1. Scalability. It is advisable to adopt a distributed system and a modular structure design to meet the needs of system scale expansion, function expansion, and supporting software upgrades. The user can expand or tailor the system as needed to demonstrate sufficient flexibility.
2. Convenience of system upgrade and maintenance. Due to the large scale of the system, the system software and core equipment should have automatic upgrade and maintenance functions. In addition, the urban monitoring and alarm networking system is composed of multiple complex systems, including network, storage, operating system, platform software, various front-end equipment, etc. Therefore, each subsystem is required to have a work log record, including the system modules and core settings.
3. The management function and easy operation of the system. Considering the scale and complexity of the networked system, the management software platform should have a better system architecture, and the system core management and business management must be clearly separated to ensure that different application requirements are met. Due to the large number of various management servers, storage and forwarding servers in the system, the network management function of the system must be strong. Otherwise, routine maintenance cannot be performed. The management and user interface provided by the system should be clear, concise and friendly, and the control should be simple. Flexible, easy to learn and use, easy to manage and maintain.
4. Reliability and stability. The system should use mature technology and reliable equipment, and have backup or redundancy measures for key equipment. The system software has maintenance support capability and strong fault tolerance and system recovery capability to ensure that the system runs stably for as long as possible, and can be repaired or restored as soon as the system fails.
5. Compatibility and standardization. Compatibility is the key to interconnecting devices from many different vendors and different protocols. The system should be able to communicate and share data efficiently, as much as possible to achieve compatibility and interoperability between devices or systems. The higher the degree of standardization of the system and the better the openness, the longer the life cycle of the system. Control protocols, transmission protocols, interface protocols, video and audio codecs, video and audio file formats, etc. shall comply with the corresponding national standards or industry standards.
6, the degree of security of the system. System security includes many aspects, mainly to prevent illegal users and devices from accessing. Therefore, in addition to different degrees of authentication for different users (including administrators and users), it is also necessary to ensure that illegal devices cannot be accessed. Go to the system. Networked monitoring systems are the most vulnerable to hackers, and effective security measures should be taken to prevent unauthorized access, illegal attacks, and virus infections. In addition, it is necessary to prevent unsafe factors such as lightning strikes, overload, power failure, electromagnetic interference and human damage to provide comprehensive and effective security measures.
7. The system supports the ability of secondary development. The number of cameras in a city's surveillance and alarm networking system is at least a few hundred, and many can reach tens of thousands. Therefore, the sustainable development of the platform must be considered. To achieve the goal of "video creation value", the system is required to have the conditions for secondary development, and only in this way can the platform video resources be fully utilized.
8, advanced and inherited. The construction of the urban video surveillance alarm networking system is unlikely to abandon the original analog-based system. It is appropriate to include the original simulation system as much as possible under the premise of planning a fully digital system. The most ideal system is to make a seamless connection between the two to form a complete urban video image network monitoring.
9, practicality. The system should take into account local environmental conditions, monitoring objects, monitoring methods, maintenance and investment scale, etc., to meet the needs of the urban video surveillance alarm networking system for normal operation and social public safety management.
10, performance and price ratio. Designers should reasonably set system functions, properly perform system configuration and equipment selection. Under the premise of excellent key equipment grades, the overall price of the system is guaranteed to be low, which makes the system cost-effective. The camera selection at the front end of the system and the level of the back-end software should be the focus of attention. If the number of lines of the front-end camera is lower than 460 lines, the subsequent system is no good, and it is impossible to ensure that the system has clear image effects. Advanced features such as wide dynamic range are also required in some applications.
Dome lenses are hemispheres. The two optical surfaces are an equal thickness apart, creating a naturally strong shape that gets tougher under pressure. This makes dome windows ideal for underwater environments and in applications such as camera dome ports and submersible windows.
BK7 or K9L domes are used primarily in meteorology applications. BK7 offers excellent transmission from 300nm up to 2µm. BK7 is a relatively hard material, with excellent chemical durability.
UV fused silica domes ( JGS1 ): For applications operating in the deeper UV range, we offers a range of UV fused silica domes. Fused silica domes are commonly used in underwater applications at extremely high pressures.
Sapphire domes: For infrared applications we can provide sapphire domes. Sapphire is an extremely hard material with transmission of over 80% in the 2-5µm wavelength range. As with fused silica, sapphire is able to withstand extreme pressures, making it the perfect material for underwater camera and missile fairing applications.
Specifiation of our dome lens as follow:
Material:Optical glass N-BK7 , H-K9L, UV Fused Silica, Sapphire, and infrared crystal materials.
Diameter:20-350mm
Diameter Tolerance:+/-0.1mm
Thickness:>2mm
Thickness Tolerance±0.2~0.1mm
Center Deviation:3-5'
Surface quality:80/50 60/40
Coating: Antireflection Coating inside or both sides
Chamfers:0.2 x 45° typical
Hk9 Glass Dome Lens,Hk9 Hemisphere Domes Lens,Hemispheric Glass Dome Lens,Optical K9 Glass Dome Lens
China Star Optics Technology Co.,Ltd. , https://www.opticsrealpoo.com