| 摘要 |
PURPOSE:To easily measure the concentration of a contained particle by constituting the titled device so that a voltage is applied to a conductor for forming a collecting electrode, a current is allowed to flow and the particle concentration is measured by a variation quantity of the current, and also, the adhering particle is burned and removed. CONSTITUTION:Between a discharge electrode 1 being a cathode and a collecting electrode 2 being an anode, a high DC voltage is applied, a corona discharge is executed by applying a high voltage electrostatic field to sample gas, gas in the vicinity of the discharge electrode 1 is converted to a corona and a particle is electrified to negative, by which the particle is allowed to adhere to the collecting electrode 2. Thereafter, a conductor 4 being parallel to the collecting electrode 2 is connected to a power source 7 through changeover switch mechanisms 5, 6, and the concentration of an adhering particle is measured. In this case, if the adhesion quantity of the particle exceeds some extent, the measurement becomes impossible, therefore, a current is fed to the conductor 4 from a power source 8 and it is burned in red heat and regenerated. In such a way, the concentration is measured from a ratio of the variation quantity of the current per unit time.
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