✦ LIBER ✦

Control of energy absorption rate in transmission line radiofrequency exposure systems

✍ Scribed by Dr. Joseph S. Ali; Dorothy J. Elliott

Publisher: John Wiley and Sons
Year: 1987
Tongue: English
Weight: 501 KB
Volume: 8
Category: Article
ISSN: 0197-8462
DOI: 10.1002/bem.2250080207

No coin nor oath required. For personal study only.

✦ Synopsis

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 that 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 that is 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.

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✍ William F. Pickard; William L. Straube; Eduardo G. Moros; Xiaobing Fan 📂 Article 📅 1999 🏛 John Wiley and Sons 🌐 English ⚖ 148 KB

In vitro experiments in bioelectromagnetics frequently require the determination of specific absorption rate (SAR) within a layer of cells on the bottom of a culture flask when the SAR has rapid spatial variation both horizontally within the cell layer and vertically in the medium bathing the cells.