Portable image-based detection system for Upconverting phosphor immune lateral flow assay

Conference: BIBE 2019 - The Third International Conference on Biological Information and Biomedical Engineering
06/20/2019 - 06/22/2019 at Hangzhou, China

Proceedings: BIBE 2019

Pages: 7Language: englishTyp: PDF

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Li, Chao; Chen, Meng; Cheng, Zhi; Chen, Feng; Wu, Taihu; Du, Yaohua (Institute of Medical Equipment, Academy of Military Medical Sciences, Tianjin, China)

A portable image-based detection system for Up-converting phosphor immune lateral flow assay is introduced. A commecial low light level CMOS sensor is chosen as the detector, which is low cost. The excitation light source is a 980nm and 500mw laser diode. In order to minish the error induced by the un-uniformity of laser irradiation, a diffuser is inserted into the beam and a calibration algorithm is developed. The residual error from the un-uniformity irradiation is less than 1%. Benefit from the adjustable of the exposure time, the integrated dynamic range of the system is as high as 106dB. The repeat test error for the very low signal is 1% (variation coefficient). And the linear correlation coefficient between the tested T/C value and sample concentration is 0.998. Compared to the traditional instrument, the detection system is static, low cost, portable and high-precision.