Security Technology: Intelligent Fiber Intrusion Alarm System [Full Text]
Littrow prisms feature 30°, 60°, and 90° angles .30° - 60° - 90° Littrow Dispersion Prisms can be used for a variety of applications. Uncoated littrow dipersion prisms are used to disperse light into its component spectrum. Coated littrow dipersion prisms are used to deviate the line of sight by 60°.
Dispersion Prisms (Uncoated)
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The products spawned under the new situation of counter-terrorism
History will not forget. On September 11, 2001, four civilian airliners flying over the United States were hijacked. When the Americans were just preparing to start their day's work, the skyscrapers of the Manhattan World Trade Center in New York crashed after being robbed by planes. Some parts of the structure of the Pentagon in Washington collapsed due to an airplane crash, resulting in thousands of casualties. And people's psychological trauma for several years.
Since the "September 11" incident, the threat of international terrorism has shown constant proliferation and continued to rise. The safety and security work has received unprecedented attention from governments of all countries. The application of high-tech in the modern fight against terrorism completely changed many concepts of traditional security and further led to major changes in the security system.
On May 17, 2009, the State Council and the Central Military Commission printed and issued the Opinions on Strengthening the Protection of Military Installations, requiring them to stand at the height of safeguarding national security interests, set obstacles, boundary lines, and warning signs in accordance with regulations, and install safety technology protection equipment. Comprehensively using traditional means and high-tech means to strengthen the protection of military facilities.
This paper document has opened the way for the eleven-housing technicians who have unique advantages in the field of sensory monitoring and control technology. According to Wu Jiufeng, deputy director of the measurement and control technology division of the hospital, the protection of military facilities is closely related to sensor monitoring and control technology, which is in line with the concept of popular Internet of Things.
The so-called Internet of Things is a kind of network concept that intelligently identifies, locates, tracks, monitors, and manages the information exchange and communication through information sensing equipment, and according to the agreed protocol, connecting any item with the Internet. In a sense, the Internet of Things is a sensor network whose core is the sensor.
Look at the National Medium and Long-Term Scientific and Technological Development Plan (2006-2020), which also clearly stated that it is necessary to focus on the development of new types of sensors and intelligent information processing technologies based on multiple sensing information to develop low-cost Sensor network.
On the one hand, the need for national security precautions, and on the other hand, the development trend of technology itself, how can the two be skillfully combined? Wu Jiufeng and others knew that history has pushed an important development opportunity before their eyes. It should be noted that the original technological achievements accumulated by the Eleventh Academy have not only been applied to major projects such as manned spaceflight, but also formed a certain market scale. If you want to further win the market
Recognized, it must quickly join the booming field of fiber optic sensors.
After careful demonstration, in July 2009, the 11th Institute and Aerospace Science and Technology Investment Holdings Co., Ltd. jointly invested 100 million yuan to set up aerospace Shenzhou Sensing Measurement and Control Technology Co., Ltd. to accelerate the industrialization, scale, and market of sensor technology products. Change.
Aerospace Sensing Technology Achieves Important Leap Forward
Sensor technology, together with computer technology and communication technology, is called the three pillars of information technology. If the computer is treated as a "brain" that processes and recognizes information, and a communication system as a "nervous system" that transmits information, the sensor is a "sensory organ." The metaphor of this image conveys the importance of sensory technology.
Eleventh House has traditional advantages in this area. The various sensing and control products of the Institute have been widely used for many years and have been highly recognized by customers. It has a high reputation in industrial control automation and other industries.
In recent years, optical fiber sensing technology has developed rapidly. Different from the traditional technology, it has the characteristics of anti-interference, corrosion resistance, high sensitivity, high reliability, small size, etc. It is especially suitable for large-scale long-distance distributed measurement. It is the trend of future industrialization.
Prior to the establishment of Aerospace Sensing Measurement & Control Technology Co., Ltd., the Eleventh Institute had already carried out relevant pre-research work on the aerospace optical fiber white light interferometry technology through cooperation with universities. According to the technical idea, it is necessary to have dynamic sensing for long-distance, large-scale dynamic sensing in harsh environments, and to achieve precise positioning and signal restoration.
In 2009, in order to closely integrate market demands and seize users, the hospital specifically gave technicians a dean's order – the end of the year must come up with technical solutions to meet the demand. This time, only two or three months from the end of the year.
Zhou Ying is a core technician who directly faces the challenge of converting technology into engineering products. According to their recollections, after the dean’s orders were issued, their team used a high pressure tank area as a test site. A nearby small house was used as a test platform. It was designed, sampled, tested and analyzed day and night to achieve scientific research. The best conversion of technology to practical products. During this period, some members did not even attend to their pregnant wife. Finally, the expected results were achieved before the arrival of the Spring Festival in 2010.
"We are naturally very excited, but the most thing we want to do is to sleep in the United States and the United States, because it is too tired." Think of that period of time, Zhou Ying is still very emotional, "after the Spring Festival, in order to improve the product's database information, We have to do a lot of experiments. The more severe the weather is, windy, snowy, etc., the more we need to test data on the spot and optimize the product so that users can use it better."
At present, the products developed by the Eleventh Institute based on fiber-optic sensing technology include smart fiber intrusion alarm systems, communication cable safety monitoring systems, oil and gas pipeline safety monitoring systems, and fiber-optic voice collection systems, etc., which are mainly used for security and petroleum in important locations. Security along the trunk line.
"After a series of data comparisons and user opinion collection, our products have achieved world-leading level and are listed as a key military-civilian dual-use technology of the Aerospace Science and Technology Group, which can be widely used in military, energy, communications, transportation, and environmental fields. " Wu Jiufeng believes that their products can be recognized by more and more organizations.
Collimated white light enters into the A-C surface of the prism, is reflected at the hypotenuse surface, and then dispersed into its component spectrum at the B-C surface. Although Littrow prisms produce narrower dispersion than equilateral prisms, Littrow prisms are typically less expensive.
Beam Deviation Prisms (Coated)
Incident light enters into the aluminum coated B-C surface of the prism at the nominal angle and returns back using the same path. In spectrum dispersion applications utilizing white light, the resolution performance of Littrow prisms is equal to equilateral prisms since the optical path length through the glass substrate is the same distance round-trip. Additionally, light entered into the A-C surface will reflect twice inside the glass substrate before being emitted through the hypotenuse surface at 60°.
