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Old 02-23-2007, 04:48 AM #1
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Default Popcorn popping...

Well.....I would post videos, but everyone would fall asleep :'(

I sharpied some popcorn kernels
I left some as-is

I tried with my Laserglow Aries 175 - Smoked like hell - burnt it up, but no pop

I tried it with my DVD burner laser - Smoked like hell - burnt, no pop either

In deperation, I tried my 1.2 Watt 808nm diode - again, smoke, no pop.

Has anyone EVER been able to do this, and if so - using what laser, under what conditions ?

Very depressing - and I was looking forward to a snack


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Old 02-23-2007, 06:03 AM #2
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Default Re: Popcorn popping...

Yeah, you're getting the same results as us over at LC a few months back ;D. Sometimes you just can't replace the microwave..

Maybe try diverging the beam and then converging it back around the kernel so you don't have a concentrated area the laser pokes a hole through? Even so it'd probably be really difficult to get enough heat at the center. I've tried with the RPL before to no luck. I would try with ~10-20W IR tonight but I have to pack for a trip to Houston tomorrow, so I'll try it out when I get back (assuming you guys haven't already managed!)
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Old 02-23-2007, 12:14 PM #3
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Default Re: Popcorn popping...

Doing the popcorn will need some serious energy. So lets say if a herc (CALLING WINDSTRINGS LOL ;D) won't do it then it can only be the bad boys of IR that stand a chance AND certainly a real challenge.
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Old 02-23-2007, 02:39 PM #4
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Default Re: Popcorn popping...

I'm gonna over-drive this little 1.2 watt IR dude today and give it another shot....I think maybe going through an enclosure - similiar to Windstrings underwater match light may work....it would keep the heat, etc all in one small area.....hmmmmmI have an idea ! The little glass vial that eyglass repair kits come in, perhaps ? I dunno - I am a man on a mission now, though ! LOL
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Old 02-24-2007, 02:13 AM #5
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Default Re: Popcorn popping...

Quote:
Originally Posted by SenKat
I'm gonna over-drive *this little 1.2 watt IR dude today and give it another shot....I think maybe going through an enclosure - similiar to Windstrings underwater match light may work....it would keep the heat, etc all in one small area.....hmmmmmI have an idea ! *The little glass vial that eyglass repair kits come in, perhaps ? *I dunno - I am a man on a mission now, though ! LOL
Not quite Tom cruise but you get on it mate
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Old 02-24-2007, 02:32 AM #6
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Default Re: Popcorn popping...

maybe the beam is TOO focused. *perhaps diverging it a bit through a plano convex lens would do the trick. *Add a more even heat to pop the kernel rather than just burn through it.
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Old 02-24-2007, 03:02 AM #7
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Default Re: Popcorn popping...

Yeah - I was thinking maybe dye some vegetable oil BLACK, and heat that up with the kernel in it...maybe that would do it ? I may get my red, my Aries, and my IR all going at once, and watch that kernel go NUTS ! LOL
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Old 02-24-2007, 03:23 AM #8
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Default Re: Popcorn popping...

The popcorn kernel shell must remain intact. The temperature of the entire kernel must be uniformly raised to beyond the boiling point of the residual water (~13%) contained in the kernel. When the strain on the shell from the pressure of the superheated water reaches the breaking point, the shell cracks, the water flashes into steam and puffs the contents.

This points to my suggesting the following experimental methods:

Darken the kernel so it will absorb energy. Using at least two lasers, illuminate the kernel as evenly as possible from opposing sides, ensuring that the beams are not focused but instead cover the entire area of the kernel.

Or, wrap the kernel tightly in aluminum foil, then paint that black; this method uses the foil to conduct heat around and into the kernel and even out the thermal energy.
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Old 02-24-2007, 05:06 AM #9
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Default Re: Popcorn popping...

Hmmmm...I tried coloring the kernel, but did not diffuse the beam enough to avoid poking holes in it ! That is why I was thinking of the enclosed space, or dark colored oil to "boil" the kernel....
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Old 02-24-2007, 05:23 AM #10
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Default Re: Popcorn popping...

SenKat --

There's popcorn with a black hull available. If you burn through, NO pop. Iy needs pressure. Glue a kernal to a slow motor , spin it and heat evenly !!
Seems like a lot of work for a small snack !!

I was poping balloons with my "little yag" tonight !!

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Old 02-24-2007, 06:09 AM #11
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Default Re: Popcorn popping...

You gotta get pics of that YAG in action, man....is it colliminated ? I want pics !!!! Hmmmm...rottessirie popcorn ! Even heating....that may work, too !
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Old 03-05-2007, 12:08 PM #12
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Default Re: Popcorn popping...

Don't popcorn kernels pop from the inside? Hence why a Microwave is used?

I don't think it's possible, but I'll try it when I get my PGLIII 175mW
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Old 08-26-2007, 09:26 PM #13
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Default Re: Popcorn popping...

Yet the Native Americans 40005000 years ago made popcorn (Who I doubt had microwaves back then) using a pot. Also, for one, microwaves do NOT cook from inside-out. Clearly the opposite.

My whole point of that was that you do not need to use a microwave to cook popcorn.
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Old 08-26-2007, 11:47 PM #14
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Default Re: Popcorn popping...

I think it would be close to impossible to do this with a laser of any power level. You can clearly set the husk of the kernal on fire, but that would just make a hole on that side preventing pressure buildup and popping.

To make it pop, you need to heat it evenly from all sides, and hot enough to turn the water inside to steam. This works well in a microwave oven or a pan of hot oil, but doing this with lasers is just crazy. You'd have to bombard it with light from all sides at the same time, so unless you have a dozen or more powerful pointers i wouldn't give it a chance.
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Old 08-26-2007, 11:57 PM #15
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Default Re: Popcorn popping...

YES --- We have popcorn FUSION energy !!

SenKat -- 12 beams on a kernal from all sides --- This would make a great video ;D It might work

I like mine with melted butter !

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Old 08-27-2007, 12:08 AM #16
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Default Re: Popcorn popping...

Quote:
Originally Posted by Benm
I think it would be close to impossible to do this with a laser of any power level. You can clearly set the husk of the kernal on fire, but that would just make a hole on that side preventing pressure buildup and popping.

To make it pop, you need to heat it evenly from all sides, and hot enough to turn the water inside to steam. This works well in a microwave oven or a pan of hot oil, but doing this with lasers is just crazy. You'd have to bombard it with light from all sides at the same time, so unless you have a dozen or more powerful pointers i wouldn't give it a chance.

Microwaves work by sending out waves that vibrate at a high speed. and we all know everything vibrates at a certain frequency and the waves that the microwave sends out vibrates about the same speed as water and we all know that mostly everything contains water. so the waves get the water vibrating fast enough to heat it up. thats why the plate normally doesnt get hot. I think this is right but not 100% sure. someone correct if i am wrong.
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