低流速热阻式流速仪

介绍了用于低流速测量的热阻式流速仪的硬件和软件的设计。通过实验验证了仪器具有较高灵敏度和精度的特点。当流体流速在15～30　cm/s时，分辨率可达0.1　cm/s.适合于河工模型试验中对流速的测量。Hot　Resistance　Mode　Instrument　For　Low　flowing　Velocity

YIN　Wei，MA　Zhi-min，CHEN　Jie，XIE　Xiao-hui

(School　of　Electronic　Information，Wuhan　University　Wuhan 430070，China)

Abstract： The　design　feature　of　the　circuit　and　the　software　of　hot　resistance　mode　flowing　velocity　instrument　were　introduced.It　can　be　used　in　measuring　low　velocity　of　water　flow.By　means　of　test，it　is　proved　that　the　instrument　makes　features　of　high　sensitity　and　high　precision. When　velocity　of　water　flow　is　from　15　to　30 cm/s，resolving　power　of　the　instrument　is　0.1　cm/s. The　instrument　can　meet　the　demands　of　measuring　velocity　of　river　engineering　mode.

Key　Words： MCU；Hot　Resistance；Velocity　of　Flow；Constant　Current