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CONTROL OF ENERGY ABSORPTION RATE IN TRANSMISSION LINE RADIOFREQUENCY EXPOSURE SYSTEMS (JOURNAL VERSION)
Citation:
Ali, J. AND D. Elliott. CONTROL OF ENERGY ABSORPTION RATE IN TRANSMISSION LINE RADIOFREQUENCY EXPOSURE SYSTEMS (JOURNAL VERSION). U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-87/418 (NTIS PB89105928).
Description:
A frequent problem in the radiofrequency (RF) irradiation of experimental animals in health effects studies is the temporal variation of the specific absorption rate (SAR) with animal movement. An RF power controller which regulates the energy absorption rate has been designed for use with transmission line exposure systems that utilize the power difference method to monitor the SAR. The controller operates by altering the incident power to the exposure cell in order to compensate for the change in RF energy absorption rate due to animal motion. A circuit diagram is presented as well as experimental data under three conditions of exposure. The controller is effective in maintaining the mean value of energy absorption rate at the setpoint value even for the case of a highly active animal. (Copyright (c) 1987 Alan R. Liss, Inc.)