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Dielectric Detection Using Resonant Radio-Frequency Waves in an Electromagnetic Cavity Device.
| 题名： | Dielectric Detection Using Resonant Radio-Frequency Waves in an Electromagnetic Cavity Device. |
| 作者： | BECKLEY, H. F.; KRAUSS, R.; WEATHERALL, J. C. |
| 关键词： | DIELECTRIC DETECTION; MATERIALS DETECTION; METAL DETECTORS |
| 摘要： | We describe the construction and testing of a prototype device designed to detect materials in glass and plastic containers using electrical measurement. The technique makes use of an electromagnetic cavity. A signal generator radiates a radio signal of variable frequency into the cavity, and a detector measures the response of the cavity as a function of frequency. Strong electromagnetic responses occur at certain well-defined 'resonant' frequencies. Using our device, we can detect how the electromagnetic resonances shift in their frequencies when a filled container is placed inside the cavity. This response depends on the electrical permittivity, or dielectric constant, of the filler material. Because the dielectric constant is a physical property that varies widely among materials, this electrical measurement is a useful discriminate for identification. A potential use of this device is to screen for explosives or flammable materials. |
| 报告类型： | 科技报告 |
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