Design of Non-contact Measurement of Alcohol Concentration Based on the Lambert-beer Law

Miao Tang; Xin Wen; Qiuxin Yang; Shenhong Xia; Yiwen Luo

doi:10.54097/qtfsxr74

Authors

Miao Tang
Xin Wen
Qiuxin Yang
Shenhong Xia
Yiwen Luo

DOI:

https://doi.org/10.54097/qtfsxr74

Keywords:

Alcohol Concentration, Non-contact, Spectral Analysis, Lambert-beer Law

Abstract

This paper is based on the lambert-beer law, measuring the transmission rate of infrared light through alcohol to determine its concentration in a non-contact manner. Compared to traditional measurement methods, non-contact measurement minimizes the risk of alcohol contamination, while being simple and efficient. The design section includes mechanical structure, sensor filtering and sampling circuits, main control systems, and human-computer interaction programs. A high-order fitting algorithm was employed to establish a mathematical model relating alcohol concentration to voltage values, followed by data processing of the measured voltage values for different alcohol concentrations. Using this model, the corresponding alcohol concentrations were obtained. The relative error between measured values and calibrated values was found to be within 2.12%, demonstrating the accuracy of the experimental apparatus. Additionally, to address the impact of temperature variations on voltage values, a water calibration method was implemented to further reduce experimental errors. This achieved high-precision measurement of alcohol concentration and validated the rationality of the experimental system design.

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