Clark School Home UMD

ISR News Story

Vorontsov, Krishnaprasad, Justh and Beresnev receive sensor patent

Schematic drawing of the sensor
Schematic drawing of the sensor

Research Professor Mikhail Vorontsov (ISR), ISR Assistant Research Scientist Eric Justh, Dr. Leonid I. Beresnev (Army Research Laboratory), Professor P.S. Krishnaprasad (ECE/ISR); and Dr. Jennifer Ricklin (Army Research Laboratory) have been awarded U.S. Patent 6,911,637 for "Wavefront phase sensors using optically or electrically controlled phase spatial light modulators."

These systems and methods for optical wavefront sensing and control are based on a phase-contrast Fourier-domain filtering technique. Wavefront phase sensing is accomplished using an optically or electronically controlled phase spatial light modulator (SLM) as a Fourier-domain filter. Examples of optically controlled phase SLMs include (1) liquid crystal light valve (LCLV); (2) micro-electromechanical system (MEMS) micromirror array used in conjunction with a photodetector array; and (3) pixelized liquid-crystal device used in conjunction with a photodetector array.

The direct adaptive optic feedback system approach is capable of high-resolution real-time correction of atmospheric turbulence-induced wavefront phase aberrations. The disclosed wavefront sensors could be used with conventional low-resolution adaptive-optic wavefront correction hardware based on deformable mirrors or multi-electrode wavefront phase modulators.

The invention also includes a wavefront sensor, the "Differential Zernike Filter." This device uses the difference between two intensity measurements corresponding to equal but oppositely-directed zero-order spectral component phase shifts to produce a high visibility wavefront sensor output that is particularly well-suited for use in the direct adaptive optic feedback system. | ISR patents page |

July 16, 2005


Prev   Next

 

 

Current Headlines

Tsiropoulou to join University of New Mexico faculty

Qu Gives Keynote at WOCC 2017

Wood filter removes toxic dye from water

Prof. Alireza Khaligh to receive Outstanding Young Alumnus Award from Illinois Tech

Simon is co-editor of new Springer auditory research book

New Class Inducted into Order of the Engineer

Northrop Grumman renews as an ISR associate partner for third consecutive year

Students of Khaligh, Wu win China Scholarship Council awards

ECE Graduate Student Team, led by Prof. Khaligh, Wins 3rd place in the Allegheny Region Cleantech University Prize (CUP) Collegiate Competition 

Paley, Abshire, Martins promoted to full Professor by UMD President Wallace Loh

News Resources

Return to Newsroom

Search News

Archived News

Events Resources

Events Calendar