As we all know, with the development of optoelectronic information, microelectronics, network communication, digital video, multimedia technology and sensing technology, security monitoring technology is also moving from traditional analog to highly integrated digital, intelligent, and networked. With the increase in market demand, modern high-tech has almost been applied or will be applied in security monitoring systems, among which low-light technology and infrared thermal imaging technology have also been applied in security systems.

Thermal imaging technology is a passive infrared night vision technology, ordinary infrared monitoring technology is active infrared night vision technology, thermal imaging technology uses the difference in infrared heat radiation intensity of different parts of natural objects to form an image, which is based on the target and background or The temperature difference or thermal radiation difference between the parts of the target is used to find the target. Because the technology does not change with the surrounding lighting conditions, it can provide video images in harsh environments such as day and night, even heavy fog, and rain. However, it cannot realize long-distance monitoring, and the monitoring screen can only judge whether suspicious persons enter, and cannot see the face and appearance characteristics clearly.

Ordinary infrared camera is an active infrared technology. It is a night vision technology that realizes camera surveillance by actively emitting infrared light and using the target to reflect infrared light. With the application of the third-generation infrared array technology, the effect of active infrared monitoring has been It has been well promoted, the product quality and life are better, and the manufacturing process requirements are not high, the cost is low, and it has a broader application prospect.

At present, infrared thermal imaging technology is more widely used in security than low-light-level imaging technology. Xue Shengyue, marketing manager of Largan, analyzed the specific applications of infrared thermal imaging and briefly summarized the following points.

1. Target monitoring at night and under severe weather conditions
At night when you can’t see your fingers, the monitoring equipment based on visible light can no longer work properly. If artificial lighting is used, it is easy to expose the target. If low-light night vision equipment is used, it also works in the visible light band, and still needs weak light from the outside. The infrared thermal imager passively accepts the infrared heat radiation of the target itself, and can work normally during the day and night, and will not expose itself. Even under severe weather conditions such as rain and fog, because the visible light has a short wavelength and poor ability to overcome obstacles, the observation effect is poor, but infrared has a long wavelength, especially for thermal imaging cameras that work at 8 to 14um. The rain and fog have high ability, so the target can still be observed normally. Therefore, at night, especially in harsh weather conditions, infrared thermal imaging monitoring equipment can be used to monitor various targets, such as people and vehicles.

2, fire protection monitoring
Because the infrared thermal imager is a device that reflects the surface temperature of an object, it can be used as an effective fire detection device in addition to being used for on-site monitoring at night. The application of infrared thermal imaging camera can quickly and effectively find these hidden fires, and can accurately determine the location and scope of the fire, and find the fire point through the smoke, so as to know and prevent and extinguish early.

3. Recognition of hidden targets
Ordinary is mainly to prevent visible light observation. The crimes committed by criminals are usually hidden in the grass and woods. Due to the harsh outdoor environment and human visual illusions, they are prone to misjudgment. The infrared thermal imaging device passively receives the thermal radiation of the target itself. The temperature and infrared radiation of the human body and the vehicle are generally much greater than the temperature and infrared radiation of the vegetation, so the target is not easy to camouflage, and it is not easy to be misjudged.

4. Application of infrared thermal imaging inspection and quarantine
In recent years, the aviation business of the airport has developed rapidly, with more than a thousand inbound and outbound passengers every day. There is a large flow of people entering and exiting airports and ports in various countries, busy and crowded, and the situation is complicated. The corresponding inspection and quarantine tasks for entry and exit personnel Very heavy. At the same time, in recent years, with the spread and raging of infectious diseases such as SARS and avian flu, traditional inspection and quarantine work is facing increasingly severe challenges. In order to ensure the safe and smooth customs clearance of inbound and outbound passengers under the new situation, innovative thinking and innovative methods are needed. The use of a more automated infrared body temperature monitoring system is a better technical choice.