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http://dx.doi.org/10.46670/JSST.2020.29.4.270

Read-Out Integrated Circuit of Colorimetry-Based Optical Sensor for Eutrophication Analysis  

Koo, Seong Mo (School of Electronics Engineering College of IT Engineering)
Jung, Dong Geon (School of Electronics Engineering College of IT Engineering)
Choi, Young Chan (School of Electronics Engineering College of IT Engineering)
Kim, Kyung-Kyoo (HuStar ICT Innovation Uviversity Agency)
Kong, Seong Ho (School of Electronics Engineering College of IT Engineering)
Publication Information
Journal of Sensor Science and Technology / v.29, no.4, 2020 , pp. 270-274 More about this Journal
Abstract
In this study, a read-out integrated circuit (ROIC) that can be applied to a colorimetry-based optical sensor for analyzing total phosphorus and total nitrogen was developed and characterized. The proposed ROIC minimizes the effect on temperature fluctuation, improves sensitivity, and extends the dynamic range by utilizing a dual optical path and feedback control circuit. Using a dual optical path makes it possible to calibrate the output signal of the optical sensor automatically, along with the temperature fluctuation. The calibrated voltage is fed back into the measurement stage; thus, the output current of the measurement is adaptively controlled. As a result, the sensitivity and dynamic range of the proposed ROIC are improved. Finally, a total-phosphorus analysis was conducted by utilizing the ROIC. The ROIC was found to operate stably over a wide temperature range.
Keywords
Colorimetry; Optical sensor; ROIC; Eutrophication; Feedback control; Temperature compensation; Auto calibration; Dynamic range; Silicon Photomultiplier;
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