MR. DAVID EVANS, PA-C
Physician Assistant at Southern Blvd, Dayton, OH

4453804, Jun 12, 1984

Jan 6, 1982

6/337349

David W. Evans - Beavercreek OH

The United States of America as represented by the Secretary of the Air
Force - Washington DC

G02B 2746

35016212

In a system of real-time coherent optical filtering of visual imagery which encompasses a laser and a set of lenses for transmitting a visual target image of an input, a Fabry-Perot interferometer for filtering the target image to produce a filtered target image at an output having a predetermined bandwidth of spatial frequency information, the improvements relate to transmitting and original unfiltered image to the output for overlaying the filtered image for spatial enhancement of the predetermined spatial frequency bandwidth of information in the filtered image, and flickering the filtered image to achieve temporal enhancement of the visual information in the spatial frequency bandwidth of interest.

4426663, Jan 17, 1984

Jan 6, 1982

6/337348

David W. Evans - Beavercreek OH
Arthur P. Ginsburg - Dayton OH

The United States of America as represented by the Secretary of the Air
Force - Washington DC

H04N 574, H04N 931, G01B 902

358211

In a system for real-time coherent optical filtering of visual imagery which encompasses a laser and a set of lenses for transmitting a visual target image of an input, a Fabry-Perot interferometer for filtering the target image to produce a filtered target image at an output having a predetermined bandwidth of spatial frequency information, the improvements relate to the output being in the form of a low-light level video system capable of detecting the filtered image even when at a low level of luminance, and a laser adjustable in operating power between low and high levels and in operating wavelength within a wide range for adjusting the bandwidths of the interferometer between narrow and broad ranges.

4800404, Jan 24, 1989

Sep 22, 1986

6/910000

Arthur P. Ginsburg - Dayton OH
David W. Evans - Dayton OH
Kenneth Blauvelt - Centerville OH

Vistech Consultants, Inc. - Beavercreek OH

A61B 302, A61B 300

351243

Glare testing apparatus enclosed in a housing includes multiple discrete light sources for creating a glare condition in the field of view from an individual being tested to a target, and provision is made for selecting the location or locations of active glare sources, which includes a centrally located source of headlight glare, and a plurality of peripheral sources which can be energized selectively or collectively. Provision is also made for adjusting target luminance, glare intensity and the apparent distance between the target and the eye position in order to test near and far visual acuity under varied conditions of luminance and glare.

4448486, May 15, 1984

Jan 6, 1982

6/337350

David W. Evans - Dayton OH

The United States of America as represented by the Secretary of the Air
Force - Washington DC

G02B 528, G01B 902

35016212

In a system of real-time coherent optical filtering of visual imagery having a Fabry-Perot interferometer for use as a variable bandpass spatial filter, the improvement of having the pair of mirrors of the interferometer mounted in spaced parallel relationship to one another for rotation about a common axis. The mirrors each have a reflectivity value which changes as a function of rotation. Thus, the bandwidth of the interferometer in acting as a filter can be adjusted by merely rotating one or both of the mirrors.