温度流速計用の温度補償系のFPGA 実装

概要

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In this study, the measurement system of thermal fluids for wind tunnel experiments was developed byemploying FPGA (Field Programmable Gate Array). A thermo-anemometer consists of a hot-wire anemometerfor velocity measurement and a cold-wire thermometer for temperature measurement. The hot-wireanemometer is not able to measure velocity fields with temperature variation. Then, in the stratified flowfields, the compensation for the velocity measurement is essential. FPGA is able to configure internal circuitby program and process several tasks simultaneously. Utilizing these advantages, the temperature compensatorincorporated the temperature dependence of thermal properties was implemented on FPGA for high-accuracyvelocity measurement in wide temperature range. In the implementation of digital temperature compensationsystem for FPGA, the calculation accuracy was ensured by bitshift operation. It was evaluated that the linearityof the digital hot-wire anemometer was achieved with an uncertainty of less than ±0.45% for the meanvelocity range of 2.0m/s~5.5m/s by the wind tunnel experiments. The high-accuracy velocity measurementwas realized with an uncertainty of less than ±1.1% in temperature range of 1.5 times more than previous one.
2012-01-31