A team of Italian researchers has developed a new imaging technique that uses infrared (IR) digital holography to peer through chaotic conflagrations and capture potentially lifesaving and otherwise hidden details.
Firefighters can see through smoke using current IR camera technology. However, such instruments are blinded by the intense infrared adiation emitted by flames, which overwhelm the sensitive detectors and limit their use in the field. By employing a specialized lens-free technique, the researchers have created a system that is able to cope with the flood of radiation from an environment filled with flames as well as smoke.
In the researchers’ new imaging system, a beam of infrared laser light is widely dispersed throughout a room. Unlike visible light, which cannot penetrate thick smoke and flames, the IR rays pass through largely unhindered. The IR light does, however, reflect off of any objects or people in the room, and the information carried by this reflected light is recorded by a holographic imager. It is then decoded to reveal the objects beyond the smoke and flames. The result is a live, 3-D movie of the room and its contents.
The next step in moving this technology to the field is to develop a portable tripod-based system that houses both the laser source and the IR camera. The systems may also be suitable for fixed installation inside buildings or tunnels. In addition, the team is exploring other applications, most notably in the biomedical field for non-destructive testing of large aerospace composite structures.
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