Practical uses of Quenching in Phosphors

[mrstevenos]

they don't like copper and galena either - makes for a good whisker diode though

[dent6767]

You are so cool I wish you were my friend so I could learn more from you! dr.b

[derman077]

I have two suggestions. KipKay how to see in the dark. Could you show exactly how to do that? I have a stripped out LCD and I wish to make a drawing tracing table from the lamps. Do you have any ideas on how to do these projects? Thanks for the videos.

[transistorbaluba]

2:41 you mention "...our burycrat is thinkig it poison us". I Norway electronics sell out, have to disposel electronic's for the buyers, or else they are prehidbbed to sell them. bye law.

[xtreme404]

can you get in to xbox 360 kinect ???

i know you are in to crafty stuff! so surprise me!!!!

google  Xbox 360 Kinect Night Vision Test

[jeriellsworth]

@xtreme404 I've been turned off by the lag in the Kinect.

[xtreme404]

@jeriellsworth

:( i know what you mean! :) "xbox slow!!!" can you hack it???

Kinect Night Vision video show that dots on camera right??? i know that is not laser!!

take the same idea and apply that a laser system and could be used to remove snow as they fall???

stupid idea!!! i know fun/ dangerous project!!! can build a rig???

sorry for my lame English!

[ngneer999]

I've always wondered how that worked.  I have a YAG laser marker for writing on wafers. A black light and phosphorescent plate are used to find the IR beam. Always wondered what was going on since it seem counterintuitive. Excellent videos.

[jeriellsworth]

@ngneer999 Jealous of your YAG laser.

[MrThomassss]

Fuck you DHL!

[joesitter20101]

In 1989, I made phosphor screens for X-ray fluoroscopy from scratch. I used a muffle furnace to grow ZnS : Xx : Cl crystals. The activator, Ag was best for fast X-ray fluorescence of visible light but, certain concentrations of Cu would produce very long phosphorescence decay times. I did the same exp. with a NIR laser that you show here. I also stored an image by quenching a screen in a kitchen freezer then, weeks later it could be seen upon warming the screen. Try chilling your phosphor.

[alecjw11]

Can you not get CdS LDRs in america? They're easily available in the UK for about 30p (50 cents)

[jeriellsworth]

@alecjw11 They're getting harder to find. Stupid laws about Cd. Politicians don't have a clue what they're voting on half the time.

[TheChipmunk2008]

@jeriellsworth I think you're being too nice to politicians suggesting they actually have a clue 50% of the time... Banning incandescent lamps was one example. The same government banning them for being so inefficient are actively uprating the streetlights to use more power/cause more light pollution

[muddymuddymuddmann]

FAR OUT!

MUDDy

[myst32YT]

hehehehe if you think government bureaucrats are messing around in your field... come play in mine.. ;-)

[jeriellsworth]

@myst32YT True. Bureaucrats should be required to understand grade school chemistry before passing laws like this.

[nannerin]

You are awesome. And very attrative to boot. Not to swell your ego mind you, but from my perspective you are uniquely unique. Muac!

[spektrum1983]

I have a roll of paper, kinda rubbery and green/yellow on one side that glows when you heat it up or shine light on it, idunno if it's the heat from the light or the actual light. But anyway it makes a mark from a hand for example you you hold it there for a sec. Dunno what I can use this for.

[Matthiaswandel]

I take it you were experimenting with heat from the soldering iron, seeing that you were using it as a pointer?

Whenever I used CDS cells, I found that, though incredibly sensitive, they are quite slow to respond, especially at low light levels. To the point where you can watch the needle move slowly on a meter!

[jeriellsworth]

@Matthiaswandel I was heating with my hot air gun, but I left that footage out, because someone would have called me out about the red-ish glow from the end. I even noticed a change by blowing on it.

Yes. CDS Cells are pretty slow. Depends on the layout of the fingers from what I understand and the nature of the semiconductor. I should mention I tested the LED and blink circuit without the phosphor, so the decay was majority of the phosphor.

