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Application of RF and Microwave Technology in Security Field
Source:Original | Author:C&T RF Antennas Inc | Publish time: 2018-11-13 | 2159 Views | Share:

 

2.1. Entrance and Exit Human Security

It is of great significance to carry out human safety inspections on important places and key units (such as airports, train stations, and entrances and exits of large conferences) to carry out human safety inspections for people who may carry hazardous products. The existing imaging-based security inspection technologies mainly include X-ray backscatter imaging, infrared imaging, and millimeter wave imaging. X-ray backscatter technology has clear images and high resolution, but it has potential radiation damage to the human body and is suitable for fine inspection of carry-on baggage. Infrared imaging technology uses target temperature difference to form two-dimensional images, but cannot penetrate clothes. Suitable for long-term monitoring and identification in specific areas; while millimeter-wave can penetrate human body clothing to detect various metal hazardous items concealed under human clothes, as well as non-metallic hazardous items such as ceramic pistols and liquid explosives. Solve the first two kinds of undetectable hidden detections of carry-on items.

 

According to the imaging system, millimeter-wave human body security inspection technologies are mainly divided into active and passive imaging technologies. The active millimeter wave generally uses a millimeter wave source for illumination, and the image signal to noise ratio and contrast ratio are relatively high, and the image resolution can reach millimeters. However, due to the existence of the transceiving process, the imaging time is long, and the person to be inspected cooperates to raise hands. , Turning and other movements, slowing the passage of personnel, is suitable for occasions that require detailed inspections and relatively small personnel movements, including airports. Some airports in the United States and other countries have adopted a cooperative millimeter-wave human body security inspection system to conduct detailed inspections of passengers in the security inspection area. For people-intensive and fluid places, such as subways and railway stations, this type of security inspection will inevitably affect the public order. Therefore, we need to introduce more rapid and efficient human security inspection equipment, namely passive millimeter wave imaging technology. This technology determines the presence or absence of contraband by measuring the millimeter wave of radiation emitted by the human body and the objects it carries. The biggest advantage is that the imaging speed is fast, and the video speed can theoretically be achieved without affecting the normal behavior of the person being examined, but due to radiation signals. Generally weaker, corresponding radiometer temperature sensitivity is not high, the image signal to noise ratio is not high, the resolution is low.