Minisystem for monitoring water quality using UV absorption and fluorescence

Abstract

This study proposes a modular optoelectronic detection platform for water quality monitoring in the desalination process that integrates UV-visible absorption and fluorescence detection. The system uses a optical cavity optimized by Zemax and modular mechanical components designed in Solidworks, and achieves theoretically simulated light collection efficiency through parametric lens configuration analysis. A hybrid signal conditioning architecture combining differential amplification and lock-in amplifier was developed, and the circuit performance was verified through Multisim simulation. An embedded system built on an ESP32 microcontroller implements multi-channel data acquisition and Bluetooth Low Energy transmission, but complete experimental verification remains to be completed. This work establishes a methodological framework for the integration of low-intensity optical detection systems, laying the foundation for subsequent performance characterization and field deployment.