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Mobile container inspection system related technology

at the 2003 National Science and technology award conference held on February 20, 2004, the project "development and industrialization of accelerator radiation source mobile container inspection system series" completed by Kang Kejun, Gao Wenhuan and others won the first prize of national science and technology progress award. Tsinghua University and tongfangwei realized the speed control of the moving beam of the experimental machine. In only four years, they successfully completed the development and industrialization of the accelerator radiation source mobile container inspection system series. After the successful research and development of the fixed large container inspection system, they developed the world's first vehicle mounted mobile container inspection system using accelerators in only ten months according to the needs of the country, which was launched two years earlier than similar systems in Germany. At the same time, innovation has been made in the miniaturization of accelerators, and a movable combined mobile container inspection system has been developed. The comprehensive performance index reaches or exceeds that of similar foreign systems. Large container inspection system is a high-tech equipment specially used to inspect the goods in containers. It can quickly realize the non unpacking inspection of containers and is an important weapon against container smuggling. At present, the system has become the most effective container cargo in the world. Do you know? If you want to know more about the details of the experimental machine, one of the means of physical inspection has been widely used by the Chinese customs and recognized by the international market, which has led to the progress of the whole technology in this field in the world

this project is China's "Eighth Five Year Plan" for tackling key scientific and technological problems, and Tsinghua University has undertaken this task. After several years of efforts, we have successively overcome the key technologies involving accelerators, nuclear detectors, nuclear electronics, computer networks, software, control, radiation protection, machinery and other fields. At the end of 1995, we built a 1:1 large-scale experimental device, and later won the "Eighth Five Year Plan" major scientific and technological achievement award in early 1996. In 1998, the state began to crack down on smuggling on a large scale, and the customs began to equip the fixed container inspection system produced by the company in batches, and gradually realized some difficulties in the deployment of this system. It is in this demand that Chinese scientists developed two new container inspection systems, vehicle mounted and combined, within one year. After the "9.11" incident, the focus of cargo inspection has gradually shifted to explosive detection and industrial nondestructive testing, and the application fields have also expanded to aviation, railway, aerospace, weapons, etc

relevant technologies of China's mobile container inspection system

the main working principle of China's mobile container inspection system is to use high-energy X-rays to pass through the inspected container and receive the transmitted X-rays on the other side. If the goods in the box are different, the attenuation degree of the transmitted X-rays is different. The X-rays of different energy levels are recorded through a highly sensitive detector and converted into electrical signals, and then converted into digital signals by an a/d converter. With the help of a computer imaging system, these numbers are formed into images and displayed on the computer screen. The trained customs guards will easily identify suspicious objects through these images. Like a "mirror", smuggled goods, whether electrical appliances, cars, weapons, drugs, although hidden behind the thick container iron, will also reveal their true colors

the development of this system is very difficult. In order to penetrate the thick iron sheet, high-energy X-rays must be used, and in order to produce high-energy X-rays, high-power electrons must be used With regard to the load and deformation channel, the active marking line accelerator can be ended, resulting in problems such as personal safety and residual radiation of goods in use. Especially in the mobile mode, the technical difficulty is greater. It requires that many large-scale equipment such as accelerator, detector, imaging equipment, generator and so on be integrated together, which should not only ensure the penetration of rays, but also effectively shield radiation; It is necessary to prevent vehicle body shaking and strong electromagnetic interference between equipment; At the same time, high-sensitivity detectors (pen ionization chamber array) and high-speed imaging systems are extremely difficult, with the maximum penetration thickness of 200 mm steel plate and the resolution of 6 mm (take the iron wire behind 100 mm steel plate as an example). In terms of safety, the radiation safety and cargo dose indicators are far lower than the standards set by the World Health Organization (who) and the International Atomic Energy Commission (IAEA), laying the foundation for the commercialization of this scientific research project

the technology is characterized by a collection of disciplines, involving accelerators, detectors, nuclear electronics, radiation information processing, radiation protection and other disciplines. Its application must be combined with mathematics, physics, biology, medicine, electronics, electricity, machinery, control, computer, network, software, data processing and other disciplines and technologies

as of December 28, 2000, 10 inspection systems of different types of "tongfangweishi" have been installed in Beijing, Shanghai, Tianjin, Dalian, Qingdao, Shenzhen, Xiamen, Shantou, Guangzhou and other places, which marks the implementation of the guiding spirit of Zhu Rongji, the then Premier of the country in 1998, "we should enrich and strengthen the anti smuggling armed forces, and we are determined to equip all ports with container perspective inspection systems... Improve the combat effectiveness of anti smuggling", With regard to the "h986" project formulated in July 1998, that is, the phased results achieved by ordering 10 sets of large container inspection systems from Tsinghua Tongfang Co., Ltd. from 1998 to 2000. Up to now, the General Administration of Customs of China has signed a framework agreement with Tsinghua Tongfang to order a total of 40 sets of large container inspection systems in three types, including fixed, combined and vehicle mounted. It plans to equip them all to the 20 customs with the largest import and export volume of container freight in China in two years

in October, 2001, the technological progressiveness of the project was verified in the international market competition. Dubai customs of the United Arab Emirates invited Tongfang NUCTECH, Germany and the United States to provide a set of products to participate in the trial. In the end, "Tongfang Weishi" defeated its rivals with its excellent performance in image quality, high reliability and the detection of many cases, and obtained orders, which enabled China to achieve leapfrog development in this field and was ahead of Germany and the United States for the first time. At present, the total number of contracts for these two systems has been close to 100, accounting for more than 50% of the world's similar market. Australia, Norway, Iran, Belgium, South Korea, Hong Kong and other 12 countries and regions have purchased 51 systems

from the equipment that has been put into operation, its safety and inspection effect are good. Taking Tianjin Donggang fixed system as an example, in the first 10 months of operation, a total of 8189 container trucks, or 14505 standard containers, were inspected, and 548 illegal containers were seized, with a case value of more than 20million yuan, of which the cases of smuggling high-value goods in the name of imported waste and used goods were the majority. Overall, the normal operation rate of all operating systems has exceeded 99%. China's customs ports such as Qingdao, Xiamen and Shanghai, as well as the systems operated by the customs equipment of the United Arab Emirates and Australia, have seized dozens of important cases, including drug smuggling, human trafficking, African ivory, luxury cars, etc., which have effectively cracked down on the criminal activities of container freight smuggling, improved the supervision of Customs on import and export goods, and provided a new inspection means for international counter-terrorism

Ningbo Beilun port reported that in the past, it took an average of about 5 hours to manually inspect a container from moving to feedback closure, but now it takes an average of about 10 minutes from the test results of container scanning that will affect the verification work to the conclusion of inspection and release. Under normal conditions, the goods can be transported as they arrive, which greatly speeds up the customs clearance time, reduces the customs clearance cost, enriches the inspection means, and enhances the accuracy of detection. He said that in the past, the owner of the goods had to pay a total of about 1500 yuan for container removal, unpacking and reshipment. Now, if the goods are OK, the above fees can be exempted. Because the system has a special perspective function, it can find smuggled illegal goods hidden in corners and messy packaging, so it has an irreplaceable role in manual inspection. Using this system, Ningbo Beilun customs has seized 6 cases of violations. This system has become a powerful weapon against smuggling activities and has made contributions to ensuring national tax revenue

The successful development and industrialization of the mobile container inspection system series of accelerator radiation source is a model for the transformation of major scientific and technological achievements in China, and also a new breakthrough in the field of Applied Science of this technology

Author: quweiping article source: Logistics

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