Abstract: The object of the invention is interference filter arrangements with surge protection having, an input for a conductive phase and a neutral phase of a three-wire alternating-current voltage system, an output for a protected conductive phase and a protected neutral phase of a three-wire alternating-current voltage system, at least one terminal for a protective earth, at least one first coil arranged as a filter element between the input of the conductive phase and the output of the protected conductive phase, at least one second coil arranged as a filter element between the input of the neutral phase and the output of the protected neutral phase, at least one first three-pole gas-filled surge arrester arranged with its two external poles parallel to the first coil, at least one second three-pole gas-filled surge arrester arranged with its two external poles parallel to the second coil.
Abstract: Ferroelectric materials are disclosed as reversible holographic recording media (25) for use in two-photon recording systems. The ferroelectric materials disclosed herein provide long-lived electronic states intermediate the ferroelectric material's valence and conduction bands. These intermediate states have a sufficiently long life (on the order of 1 to 100 milliseconds) that low-power continuous wave ("cw") lasers (1) can be used to record interference patterns on them. Thus, two-photon holographic recording systems are also disclosed which do not require high-power, short pulse length, mode-locked or Q-switched lasers. Rather, the disclosed holographic recording systems employ visible and near IR cw lasers such as diode lasers.The disclosed two-photon holographic recording systems provide for absorption of a first photon which excites electrons of holographic recording media to an intermediate state.
Abstract: Utilizing sections of charged transmission line cables and optically-actied semiconductor switches, the direct generation of high power RF is demonstrated.
Type:
Grant
Filed:
May 26, 1989
Date of Patent:
November 6, 1990
Assignee:
The United States of America as represented by the Secretary of the Army
Inventors:
Anderson H. Kim, Maurice Weiner, Lawrence J. Bovino, Robert J. Youmans