Optical testing the compliance with regulatory standards of urea concentration in AdBlue®

Carlo Anelli, Vanessa Pellicorio, Valentina Bello, Sabina Merlo

Abstract

This paper presents an absorption-based optical approach to check the compliance of urea concentration in AdBlue® with regulatory standards. The implemented low-cost and compact measuring system exploits two LEDs that emit in the SWIR spectral band, a glass capillary, and an amplified photodiode to detect the intensity of the radiation transmitted through the fluid under test. The functionality of the system has been demonstrated on urea–water solutions with urea concentrations from 0 up to 525 mg/mL. Thanks to the attained calibration curve, we retrieved the urea concentration of different AdBlue® samples, found in agreement with HPLC results. The proposed optical method allows to easily verify if the estimated urea concentration falls within the required range for AdBlue®.

Download

IMEKO-TC2-2025-020.pdf

DOI

10.21014/tc2-2025.020

IMEKO TC

TC2 - Photonics

Back to the proceedings