Holographic buttons for contactless control of equipment. Free Technical Library News

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Holographic buttons for contactless control of equipment

25.02.2021

Specialists of the Japanese company Murakami have developed holographic buttons for non-contact control of equipment. They are supposed to be used in public toilets so that a person comes into less contact with surfaces.

The development works on the principle of touch displays, however, in this case, the image is not displayed on the surface, but is projected in the air. To press the button, you only need to touch it in the air, that is, there is no need to contact the surface.

It is known that the hologram itself is projected by means of a special light source and a large number of mirrors. Recognition, in turn, is carried out thanks to infrared sensors. It is assumed that holographic buttons can be implemented even in ordinary doors to avoid touching the handles.

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Metal and glass welding 02.03.2019

Scientists from Heriot-Watt University have welded glass and metal together using an ultra-fast laser system - a real revolution in the industry!

Thanks to the Heriot-Watt specialists' new laser system, various optical materials such as quartz, borosilicate glass and even sapphire have been successfully welded to metals such as aluminum, titanium and stainless steel. The equipment delivers very short (picosecond) pulses of infrared light at the junction of materials, which helps to effectively fuse them together. Scientists have already noted the enormous potential of such welding for the entire production base of the near future. This process could find applications in aerospace, defense, optical, and even health care.

Professor Duncan Hand, director of the EPSRC Manufacturing Innovation Center at Heriot-Watt University, explains that traditionally dissimilar materials are very difficult to weld together due to their different melting points. High temperatures and structural changes due to thermal expansion lead to the destruction of brittle materials such as glass.

“Currently, equipment and products that use glass and metal most often hold these two materials together with glue. It is unreliable, because over time the glued parts begin to spread in different directions. In addition, the organic components of the glue emit volatile compounds, which also negatively impacts the life of the product," says Hand.

In his own technique, the whole process is based on incredibly short laser pulses. Each pulse lasts only a few picoseconds.

"To understand how small it is - compare an ordinary second with a time interval of 30 years!" he explains.

The parts to be welded are placed in close contact and the laser is focused through the optics to provide a small area of effect and high intensity at the joint boundary. So, during the tests, the peak power was one megawatt - and this is on an area of \u50b\u90bjust a few microns. This is how a microplasma, a tiny sphere-lightning, arises inside the melt region, which fuses the materials. The seams have been tested for strength from -XNUMX°C to XNUMX° and come out unscathed - a great guarantee that they will not fail in extreme environments such as outer space.

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