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directional 5hz frequency to put out a cigarette?
directional 5hz frequency to put out a cigarette?
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Old 7th June 2020, 03:10 AM   #1
itsmejonny is offline itsmejonny
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Default directional 5hz frequency to put out a cigarette?

Ive kinda got an idea to make a contraption that will put out a cigarette from a distance with the 5hz frequency. I started by looking up what frequency puts out fire and then an article led me to infrasonic. Anyone know the direction I need to go to build this thing? Thanks for any help before hand. Have a great day!
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Old 7th June 2020, 05:29 AM   #2
PRR is online now PRR  United States
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directional 5hz frequency to put out a cigarette?
> put out a cigarette from a distance

Garden hose.

A directional sound source with useful efficiency is big in inverse proportion to frequency. To get a 60 degree beam at 1,000Hz you need a mouth about a foot across. At 5Hz this will be about 200 feet. 60 degrees is a very wide beam, and most of the energy will miss a 101mm cigarette. You really want less than 1 degree. So 60 times bigger, 12,000 feet or a 2-mile mouth.

There are end-fired arrays which use less mouth but more length, and still trade-off efficiency for "size". You could maybe do 5000 feet long and 10 feet wide.
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Old 7th June 2020, 06:47 AM   #3
TNT is offline TNT  Sweden
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What distance?

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Old 7th June 2020, 08:00 AM   #4
Elvee is offline Elvee  Belgium
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A vortex ring might be able to it: it is a kind of soliton, a single wave that can propagate at great distances without losing too much energy or compactness:
Vortex ring - Wikipedia
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Old 7th June 2020, 08:22 AM   #5
edbarx is offline edbarx  Malta
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@ PRR:

OMG, that was hilarious! And explained from a technical point of view too with calculations.

To put out a cigarette you can use carbon dioxide if want to go the expensive way. If you want to be cooler, you can use argon or pure nitrogen. AND... if you want to do it the Flintstones way, you can use a small rock and press the burning tip against it.
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Old 7th June 2020, 12:36 PM   #6
itsmejonny is offline itsmejonny
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@PRR Thanks for the reply. Honestly, its just a funny idea i had.well, I was thinking about how smokers smoke within that 100ft from the door of businesses . What if you could create a way to use sound to extinguish the cigarette from say within @tnt 100ft. I was thinking that first you could use a infrared sensor to locate the ember and direct some sorta wave to extinguish it, but then how would you extinguish it from that distance.LOL!! I dont know, I have these little ideas that I find humorous and wonder if its possible to do.Thanks ya'll for your reply's both humorous and humorous.
@elvee not sure a what a vortex ring is. @edbarx yeah thats too easy lets get more creative than that.
Anyways, thanks everyone for the ideas
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Old 7th June 2020, 01:43 PM   #7
edbarx is offline edbarx  Malta
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Another way is to use a smoke sensor but you have to create one that smells tobacco smoke. The sensor would send a signal to a computer which plays a sound track instructing customers smoking is not allowed. In this way you are less invasive and you can use polite language in the message.
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Old 7th June 2020, 02:49 PM   #8
JMFahey is offline JMFahey  Argentina
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Quote:
Originally Posted by itsmejonny View Post
Ive kinda got an idea to make a contraption that will put out a cigarette from a distance with the 5hz frequency. I started by looking up what frequency puts out fire and then an article led me to infrasonic. Anyone know the direction I need to go to build this thing? Thanks for any help before hand. Have a great day!
Short answer: you can not do that.

Not sure where you got that idea from, which is wrong on so many points, but for one, for all practical means 5Hz waves are not directional so you will never ever be able to focus that wave on a cigarette.

Besides, to get enough sound pressure 100 ft away, SPL at the source would need to be horrendous.

Doubt a stick of dynamite would put out a cigarette 100 ft away, and even if it did, (iffy) , that will show the pressures involved.
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Old 7th June 2020, 02:52 PM   #9
Galu is offline Galu  Scotland
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In Scotland, we have a sonic weapon called 'the bagpipes'.

A quick skirl of the pipes and even the most ardent smoker will head for cover!
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Old 7th June 2020, 03:46 PM   #10
Enzo is offline Enzo  United States
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Even if you could direct a concentrated blow of air, well, what happens when you draw extra air through a cigarette? It simply burns better.
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