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

Seong Mo Koo, Dong Geon Jung, Young Chan Choi, Kyung Kyoo Kim, Seong Ho Kong

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish
Pages (from-to)270-274
Number of pages5
JournalJournal of Sensor Science and Technology
Volume29
Issue number4
DOIs
StatePublished - Jul 2020

Keywords

  • Auto calibration
  • Colorimetry
  • Dynamic range
  • Eutrophication
  • Feedback control
  • Optical sensor
  • ROIC
  • Silicon Photomultiplier
  • Temperature compensation

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