# Development Trend of Electronic Nose Technology in Closed Cabins Gas Detection: A Review
###### Abstract  
Gas detection in enclosed cabins is a challenging concern in the industry to ensure the safety of cabin operations and personnel driving. There has been a growing development in the detection of safety in enclosed cabin operations based on volatile organic compounds, which have unique characteristics. The air pollution in closed cabins seriously affects the driver's health, and the accuracy of the detection directly affects the operation safety of the cabin. However, until today, gas detection in enclosed cabins has relied on traditional methods that are expensive and time-consuming, and it cannot be detected in real time. This paper focuses on the potential and capability of electronic nose applications for gas detection in enclosed cabins. Since the electronic nose is a good substitute for the closed cabin, people's attention to it has increased greatly. The characteristics of hazardous gas and warning gas in closed cabins are also discussed. In addition, this paper provides important insights into the challenges and future trends of the electronic nose, a low-cost, high-precision, and fast detection method, in more applications in closed compartments. electronic nose; closed cabins; sensor array +
Footnote †: journal: Medical and Aerospace Engineering, Jilin University, Changchun 130022, China  
Footnote †: journal: Medical and Aerospace Engineering, Jilin University, Changchun 13002, China
detection equipment [3; 4]. The need for rapid and accurate quality testing of air in enclosed cabins has been increasing. In this sense, the electronic nose, as an olfactory standard indicator with certain professionalism and timeliness and which can mimic the human nose, becomes a standard indicator that balances professionalism and comfort [5]. The electronic nose is a professional and comfortable, sensing tool to replace the traditional methods. The arrival of electronic noses has provided a new option for researchers as well as manufacturers. While traditional detection methods are highly dependent on manual labor and laboratories, electronic noses allow for fast and real-time detection of gases in closed cabins. The electronic nose can analyze the data through multivariate analysis methods and easily distinguish anomalous emission gas deviation samples [6]. In addition, the e-nose can identify the gas from a closed cabin. In addition to this, the e-nose can identify the source of VOCs emissions released in gaseous form from inside closed cabins. It also offers a large number of benefits, starting from the processing phase of various parts in closed cabins up to the calibration phase, producing reliable data and results. In addition to enclosed cabins, electronic noses are used in food [7], medical [8], environmental monitoring [9], agriculture [10], and various other fields have many advantages and have contributed to various industries. Electronic nose technology was introduced in 1982 and started to be used for food identification, and then gradually applied to other fields, and has undergone a great change from technology to market, the development process of electronic nose is shown in Figure 1.  
An electronic nose by designing sensing arrays [11] with recognition methods [12] to distinguish complex odors. A common electronic nose has three important components, namely a gas sensor array, an analog-to-digital converter, and a computer that can run a recognition model [13]. The computer can run the recognition model. As we know from the extensive published literature, electronic noses are compatible with human olfactory and sensory analysis [14; 15]. It is a gas sensing device with great potential. Therefore, this paper reviews the basic principles of electronic nose and the detection of volatile gases in closed cabins. In the future development, this gas detection method can be widely used in closed cabins to cope with different gas detection needs.