Research/Patents/US 5142418
US 5142418Tier 3 — General Defense

SUPERCONDUCTING TUNABLE INORGANIC FILTER

Assignee

US Government

Filed as: UNITED STATES OF AMERICA, THE, AS REPRESENTED BY THE SECRETARY OF THE AIR FORCE

Filed

Jul 20, 1989

Granted

Aug 25, 1992

Location

TIPP CITY OH US

Abstract

An optical filter structure for blocking radiation at or shorter than a preselected design wavelength is described which comprises a substantially transparent dielectric host material having dispersed therethrough a multiplicity of grains in preselected size and volume density within the dielectric, the grains comprising a material characterized by a transition between insulating and superconducting states at a characteristic transition temperature. The grains have diametric size substantially smaller then the longest wavelength of light to be absorbed, the filter absorbing resonantly via the dielectric anomaly and being tunable through selection of volume fraction of the grains within the dielectric.

Source: Google Patents

35 USC §181 Secrecy Order

Imposed

Jan 17, 1990

Rescinded

Oct 7, 1991

Duration

1 year, 8 months

Inventor

  • 1ROBERT J. SPRY

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Back to patent indexSource: USPTO 35 USC §181 secrecy order records