Charles D Layne

Address:

7814 Westminster Abbey Blvd, Orlando, FL 32835

Phone:

407 808-6142

VIN:

WBAHN83547DT69759

Make:

BMW

Model:

7 SERIES

Year:

2007

US Patent:

42226678, Sep 16, 1980

Filed:

Aug 24, 1977

Appl. No.:

5/827430

Inventors:

Charles R. Layne - Orlando FL

Assignee:

Martin Marietta Corporation - Orlando FL

International Classification:

G01B 902

US Classification:

356346

Abstract:

A beam of light to be evaluated for coherence length is projected through an optical cavity having non-parallel reflecting surfaces to form a Fizeau fringe pattern. A multiple detector array senses the light output of the cavity at various locations along the fringe pattern. The sensed values of the light are compared with one another and the polarity of their difference is used to determine whether the coherence length of the light beam is above a predetermined threshold value.

US Patent:

40110168, Mar 8, 1977

Filed:

Sep 23, 1975

Appl. No.:

5/616115

Inventors:

Charles R. Layne - Orlando FL
M. William Ford - Maitland FL

Assignee:

Martin Marietta Corporation - New York NY

International Classification:

G01J 346
H01J 3912
H01L 2714

US Classification:

356195

Abstract:

A double-layer photodiode is created in an integral structure to form two diodes, the upper diode having a relatively thin active region and the lower diode a relatively thick active region. Light whose wavelength is to be measured is directed onto the upper diode. The thickness of the first diode is chosen so that, in the spectrum of light wavelengths being measured, the energy of the shortest wavelength is entirely absorbed therein. As the radiation wavelength increases, the absorption by the upper diode decreases exponentially, and the unabsorbed light is transmitted through the thin active region into the thick active region of the lower diode where it is absorbed. The thickness of the active region of the lower diode is chosen so that it absorbs substantially all of the energy of longest wavelength in the spectrum being measured. The absorption of the photon energy in each diode creates electron-hole pairs therein which produce in each diode a change in conductivity which is proportional to the absorbed energy. Therefore, since the difference in conductivities of the two diodes is a function of the wavelength of the incident light, as the wavelength changes, the difference between changes in the conductivity of the two diodes, divided by the sum of the changes in conductivity, is a function which is a single-valued function of the wavelength of the incident light and which is independent of the intensity of the incident light.