Any object with a temperature emits infrared rays. The thermal imager receives the infrared rays emitted by the object. The color image shows the temperature distribution on the surface of the object to be measured, and the abnormal temperature point is found based on the slight difference in temperature. With the role of maintenance. It is also commonly referred to as an infrared camera.
The thermal imaging camera's working principle is thermal infrared imaging technology. Its core is the thermal imager, which is a sensor that can detect very small temperature differences, and converts temperature differences into real-time video images. However, only the hot porch of people and objects can be seen, and the true appearance of objects cannot be seen.
working principle
Natural light is composed of light waves with different wavelengths. The visible range of the human eye is approximately 390-780 nm. Electromagnetic waves shorter than 390 nm and electromagnetic waves longer than 780 nm cannot be perceived by human eyes. Electromagnetic waves with a wavelength less than 390 nm are located outside the visible spectrum purple and are called ultraviolet rays. Electromagnetic waves longer than 780 nm are located outside the visible spectrum red, and are called infrared rays, and their wavelengths range from 780 nm to 1 mm.
Infrared is an electromagnetic wave having a wavelength between microwave and visible light, and has the same essence as radio waves and visible light. In nature, all objects whose absolute temperature is above -273.15°C continuously emit infrared rays. This phenomenon is called thermal radiation. Infrared thermal imaging technology uses micro-thermal radiation detectors, optical imaging objectives, and an opto-mechanical scanning system to receive the infrared radiation signal of the measured object. After spectral filtering and spatial filtering, the focused infrared radiation energy distribution pattern is reflected on the photosensitive element of the infrared detector. In the above, the infrared thermal image of the object to be measured is scanned and focused on a unit or a spectroscopic detector. The detector converts the infrared radiant energy into an electric signal and the amplified signal is converted into a standard video signal to be displayed on a television screen or a monitor. Infrared thermal image.
Advantage:
1 Full consciousness 2 Can be used normally during the day and night 3 Extreme weather can be used 4 Obstructions such as fog, rain and smoke can be seen 5 All heating objects have no place to hide at night or in bad weather conditions.
Due to well-known reasons, visible light equipment can no longer work properly. If artificial lighting is used, it is easy to expose the target. If low-vision night vision equipment is used, it also works in the visible light range and still requires external light illumination. The infrared thermal imager passively accepts the target's own infrared thermal radiation, and can work normally both during the day and night, and will not expose itself. Also in rain, fog and other harsh weather conditions, due to the short wavelength of visible light, poor ability to overcome obstacles, so the observation effect is poor, but the infrared wavelength is longer, especially in the thermal imager working on 8 ~ 14um, through The ability of rain and fog is high, so the target can still be observed normally. Therefore, at night and in bad weather conditions, infrared thermal imaging monitoring equipment can monitor various targets such as people and vehicles.
Fire monitoring
Since the infrared thermal imager is an imaging device that reflects the surface temperature of an object, it can be used as an on-site monitor in addition to nighttime. It can also be used as an effective fire alarm device. In large-area forests, fires are often caused by invisible fires. of. This is the root cause of devastating fires. With the existing common methods, it is difficult to find such hidden fire signs. The use of infrared thermal imager can quickly and effectively find these hidden flames, and can accurately determine the location and scope of the fire, through the smoke found that the fire point, so that as early as possible to prevent early, extinguished as early as possible.
Identification of camouflage and concealed targets Common camouflage is based on preventing visible light observations.
The crimes committed by ordinary criminals are usually hidden in the grass and forests. Due to the harsh environment and human visual illusions, it is easy to make erroneous judgments. The infrared thermal imaging device passively receives the thermal radiation of the target itself, and the temperature and infrared radiation of the human body and the vehicle are generally much larger than the temperature and infrared radiation of the vegetation, so it is not easy to disguise and is not easy to produce erroneous judgments. With the development of optoelectronic information, microelectronics, network communications, digital video, multimedia technology and sensor technology, security monitoring technology has evolved from traditional analog to highly integrated digital, intelligent, and networked. With the increase of market demand, modern high-tech has almost applied or is about to be applied in the security monitoring system. The rapid development of infrared thermal imaging technology in modern sensing technology has also begun to be applied in the security system.
