Dennis A Swyt

Address:

20620 Hazelnut Ct, Germantown, MD 20874

Phone:

301-540-0925

VIN:

JTJBK1BA1B2014153

Make:

LEXUS

Model:

RX 350

Year:

2011

US Patent:

41520742, May 1, 1979

Filed:

Jan 10, 1978

Appl. No.:

5/868356

Inventors:

Dennis A. Swyt - Gaithersburg MD
Russell D. Young - Gaithersburg MD

Assignee:

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

International Classification:

G01J 100
G02B 514

US Classification:

356213

Abstract:

A photometric calibrator is disclosed wherein a known and continuously vable amount of light flux received at a detector is linearly proportional to the inverse fourth power of the optical path length between the detector and a primary, quasi-point source of the light flux. The calibrator includes a secondary, quasi-point light flux source wherein the total flux emitted thereby is proportional to the flux received thereby over a quasi-point detecting area located at some distance, d, from the primary source. The detector is located at an equal distance d from the secondary source.