| 摘要 |
PROBLEM TO BE SOLVED: To provide a physical property discriminating device easily and quickly catching a distinction between liquids such as between distilled water and tap water or between gasoline and kerosene as a difference of physical properties and detecting a nonmetal foreign matter in the liquid. SOLUTION: Using a direct digital synthesizer DDS, a wide band scanning of a circuit including a specimen is carried out instantly by software, and for knowing a dielectric dispersion, a frequency characteristic of a capacity constituent is detected. If Q of the circuit including the specimen is insufficient, a negative resistance FDNR or a differential amplifier is added for improving Q, and the frequency characteristic can be detected with high resolution.
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