Now is the critical moment to fight the epidemic, and the application of various scientific and technological means has greatly improved the effect of scientific epidemic prevention. With the increase of the rate of returning to work, crowded places such as airports and subways have become the focus of monitoring, and contact and communication during the return journey has also become the most concerned topic. When it comes to the hidden dangers of intensive contact, security inspection is an unavoidable topic. On January 28th, a patient diagnosed in Hefei once wore a mask to take Line 2 on the afternoon of January 22nd, which directly led to six security personnel being arranged for medical observation at home.
In this regard, many places have offered an "artifact." On February 12th, an "artifact" named "All-process non-contact temperature measurement, security inspection and security integrated machine" was officially opened in Shanghai Metro. On February 17th, six identical "artifacts" appeared at three stations of Hefei Rail Transit Lines 1 and 2. This "artifact" only needs the inspected person to walk through the security inspection area normally, and can complete temperature measurement and security inspection at the same time without stopping, and there is no contact in the whole process.
01 "Non-contact" effectively cuts off the route of virus transmission. By 24: 00 on February 27th, 2020, the total number of confirmed cases in COVID-19 was 78,824. Behind the large number of confirmed cases, the disease was highly contagious.
Wang Guiqiang, director of the Department of Infectious Diseases of the First Hospital of Peking University and chairman of the Infectious Diseases Branch of the Chinese Medical Association, said in an interview that it is entirely possible for 15 seconds of contact to cause the spread of COVID-19. If there is no protection, the local virus is very high, and it may spread in 2 seconds.
The case of the cruise ship "Diamond Princess" docked outside Yokohama Port can better prove the strong infectivity of COVID-19. It is reported that as of February 23rd, 705 passengers and crew members on the Diamond Princess were diagnosed with COVID-19, including a quarantine officer in his fifties. He wore a mask and gloves when collecting passenger questionnaires and taking his temperature, but he didn’t use full-body protective clothing and goggles. A few days later, he had a fever and was diagnosed. According to the latest news from Japanese media, 45 people who disembarked from the "Diamond Princess" cruise ship had fever and other symptoms on the 26th.
▲ Quarantine personnel work on the Japanese cruise ship "Diamond Princess". Image source: Xinhua News Agency
At present, contact and droplets are the main transmission routes of COVID-19 virus, and temperature measurement is a routine means to identify suspected cases. Therefore, the staff responsible for security inspection in public transportation fields such as subway and high-speed rail should also complete temperature measurement and take into account the security inspection efficiency to avoid long-term crowded people.
As we all know, security inspection is generally divided into four forms. One is X-ray security inspection equipment, which is mainly used to check passengers’ luggage and articles; The second is to detect the inspection door, which is used for the physical examination of passengers; Third, magnetic detectors, also known as portable detectors, are mainly used for close inspection of passengers; The fourth is manual inspection, that is, passengers’ luggage is searched manually by security staff and searched by male and female inspectors respectively.
For a long time, security inspection can’t give consideration to both efficiency and safety. The above four security inspection modes have been criticized for their inefficiency and long queues. Among the three security inspections aimed at passengers’ bodies, two of them are contact, which also brings physical discomfort to many passengers and even causes disputes.
In addition, the current general temperature measurement method is also contact temperature measurement, and the distance between security personnel and passengers cannot exceed 1 meter. Under normal circumstances, a subway security checkpoint is a six-person mode, which can provide security inspection for 300 people per hour. In the case of fierce epidemic, security personnel frequently contact with different passengers, which increases the risk of cross-infection.
Traditional temperature measurement method
It is in order to reduce the risk of infection that the subways in Shanghai and Hefei have introduced an "artifact"-a terahertz non-contact temperature measurement, security inspection and security integrated machine. As long as the inspected person walks through this machine normally, he can complete the security check and temperature measurement of the human body at the same time without stopping, and the accuracy rate reaches 98%.
▲ Passengers pass the whole process of non-contact temperature measurement, security inspection and security integrated machine.
The non-contact security inspection mode in the whole process eliminates the risk of contact infection in hand inspection and close-range temperature measurement, and the temperature is one-to-one corresponding through face recognition and effectively stored locally for 90 days, which truly realizes pre-warning, post-traceability and information interconnection, which is tantamount to a "safety net".
