CAJ | 학술논문

为实现全自动凝血分析仪加样过程高灵敏度和高精度的液位检测，采用了电容传感器原理和步进电机运动控制相结合的方法。介绍了探针式电容传感器的结构与工作原理；分析了电容/周期转换法的检测原理；组建了实验系统对灵敏度和测量精度进行检测。实验结果表明：加样针接触液面的瞬间，脉冲周期发生40%左右的显著变化，液位测量的标准差为4.1μm。
위실현전자동응혈분석의가양과정고령민도화고정도적액위검측，채용료전용전감기원리화보진전궤운동공제상결합적방법。개소료탐침식전용전감기적결구여공작원리；분석료전용/주기전환법적검측원리；조건료실험계통대령민도화측량정도진행검측。실험결과표명：가양침접촉액면적순간，맥충주기발생40%좌우적현저변화，액위측량적표준차위4.1μm。
To achieve high sensitivity and high precision liquid level detection on pipetting process of automatic coagulation analyzer,a capacitive sensor principle combined with stepper motor motion control method is used. Structure and working principle of probe-type capacitive sensor are introduced;detecting principle of C/T conversion method is analyzed;an experiment system is set up to test sensitivity and precision. Results show that the change of pulse period reach to around 40% at the moment while pipette is contacting liquid surface,the standard deviation is 4. 1μm.