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A New Method for Total Fat Detection in Raw Milk Based on Dual Low-Coherence Interferometer

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Facultad de Ingeniería Campus Amazcala, Universidad Autónoma de Querétaro, Carr. Chichimequillas S/N Km 1, Amazcala, El Marqués, Querétaro 76265, Mexico
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Departamento de Electrónica, División de Ingenierías, Campus Irapuato-Salamanca, Universidad de Guanajuato, Carretera Salamanca-Valle de Santiago Km. 3.5+1.8 Comunidad de Palo Blanco, Salamanca, Guanajuato 36787, Mexico
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Authors to whom correspondence should be addressed.
Sensors 2019, 19(20), 4562; https://doi.org/10.3390/s19204562
Received: 4 September 2019 / Revised: 5 October 2019 / Accepted: 17 October 2019 / Published: 20 October 2019
(This article belongs to the Section Physical Sensors)
The present work experimentally demonstrates a multimode fiber optic sensing setup for total fat detection in raw milk samples. The optical fiber arrangement incorporates a low-coherence Fabry–Perot cavity operating in dual response. The system provides a phase modulation for a total fat range from 0.97 to 4.36%. Here, the protein remains constant at ≈3%. The data indicate that maximum sensitivity close to 616 pm/%fat could be achieved at optimal wavelength operation (500 nm). In addition, the system presented a minimal repeatability error measurement of 0.08%, cross-sensitivity between protein and fat of 0.134, and a regression coefficient of r 2 = 0.9763 . A thermal analysis was also performed, which indicate the temperature immunity of the system. The proposed method represents a low-cost alternative to detect minimal fat variations in raw cow milk. View Full-Text
Keywords: optical fat sensor; Fabry–Perot interferometer; raw milk; phase modulation optical fat sensor; Fabry–Perot interferometer; raw milk; phase modulation
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Gastélum-Barrios, A.; Soto-Zarazúa, G.M.; García-Trejo, J.F.; Sierra-Hernandez, J.M.; Jauregui-Vazquez, D. A New Method for Total Fat Detection in Raw Milk Based on Dual Low-Coherence Interferometer. Sensors 2019, 19, 4562.

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