The investment of this "artifact" has also reduced the number of security personnel. Take the subway as an example, the original entrance needs at least 6 people, which can be reduced to 3-4 people at most, and the passing efficiency has also increased from the original 300 people/hour to 1,500 people/hour, which has increased the efficiency by five times, alleviating the pressure of subway crowd gathering.
At present, the "THz whole process non-contact temperature measurement and security inspection integrated machine" has also settled in the First Affiliated Hospital of China University of Science and Technology in Hefei. As a third-class hospital, the hospital undertakes the triage of a large number of patients, and the main entrance of the outpatient area receives nearly 10 thousand people every day, which is of great responsibility for epidemic prevention and inspection. With the "THz whole process non-contact temperature measurement and security inspection integrated machine", patients can be quickly admitted to the hospital, and at the same time, people with abnormal temperature can be accurately screened for re-examination, which adds a guarantee for epidemic prevention work.
▲ The whole process of non-contact temperature measurement, security inspection and security integrated machine was put into use in the First Affiliated Hospital of Hefei China University of Science and Technology.
In addition to subway stations and hospitals, airports, railway stations, public security inspection systems, customs, museums, military institutions and other places with high traffic demand for terahertz security inspection, and the pace of launching will be further accelerated.
Behind the "artifact" of scientific and technological strength in the fight against the epidemic is a terahertz technology called "Top Ten Technologies to Change the Future World". What is terahertz?
Terahertz refers to the radiation with the frequency of 0.1-10THz and the wavelength range of 0.03-3 mm. From the perspective of spatial resolution, it is shorter than the traditional microwave and millimeter wave, so the spatial resolution is high. From the perspective of penetration ability, it is longer than the infrared and visible light, so the penetration ability is strong. Moreover, it releases very little energy and is basically harmless to the human body.
Based on these high-quality characteristics, terahertz technology is widely used in the field of public safety, specifically security inspection.
For the security inspection of human body, THz security inspection instrument can capture THz waves emitted by human body and image them. When the person being inspected passes through the THz security channel, different items carried with him will block the THz waves emitted by the human body to varying degrees, forming shadows, so that we can judge whether he carries suspicious objects and accurately locate the shape, size and position of the suspicious objects.
Terahertz technology has a unique "eye" for the security inspection of articles because of its strong penetration, which can detect non-metallic substances such as colloid, powder, ceramics, liquid, organic explosives and so on that can not be recognized by traditional metal security doors and hand-held metal detectors. This has greatly improved the ability to prevent various criminal acts of concealing dangerous goods, and provided a new weapon for public safety and anti-terrorism and stability.
When it comes to THz security inspection skills, we have to say that there are 38 Bowei THz companies in China Electric Power Branch. China Electronics Technology Corporation is the main force in China’s electronics and information industry, and also the top ten military enterprises in the world. Bowei Terahertz Information Technology Co., Ltd. is a high-tech enterprise controlled by China Electric Power Department and No.38 Research Institute. It was established in Hefei, Anhui Province in 2016. Relying on the military background of China Electric Branch, THz high-tech products made by "China Zhizao" play a vanguard role in China’s security inspection.
The whole process of non-contact temperature measurement, security inspection and security all-in-one machine put into use in various places this time is designed and manufactured by Bowei Terahertz, with the etherhertz human body security instrument as the core, creatively combined with infrared temperature measurement equipment, which can not only complete the security inspection of personnel without contact, but also measure the body temperature, serving the epidemic safety in a special period.
In fact, Bowei terahertz security products have provided services for many national-level events in China. For China International Import Expo(CIIE), Zhuhai Air Show, Boao Forum and other major events, Bowei Terahertz has provided security for two consecutive years.
▲ world internet conference’s Bowei terahertz security products to ensure safety.
▲ Bowei terahertz security inspection products at China Air Show can complete human security inspection in one second.
At present, the domestic security inspection market has a large scale, and will continue to rise in the future.
At the national emergency meeting of public security organs held in 2019, the Ministry of Public Security requested that new security technologies and products should be promoted and installed on every subway train and every bus, and basic skills such as identifying prohibited items should be improved, and measures for checking and controlling prohibited items should be strengthened.
With the further promotion of terahertz security inspection equipment and the further reduction of equipment cost, the safety and economic benefits brought by terahertz security inspection replacing traditional security inspection will become more and more prominent, and the terahertz security inspection market with technology changing the world has been opened.