| 摘要 |
PURPOSE:To obtain a method and a device for controlling the contact interface position of a pressure vessel, which can maintain the height of the contact interface between the fluid to be treated and the supercritical fluid inside of the pressure vessel constant. CONSTITUTION:A laser beam at a width of X is made incident upon the fluid 27 to be treated and the supercritical fluid 28 to measure damping factors A, B of the laser beam, which is transmitted through the fluid 27 to be treated and the supercritical fluid 28. Next, a damping factor C1 of the laser beam at the time when the laser beam is made incident upon the fluid 27 to be treated or the super critical fluid 28 at a desired position is measured. A reference value C2 of the damping factor C1 in the case where the existence of the contact interface at a reference position separated from the upper end of the laser beam, which is positioned at a desired position, with a distance Y in the vertical direction is assumed is computed with an equation (1). In the case where the damping factor C1 is smaller than the reference value C2, supply quantity of the fluid 27 to be treated is made excessive, and in the case where the damping factor C1 is larger than the reference value C2, discharge quantity is made excessive to maintain the contact interface at the reference position. Reference value C2=A(1-Y/X)+B(Y/X)...(1). |
