Infrared spectroscopy can provide fingerprints of most molecular compounds, which is widely used for detection of solid, liquid, and gas components with the advantages of fast response, high sensitivity, and specificity. However, Fourier transform infrared spectroscopy (FTIR) system has a large size and is heavy in quality, which limits its potential for onsite detection applications. With the development of materials and technology, quantum cascade laser (QCL), as a kind of infrared coherent light source, has gradually appeared on the market, which provides the possibility to design a portable infrared spectroscopy system with the features of light weight and low cost. Therefore, based on the miniaturized QCL and infrared detector, we designed a portable infrared spectroscopy detection system with a bandwidth of 200 cm-1 (1168- 952 cm-1) in this paper. We successfully detected the infrared absorption characteristic peak of ethanol gas at 1060 cm-1 with this system, which verified its feasibility for detecting infrared spectroscopy of molecular compounds.
Many volatile organic compounds (VOCs) will be released in the process of food deterioration. These VOCs are closely related to the physical and chemical properties of the food. Its rapid detection is important to the assessment of food quality and safety. Traditional analytical methods based on chromatography-mass spectrometry have excellent detection limits and accuracy, but their sampling and pretreatment lead to time-consuming, and cannot quickly detect food VOCs. This article uses tunable diode laser absorption spectroscopy (TDLAS) technology to explore a rapid detection method for fo od spoilage based on VOCs. In this paper, a spectral absorption peak caused by ammonia gas released from spoiled beef is successfully detected, and its amplitude increases with the deterioration of beef. This study demonstrates that food spoilage can be identified using VOCs based on laser spectroscopy.
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