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Fresnel Image Wavefront Sensor With High Sensitivity and Variable Spatial Sampling

Award Information
Agency: Department of Defense
Branch: Air Force
Contract: N/A
Agency Tracking Number: 20007
Amount: $375,000.00
Phase: Phase II
Program: SBIR
Solicitation Topic Code: N/A
Solicitation Number: N/A
Timeline
Solicitation Year: N/A
Award Year: 1994
Award Start Date (Proposal Award Date): N/A
Award End Date (Contract End Date): N/A
Small Business Information
20600 Gramercy Place, Suite 103
Torrance, CA 90501
United States
DUNS: N/A
HUBZone Owned: No
Woman Owned: No
Socially and Economically Disadvantaged: No
Principal Investigator
 Lev Sadovnik
 (310) 320-3088
Business Contact
Phone: () -
Research Institution
N/A
Abstract

To reduce the complexity of Hartmann sensor optics and to adapt the wavefront sensor (WFS) to variable spatial sampling, Physical Optics Corp. proposes to design a novel WFS based on the Fresnal Image (FI) effect whereby a periodic structure illuminated by coherent light will image itself with variable multiplication depending upon the position of the observation plane. Local wavefront distortion (deviation from a plane or a sperical wavefront) causes displacement of corresponding elementary images sonstituting an FI of a periodic structure. A simple algorithm is proposed to compute wavefront local tilt from displacement measurement. The WFS has various advantages over other methods. The optical system is extremely simple, can be implemented in any spectral range, and give a clear two-dimensional pattern of inhomogeneties of the aerodynamic field. By selecting the transmittance profile of the elementary object, it is possible to adjust the WFS spatial sampling rate to the medium under investigation. The method can be used for long-aperature analysis and has higher sensitivity than the Hartmann method. A high rate of temporal sampling will be achieved by employing two 15KHz frame rate dedicated CCD arrays and POC's proporietary 48 DSP boards permitting highly parallel image processing.

* Information listed above is at the time of submission. *

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