Since the birth of the world’s first ruby ​​laser in the 1960s, thousands of new types of lasers have been developed. Their application technologies have produced fruitful results in various fields such as industry, agriculture, medical care, defense, and science and technology. There are more and more attractive prospects. In recent years, the rapidly developing security technology prevention industry has been looking forward to joining the new army of lasers. After nearly five years of efforts, Shandong Tengzhou Feitian Laser Technology Co., Ltd. has successfully developed a laser intrusion detector that uses a semiconductor laser as a probe source and makes all related technologies practical. By combining it with optical and electronic components and matching it with the corresponding alarm control host, it can form a new powerful and unique laser intrusion alarm system .
First, the basic principles and characteristics of laser
The laser emitter consists of a working substance, an optical resonator, and an excitation source. The working substance is the core part of the laser, which contains a large number of atoms, molecules or ions that can emit laser light. Various types of lasers can therefore generate laser light of different wavelengths, mainly because the energy levels of the internal structures of these activated particles are different. The excitation (pumping) source is the source of energy for generating the laser. Different laser working substances use different incentive methods and excitation sources.
The optical resonator is a device that realizes back-and-forth oscillation of stimulated radiation and selects and limits the direction and wavelength of the output beam.
Using an optical or electrical excitation source, the energy level of the laser working substance is reversed, and the stimulated radiation photon flow is continuously amplified along the axial direction of the optical cavity, and a very strong laser beam can be emitted at one end thereof. Its brightness is extremely high, its directionality is the best, its frequency is single, and its phase is the same. These are all unmatched by any other light source, resulting in epoch-making new developments in the application of optoelectronic technology in various fields.
Second, the basic composition and working methods of laser intrusion detectors
Laser intrusion detectors are active intrusion detectors. It consists of a laser transmitter and a laser receiver. The laser transmitter consists of a laser transmitter, a modulated excitation power supply, and a corresponding direction adjustment mechanism. The laser receiver consists of a laser receiver, an optoelectronic signal processor, and a corresponding support mechanism.
The system is to set up a laser transmitter at the beginning of the protection area, and direct the strong laser beam emitted from it to the target directly (or through an optical reflector or through a laser repeater). The receiver at the target converts the received optical signal into a characteristic signal through an optoelectronic device and is processed by a discriminator. When the confirmation signal is normal, the green light is displayed and the monitoring state is maintained; when the light beam is interrupted, the signal is abnormal, a red light is displayed, and an alarm signal is output at the same time, so as to realize a full frame or turn path formed by the laser beam. Monitoring. The audible and visual alarms and control actions are issued by the alarm control panel and notified to the relevant departments through wired or wireless methods. The laser intruder detector power supply is 12VDC (11V~16V) or 220VAC AC. The alarm signal output terminal is a potential-free relay contact (normally open or normally closed optional), which can be used in conjunction with general purpose various types of alarm control consoles and auxiliary equipment.
Third, the advantages of laser intrusion detectors and alarm systems
a) Suitable for long-distance work. The directivity of the laser beam is excellent, so the light energy is concentrated and the transmission efficiency is very high. With the same emission power, the laser power density at 100 m or 200 m is several hundred times that of the infrared radiation detector. Therefore, the transmission distance is farther, and the ability to penetrate rain, fog, and snow is stronger. This can ensure long-distance normal work and reduce the false alarm rate in bad weather.
b) Closed-circuit transmission without mutual interference. The laser beam is a closed-circuit transmission, so there is no problem that the infrared radiation detectors are continuously arranged on a straight line or the adjacent systems interfere with each other, and can be arranged continuously in a straight line or at a close distance. There is also no problem with infrared light leakage that interferes with other sensitive infrared devices around.
c) Strong resistance to external stray light and electromagnetic interference. Reasonable optical receivers and high power density transmitters make this system highly resistant to interference. Utilizing the superior monochromaticity of the laser beam and the advantages of controllable spot size, the system can work normally in severely disturbed environments.
d) Comprehensive deployment, with a wide range of adaptation. Compared with a single infrared detector, this product can be called a laser integrated spatial deployment system. The emitted light beam can be reflected, reflected, received in the original place, turned back and returned; it can also form a plane, three-dimensional layout. The defense can be fixed very securely. It can also be a temporary flow defense or a dynamic fortification.
e) On-site commissioning is quick and easy to overhaul. The system is provided with a dedicated laser locator, which can easily detect the location of the light spot at any time. In the process of propagation, obstacles such as branches and leaves can be blocked, and the direction and distance between the deviation of the light spot at the receiving point and the distance from the center can be judged directly, and thus the adjustment work can be guided accurately and promptly.
f) The total cost of the project is good, the system has a long service life and low maintenance costs. Careful design of the configuration scheme can make full use of the characteristics of the laser system, significantly reduce the cost of purchasing equipment, reduce the amount of construction, and reduce the impact on the environment. System maintenance, laser tube replacement is very convenient. It will not happen that some imported products cannot be overhauled, and partial damages will cause the entire system to be scrapped.
Fourth, laser intrusion detectors and systems are maturing to a better future
Since the laser intrusion detector was put into trial operation in 1999, it has been improved and improved, and it has been mass-produced in 2002. It has gradually realized the serialization of line, plane and three-dimensional products. At home and abroad for the first time introduced two-tier, four-tier outdoor perimeter system new products. In Beijing, Liaoning, Jiangsu and other provinces and cities, the outdoor perimeter, indoor laser doors and other systems have experienced several tests in spring, summer, autumn and winter, high and low temperature environment, earthquake resistance, overall stability and reliability. The system is operating normally and received satisfaction. The effect has been well received by domestic and foreign counterparts. We have every reason to believe that the Chinese people’s own high-tech flowers will certainly be more open and colorful in the field of security technology prevention and related fields.
