| 摘要 |
PURPOSE:To eliminate the influence from being exercised on a change in specific resistance of suspension due to a temperature change, by a method wherein a constant current is flowed to an inner and an outer electrode to find a ratio of a crest value of a pulse to a DC voltage component. CONSTITUTION:An outer electrode 4 is placed in suspension, and a change in electric resistance between an inner electrode 3 and the electrode 4 when a particulate (b) to pass through a pore 1 is fetched as an electric pulse. A constant- current device 7, supplying a DC constant current to the outer electrode 4 through the pore 1, an AC amplifier 8 for amplifying only a pulse generated at the inner electrode 3, and a buffer amplifier 9 for fetching only a voltage generated at the inner electrode 3 are connected to the inner electrode 3. A low- pass filter 10 for fetching only a DC component is connected to the buffer amplifier 9, and is inputted to an analogue divider 11 together with the AC amplifier 8. This obtains a pulse voltage which does not depend on a specific resistance of suspension (a), and causes measuring of a reliable volume of a particulate without being influenced by a temperature change. |
