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Current issue

ELEKTRO 11/2017 was released on November 6th 2017. Its digital version will be available on November 27th 2017.

Topic: Electrical distribution switchboards and switchboard technology; Rotating electrical machines

Main Article
Analysis of the CFD settings for simulating the temperature field of sinusoidal filter
On-line optimisation of current commutation angles in phases of BLDC motor

SVĚTLO (Light) 5/2017 was released on September 18th 2017. Its digital version will be available on September 18th 2017.

Luminaires and luminous apparatuses
MAYBE STYLE introducing LED design luminaires of German producer Lightnet
TREVOS – new luminaires for industry and offices
How many types of LED panels produces MODUS?
Intelligent LED luminaire RENO PROFI

Interiors lighting
The light in indoor flat interior – questions and answers

Spider Silk Sensors Could Search for Life on Mars

26.10.2015 | IEEE Spectrum | spectrum.ieee.org

Optical sensors made with spider silk could be used to look for trace gases produced by biological processes, according to a researcher who showed how silk could be used in place of conventional optical fibers.

The scientists hunting for life on Mars would like to be able to test for small amounts of ammonia, which might be emitted by the metabolism of microbes, so they need a sensor that can detect that while remaining insensitive to the large amounts of carbon dioxide in the Martian atmosphere.

Spider silk helping find the life on Mars

Spider silk does the trick, says Luc Thévanaz, who heads a research group studying fiber optics and optical sensing at Swiss Federal Institute of Technology of Lausanne. The fiber can carry a beam of light, and when something in the environment affects the fiber, that alters some characteristic of the light beam. The concept is used in strain sensing for bridges and other large structures: If the fiber stretches, it changes the spacing of an optical grating inside, altering the wavelength of the light passing through and alerting monitors to the amount of strain.

Thévanaz and his team tested their concept using the silk dragline from a female Nephila edulis spider. They found they could get good light transmission from the visible to the infrared, up to wavelengths of about 1400 nm. Their best transmission was infrared light at 900 nm, which had optical loss of 4 dB/cm, a measure of how far the light can travel before being absorbed by the material.

Read more at IEEE Spectrum

Image Credit: EPFL

-jk-