具有温度补偿的小型生化分析仪温度控制系统的研究

Study of the Temperature-Controlling System for Mini-Clinical Biochemical Analyzer Capable of Temperature Compensation

小型生化分析仪的温度控制系统大多采用固体直热恒温系统。固体直热恒温系统采用加热片直接对反应盘加热,通过热传导对反应杯中的反应液加热,使其达到特定的反应温度。但是随着环境温度的改变,反应液会偏离特定的反应温度,影响生化测试结果精度。因此,温度控制系统需要对环境的影响进行补偿,使得反应液稳定在其特定的温度。本系统通过改变反应盘的温度来补偿环境温度的影响。实验证明,本论文提出的补偿方法能使反应液温度控制在37℃,其正确度为±0.3℃,波动±0.1℃,完全满足生化分析对恒温系统的要求。

Mini-clinical biochemical analyzer usually uses dry bath temperature controlling system, where the container of reaction cup is heated directly by heater and the liquid sample is heated through thermal conductivity, thus the liquid sample will maintain at target temperature. If ambient temperature changes the temperature of the liquid sample will deviate from the target temperature and this is not good for biochemical measurement. Therefore, it is necessary to compensate the influence of ambient temperature actively. The temperature controlling system in the paper changed the temperature of the container actively to compensate this influence. The experiments showed that the temperature of liquid sample was 37℃,and it＇s correctness was ±0. 3℃and it＇s fluctuation was ±0. 1℃, and this method was available for the miniclinical biochemical analyzer.