The thermal imaging camera's working principle is thermal infrared imaging technology. Its core is the thermal imager, which is a sensor that can detect very small temperature differences, and converts temperature differences into real-time video images. However, only the hot porch of people and objects can be seen, and the true appearance of objects cannot be seen.
working principle
Natural light is composed of light waves with different wavelengths. The visible range of the human eye is approximately 390-780 nm. Electromagnetic waves shorter than 390 nm and electromagnetic waves longer than 780 nm cannot be perceived by human eyes. Electromagnetic waves with a wavelength less than 390 nm are located outside the visible spectrum purple and are called ultraviolet rays. Electromagnetic waves longer than 780 nm are located outside the visible spectrum red, and are called infrared rays, and their wavelengths range from 780 nm to 1 mm.
Infrared is an electromagnetic wave having a wavelength between microwave and visible light, and has the same essence as radio waves and visible light. In nature, all objects whose absolute temperature is above -273.15°C continuously emit infrared rays. This phenomenon is called thermal radiation. Infrared thermal imaging technology uses micro-thermal radiation detectors, optical imaging objectives, and an opto-mechanical scanning system to receive the infrared radiation signal of the measured object. After spectral filtering and spatial filtering, the focused infrared radiation energy distribution pattern is reflected on the photosensitive element of the infrared detector. In the above, the infrared thermal image of the object to be measured is scanned and focused on a unit or a spectroscopic detector. The detector converts the infrared radiant energy into an electric signal and the amplified signal is converted into a standard video signal to be displayed on a television screen or a monitor. Infrared thermal image.
Advantage:
1 Full consciousness 2 Can be used normally during the day and night 3 Extreme weather can be used 4 Obstructions such as fog, rain and smoke can be seen 5 All heating objects have no place to hide at night or in bad weather conditions.
Due to well-known reasons, visible light equipment can no longer work properly. If artificial lighting is used, it is easy to expose the target. If low-vision night vision equipment is used, it also works in the visible light range and still requires external light illumination. The infrared thermal imager passively accepts the target's own infrared thermal radiation, and can work normally both during the day and night, and will not expose itself. Also in rain, fog and other harsh weather conditions, due to the short wavelength of visible light, poor ability to overcome obstacles, so the observation effect is poor, but the infrared wavelength is longer, especially in the thermal imager working on 8 ~ 14um, through The ability of rain and fog is high, so the target can still be observed normally. Therefore, at night and in bad weather conditions, infrared thermal imaging monitoring equipment can monitor various targets such as people and vehicles.
Fire monitoring
Since the infrared thermal imager is an imaging device that reflects the surface temperature of an object, it can be used as an on-site monitor in addition to nighttime. It can also be used as an effective fire alarm device. In large-area forests, fires are often caused by invisible fires. of. This is the root cause of devastating fires. With the existing common methods, it is difficult to find such hidden fire signs. The use of infrared thermal imager can quickly and effectively find these hidden flames, and can accurately determine the location and scope of the fire, through the smoke found that the fire point, so that as early as possible to prevent early, extinguished as early as possible.
Identification of camouflage and concealed targets Common camouflage is based on preventing visible light observations.
The crimes committed by ordinary criminals are usually hidden in the grass and forests. Due to the harsh environment and human visual illusions, it is easy to make erroneous judgments. The infrared thermal imaging device passively receives the thermal radiation of the target itself, and the temperature and infrared radiation of the human body and the vehicle are generally much larger than the temperature and infrared radiation of the vegetation, so it is not easy to disguise and is not easy to produce erroneous judgments. With the development of optoelectronic information, microelectronics, network communications, digital video, multimedia technology and sensor technology, security monitoring technology has evolved from traditional analog to highly integrated digital, intelligent, and networked. With the increase of market demand, modern high-tech has almost applied or is about to be applied in the security monitoring system. The rapid development of infrared thermal imaging technology in modern sensing technology has also begun to be applied in the security system.
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