James R Fienup

US Patent:

6597304, Jul 22, 2003

Filed:

Jul 27, 2001

Appl. No.:

09/916422

Inventors:

James R. Fienup - Ann Arbor MI

Assignee:

Veridian ERIM International, Inc. - Ann Arbor MI

International Classification:

G01S 1389

US Classification:

342 25, 342159, 342161, 342162, 342191, 342194

Abstract:

A system and method for sensing phase errors in a multiple receiver array use three non-collinear transmitters transmitting first, second, and third signals to a target and receiving corresponding signals reflected from the target using the multiple receiver array. In one embodiment, each transmitter transmits a characteristic signal which can be distinguished from each other by the receivers. In one embodiment, each transmitter transmits a slightly different monotone frequency that is preferably outside any imaging bandwidth. The sheared products computed from heterodyne measurements at the receivers in the array based on the reflected signals from the three transmitters are used to determine and correct for the combined transmitter/receiver phase errors at each of the receivers in the array.

US Patent:

8279329, Oct 2, 2012

Filed:

Apr 10, 2008

Appl. No.:

12/100723

Inventors:

Sapna Shroff - Rochester NY, US
David R. Williams - Rochester NY, US
James Fienup - Rochester NY, US

Assignee:

University of Rochester - Rochester NY

International Classification:

H04N 5/222

US Classification:

348370

Abstract:

An object to be imaged is illuminated with a structured (e. g. , sinusoidal) illumination at a plurality of phase shifts to allow lateral superresolution and axial sectioning in images. When an object is to be imaged in vitro or in another situation in which the phase shifts cannot be accurately determined a priori, the images are taken, and the phase shifts are estimated a posteriori from peaks in the Fourier transforms. The technique is extended to the imaging of fluorescent and non-fluorescent objects as well as stationary and non-stationary objects.

US Patent:

46079149, Aug 26, 1986

Filed:

Oct 12, 1983

Appl. No.:

6/541267

Inventors:

James R. Fienup - Ann Arbor MI

Assignee:

Environmental Research Institute of Michigan - Ann Arbor MI

International Classification:

G03H 108

US Classification:

350320

Abstract:

The merit function of an optical system employing a holographic optical element (HOE) is optimized by determining the ideal phase transfer functions of the hologram over a set of field angles and then arriving at the phase transfer function of the hologram by averaging over the ideal phase transfer functions.

US Patent:

44127197, Nov 1, 1983

Filed:

Apr 10, 1981

Appl. No.:

6/252774

Inventors:

James R. Fienup - Ann Arbor MI

Assignee:

Environmental Research Institute of Michigan - Ann Arbor MI

International Classification:

G02B 532

US Classification:

350 37

Abstract:

An optically transmissive article having predetermined net reflectance characteristics and a method of forming such an article is disclosed. The article includes a holographic layer with fringe patterns generally paralleling a major surface of the article. The fringe patterns have been formed in such a way that the amplitude and phase of the light diffracted therefrom is in a predetermined relationship with the amplitude and phase of the reflected light. The relationship between the respective amplitudes and phases of the diffracted and reflected light determines the net reflectance characteristics of the article. In a preferred embodiment, the hologram is formed such that the diffracted light has the same amplitude but is 180. degree. out of phase with the reflected light so as to provide an antireflective coating for the article. In the method of making the article, the phase of one of the beams utilized in the formation of the hologram is adjusted until the desired net reflectance characteristics are detected.