Roger L Allen

US Patent:

40126919, Mar 15, 1977

Filed:

Apr 8, 1976

Appl. No.:

5/674999

Inventors:

Filbert J. Bartoli - Upper Marlboro MD
Leon Esterowitz - Springfield VA
Roger E. Allen - Alexandria VA
Melvin R. Kruer - Oxon Hill MD

Assignee:

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

International Classification:

G01R 2702

US Classification:

324 65R

Abstract:

A method of determining thermal constants of bonding layers of an infrared ensor which comprises cooling a bonded layer sensor to 77. degree. K and then heating the sensor by a quick pulse of heat. The electrical resistance of the sensor is measured and the measurement continued to determine a thermal profile. The measured thermal profile is compared with a known profile to determine thickness of the bonding layers and the material layers.

US Patent:

41173295, Sep 26, 1978

Filed:

Apr 22, 1977

Appl. No.:

5/790130

Inventors:

Melvin R. Kruer - Oxon Hill MD
Leon Esterowitz - Springfield VA
Filbert J. Bartoli - Upper Marlboro MD
Roger E. Allen - Alexandria VA

Assignee:

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

International Classification:

G01J 100
G01T 122

US Classification:

250338

Abstract:

A photoconductive detector comprising a thin film of photoconductive material deposited on a thin substrate of high thermal conductivity having a surface area that is large relative to the detector's absorbing surface area. The back surface of the substrate is metalized and soldered to a high-thermal-conductivity, large-thermal-mass heat buffer which is coupled to a heat sink. The resulting detector is hardened against damage resulting from laser irradiation.

US Patent:

42175470, Aug 12, 1980

Filed:

Feb 13, 1979

Appl. No.:

6/011821

Inventors:

Filbert J. Bartoli - Upper Marlboro MD
Leon Esterowitz - Springfield VA
Roger E. Allen - Alexandria VA
Melvin R. Kruer - Oxon Hill MD

Assignee:

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

International Classification:

G01R 3126
G01R 2702

US Classification:

324158R

Abstract:

A method for determining the compensation density of narrow-gap semiconductors. Photo-excited carriers are generated by uniformily irradiating a sample with a laser pulse of a particular density and pulse width for a particular time length and at a low sample temperature. The laser wavelength is chosen with a photon energy sufficiently high that carriers are excited from the conduction band by normal intrinsic absorption (one-photon absorption). Subsequent to the laser pulse, conductivity-voltage measurements are taken as a function of time during the photo-electron decay. Such measurements are made for different applied source-detector connections on the same sample with identical pulse-time values for each different correction. The sample is then laser-pulsed as before with a magnetic field normal to the sample surface to obtain Hall-voltage measurements. The measurements are averaged for the same time duration and the average of all curves are used in the determination.

US Patent:

42959896, Oct 20, 1981

Filed:

Jun 23, 1980

Appl. No.:

6/162347

Inventors:

Philipp H. Klein - Washington DC
Arrigo Addamiano - Alexandria VA
Roger Allen - Alexandria VA

Assignee:

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

International Classification:

C09K 11463

US Classification:

2523014F

Abstract:

A cubia, yttria stabilized halnia phosphor, doped with Ce. sup. 3+, has been iscovered. The phosphor has a blue luminescence, peaking at about 4200 A, with a secondary peak in the 3800-4000 A region. The optimum composition is 3hfO. sub. 2 :Y. sub. 2 O. sub. 3 :Ce. sup. 3+ where the Ce. sup. 3+ dopant ranges from 0. 1-1. 0 weight %.

US Patent:

41260333, Nov 21, 1978

Filed:

Jun 23, 1977

Appl. No.:

5/809490

Inventors:

Filbert J. Bartoli - Upper Marlboro MD
Leon Esterowitz - Springfield VA
Roger E. Allen - Alexandria VA
Melvin R. Kruer - Oxon Hill MD

Assignee:

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

International Classification:

G01N 2518

US Classification:

73 15A

Abstract:

A method for determining in situ the thermal conductances of bonding layers of detectors in infrared detector arrays for quality selection of preferred detector arrays. Each detector of the array is heated successively by laser pulses of variable pulse width and the thermally-induced change in detector resistance is measured as a function of time after each laser pulse and converted directly to its corresponding temperature. Using measured values of detector resistance as a function of temperature for each detector, one can obtain the time-dependence of the detector temperature following each laser pulse for each detector of the array.