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The following article was published in our article directory on August 6, 2010.
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May Issue and Testing the Fiber Acoustic

Article Category: Society

Author Name: xia zihui

For centuries, man-made fiber refers to the clothing and string of raw materials, to the information age, the significance of fiber becomes a portable data communication network of glass filaments.

However, the MIT Electronics Research Laboratory Associate Professor Youerfenke, the textile or fiber used in these fibers are too passive. In the past decade, his laboratory has been committed to develop more advanced properties of the fiber to the fiber fabric ENERGIES AND around the Nexus.

In the latest issue of the "natural materials" magazine, Fink and collaborators announce a landmark new functional fibers: a kind of voice that can detect and produce the fiber. This fiber applications include: the clothes can be made for the microphone, to capture the voice or the monitoring of bodily functions; or made into a kind of measurable blood flow or brain capillary pressure in the fine monofilament.

The new plastic fiber with asymmetrical elements

Ordinary optical fiber is "pre-products" made, pre-product is a heated, spinning and cooling of large cylindrical single material. In contrast, Fink laboratory developed the fiber, sucked several different materials carefully arranged the geometry so that it can be in the heating and stretching process can remain intact.

New acoustic fiber core is commonly used in plastic microphone. The plastic in the fluorine content in enabling researchers to ensure that its elements in an unbalanced state, the fluorine atoms and hydrogen atoms each, according to the side, even in the process of heating and stretching is also true. Asymmetry of this molecule to make plastics, has an "piezoelectricity", which means that when an electric field applied on it, will change its shape.

In the traditional piezoelectric microphone, the electric field generated by the metal electrode. However, in a fiber microphone, the drawing process causes the metal electrode to lose their shape.

Therefore, the researchers replaced with graphite conductive plastics. Conductive plastics are heated to produce a dense liquid, so as to maintain a higher viscosity than the metal electrodes. This not only prevents the material mixed, more critical is that it also has a normal thickness of the fiber.

Fiber is stretched, the researchers need all the piezoelectric elements arranged in the same direction. At this point, we need a strong electric field (caused thunderstorm lightning than even 20 times the electric field) applied on it. Because the fibers are very narrow in any place, this will destroy the surrounding material produces a tiny lightning bolt.

Voice fiber widely used

Although the manufacturing process requires such a delicate balance, the researchers were able to produce in the lab this functional fiber. If they are connected to a power source, and applying a sinusoidal current (AC cycle is very stable), these fibers will be vibrating. If you make it in the audio frequency vibration, and its close to the ear, you can hear the different notes or sounds issued. In the "natural materials" paper, the researchers measured more strictly acoustic performance fibers. As the water better conductivity than air, the sound, they will be placed on the standard fiber converter sound energy across a water tank, the acoustic energy conversion device that can turn send fibers can detect sound waves, but also can detect issued by the fiber sound waves.

Researchers hope to eventually be able to the performance of the experimental fiber integrated in a single fiber. For example, a strong vibration can change the optical properties of optical reflection, so that the fabric can be optical fiber communication. In addition to wearable microphone and biological sensors, the fiber applications include ocean can Jiance Wang Yi Ji water flow in large area high-resolution sonar imaging Ji Tong, Liyongzhezhong woven into the fabric acoustic Qian Wei Xiang Dangyu of millions of tiny acoustic sensors. The researchers said that using the same mechanism, piezoelectric elements, in turn, can bring electricity into movement.

Keywords: drilling and milling machine,fiberglass insulation pipe,steam clothes iron,

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