[SciStarborne]

I will wear the tinfoil dunce cap once I hit the programming stage of my robot-arm mounted camera project. :)

The varying phosphors are a wonderful thing. Exciting them to monitor decay hadn't occurred to me before. The idea of using sheets impregnated with various emitting chemicals and monitoring through optical fibre seemed an excellent one to use on smart air/spacecraft. Exciting them though and suddenly they flicker and flash like aerial jellyfish. An evocative thought!

[nonsquid]

This is fantastic! What I would like to see is luminescence quenching by gamma radiation. That way you could make a cheap radiation detector that would measure the exposure rate in a gamma field. The cadmium sulfide cell / phosphor could be pumped to different excitation levels with a UV LED then measure the decay time to determine the gamma flux. Any chance you could hold that phosphor near your Americium smoke detector source to see if it gets quenched? (I know it an alpha emitter)

[jeriellsworth]

@nonsquid I'll hold it near an Americium source. I tried several times to make a video spinthariscope without luck.

[Films4You]

Have you stopped advertising the Sharpie , LOL

Use this as a memory device.

[Films4You]

dunce cap for the Easy

[sk7ca]

That christmas dunce cap looks totally awesome! :P really!

[sonicase]

oh boy, billy bass

[capman911]

If this is the same IR that works with a tv remote control. I found out that if you have a cell phone with a camera you can turn on the camera and hold the remote on the other side of the cell phone's camera lens and see the glow that the IR puts out. That way you can test to see if the remote works.

[jeriellsworth]

@capman911 That is a very good way to test if you have a direct line of site for the emitter.

[markiduval]

@capman911 Ooo, I learnt something new. I just grabbed my phone and tested what you said with my tv remote, and yep, I could see the purpleish IR light through the phone screen that I can't see with my eyes alone. Awesome! :D

[Afrotechmods]

Soldering iron as a pointer... hehe every time there's always something subtle

[jeriellsworth]

@Afrotechmods Look how well the tip is tinned.

[nick12882]

Any idea why the audio is bad in the last clip?

[jeriellsworth]

@nick12882 I used the mic on the camera. I need to come up with a better way to capture the audio for the ends.

[nick12882]

@jeriellsworth does your camera have a external mic spot?

[jeriellsworth]

@nick12882 That one doesn't.

[XsavioR38]

I want one! Great concept to use to make a new etchasketch. And your right about the easy thing... even if its after the fact it still jinx's you. I had assembled a board last night and was like "that was easy" , visually it was perfect but solder went into one of the connectors and it couldnt be connected.

[deathventure]

Apple seeds also have trace amounts of arsenic in them.

[jeriellsworth]

@deathventure I think my brother and I learned that the first time watching GI Joe.

[bhtooefr]

Wonder if this method would be useful for laser safety when you have a laser that could emit IR if it's not shielded. If the light goes out, your vision is at risk?

[jeriellsworth]

@bhtooefr Good idea.

[lexichronicle2]

MIT (I think it's they) have produced a tiny fridge for superconductor / this kind of work. it's almost exactly like a TEM, but uses superconducting and quantum tunneling. the hot electrons pass through the barrier, but the cold one's can't get back. it can go REEEEEEEALLY low, cryogenic temperatures. but it's also microscopic and the pump rate is equally tiny. still... it'd be excellent to couple one to squid sensor for hand held medical brain scanning

[lexichronicle2]

The opposite of this is also true.

You can lock the spin states of electrons using a secondary beam.

If you shine a laser through a bose eistein condensate with data on the beam, it will effectively stop, with the data being stored in the spin states. when the storage beam is released, the original beam reappears with the data intact - retention time is gigantic due to quantum probability laws.

This creates mind blowing data densities - waaaaaaaaaaaaaaaaaay beyond a DVD or standard holo disc

[jeriellsworth]

@lexichronicle2 It's that cold condensate thats a downer right now.

[tonsilol]

II like that you are using a soldering iron for pointing at your diagrams :)

and i definitly need to get some of this phosphorus-Zeugs

[jeriellsworth]

@tonsilol BTW. Phosphorous and phosphors are a little different. Wouldn't want you to burn your house down trying this with the wrong stuff. :)