A "snapshot" to get human security

At the just-concluded 2015 Hannover Consumer Electronics, Information and Communication Expo (CeBIT2015), a non-contact human security screening system solution has attracted media attention.

"This is the world's first integrated security system-level application solution based on passive terahertz technology. It can combine the terahertz human security tester with other existing mature security inspection methods according to the needs of different industries. Produce a security inspection system that adapts to different environments and create a new personalized security environment that meets customer needs.”

Dr. Zhao Zhenli of China Electronics Technology Group Corporation, which is in charge of project research and development, told the reporter of Science and Technology Daily that this security system named Terasnap is different from the traditional method of “sweeping and touching” and that a “snapshot” can be used to secure human security.

Never heard of terahertz, then you OUT

At the heart of the Terasnap security system is the terahertz technology, which is known as one of the "Top Ten Technologies for Changing the Future World." "Tera is the meaning of terahertz." Zhao Zhenli said that "terahertz" was originally a frequency unit (THz) and 1THz equals 10 of 12th power Hz.

Electromagnetic waves with a frequency of 0.1 THz to 10 THz are called "terahertz waves." In the electromagnetic wave family, the position of the terahertz wave is very special. It is higher in frequency than microwave and lower than infrared. It is in the transition from macroscopic classical theory to microscopic quantum theory, electronics to photonics, and wave-like to particle. Therefore, the terahertz wave is not entirely suitable for processing with optical theory, nor is it entirely suitable for studying with microwave theory, and is the only band in the electromagnetic spectrum that has not been fully studied. As a result, this area was once "forgotten" by people and formed a "terahertz gap." It was formally named "terahtz" in the mid to late 1980s.

Since the 1990s, researchers have begun to develop terahertz sources and detectors , making terahertz technology a global technological frontier. In 2004, the Massachusetts Institute of Technology named THz Technology as one of the “Top Ten Technologies for Changing the World in the Future”. The U.S. Department of Defense Advanced Research Projects Agency, NASA, and other agencies have invested heavily in terahertz waves for military and space exploration projects. The Japanese government listed it as "the top ten key strategic objectives of the country's pillar technology." It declared that it will achieve terahertz high-speed communications at the 2020 Tokyo Olympics at a speed of 100 gigabits per second, 1,000 times that of current LTE networks.

Terahertz human body security, no contact

Since the wavelength of the terahertz wave is between the infrared ray and the microwave, it has strong penetrability and can be generated by the human body and radiate outwards. "The Terahertz Human Security Monitor can passively receive terahertz waves from the human body and develop two-dimensional 'snapshots' of the human body through processing." Zhao Zhenli explained that when objects are hidden in clothes worn by the human body, the area radiates out. The terahertz wave is blocked and produces shadows that are inconsistent with other parts of the body in the “snapshot” to detect the location, shape and size of the hidden objects. "This is the basic principle of the Terahertz Human Security Device, and it is also the core of the Terasnap Security System."

Most people have the experience of going through the security inspection at the airport. When passing the security gate, if the alarm sounds, you will be taken to the side and the security inspector holds the detector to further carefully detect the location where the dangerous goods may be hidden. Necessary security personnel will also directly touch the ankle and other locations to ensure that there is no omission.

Dr. Zhao Zhenli said in an interview with Science and Technology Daily that security inspections and personal privacy protections seem to be an irreconcilable contradiction. Human body security has also been in an embarrassing situation, and poor handling can easily lead to resentment and even intensification of those who are being screened. conflict. He believes that "the non-contact passive safety check of the THz has subtly reconciled the contradictions, turning the originally boring and devious contact security into a face-saving and efficient technology experience."

Fast and accurate, security inspection efficiency increased by 10 times

As mentioned earlier, Tera means terahertz, and snap means snap. "Terasnap security system is as convenient as scanning a human body when scanning a human body." Zhao Zhenli said, "Safe, reliable and efficient is the system's Salient features."

According to reports, unlike traditional security devices that actively emit detection echoes, the terahertz security instrument adopts the principle of passive acceptance, and the device does not have any ionization or electromagnetic radiation, so it is absolutely safe for the personnel to be inspected. And not only can detect metal substances, but also can detect non-metallic hazardous substances such as ceramic knives, drug powders, liquid explosives, colloid bombs. In addition, the device can detect 1,000 people per hour, which is 10 times the speed of traditional manual security detection.

After the "September 11 Incident," several European and American developed countries first invested in research and development of terahertz technology, and they are already in a monopoly on the market. In order to break the monopoly of technology, China Electronics Technology Corporation launched the development of the THz imaging security inspection system in November 2010. It lasted four years to develop and complete the BoTek human security inspection instrument, which was held in May last year. The 9th China International This device was first released at the Defense Electronics Show.

Dr. Zhao Zhenli said that the THz Human Security Tester is safer, more secure, more lightweight, and smarter. Compared with other similar products abroad, it is free from any radiation and is more suitable for strict EU standards. It does not require on-site infrastructure construction and is easy to deploy. It can be intelligently judged by unattended personnel, reducing the workload of staff and reducing the accumulation of personnel. The characteristics of domestic passenger flow; and Terasnap system can be more adapted to the needs of different scenarios at home and abroad, according to the different needs of the airport, railway station, subway station, public security system for the environment, personalized customization.

- Extended reading

Terahertz supports post-Moore era information technology development

Terahertz waves can be applied in many important fields such as life sciences, materials science, astronomy, atmospheric and environmental monitoring, communications, anti-terrorism, and national security. Industry sources pointed out that terahertz is the last virgin land of the electromagnetic spectrum. It has unique advantages and extremely important applications. It is the science and technology foundation of a new generation of industries. Terahertz Science combines the characteristics of electronics and photonics. It is a typical cross-cutting frontier science field. It contains significant original mechanisms and methods and urgently requires breakthrough. It is of great scientific significance.

Terahertz wireless communication can carry a larger amount of information, and solve the problem that the current information transmission is subject to the bandwidth. It is the only communication method known to meet the communication requirements of the wireless data transmission rate of big data. The International Telecommunications Union has designated the next-generation terrestrial wireless communications band at 0.12 THz. Terahertz technology will become the basis for 6G or 7G communications, and humans will fully enter the era of terahertz communications. Terahertz science and technology will also be an important support for the development of information technology in the post-Moore era.

Terahertz also has great scientific value and broad application prospects in molecular fingerprint detection, diagnostic imaging, security anti-terrorism, and astronomical research. As laser technology enters the terahertz band, it brings the most competitive light source for terahertz development and opens up new horizons for terahertz research.

At present, general research on terahertz technology focuses on the development of three major components, terahertz source generation, terahertz detection, and applied research. At present, the biggest difficulty is that there are no high-power portable and continuously adjustable, lower-cost terahertz emission sources and filters that meet the actual requirements.

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