Shields

About: Shields is a research topic. Over the lifetime, 1456 publications have been published within this topic receiving 10896 citations.

Directional short circuit detection system and method

Abstract: A unique system has been provided to precisely locate the exact position of a short along a conductor, even if the conductor is co-located with other conductors, even conductors connected to low resistance loads. A combination of low frequency test pulse signals, at low duty cycles, and the use of a directional sensor made with shields, account for accuracy and reliability of the system. The shields are arranged to optimally shield and direct signals at the transmitter test signal frequency. The shields also acts to place the shorted wire an optimal distance from the sensor. A method of short circuit location, using the direction sensor of the above-mentioned detection system, is also provided.

Note on the Efficiency of Radiation Shields

Abstract: The familiar problem of radiation shields is analyzed by matrix algebra. A general method is developed for the calculation of the efficiency of thick radiation shields of infinite thermal conductivity. If the shields are thin, the method leads to an explicit, general expression for the efficiency of n radiation shields. It is found that, in this case, the ratio of the power required to maintain a radiating surface at temperature T with n thin shields to the power required to maintain the same temperature without shields is given by [{Σ lim 1n(1emk+1eml)}−(n−1)]−1, where emk and eml are emissivities of the two sides of the mth shield.

Lightweight inflatable shadow shields for cryogenic space vehicles.

Abstract: Lightweight inflatable shadow shields for cryogenic space vehicles and performance in conjunction with superinsulation