The development process of airport security products, from the primitive mode of manual search to the comprehensive coverage of intelligent devices, is a vivid reflection of the continuous upgrading of the aviation security guarantee system. As the core defense line for safeguarding air transportation safety, every iteration of security inspection products resonates with the needs of air defense safety. Driven by technological innovation, it has gradually achieved a leap from "passive defense" to "active warning", and from "inefficient and cumbersome" to "efficient and convenient".

In the 1960s, with the frequent occurrence of global hijacking incidents, airport security checks emerged, initially relying solely on manual inspection of passengers and luggage, which was inefficient and had a high risk of missed detections. In the 1970s, the introduction of metal detectors marked the entry of security inspection products into the electronic era. Through the principle of electromagnetic induction, rapid screening of metal hazardous materials was achieved, becoming a standard equipment in the security inspection process at that time. In the 1980s, the popularity of X-ray machines brought revolutionary breakthroughs. Non invasive inspection methods allowed prohibited items inside luggage to be exposed. Combined with image analysis technology, it greatly improved the efficiency and accuracy of security checks. After the "9/11" incident in 2001, global awareness of air defense security was comprehensively enhanced, and security products experienced a leapfrog development. New technologies such as liquid detection and trace detection of explosives emerged one after another, forming a multi-level and all-round defense system.

Nowadays, the new generation of airport security products is moving towards intelligence, integration, and humanization. The dual energy X-ray security inspection equipment relies on high and low level X-ray scanning technology to accurately distinguish between organic and inorganic substances. Combined with AI intelligent image recognition algorithms, it can automatically mark suspicious items and minimize manual misjudgment rates. The millimeter wave human body security checkpoint uses non ionizing electromagnetic wave scanning technology to achieve non-contact and rapid detection of hidden objects on the body surface without infringing on passenger privacy. Its radiation dose is only one ten thousandth of that of mobile phone signals, which combines safety and efficiency. The trace explosive detector relies on nanogram level detection accuracy and quickly identifies explosive residues through ion mobility spectrometry technology, becoming one of the "ultimate defenses" against terrorist threats. The integration and application of these technologies not only enhances the safety margin of security checks, but also greatly improves the passenger's experience of passing through.

In the future, with the deep penetration of technologies such as artificial intelligence, the Internet of Things, and big data, airport security products will achieve deeper innovation. Perhaps in the near future, "seamless security checks" will become a reality - passengers can complete a comprehensive inspection of their entire body and luggage without stopping or opening boxes, truly achieving a perfect balance between "safety and efficiency" and building a more solid technological barrier for air transportation safety.