A fluorescent sensor with a separation mechanism for exciting light

C. F. Lin, H. H. Tsai, Y. Z. Juang, R. L. Wang, H. W. Chu, M. J. Syu, Z. K. Lin

Research output: Chapter in Book/Report/Conference proceedingConference contribution


In this paper, a fluorescent sensor for fluorescence immunoassay is presented. The assembled structure separates the path of emitted fluorescence from that of exciting light, hence the fluorescence is shined upon an N-Well/P-sub silicon photodiode and the exciting light is directed away from the photodiode. The N-Well/P-sub silicon photodiode has a metal mesh pattern which can suppress the incidence of long-wavelength light, such as infra-red light, into the photodiode and reduce dark current resulting from environmental long-wavelength light. The dark current is about 10pA. In this work, a read-out circuit of current-controlled oscillator using photo-current to control its oscillation frequency was designed to measure the fluorescent intensity. In the circuit, the output oscillation frequency is a linear function of fluorescent intensity. The experiment results show that the green fluorescent intensity can be measured with a good linearity of 99.2%.

Original languageEnglish
Title of host publicationIEEE SENSORS 2012 - Proceedings
Publication statusPublished - 2012
Event11th IEEE SENSORS 2012 Conference - Taipei, Taiwan
Duration: 2012 Oct 282012 Oct 31

Publication series

NameProceedings of IEEE Sensors


Other11th IEEE SENSORS 2012 Conference

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering


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