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A new noncontacting method (SCB method) to measure simultaneously the time averaged local values of the characteristic parameters such as the size, velocity and passing frequency (or void fraction) of the dispersed phase, i. e., solid particles or gas bubbles in a gas-solid, gas-liquid or solid-liquid two-phase flow is proposed. Two laser beams are used as a detector. They are arranged so as to be crossed at right angles with each other with one beam being shifted at a small distance in a direction of flow. The auto-correlation of the output signal from the upstream beam and the cross-correlation between the upstream and downstream beam are calculated to determine the characteristic parameters. The SCB method was experimentally examined by using spherical particles with a known equal diameter. The characteristic parameters measured by the SCB method agreed well with those values obtained by other conventional methods.

A Shifted-Cross-Beam Method (SCB-Method) for the Measurement of the Local Values of the Characteristic Parameters in a Dispersed Two-Phase Flow