Abstract
It is essential to determine whether the food produced for commercialization is genuine and of good quality to protect consumer rights. Black pepper is one of the most common spices and its quality and price differ based on geographical origin (geo-origin). This paper reports the employment of temperature modulation in an array of metal oxide semiconductor (MOS) gas sensors to improve their accuracy and robustness in profiling black pepper volatile organic compounds (VOCs) by geographical origin. The sensor temperature was adjusted by varying the sensor heater voltage (3, 4 and 5 V). It was observed that the same black pepper sample showed varying MOS gas sensor responses magnitude and ratio for different sensor heater voltages. Employing principal component analysis (PCA) demonstrated different sample PCA scores distribution when sensor heater voltage was varied, which was further verified by varying the classification accuracy from classification models training. The result in this preliminary study had proven that variation of MOS gas sensor responses pattern through temperature modulation could lead to increase in black pepper sample data dimensionality, hence better geo-tracing result.
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The authors would like to express their deepest gratitude to the Malaysian Pepper Board for providing the black pepper samples.
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Pui, Y.J., Lee, H.E., Mercer, Z.J.A., Ng, S.M., Chua, H.S. (2023). Temperature Modulation of Metal Oxide Semiconductor Gas Sensors for Black Pepper Geo-Tracing. In: Choo, C.S., Wong, B.T., Sharkawi, K.H.B., Kong, D. (eds) Proceedings of ASEAN-Australian Engineering Congress (AAEC2022). AAEC 2022. Lecture Notes in Electrical Engineering, vol 1072. Springer, Singapore. https://doi.org/10.1007/978-981-99-5547-3_6
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DOI: https://doi.org/10.1007/978-981-99-5547-3_6
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