Drawing color pictures with white light. Free Technical Library News

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Drawing color pictures with white light

02.09.2020

Light painting technology was created by researchers from the National Institute of Standards and Technology (NSIT) in the United States.

Scientists "painted" the masterpiece of the Dutch artist Jan Vermeer "Girl with a Pearl Earring" by illuminating a glass plate with millions of elliptical titanium dioxide nanopolarizers with white light.

Nanopolarizers of various sizes are capable, when irradiated with white light, to capture, emit, and change the polarization of light as its intensity changes. In this way, scientists were able to control the color. Depending on the orientation of the long and short axes of the nanoellipse, it was possible to create red, green, or blue color at each point of the surface.

Vermeer's painting was chosen as an experiment to determine the quality of color reproduction. Scientists have created a miniature copy of the painting, about 1 millimeter in size. At the same time, it is noted that the resulting image was distinguished by high definition, up to the texture of oil paint on canvas.

In practice, this technology can be used to increase the amount of information transmitted over an optical fiber by using color wavelengths. In addition, the technology can be used to make money that is difficult to counterfeit.

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Invisible car speakers 24.11.2022

Korean LG Display showed a new development for cars, a very thin Thin Actuator Sound Solution speaker, which the company called "invisible". Due to their modest size and low weight, such speakers can be placed in the most unexpected and previously inaccessible places, hiding from the eyes as much as possible. Although compact, the Thin Actuator Sound Solution vibrates to deliver rich, three-dimensional sound.

LG managed to reduce the size and weight by removing the voice coil, magnet and other components of traditional speakers. The Actuator Sound Solution uses a so-called film exciter: thanks to it, the device is able to transmit vibration to surrounding materials.

Speaker dimensions - 150 millimeters high and 90 millimeters wide, which is slightly larger than the size of a regular passport. The thickness is only 2,5 millimeters, and the weight is 40 grams. This will allow manufacturers to embed an innovative speaker that does not need to be played in almost any part of the cabin. For example, it can be hidden in the upholstery of the canvas, the central tunnel, the front panel and the head restraints.

In addition, the Actuator Sound Solution does not use rare elements such as neodymium commonly used in speakers. Thanks to this, the device turned out to be even more environmentally friendly.

According to the developers, in terms of sound quality, the novelty is not inferior to standard speakers. The Thin Actuator Sound Solution will go on sale next year.

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