为提高平面电感式微流控检测芯片的检测精度, 研究了油样过流速度与信号幅值大小的关系。介绍了电感式微流控检测芯片的检测原理, 理论分析了油样过流速度对检测信号幅值产生的影响并进行了公式推导, 然后采用控制变量法对其进行了实验验证。选用粒径在80-85μm之间的铁颗粒作为待测颗粒, 将油样的过流速度分别设定为0.02-0.10 ml/min进行了实验。结果表明, 随着油样过流速度的增加, 信号幅值逐渐减小, 且呈线性关系; 在其余因素不变, 仅改变油样的过流速度时, 检测信号的幅值最大可增大87.5%。研究表明, 实验结果与理论推导结论相符, 通过减小油样的过流速度可增大检测信号的幅值。该项研究对提高平面电感式微流控检测芯片的精度具有参考价值。

To improve the sensitivity of a planar inductive microfluidic chip, the relationship between the oil velocity and the signal amplitude was researched. The working principle of the planar inductive microfluidic chip was introduced, the effect of the oil velocity on the detection signal amplitude was analyzed theoretically and the related formula were derived. Then, the experimental verification was performed by the control variable method. The iron particles with diameters from 80-85μm were used as the samples, the velocity of oil was set from 0.02 ml/min to 0.10 ml/min, an experiment was carried out. The obtained data illustrate that the signal amplitude decreases with the improvement of oil velocity, and the relationship between the oil velocity and signal amplitude is linear after fitting. When other conditions are invariant, the sensitivity has been significantly improved with the velocity decreased, and the maximum can catch about 87.5%.It suggests that the experiment data agree with the theoretical ones well and the signal amplitude can be improved by decreasing the oil velocity. The conclusion is valuable for the sensitivity improvement of microfluidic chips.