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Analysis of Piezoelectric Sensors in Adulteration of Bovine Milk Using the Chromatic Technique
* 1 , 1 , 1 , 2 , 1 , 3
1  Department of Electrical Engineering, São Paulo State University
2  Department of Electrical Engineering, Universidad Técnica Federico Santa María
3  Department of Chemistry, São Paulo State University


Sensors applied in the food industry are important tools to quality control. Current analyses checking adulteration in milk are expensive and time consuming, because the sample need to be evaluated in laboratory environment. Thus, is important to develop methodologies and sensors to monitoring milk production. A common type of fraud is performed adding substances such as sodium hydroxide in order to increasing milk shelf life. In this study, we propose to use low-cost piezoelectric diaphragms transducers to implement a methodology to identify milk adulteration by mechanical waves propagation method (vibration and acoustic emission). Two piezoelectric diaphragms were used, the first was excited by a chirp signal with 1 V of amplitude and a frequency band since 0 to 65 kHz with 2 Hz of step, and concomitantly was acquitted the response signal of the second sensor installed in the opposite side since the actuator with a rate of 250 kHz. After acquire the data, these were processed using the chromatic technique, which extract three features: energy, average band and equivalent bandwidth, in order to classify the raw and the contaminated milk through clustering. The experimental results indicated that the methodology can differ raw and contaminated milk with 1% of sodium hydroxide. Therefore, the results reported in this study indicate that low-cost piezoelectric diaphragms are promissory to liquids quality control.

Keywords: Piezoelectric diaphragms; low cost; bovine milk adulteration; chromatic technique
Comments on this paper
Raquell Murllio
Greatly describe
We have to find Low-Cost Piezoelectric Sensors which could be used to get splendid results in various fields we are exploring. It is easy to visit website for help in research paper online.This research paper is highlighting very remarkable achievements in this regard.