, 2018
We introduce a transmissive refractive adaptive optics system featuring a deformable transparent optofluidic wavefront modulator and a sensorless wavefront error estimation algorithm. The wavefront modulator consists of a cavity filled with an optical liquid which is sealed by a deformable elastic polymer membrane.
Kaustubh Banerjee +3 more
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We introduce a transmissive refractive adaptive optics system featuring a deformable transparent optofluidic wavefront modulator and a sensorless wavefront error estimation algorithm. The wavefront modulator consists of a cavity filled with an optical liquid which is sealed by a deformable elastic polymer membrane.
Kaustubh Banerjee +3 more
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Adaptive optical interconnection
Optics Letters, 1991We explore the ability of a double phase-conjugate mirror to compensate for thermal, vibrational, and other environmental fluctuations. This property lends itself to the establishment and maintenance of bidirectional optical interconnections. We further introduce a bidirectional interconnection scheme that utilizes two wavelengths.
M P, Schamschula +2 more
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Adaptive control in an adaptive optics experiment
Journal of the Optical Society of America A, 2010This paper presents results from an adaptive optics experiment in which an adaptive control loop augments a classical adaptive optics feedback loop. Closed-loop wavefront errors measured by a self-referencing interferometer are fed back to the control loops, which drive a membrane deformable mirror to correct the wavefront.
Salman, Monirabbasi, Steve, Gibson
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Adaptive optics with adaptive filtering and control
Proceedings of the 2004 American Control Conference, 2004This paper presents a quasi adaptive control method for adaptive optics. Adaptive compensation is needed in many adaptive optics applications because wind velocities and the strength of atmospheric turbulence can change rapidly, rendering any fixed-gain reconstruction algorithm far from optimal.
Yu-Tai Liu, Steve Gibson 0001
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Optics Letters, 1989
There are two different approaches for improving the accuracy of analog optical associative processors: postprocessing with a bimodal system and preprocessing with a preconditioner. These two approaches can be combined to develop an adaptive optical multiprocessor that can adjust the computational steps depending on the data and produce solutions of ...
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There are two different approaches for improving the accuracy of analog optical associative processors: postprocessing with a bimodal system and preprocessing with a preconditioner. These two approaches can be combined to develop an adaptive optical multiprocessor that can adjust the computational steps depending on the data and produce solutions of ...
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Optimal and adaptive control of aero-optical wavefronts for adaptive optics
Journal of the Optical Society of America A, 2012This paper compares two control methods to predict and correct aero-optical wavefronts derived from recent flight-test data. The first is an optimal linear time-invariant controller constructed from an identified state-space model of the turbulence flow.
Jonathan, Tesch, Steve, Gibson
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Science, 1990
From the earliest days and nights of telescopic astronomy, atmospheric turbulence has been a serious detriment to optical performance. The new technology of adaptive optics can overcome this problem by compensating for the wavefront distortion that results from turbulence.
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From the earliest days and nights of telescopic astronomy, atmospheric turbulence has been a serious detriment to optical performance. The new technology of adaptive optics can overcome this problem by compensating for the wavefront distortion that results from turbulence.
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Adaptive Optics Ophthalmoscopy
Journal of Refractive Surgery, 2000ABSTRACT Retinal images in the human eye are normally degraded because we are forced to use the optical system of the human eye- which is fraught with aberrations - as the objective lens. The recent application of adaptive optics technology to measure and compensate for these aberrations has produced retinal images in human eyes with ...
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Applied Optics, 1982
The transversal filter is widely used in digital data processing. In this paper, we describe a method for using optically tapped, Bragg cell delay lines to implement a general adaptive linear prediction algorithm. Flexibility is achieved through changing the electronic signals.
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The transversal filter is widely used in digital data processing. In this paper, we describe a method for using optically tapped, Bragg cell delay lines to implement a general adaptive linear prediction algorithm. Flexibility is achieved through changing the electronic signals.
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