CAJ | 학술논문

针对高速医疗检测仪器对高灵敏和较强自适应能力的需求，提出一种基于 PLL 的自校准液面检测系统设计。该设计首先通过 PLL 电路将探针电容的变化转换为电压的变化，然后采用自校准算法调节 PLL 芯片 VCIN 的静态工作电压，最后结合自适应检测算法实现液面检测功能。实验表明，该液面检测系统中MCU输出的液面检测信号与检测电路产生的输出信号之间的延迟约为1.6 ms；同时能兼容样本针与试剂针液面检测系统，且所有探针的插入液面深度最大误差仅为0.37 mm，满足全自动生化分析仪的临床检验要求。
침대고속의료검측의기대고령민화교강자괄응능력적수구，제출일충기우 PLL 적자교준액면검측계통설계。해설계수선통과 PLL 전로장탐침전용적변화전환위전압적변화，연후채용자교준산법조절 PLL 심편 VCIN 적정태공작전압，최후결합자괄응검측산법실현액면검측공능。실험표명，해액면검측계통중MCU수출적액면검측신호여검측전로산생적수출신호지간적연지약위1.6 ms；동시능겸용양본침여시제침액면검측계통，차소유탐침적삽입액면심도최대오차부위0.37 mm，만족전자동생화분석의적림상검험요구。
The high-speed medical testing equipment requires highly sensitive and strong self-adaptive capabilities. A PLL-based self-calibration liquid level detection system is proposed. The design uses a PLL circuit to convert the change of probe′s capacitance to the change of voltage, and then adopts a self-calibration algorithm to adjust PLL chip′s VCIN quiescent voltage, finally combines adaptive detection algorithm to accomplish liquid level detection. Experimental results show that the delay between the liquid level detecting signal generated by MCU and the output signal of the detecting circuit is about 1.6 ms. While the liquid level detection system can be designed to be compatible with sample probe and reagent probe , and the maximum error of the insertion depth under the liquid is only 0.37 mm, which could satisfy the clinical inspection requirements of the automatic biochemical analyzer.