Design and implementation of measurement system for milk fat content based on optical fiber sensor

摘要

The aim of this paper is to design an optical fiber sensing system for determination of fat content in milk. The measurement system is composed of light source, Y-type optical fiber, photodetector, thermoelectric cooler (TEC), preamplifier, second-level amplifier, A/D converter, microprocessor, data storage module, data display and key module. According to Mie light scattering theory, absorbency is adopted as the optical parameter representing the milk fat content; Homogenization is realized by TEC to ensure that the scattering coefficient keeps invariant; Based on the standard model of the system established beforehand, the processor can calculate the fat content in milk. Through calibration and prediction, we can choose the best testing temperature. Results of this study indicate the feasibility and real-time performance of using this measurement system for milk fat analysis.