Encode information in fire!----make money online

I have a strip of flash paper on the

bench here that I cut out from a larger

sheet and cut it so that there was a

little tab sticking out every so often

along the length of the strip and aiming

at it I have an optical sensor in this

aluminum box and the sensor is attached

to the oscilloscope so let's see what

happens when I light the flash paper as

you can see the flame is larger when it

gets to one of the tabs because there is

an increased amount of fuel there and as

we can see in the oscilloscope there's a

slight change in the signal where we

were burning one of the larger pieces of

flash paper so what we've done is

effectively encoded information into the

strip of flash paper I originally got

this idea when I was searching the web

for another topic and came across

something called info fuses this is a

project started by a group at Harvard

and our idea was to take a strip of

flash paper like this and flash paper is

just pure nitrocellulose you basically

start with paper and you nitrate it

using sulfuric and nitric acids so that

it burns very cleanly and very quickly

anyway so they took the strip of flash

paper and added to it drops of metal

salts along its length so maybe you've

seen the classic chemistry experiment

where you turn a flame a different color

by adding metal salts so for example if

you soak a candle wick in potassium

potassium salt it burns purple and if

you use strontium it burns red so if you

added a little drop of each one of those

metal salts along the strip as it burned

down the flame color would suddenly

change and then change back the reason

that this burns with an orange flame is

because of sodium ions that are just

present in the washing process like it's

basically just a contaminant so you

always have that color but if you add

just a little drop of potassium right

here as the flame burns along it will

change to purple briefly and then change

back to just the background orange color

the info fuse group pointed out that you

could actually multiplex this so instead

of just putting purple here and green

here and red here you could actually put

the same colors on the same spot of the

strip

could have purple plus red here and

green plus purple here and by using

different metal salts you always get

exactly the same color so it's easy to

put more than one color at the same spot

and then if you have a very sensitive

color detector as the fuse burns down

you can very accurately find which

colors you are getting and you can

encode quite a bit of information that

way so I thought it might be interesting

to encode information and sort of an

amplitude scheme instead of the color

scheme at the Harvard group used so I

tried making strips with different sized

tabs on them and was able to you know

kind of encode information you can

basically see the the location of the

tabs that I cut on to the strip here but

what I really wanted to do was to have

more than one strip interact with each

other so I thought it might be possible

to have information encoded into a strip

by giving it a certain tab pattern and

then laying it next to another strip

with its own tab pattern and by setting

the whole thing on fire there might be

some sort of an interesting computation

and I thought about this for quite a

while and I'm not sure it's actually

possible I wish I had a better

background in computer science or

information theory it would seem like

the energy from the flame might actually

provide the energy for computation and

if you are able to actually encode the

the information in the strips in some

interesting way you could actually get a

real result out of it I started thinking

about what properties of flame has that

would actually allow the computation of

information to occur and basically the

idea is that the flame is just able to

ignite things that are near it it's not

like a mechanical lever so you can't

really build a mechanical computer out

of it or at least not in any way that I

could see and so really the best thing

about this whole burning paper situation

is that it's sequential and the the

flame provides this readout effect just

because there's sort of more paper in

one area than another if we were

actually going to build a computer out

of this system I think it would have to

be a multi flame process for your one

flame would have to burn certain links

between the two strips and then you have

to use another flame to actually get the

readout although like I say I thought

about this for quite a while and

couldn't come up with anything so I'm

interested to hear what you guys think

is there a way to actually do

computation with nothing but flash paper

basically I have a vinyl cutter and I

was thinking of cutting a fairly

intricate set of tabs into these things

so I can do that

another slightly disappointing thing is

that the resolution is quite poor so the

tabs have to be very large and spaced

fairly far apart for this system to work

let's take a look inside the aluminium

box I only needed to add this metal

boxes because I was having problems with

interference and so inside here it's a

very simple circuit it's just a 9-volt

battery and a resistor and Hama Matsu s

7815 photo sensor this is an amplified

photo diode and so it's very easy to use

in circuit because you just need one

resistor and then you have a nice high

voltage signal coming out and it's

fairly sensitive I'll put the link in

the description let's try another one

this time I just laid another strip of

flash paper across the the main strip

another thing to note is you can't put

it flat down on the bench because the

bench will actually suck the heat away

from the flame front too quickly so you

actually have to bend it into a little

triangle to suspend itself above the

bench surface and that will keep the

flame front hot enough for it to

continue moving

so with this one you can see the signal

from the optical sensor here and the

background is not quite as steady as you

would think like as it burned down to

the edge here we were really dropping

off so the Harvard groups approach of

using colors to encode information is

very smart because they can subtract the

background sodium signal and still reno

obtain the color signal just fine okay

well let me know if you have any

thoughts about computing with fire I

think it's a pretty cool topic even

though I'm not sure there are actually

any practical applications playing with

this flash paper is a lot of fun see you

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