摘要
在生化分析二点法、速率法中,试剂加入样品后的反应过程是在比色杯中完成的,该反应过程对温度极其敏感,能否按要求准确控制反应液的温度,直接影响检测结果的可信度。由于反应液与比色杯有迅速的热交换,实际是通过控制比色杯的温度来达到控制反应液温度。为了实现反应杯温度的快速、精确检测与控制,系统硬件采用高精度铂电阻作为测温元件,DSP作为控制器,半导体制冷片作为温度调节器,软件采用PID控制算法。实验结果表明,比色杯温度控制精度达到±0.1℃,控制时间小于30s,满足生化分析仪的设计要求。
In two-point and velocity methods in biochemical analysis,the reaction is accomplished in a cuvette when the reagent is added into the sample.The reaction is so susceptible to temperature that temperature control becomes a key factor to the reliability of the measurement.By using the exchange of heat between reaction liquid and cuvette,system actu-ally controls the cuvette temperature instead of the reaction liquid temperature.In order to fulfill quick and accurate tempera-ture control,system takes high-precision platinum resistance as the temperature sensor,DSP as the controller and semicon-ductor Pehier as heat interchanger.PID is adopted as the software Algorithm.From the result of operation,the precision of cuvette temperature control has achieved ±0.1℃ within 30 seconds,which has satisfied the design requirement.
出处
《电子测量与仪器学报》
CSCD
2011年第4期360-365,共6页
Journal of Electronic Measurement and Instrumentation
关键词
生化分析仪
DSP
PID算法
温控精度
biochemical analyzer
DSP
PID algorithm
temperature precision
