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Current issue

ELEKTRO 7/2020 was released on June 24th 2020. Its digital version will be available on July 24th 2020.

Topic: Cables, conductors and cable engineering

Main Article
New traction power supply technology 25 kV/50 Hz (part 2)

SVĚTLO (Light) 3/2020 was released on June 8th 2020. Its digital version will be available on July 8th 2020.

Professional organizations activities
Announcement: LUMEN V4 2020 is cancelled
What is new in CIE, April 2020

Accessories of lighting installations
Foxtrot as a “Master Control” in Hotel Breukelen
Lighting regulators – control of lighting on the constant level

New Type of Smart Windows Use Liquid to Switch from Clear to Reflective

13. 12. 2017 | The Optical Society | www.osa.org

Researchers have demonstrated prototype windows that switch from reflective to clear with the simple addition of a liquid. The new switchable windows are easy to manufacture and could one day keep parked cars cool in the sun or make office buildings more energy efficient. The technology can also be used to make roof panels that keep houses cool in the summer and warm in the winter.

Although glass that uses an applied voltage to switch from clear to an opaque or tinted state is commercially available, its high cost— around $100 per square foot — has hindered widespread use. The new smart windows contain a plastic panel with a pattern of structures that is retroreflective. This means that rather than reflecting light in all directions like a mirror, it reflects light back in the direction it came from like a bicycle reflector.

Smart window

One of the most promising applications for the new switchable glass may be in cars, where it could be used to change the windshield to a reflective state when the car is parked in the hot sun.

Read more at The Optical Society


Image Credit: Keith Goossen, University of Delaware 

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