基于光源调制技术的金标试纸条定量分析仪器

Quantitative analytical instrument for colloidal gold strips based on light source modulation technique

基于光电检测原理,研发了一套可用于金标免疫试纸条定量检测的分析仪器。采用绿光发光二极管(LED)作为发射光源,以光电二极管接收试纸条反射光,并通过步进电机带动检测系统扫描试纸条待检区域。系统采用光源信号的调制与接收信号的解调技术,以消除环境干扰噪声。实验结果表明,该仪器检测结果准确,与真实值之间误差<1%;稳定性高,变异系数CV<2%。

A novel analytical instrument for quantitative testing colloidal gold strips is developed based on the principle of photoelectric detection. The test-strip analytical instrument uses green LEDs as the emitting light source and a photodiode as the receiving device for obtaining reflected light, and utilizes a step motor to drive detection system for scanning the examining areas. Modulation technique for light source signals and demodulation technique for receipt signals are used to eliminate the interference of the background noise. The test results indicate the system has high detection veracity rates with detecting errors less than 1%. and good detection stability with coefficient variables less than 2%.