| 摘要 |
PROBLEM TO BE SOLVED: To determinate the velocity of flow of air or other fluid by a plurality of the detectors, which are provided so as to leave an interval in the direction parallel to the flow direction of air, of an optical flowmeter. SOLUTION: Laser beam is transmitted so as to traverse the flow of air to impinge against the detectors. Scintilation generated in the flow of air by the vortex and fine particles in air is detected by all of the detectors but, since the detectors are longitudinally separated in the flow direction of air, the scintilation is detected in slightly different timings. The output signals of the detectors are adjusted, amplified and converted to be brought to a digital form. Next, the analysis of temporal interrelation is performed on the signals digitalized in a digital signal processor. Next, time lag between the signals from the different detectors is electronically calculated. Next, the velocity of flow of air is judged by dividing the time lag detected with respect to the same scintilation by the respective detectors by the separation distance between the detectors.
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