T4.3.1 - Free Chlorine Digitization Using Colorimetric Barcodes and Machine-Leaning Models
- Event
- EUROSENSORS XXXVII
2025-09-07 - 2025-09-10
Wroclaw - Band
- Lectures
- Chapter
- T4.3 - Novel Technologies and Applicatons of Sensors 2
- Author(s)
- M. González-Gómez, I. Benito-Altamirano, H. Lizarzaburu-Aguilar, D. Martínez-Carpena, C. Fàbrega, J. D. Prades - Universitat de Barcelona, Barcelona (Spain), I. Benito-Altamirano - Universitat Oberta de Catalunya, Barcelona (Spain), J. D. Prades - Technische Universität Braunschweig, Braunschweig (Germany)
- Pages
- 116 - 117
- DOI
- 10.5162/EUROSENSORS2025/T4.3.1
- ISBN
- 978-3-910600-07-2
- Price
- free
Abstract
The introduction of colorimetric barcodes, this is a 2D barcode which embeds a color chart, has enabled the digitization of colorimetric chemical sensors using smartphones. We applied this concept to free chlorine monitoring in water using commercial BTB and DPD reagents. Color QR Codes acted as both localization and color correction references. Images were processed through geometric normalization and nonlinear color correction. Machine learning models achieved high accuracy under real world conditions. This approach enables low cost, hardware free chlorine monitoring for on site applications.