In the current wave of industrial intelligence, industrial sensors, as key components for obtaining information, play a crucial role like the "nerve endings" of industrial systems. It is not only the cornerstone of industrial automation and intelligence, but also the core force driving the development of Industry 4.0.

The characterization of volatile organic compounds (VOCs) plays a crucial role in environmental diagnostics, biomedical and food science. For example, microbial reactions between microorganisms and food can produce various VOC biomarkers, paving the way for promising methods to quantify food freshness. Triethylamine (TEA) is one of the most representative biomarkers, and its concentration increases as protein degradation progresses during meat spoilage. However, achieving high-sensitivity real-time monitoring of TEA remains a huge challenge, limiting personalized food freshness recognition.

Geological disasters, such as landslides, mudslides, earthquakes, etc., often occur suddenly and bring heavy blows to human society. These disasters not only consume lives and destroy homes, but also cause serious damage to infrastructure and hinder socio-economic development. In order to effectively prevent geological disasters and reduce their losses, accurate monitoring is crucial, and sensors play an irreplaceable key role in it.

Environmental pollutants mainly include pesticides, heavy metals, microplastics, and harmful microorganisms, which mainly come from industrial and agricultural production activities and pose a threat to the ecological environment and human health. To effectively manage environmental pollutants, it is necessary to accurately detect and quantify their levels in the corresponding environmental media. Currently, various digital on-site real-time monitoring technologies based on sensors and probes are effective means of identifying environmental pollutants.

This work proposes a simple and universal strategy, which involves coating an acidic protonated ZSM-5 (HZSM-5) coating layer to eliminate ethanol inhibition without affecting the inherent sensing performance. The HZSM-5 coating deposited on the oxide sensor exhibits excellent detection performance. Even at trace concentrations, formaldehyde (HCHO) can have harmful effects on human health. It can effectively eliminate ethanol interference without changing the response or response time of HCHO.

In today's rapidly developing technology, sensors, as key components for obtaining information, are widely used in various fields. Eddy current sensors play an important role in industrial production, scientific research experiments, and other fields due to their unique advantages. So, what are the testing methods for eddy current sensors? Let's unveil its mysterious veil together.