A Passive Electrodeless Method for Determining the Interior Field of Biological Materials
نویسنده
چکیده
A passive remote-sensing method is proposed for the measurementof the eleetric-field distribution within a biological sample. The instrument analyzes the intermodulation spectrum reradiated by a diode imbedded within the sample exposed to a dual-frequency illumination. Experimental results in a waveguidesystem indkate that the relative intensities of the intermodulation products are a unique function of the field intensity at the diode. Theseresults are also nsedto determine the basic scattering properties of the diode. A low-power free-space apparatus k described which exposesthe principal problem associated with this method: the inadvertent generation of intermwhdation frequencies. Isolation techniques are described which eliminate this problem. Finally, an analysis of a complete system shows that at 910 MHz fields can be measured in 4.0 cm of soft tissue, tan d = 0.5, without exceeding an incident power densit y of 10 mW/cm2.
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