The visualization of RF probe electric fields.
An assembly of resistive paper and liquid crystal sheet, conveniently and cheaply constructed for visual detection of the electric fields associated with an rf probe, is presented. Electrical asymmetries, and "hot-spots" usually associated with conservative electric fields, are easily visualized by the color patterns displayed. The device is of considerable assistance in probe design and the minimization of dielectric loss.
Chen
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CN
Biomedical Engineering & Instrumentation Program, National Center for Research Resources, National Institutes of Health, Bethesda, MD 20892.
Hoult
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DI
D003116:Color; D003461:Crystallography; D004553:Electric Conductivity; D017097:Electric Impedance; D004574:Electromagnetic Fields; D055590:Electromagnetic Phenomena / Q000295:instrumentation*; D006358:Hot Temperature; D009682:Magnetic Resonance Spectroscopy / Q000295:instrumentation*; D010209:Paper; D013814:Thermal Conductivity