USA as Represented by Secretary of the Navy

The Curran Company

Michael B Slocum

Joseph C Weibler

Robert E Richardson

Dale G Svetanoff

Michael O Hatfield

Matthew Squire

Stan Zielinski

An apparatus is provided for determining an electromagnetic (EM) characteristic of a material, including a chamber, an antenna, a transmitter, a receiver and a processor. The chamber includes a permanent boundary that encloses a volume; a removable panel along the boundary. The panel includes the material. The antenna is disposed in the chamber for transmitting source EM radiation and receiving reflected EM radiation. The transmitter injects the source EM radiation via the antenna into the chamber. The source EM radiation includes continuous wave (CW) and pulse signals. The receiver obtains reverberated EM radiation from the chamber via the antenna and produces an intermediate frequency signal. The processor controls the transmitter and the receiver. The processor determines a decay time of the EM radiation from the intermediate frequency signal. The material is a test substance for comparison with a calibration reference substance on the removable panel having an established EM characteristic in the chamber, based on the decay time for the reference substance. The processor determines the EM characteristic from a decay time of the test substance and a reference decay time of the reference substance.

Electromagnetic surface resistivity determination

A tuner ( ) for a reverberation chamber is provided comprising a plurality of electrically conductive surfaces ( ) attached to each other in a Z-fold configuration. Each lateral edge ( ) of the tuner is contacted with a generally planar, laterally positioned substrate ( ) which prevents lateral extension or medial compression of the Z-fold. Optionally, end substrates ( ) are attached to each of the two leading edges ( ). Also, a device minimizes electromagnetic radiation leakage along a shaft including: a bearing housing; a plurality of thrust bearings contacting the bearing housing and axially juxtaposed along the shaft so that at least two thrust bearings oppose each other; a radial bearing intermediate each thrust bearing; and a provision for adjustably moving the thrust bearings toward each other so as to compress the thrust bearings against the bearing housing.

Reverberation chamber tuner and shaft with electromagnetic radiation leakage device

Growing community of inventors

Colonial Beach, VA, United States of America

Michael B Slocum