Milk Fat Fiber-Optic Sensor Based on the Photoluminescence Spectroscopy

Abstract

A prototype of the small-sized fiber-optic sensor was developed to determine the fat component percentage in milk. The sensor operation principle was based on the photoluminescence spectroscopy using a fiber-optic system based on the scheme of branching in the two optical channels to deliver pump radiation and receive the fluorescent signal. Milk fluorescence was excited by irradiation from the UV diode laser with the wavelength of 369 nm. Pump radiation was introduced into the milk tube by the multimode optical fiber with the core diameter of 50 µm, which was also used to detect the fluorescence radiation. The fluorescence spectrum was registered using the fiber-optic mini-spectrometer operating in the range of 370--800 nm. Based on the experimentally measured fluorescence spectra for milk samples with the different fat content, it was found that intensities of the cow milk two fluorescence peaks at the wave-lengths of 390 and 780 nm exhibited monotonic dependence on the fat percentage in milk. Dependences of the fluorescence maxima intensity on the milk fat content in the range 0.05--6 % were plotted. Functional approximations were found for the obtained dependencies, they could be used to calibrate the sensor

The work was supported by the Russian Science Foundation (grant no. 23-26-00110, https://rscf.ru/project/23-26-00110/)

Please cite this article in English as:

Shkirin A.V., Kozlov V.A., Ignatenko D.N., et al. Milk fat fiber-optic sensor based on the photoluminescence spectroscopy. Herald of the Bauman Moscow State Technical University, Series Natural Sciences, 2024, no. 1 (112), pp. 93--103 (in Russ.). EDN: DTQUFX

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