A Logical Discrimination Method

In order to obtain the instantaneous particle velocity directly from the signals of the reflected light of the probe for particle velocity measurement, Qin and Liu (1982) proposed a method to acquire the instantaneous particle velocity distribution with a logic discrimination method. 

FIGURE 4-34 Example of a standard particle signal versus time. 

FIGURE 4-35 Block diagram of five-fiber optic probe measuring system. 

FIGURE 4-36 Schematic of the logic distribution functions of the five-fiber measuring system. 

FIGURE 4-37 Typical particle velocity distribution as measured by a five-fiber optic probe (Sand, dp of 150 im, by free fall system). 

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