First, the basic principles and characteristics of laser
The laser emitter consists of a working substance, an optical resonator, and an excitation source. The working substance is the core part of the laser, which contains a large number of atoms, molecules or ions that can emit laser light. Various types of lasers can therefore generate laser light of different wavelengths, mainly because the energy levels of the internal structures of these activated particles are different. The excitation (pumping) source is the source of energy for generating the laser. Different laser working substances use different incentive methods and excitation sources.
The optical resonator is a device that realizes back-and-forth oscillation of stimulated radiation and selects and limits the direction and wavelength of the output beam.
Using an optical or electrical excitation source, the energy level of the laser working substance is reversed, and the stimulated radiation photon flow is continuously amplified along the axial direction of the optical cavity, and a very strong laser beam can be emitted at one end thereof. Its brightness is extremely high, its directionality is the best, its frequency is single, and its phase is the same. These are all unmatched by any other light source, resulting in epoch-making new developments in the application of optoelectronic technology in various fields.
Second, the basic composition and working methods of laser intrusion detectors
Laser intrusion detectors are active intrusion detectors. It consists of a laser transmitter and a laser receiver. The laser transmitter consists of a laser transmitter, a modulated excitation power supply, and a corresponding direction adjustment mechanism. The laser receiver consists of a laser receiver, an optoelectronic signal processor, and a corresponding support mechanism.
The system is to set up a laser transmitter at the beginning of the protection area, and direct the strong laser beam emitted from it to the target directly (or through an optical reflector or through a laser repeater). The receiver at the target converts the received optical signal into a characteristic signal through an optoelectronic device and is processed by a discriminator. When the confirmation signal is normal, the green light is displayed and the monitoring state is maintained; when the light beam is interrupted, the signal is abnormal, a red light is displayed, and an alarm signal is output at the same time, so as to realize a full frame or turn path formed by the laser beam. Monitoring. The audible and visual alarms and control actions are issued by the alarm control panel and notified to the relevant departments through wired or wireless methods. The laser intruder detector power supply is 12VDC (11V~16V) or 220VAC AC. The alarm signal output terminal is a potential-free relay contact (normally open or normally closed optional), which can be used in conjunction with general purpose various types of alarm control consoles and auxiliary equipment.
Third, the advantages of laser intrusion detectors and alarm systems
a) Suitable for long-distance work. The directivity of the laser beam is excellent, so the light energy is concentrated and the transmission efficiency is very high. With the same emission power, the laser power density at 100 m or 200 m is several hundred times that of the infrared radiation detector. Therefore, the transmission distance is farther, and the ability to penetrate rain, fog, and snow is stronger. This can ensure long-distance normal work and reduce the false alarm rate in bad weather.
b) Closed-circuit transmission without mutual interference. The laser beam is a closed-circuit transmission, so there is no problem that the infrared radiation detectors are continuously arranged on a straight line or the adjacent systems interfere with each other, and can be arranged continuously in a straight line or at a close distance. There is also no problem with infrared light leakage that interferes with other sensitive infrared devices around.
c) Strong resistance to external stray light and electromagnetic interference. Reasonable optical receivers and high power density transmitters make this system highly resistant to interference. Utilizing the superior monochromaticity of the laser beam and the advantages of controllable spot size, the system can work normally in severely disturbed environments.
d) Comprehensive deployment, with a wide range of adaptation. Compared with a single infrared detector, this product can be called a laser integrated spatial deployment system. The emitted light beam can be reflected, reflected, received in the original place, turned back and returned; it can also form a plane, three-dimensional layout. The defense can be fixed very securely. It can also be a temporary flow defense or a dynamic fortification.
e) On-site commissioning is quick and easy to overhaul. The system is provided with a dedicated laser locator, which can easily detect the location of the light spot at any time. In the process of propagation, obstacles such as branches and leaves can be blocked, and the direction and distance between the deviation of the light spot at the receiving point and the distance from the center can be judged directly, and thus the adjustment work can be guided accurately and promptly.
f) The total cost of the project is good, the system has a long service life and low maintenance costs. Careful design of the configuration scheme can make full use of the characteristics of the laser system, significantly reduce the cost of purchasing equipment, reduce the amount of construction, and reduce the impact on the environment. System maintenance, laser tube replacement is very convenient. It will not happen that some imported products cannot be overhauled, and partial damages will cause the entire system to be scrapped.
Fourth, laser intrusion detectors and systems are maturing to a better future
Since the laser intrusion detector was put into trial operation in 1999, it has been improved and improved, and it has been mass-produced in 2002. It has gradually realized the serialization of line, plane and three-dimensional products. At home and abroad for the first time introduced two-tier, four-tier outdoor perimeter system new products. In Beijing, Liaoning, Jiangsu and other provinces and cities, the outdoor perimeter, indoor laser doors and other systems have experienced several tests in spring, summer, autumn and winter, high and low temperature environment, earthquake resistance, overall stability and reliability. The system is operating normally and received satisfaction. The effect has been well received by domestic and foreign counterparts. We have every reason to believe that the Chinese people’s own high-tech flowers will certainly be more open and colorful in the field of security technology prevention and related fields.
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