In nature, objects above absolute zero (-273.15 ° C) can emit infrared radiation. Since infrared rays are invisible light, infrared detectors rely on the temperature difference between the target and its background to identify objects. If the temperature difference is large, the infrared detector will easily detect the target.
Based on the principle of infrared thermal imaging, people often ask whether infrared rays can penetrate the wall. The answer is no, because the wall has a certain thickness that blocks the infrared rays emitted by the target. That is, because the wall is thick enough, it has strong insulation and can block infrared radiation from the other side. Therefore, infrared rays cannot penetrate walls.
Infrared rays also cannot penetrate glass. Glass, like walls, blocks infrared rays emitted from a target. However, people can see their own reflection on glass through infrared thermal imaging. Because glass reflects our infrared radiation, we can see ourselves in the glass. Many people may wonder, isn't infrared camera also made of glass? This kind of glass is different from ordinary glass. It is mainly made of germanium, silicon and other materials. These materials have high infrared transmittance, high chemical stability and strong thermal stability. Their main function is to collect and concentrate infrared radiation from the target.
Although infrared thermal imager cannot observe targets through wall and glass, it can break through bad weather such as night obstacles, haze, dust and glare, and is able to work 24/7. It is an important extension of human vision and has a strong function, so it is usually misunderstood by people as “perspective”. But that’s not really the point. Due to these advantages, it can be widely applied in many fields such as security monitoring, industry, architecture, law enforcement search and rescue, animal protection, aerospace etc.
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Uncooled Infrared Detectors
Uncooled Thermal Modules
Cooled Infrared Detectors
Cooled Thermal Modules