SH マイコンによる温度流速計用の遅延補償系の高性能化

概要

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The measurable velocity range of the thermo-anemometer was extended by the digital delay compensatorutilizing the Super-H microcontroller. The deterioration of the spatial resolution and the phase differencebetween temperature and velocity signals were compensated by the delay compensator, applying Taylor'sfrozen turbulence hypothesis. The delay compensator employing the single-chip microcontroller (SH-2A) wasapplicable to the flow fields with the velocity range of 0.01 ~ 50m/s. The degradation of gain for thefluctuation components up to 5kHz was suppressed within 1.7%, hence the developed compensator involvedthe sufficient frequency response to apply as turbulence measurements. The error of the phase differencecaused by the uncertainty of the delay time in the compensated temperature signal was confirmed less than±1.0%. The present compensator was realized the reduction of electrical noise and the extending of theapplicable velocity range in comparison with the previous one. The results of the dynamic characteristicevaluation denoted that the accurate delay compensation was realized on the flow fields with the velocityrange of 1.6 ~ 15m/s without recalibrating.
2011-01-31