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Cases and applications
With the advancement of science and technology, surveillance systems have been widely used in various fields. The current video surveillance system mainly uses a combination of visible light cameras, manual monitoring and video recording for daily security protection. However, because visible light cameras are in adverse weather conditions or low illumination, it is difficult to filter out interference to obtain useful video images. Thus, the preventive capability of the entire security system at night or in adverse weather conditions is greatly reduced. Then, infrared thermal imaging technology that can improve the night vision prevention capability has been widely used and developed in the industry.
The technical principle of infrared thermal imaging technology:
In nature, all objects with a temperature above absolute zero (-273.16°C) continuously radiate infrared rays, a phenomenon called thermal radiation. Infrared is a type of light wave invisible to the human eye. Both day and night, objects radiate infrared rays, but no matter how weak or strong they are, people cannot see them. The wavelength of infrared light can be divided into two parts, one is near infrared, with a wavelength of 0.78~2.0 microns; the other is thermal infrared, with a wavelength of 2.0~1000 microns. Since the infrared rays will be absorbed by the atmosphere and other substances during the propagation process, the intensity will decrease. Only the wavelengths of infrared rays are in the bands of 3μ~5μm and 8~12μm, and the penetrating power is better. Therefore, infrared imaging technology mainly uses these two bands. test. Using infrared detector technology and optical imaging target lens technology, the infrared radiation energy distribution pattern of the measured target is reflected on the photosensitive element of the infrared detector, so that an infrared thermal image is obtained, which is similar to the thermal distribution field on the surface of the object. correspond. In simple terms, an infrared thermal imaging camera converts the invisible infrared energy emitted by an object into a visible thermal image.
Thermal imaging cameras (also known as thermal imagers) use infrared detectors and optical imaging objective lenses to receive infrared radiation signals from the objects to be measured. The images are scanned and converted into electrical signals, which are amplified, converted or converted into standard video signals to display infrared thermal images via a television screen or detector. Instruments using this principle are thermographic cameras. They detect small temperature differences and convert them into real-time video images, which are displayed on the monitor. Unlike other night vision systems that require a small amount of light to produce an image, thermal cameras do not require any light source, which makes them the perfect tool for surveillance in dark environments and at night.
Application in the security sector:
1. Infrared thermal imaging technology is used in the fields of homeland security and defense, such as borders and maritime surfaces. Due to the long distance and large coverage area of infrared thermal imaging technology, it can detect people, vehicles, ships and aircraft within a few kilometers.
2. Infrared thermal imaging technology is used in polar expeditions in hostile environments, and in field security deployment and control. Infrared thermal imaging technology can work in day, night and even in bad weather, such as fog, rain and snow; it is not disturbed by strong light, backlight, etc.; it does not radiate electromagnetic waves, it is not easy to expose its own target, and its concealment is good.
3. The fusion of infrared thermal imaging technology and current monitoring equipment can form the dual-spectrum vision function of the monitoring camera, using visible light during the day and infrared light at night, the ability to adapt to the environment is stronger, the monitoring distance is longer, and the efficiency is higher ... .
4. Infrared thermal imaging technology combined with the current intelligent algorithm technology can improve the accuracy of illegal intrusion, border crossing and face detection, and is widely used in the field of perimeter protection.
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