Extinguishing fire with sound waves
Resonance started as part of university course "Hacking for
Startups" and has never left prototyping phase.
The during the time of the class developed prototype is able to extinguish fire from approx. 1m distance using sound waves - nothing else.
It is a device usable many times in a row without the need of refuelling or maintenance and is therefore much less of a sustainable impact to gaseous extinction methods like Hydrofluorocarbons (HFCs).
This device is perfectly suited for situations and circumstances in which gaseous extinguishing would not be the best option. These cases might be:
A space station, in which the atmosphere shall not be contaminated; Frequently used CO2 extinguishers could be fatal!
A server farm / computing centre in which hydrous liquids could damage electronics;
Any situation that needs short-distance automated fire extinction.
Liquid extinguishing has its drawbacks, mainly damaging its surroundings in-situ.
Water damage in domestic, mainly in the kitchen originating, fire extinctions account for the majority of damages to a home. Thus, sonic fire suppression and extinction could be a viable option for insurance corporations aiming at lowering costs for fire damage - Having to cover / replace only actually by fire damaged goods.
How it works
A flame is a mixture of reacting gases and solids emitting visible, infrared, and sometimes ultraviolet light. The frequency spectrum of flames depends on the chemical composition of the burning material and reaction products
Thus, the gaseous components of the fire can be altered to change
the flame in general. This is the underlying concept of
extinguishing fire, we want to drive away the oxygen molecules from
the oxidation site and inject more Nitrogen molecules and others to
"suffocate" the flame.
Atmospheric attenuation and vibrational frequencies of molecules are the two fundamental concepts of how this method works.
The vibrational frequency of "air" is utilised to create "winds" - changing currents in the composition of the atmosphere.
These currents, when directed at a flame, are strong enough to drive away oxygen molecules and effectively stops the fire.