| タイトル | Method and apparatus for sensing a target characteristic by measuring both impedance and resonant frequency of a tank circuit |
| 本文（外部サイト） | http://hdl.handle.net/2060/20080004773 |
| 著者（英） | Laskowski, Edward L. |
| 著者所属（英） | Laskowski (Edward L.) |
| 発行日 | 1995-05-30 |
| 言語 | eng |
| 内容記述 | An apparatus for sensing a target characteristic, such as relative distance between the apparatus and target, target thickness, target material, or lateral position between the apparatus and the target, includes a coil for directing an electro-magnetic field at the target. A voltage controlled oscillator energizes the coil at a resonant frequency which is functionally related to the target characteristic. The coil has an effective impedance value at resonance functionally related to the target characteristic. A frequency monitor measures the resonant frequency. An impedance monitor determines the impedance value when the drive frequency is at the resonant value. A PROM or controller determines the target characteristic in response to the measured resonant frequency and the determined impedance value. The PROM or controller provides a signal responsive to the determined target characteristic. |
| NASA分類 | Electronics and Electrical Engineering |
| 権利 | No Copyright |
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