摘要
介绍了一种高灵敏度液面探测(LLD)系统的设计方法及其在全自动生化分析仪中的应用。系统以接触式电容法原理为核心,采用强绝缘金属双套管采样针作为探测传感器,配以基于锁相环相位比较器的电容检测电路,并结合自适应有效脉冲识别算法,实现了生化分析仪样品交叉污染率不大于0.3%和最小2μL样品时加样误差不大于±3%的性能指标。全自动生化分析仪的临床应用表明:系统具有探测灵敏度高、可靠性强和运行稳定等特点。
Design of a high sensitivity liquid level detection （LLD） system and its application in automatic biochemical analyzer is introduced. Contact capacitive method principles is regarded as core, a strong insulated metal double casing sampling needle is used as detection sensor, and a PLL phase eomparator-based capacitance detection circuit combined with adaptive recognition algorithm of effective pulses is applied in the system, as a result, a performance indicators like cross-contamination rate is not more than 0.3 % and as minimum sample is 2μL, sampling error is not more than ±3 % are achieved by the system. Automatic biochemical analyzer clinical application shows that the system has characteristics such as high detection sensitivity, reliability, operational stability, and so on.
出处
《传感器与微系统》
CSCD
北大核心
2014年第6期72-75,79,共5页
Transducer and Microsystem Technologies
基金
国家自然科学基金资助项目(61261011)
关键词
液面探测
接触式电容法
锁相环
自适应脉冲识别
全自动生化分析仪
liquid level detection （LLD）
contact capacitive method
PLL
adaptive pulse recognition
automatic biochemical analyzer
