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Sensors 2018, 18(12), 4323; https://doi.org/10.3390/s18124323

Research on the Temperature Characteristics of the Photoacoustic Sensor of Glucose Solution

Department of Instrument Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Rd., Shanghai 200240, China
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Received: 11 October 2018 / Revised: 5 December 2018 / Accepted: 6 December 2018 / Published: 7 December 2018
(This article belongs to the Special Issue Non-Invasive Biomedical Sensors)
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Abstract

In order to weaken the influence of temperature on photoacoustic (PA) measurements and compensate PA signals with a proposed theoretical model, the relationship of PA signal amplitude with temperature, under the condition of different glucose concentrations and different light intensities, was studied in this paper. First, the theoretical model was derived from the theory of the PA effect. Then, the temperature characteristics of the PA signals were investigated, based on the analyses of the temperature-dependent Grüneisen parameter in glucose solution. Next, the concept of a PA temperature coefficient was proposed in this paper. The result of the theoretical analysis shows that this coefficient is linear to light intensity and irrelevant to the concentration of glucose solution. Furthermore, a new concept of a PA temperature coefficient of unit light intensity was proposed in this paper. This coefficient is approximately constant, with different light intensities and solution concentrations, which is similar to the thermal expansion coefficient. After calculation, the PA temperature coefficient by the unit light intensity of glucose solution is about 0.936 bar/K. Finally, relevant experiments were carried out to verify the theoretical analysis, and the PA temperature coefficient of the unit light intensity of glucose solution is about 0.04/°C. This method can also be used in sensors measuring concentrations in other aqueous solutions. View Full-Text
Keywords: photoacoustic sensor; glucose solution; temperature coefficient; Grüneisen parameter photoacoustic sensor; glucose solution; temperature coefficient; Grüneisen parameter
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Tao, W.; Lu, Z.; He, Q.; Lv, P.; Wang, Q.; Zhao, H. Research on the Temperature Characteristics of the Photoacoustic Sensor of Glucose Solution. Sensors 2018, 18, 4323.

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