Thursday, April 9, 2015
Hamamatsu- Nondestructive measurement
Developing sustainable systems for the production goods requires that we change our conventional methods of mass consumption and mass disposal. Nondestructive inspection offers us ways to look inside of things without taking them apart, thus opening the possibility of reducing waste and garbage.
We envision the terahertz cameras for use not only in manufacturing facilities, but also for outdoor applications of nondestructive testing. For example, by using a terahertz cameras to inspect the inside of a building, internal damage could be discovered early and thus help extend the life of the property.
Terahertz waves can penetrate soft materials such as paper or plastics, while at the same time having strong absorption to water. Therfore, they can discover areas that are prone to corrosion due to heavy moisture as well as areas that are already corroded. Terahertz waves do not penetrate metals, so it can be used to find the positions of nails and other metal parts that are covered by heat-insulating materials, ceramics, and wallpaper. This can help make building maintenance more efficient.
In this example, the sample is worm-eaten wood that is covered in wallpaper. In the image captured with terahertz waves, the holes in the wood under the surface of the wallpaper can be clearly observed.
In materials engineering, light element materials such as carbon fiber-reinforced plastics have been gaining attention as an energy-saving and eco-friendly alternative to conventional metallic materials, due to their strength and light weight. For these materials, soft X-rays of a few keV or less are an effective means of observation. By using a compact X-ray source and X-ray reflecting optical elements,
has developed a laboratory-scale
soft X-ray 3D microscope for making 3D structural observations at sub-micron
· This technology uses soft X-rays to visualize the three-dimensional structures inside an object made from light elements.
· Due to the high attenuation coefficient of the light elements for soft X-rays, a high-contrast image of such samples can be obtained.
· In the development of light element materials with low environmental impact, this technology can be useful for the design of such materials or for controlling their microstructure during manufacturing.
Observation of carbon fiber-reinforced plastic
· S. Ohsuka, A. Ohba, S. Onoda, K. Nakamoto, T. Nakano, M. Miyoshi, K. Soda, and T. Hamakubo, “Laboratory-size three-dimensional x-ray microscope with Wolter type I mirror optics and an electron-impact water window x-ray source”,Review of Scientific Instruments 85, 093701 (2014).
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