摘要
介绍一种用于检测农药残留的量热式生物传感器的半导体恒温仪的研制。该恒温仪基于塞贝尔效应,利用半导体制冷进行恒温。该仪器由恒温器与控制器部分组成。针对量热式生物传感器的参比法测量及流动分析的特点,恒温器采用相同结构参数的双流路对称布置。液体由流路下部流入,保证换热充分。控制器采用铂电阻采集温度信号,由智能调节器进行温度监控。可控温度范围由0～70℃;升降温时间短,不超过3min,控温精度小于±0 1℃。通过实验,恒温仪的恒温效果良好,控温精度高,符合检测要求。
The semiconductor thermostat used in the rapid thermal detector of pesticides was studied.Based on the theory of the Peltier effect,semiconductor refrigeration is used to keep the constant temperature.This instrument consists of a thermostat and a controller.The thermostat is disposed symmetrically by two same flow ways aiming at the character of the biosensor:the referential means and the flow injection analysis.Fluid is flowed in the flow way from the bottom in order to exchange heat sufficiently.The temperature is inspected and controlled by an intelligent adjuster.The range of the adjusted temperature is 0～70 ℃.And the time of the temperature adjustment is less than 3 minutes.The precision of the temperature control is ±0.1 ℃.By experiments,the constant temperature performance and the precision of the temperature control are good,which is accord with the requestment.
出处
《仪表技术与传感器》
CSCD
北大核心
2004年第9期18-20,共3页
Instrument Technique and Sensor
基金
国家自然科学基金会项目(50176032)
