Advantages and Working Principles of Infrared Thermal Imaging Cameras
Date of issue: 03-02-2023
Article source: ThermTec
Views: 38

An infrared thermal imaging camera is a camera that displays by receiving infrared rays emitted by objects. Any object with temperature will emit infrared rays. The thermal imager is to receive the infrared rays emitted by the object, displays the temperature distribution on the surface of the measured object through colored pictures, and finds out the abnormal point of temperature according to the slight difference in temperature, so as to play the role of and maintenance. Also commonly known as thermal imaging cameras.


Working Principle


Natural light is composed of light waves with different wavelengths. The visible range of the human eye is roughly 390-780nm. The electromagnetic wave shorter than 390nm and the electromagnetic wave longer than 780nm cannot be felt by the human eye. Among them, electromagnetic waves with wavelengths less than 390nm are located outside the violet of the visible light spectrum and are called ultraviolet rays; electromagnetic waves longer than 780nm are located outside the red of the visible light spectrum and are called infrared rays, and their wavelengths range from 780nm to 1mm.


Infrared rays are electromagnetic waves with wavelengths between microwaves and visible light and have the same nature as radio waves and visible light. In nature, all objects with a temperature higher than absolute zero (-273.15℃) continuously emit infrared rays, a phenomenon called thermal radiation.


Infrared thermal imaging technology is to use a micro thermal radiation detector, optical imaging objective lens, and optical-mechanical scanning system to receive the infrared radiation signal of the measured target. 


After spectral filtering and spatial filtering, the focused infrared radiation energy distribution pattern is reflected in the photosensitive element of the infrared detector. The infrared thermal image of the measured object is scanned and focused on the unit or spectroscopic detector, and the infrared radiation energy is converted into electrical signals by the detectors, amplified and processed, converted into standard video signals, and displayed on a TV screen or monitor. Infrared thermal image.


Advantages of Infrared Thermal Imaging Cameras


First of all, infrared thermal imaging technology is a passive non-contact detection and identification technology, which has good concealment and is not easy to be discovered. Compared with infrared supplementary light products, it can avoid the occurrence of red exposure and other phenomena, and can easily realize concealed monitoring.


Second, infrared radiation is the most widespread radiation in nature, and the atmosphere, smoke clouds, etc. can absorb visible light and near-infrared light but are transparent to 3-5μm and 8-14μm infrared rays. Therefore, using these two wavelength windows, the target to be monitored can be clearly observed on a completely dark night, or in a harsh environment such as rain, snow, and other smoke clouds. It is because of this feature that infrared thermal imaging technology can truly achieve 24h all-weather monitoring.


Third, it can perform intelligent video surveillance and identification of camouflaged and hidden targets. Generally, camouflage is mainly to prevent visible light observation. For example, criminals usually hide in the grass and woods when committing crimes. 


Because of the harsh outdoor environment and human visual illusion, it is easy to make wrong judgments and not recognize them. The infrared thermal imaging camera passively receives the thermal radiation of the target itself. When the human body and the vehicle are hidden in the grass and woods, its temperature and infrared radiation are generally much larger than the temperature and infrared radiation of the grass and trees, so it is easy to be automatically identified.


In addition, ordinary surveillance cameras cannot see the hidden objects hidden under the surface of the luminous object, and cannot effectively detect and identify buried stolen items. Infrared thermal imaging cameras developed using infrared thermal imaging technology can detect and identify, because when a surface is messed up, the thermal profile of the surface will also be destroyed, such as the thermal radiation and compaction of the soil that has been turned over. The soil heat radiation is different. Therefore, buried stolen goods, etc. can be found through this function of the infrared thermal imaging camera.


Fourth, infrared thermal imaging technology can intuitively display the temperature field on the surface of the object, which is not affected by strong light. The widely used infrared thermometer can only display the temperature value of a small area or point on the surface of the object, while infrared thermal imaging equipment Then, the temperature of each point on the surface of the object can be measured at the same time, and the temperature field of the surface of the object can be visually displayed and displayed in the form of an image.


Infrared thermal imaging camera has the advantage of concealed detection function, no need for light can penetrate through bad conditions such as thick smoke and thick fog, and has a visual distance of several kilometers. 


For crowded public places, such as bus stations, railway stations, airports, etc., the inspection and monitoring of infrared thermal imaging cameras can effectively give early warnings, thereby preventing the occurrence of security incidents. Infrared thermal imaging technology can quickly and accurately detect heat-generating items such as fire sources by sensing the infrared radiation emitted by objects and prompt an alarm, notifying security personnel to rush to the scene to control suspicious persons carrying heat sources.


About ThermTec


ThermTec is a global leading manufacturer of products concerning infrared thermal imaging technologies, providing the latest and best thermal technologies and solutions that improves the way people perceive the world, such constructs a safer and more efficient living and working condition for humankinds.

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