基于霍尔效应的微小压强测量装置的设计与实现

针对化工液体的微小压强测量中所存在的测量复杂、精度低的问题,设计一种基于霍尔效应的测量流体微小压强变化的装置。该测量装置通过前端受力装置来承受液体压强的变化而产生一定的位移,并转换成霍尔电动势,经放大调理电路,最后接电压表显示相应的电压值。根据输出电压与液体压强之间的关系即可得到相应深度的压强大小。在实验中,电压表精确到1mV,最小可测量到0.792Pa的压强变化,其测量精度较高。该装置体积小、通用性强,具有较好的应用前景。

Design and Implementation of Micro Pressure Measurement Device Based on Hall Effect

For the complex measurement and low-accuracy problems of the micro pressure measurement in the chemical liquid, a micro pressure measurement device based on Hall Effect was designed.Through the front loading device to withstand the change of liquid pressure, it generates a certain displacement and converts into the Hall electromotive force, then via the amplified conditioning circuit, it shows the corresponding voltage. According to the relationship between the output voltage and the fluid pressure, we can get the pressure magnitude of the corresponding depth. In the experiment, if the voltmeter is accurate to 1mV, the minimum measurable pressure change can reach 0.792Pa, so it has higher measurement accuracy. The device is small in size,and has strong commonality and good application prospect.