Development of Quantitative Analytical Instrument for Colloidal Gold Strips

摘要

A novel analytical instrument for quantitative test of 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 of reflected light,and utilizes a step motor to drive detection system scanning the areas to be examined.Modulation technique for light source signals and demodulation technique for received signals are used to eliminate the interference of the background noise.The test results indicate the system has high detection accuracy with detecting errors less than 1％,and good detection stability with coefficient of variations smaller than 2％.