MEASURING APPARATUS OF GAS-LIQUID TWO PHASE FLOW

摘要

PURPOSE:To measure the speed, diameter etc. of an air bubble at the same time, by detecting the variation of a reflection state at the tip end of an optical fiber at the time of penetrating the tip end of the optical fiber inserted into a gas-liquid two phases flow into the bubble as the intensity variation of reflected light and Doppler shift. CONSTITUTION:Light having a single oscillation frequency and single polarized light face from a light source 4 is made incident to an optical fiber 1 passing through a beam splitter 5 and a focusing lens 6. A tip face 7a of a focusing lens 7 of the tip end of the fiber 1 is inserted into a gas-liquid two phase flow perpendicularly to a flow direction. The light returning from the fiber 1 is divided by the splitter 5 and is converted into an electric signal by a photoelectric converter 8. Beat part of a reflected wave by the face 7a and a reflected wave by the surface of a bubble is taken out by a by-pass filter 9 and the signal expressing the necessary time of penetration of the bubble is taken out by a low- pass filter 10. The speed and diameter etc. of the air bubble are calculated by a signal processing circuit 13.