Acoustic Cloaking Device & Metamaterials

The acoustic cloaking device works in all three dimensions, no matter which direction the sound is coming from or where the observer is located. By placing this cloak around an object, the sound waves behave like there is nothing more than a flat surface in their path. 

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Turning to Nature: METAMATERIALS

To achieve this new trick, Cummer and his colleagues turned to the developing field of metamaterialsthe combination of natural materials in repeating patterns to achieve unnatural properties. In the case of the new acoustic cloak, the materials manipulating the behavior of sound waves are simply plastic and air. Once constructed, the device looks like several plastic plates with a repeating pattern of holes poked through them stacked on top of one another to form a sort of pyramid.

To give the illusion that it isn’t there, the cloak must alter the waves’ trajectory to match what they would look like had they had reflected off a flat surface. Because the sound is not reaching the surface beneath, it is traveling a shorter distance and its speed must be slowed to compensate.

Acoustic cloaking device hides objects from sound — ScienceDaily.

Methods of Detection: Electro Active Polymers

Each has a size of 1 cm by 1 cm, and it can rise up by 3 mm when 3 Volts are supplied. The movement of these sheets is controlled by a processor that is connected with the iPhone through the phone’s connector. These EAP sheets only take a minimal amount of energy from the extra battery.

Essentially a visual and movement based alert system which could be adapted to detect invasive signals and let the user know when they are being monitored. This is a similar line of detection to the Electromagentic Field detector I created last year. My task now, is how do I scale this up into the ‘resistance’ archtiecture?

Faceted panel facade used to respond and react to invasive signals

Faceted panel facade used to respond and react to invasive signals

See RFID and Electrmagneticfield reader here:

RFID reader

Speculation on the future of the BT Tower

BT Tower

 

Synth[e]tech[e]cology

Royal College of Art graduate Chang-Yeob Lee has developed a concept to transform the BT Tower in London into a pollution-harvesting high rise tower. The project predicts the eventual redundancy of the 189-metre tower – currently used for telecommunications – and suggests repurposing it as an eco-skyscraper that collects airborne dirt particles and helps to reduce the level of respiratory illness in London

While his project is focused on  a new infrastructure gathering resources from pollutants in the city atmosphere, the valuable commodity in my vision of the future city is the harvesting and analysis of data essentially re-imagining the now redundant telecommunications tower as a harvesting device. More details and ideas on this to follow!