The emergence of the infrared life detector did not happen by chance; it was driven by an urgent need for efficient and precise search and rescue technologies in response to major natural disasters such as earthquakes, mining accidents, and building collapses. This device utilizes infrared thermal imaging technology to detect and locate survivors. Its core principle is based on the fact that any object with a temperature above absolute zero (-273.15°C) continuously emits infrared radiation.
The human body acts as a natural source of infrared radiation, with skin emissions primarily concentrated in the 3 to 50 micrometer range, particularly centered around a wavelength of approximately 9.4 micrometers. Surrounding debris materials, such as bricks and concrete, have different radiation characteristics compared to the human body. The infrared life detector operates precisely by capturing this temperature difference, separating human body heat from the background. Specifically, the device uses an optical system to focus the received thermal radiation energy from the human body onto an infrared sensor, where it is converted into an electrical signal. After processing, this signal is ultimately displayed as an infrared thermal image on a monitor, thereby helping rescue personnel quickly determine the exact location of trapped individuals.
This technology enables the infrared life detector to function effectively in post-disaster environments with thick smoke, fire, or darkness—conditions where visibility is extremely low. It is particularly suited for detecting survivors buried deep under rubble, in mines, or within narrow crevices, where rescue workers cannot directly see or reach them. As the technology has continuously transitioned from military to civilian rescue applications, the infrared life detector has become an indispensable piece of equipment in modern rescue operations, providing crucial technological support for saving lives within the golden rescue window.
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