Tokyo University of Science and NTT announced on March 17, 2016 that they have developed a basic composition technology for terahertz wave illuminators that ensure visibility in a smoky environment. It has been confirmed that using a prototype matrix illuminator for verifying the principle, a terahertz image of an object of 1.4 m can be obtained in a simulated fire environment in which the visibility of the naked eye is almost zero.
The terahertz wave is an electromagnetic wave whose frequency is between the electric wave and the light, and the wavelength is larger than the infrared ray and the visible light, so that even if it propagates in dust, smoke, and flame, scattering and attenuation do not occur substantially. In addition, compared with radio waves, terahertz waves are not easily spread around and can be used to view the shape of an object. In the use of terahertz wave imaging, the industry has long been studying passive imaging technology by imaging the radiant heat emitted by the object, but at the scene of the fire, the surrounding high-temperature substances and high-temperature smoke also become sources of heat radiation, so it is impossible to obtain Clear image.
Active imaging can be achieved using the terahertz wave illuminator developed this time. It is the terahertz wave emitted by the observer to "see" the smoke or the opposite side according to the wave reflected from the object. By deliberately disturbing the phase of a terahertz wave with a wavelength of 360 μm, the terahertz wave emitted by a plurality of components is concentrated to increase the intensity, and the terahertz wave can be used like a flash of a camera. The matrix illuminator prototyped for the verification principle consists of nine components.
Terahertz images (top) and infrared images (bottom) at various smoke concentrations (Cs). The distance from the object being photographed is 85 cm. (Photo: Tokyo University of Science)
In the future, we will verify the performance of the terahertz wave illuminator developed from the perspective of building fire safety engineering, and promote research and development to increase the penetration distance and reduce the size of the system. The results of this research will be presented at the "Spring Academic Lecture of the 63rd Applied Physics Society of Japan" held on March 19-22, and the "Japan Fire Society Research Conference" held on May 16-17. .
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