Author Topic: Laser cleaning.  (Read 9118 times)

0 Members and 1 Guest are viewing this topic.

Offline firewalker

  • Super Contributor
  • ***
  • Posts: 2350
  • Country: gr
Laser cleaning.
« on: March 12, 2016, 08:59:53 pm »
Any idea how this thing works? Is it just a high power short pulse laser? Or a laser+plasma thing?



Become a realist, stay a dreamer.

 

Offline continuo

  • Frequent Contributor
  • **
  • Posts: 303
  • Country: de
Re: Laser cleaning.
« Reply #1 on: March 12, 2016, 09:11:04 pm »
http://www.cleanlaser.de/wEnglish/unternehmen/unternehmen.php?navanchor=2110029


I think it's just a high power short pulsed laser. Vaporizes parts of the paint and the high-speed expanding gasses literally blow the debris away.
 

Offline elgonzo

  • Supporter
  • ****
  • Posts: 690
  • Country: 00
Re: Laser cleaning.
« Reply #2 on: March 12, 2016, 09:30:05 pm »
1. Video: Pay attention when watching the video. It tells you right in the beginning what laser is being used. Hint: Did you see the mention of Q-switching?

2. Video: I don't know. Why don't you go to the manufacturers website (hint: YT description of video contains link to manufacturer website) and see what information you can find...
 

Offline chris_leyson

  • Super Contributor
  • ***
  • Posts: 1506
  • Country: wales
Re: Laser cleaning.
« Reply #3 on: March 12, 2016, 09:33:05 pm »
I think it's pulsed, very high power short pulses. The Nd:YAG laser is probably multiplied by 2 and then by 2 or 3 to get it into the UV range. 1kW average power makes it quite some beast of a laser, would have to know the pulse width and pulse rate to figure out the energy delivered per pulse. Seen Nd:YAG used for wire marking, 177nm, and for stripping varnish of large copper wires, 532nm. I've heard high power Q switched lasers ionize air, I wasn't allowed to watch but it went off with a very loud bang.

An impressive setup, especially considering that they deliver it down a fiber.
 

Offline rx8pilot

  • Super Contributor
  • ***
  • Posts: 3603
  • Country: us
  • If you want more money, be more valuable.
Re: Laser cleaning.
« Reply #4 on: March 12, 2016, 10:00:41 pm »
I am officially scared of that thing. Not quite as much as the US army shoulder mounted nuke launcher, but close.

Sent from my horrible mobile....

Factory400 - the worlds smallest factory. https://www.youtube.com/c/Factory400
 

Offline continuo

  • Frequent Contributor
  • **
  • Posts: 303
  • Country: de
Re: Laser cleaning.
« Reply #5 on: March 12, 2016, 10:05:08 pm »
Looks kinda similar to a Star Trek Phaser gun  :-DD

What puzzles me most: He doesn't wear any skin protection, no gloves, no face shield, no respiratory mask  :-//
 

Offline Whales

  • Super Contributor
  • ***
  • Posts: 1073
  • Country: au
    • Halestrom
Re: Laser cleaning.
« Reply #6 on: March 12, 2016, 10:17:03 pm »
This would smell delicious.  RIP lungs.

Offline chris_leyson

  • Super Contributor
  • ***
  • Posts: 1506
  • Country: wales
Re: Laser cleaning.
« Reply #7 on: March 12, 2016, 11:21:35 pm »
I noticed in the first video, the guys' laser safety glasses don't fit correctly, you can see his eye balls at about 10 seconds in.

A some points in the video you can see the colour of the beam, at 3.27 for example, so I'm guessing it's maybe trippled up to 350nm.
Longwave UV isn't as harmful as shortwave UV and they must have measured the reflected power from the surface being cleaned. Anyway, I would opt for full face protection at those sort of power levels and maybe something with positive air pressure as well.

The line generator in the hand held part probably uses scanning optics, that way you delivery full power at one point on the line, enough to ablate the paint at that point whereas a line generator optic would distribute the power over the whole line and that wouldn't be enough. It's scary but still a damn good piece of engineering  :-+
 

Online blueskull

  • Supporter
  • ****
  • Posts: 14198
  • Country: cn
  • Power Electronics Guy
Re: Laser cleaning.
« Reply #8 on: March 13, 2016, 12:27:32 am »
I think it's pulsed, very high power short pulses. The Nd:YAG laser is probably multiplied by 2 and then by 2 or 3 to get it into the UV range. 1kW average power makes it quite some beast of a laser, would have to know the pulse width and pulse rate to figure out the energy delivered per pulse. Seen Nd:YAG used for wire marking, 177nm, and for stripping varnish of large copper wires, 532nm. I've heard high power Q switched lasers ionize air, I wasn't allowed to watch but it went off with a very loud bang.

An impressive setup, especially considering that they deliver it down a fiber.

The first video looks like an IR laser, so it should be operating at fundamental frequency. The second one remains unknown, but I think 1064 should be fine, otherwise the guy without safety goggles would have been blinded instantly if it was 532 laser.

1kW? Sounds fishy. A 50w Q switched setup sells for $10k on ebay, a 1kw should be at least 100k. No one will buy a paint stripper for 100k. Also, from the yellowish glowing, I suspect the 1kw is actually 1kw CW plus a couple tens of watts QSW. The pulse laser uses its high peak power to loosen the structure, then the CW laser does its job -- heat the rust or paint, create micro blast, finally blow away particles from surface.
 

Online mariush

  • Super Contributor
  • ***
  • Posts: 4008
  • Country: ro
  • .
Re: Laser cleaning.
« Reply #9 on: March 13, 2016, 02:48:28 am »
http://youtu.be/CKbuRAyKRsU

Laser Cleaning with High Power Short Pulse Laser

    Laser cleaning is a process that removes scale, oxides, dust and oil from materials. Using a short-pulse laser, the surface is cleaned to the bare metal quickly and with minimal heat affect. It can be an in-line or batch process performed directly prior to a process that requires a clean, bare metal surface. The fiber delivered TRUMPF TruMicro 7050 accomplishes this with a laser power of 750 watts and a pulse duration of 30 ns.




There was a very thorough explanation on reddit somewhere but it's hard to find. The guy explained exactly how the laser in one of the first two videos worked...
Anyway, don't worry about it, the 500w version of such laser cleaner costs about $300k so ....

ps. There's https://www.reddit.com/r/LaserCleaningPorn/  ... lots of videos with lasers.

 

Offline matseng

  • Frequent Contributor
  • **
  • Posts: 564
  • Country: se
    • My Github
Re: Laser cleaning.
« Reply #10 on: March 13, 2016, 08:00:48 am »
Seems like it removes lead pencil marks on paper. I wonder how good it is to remove rollerball pen writings from a cheque?  :scared:



 

Offline Augustus

  • Regular Contributor
  • *
  • Posts: 233
  • Country: de
Re: Laser cleaning.
« Reply #11 on: March 13, 2016, 08:36:01 am »
Maybe it's also good on removing an Arschgeweih from the Arsch. No, no further explanation. If you're interested what it is do an google image search. At your own risk  :-DD
Greetings from the Black Forest, Germany
 

Offline matseng

  • Frequent Contributor
  • **
  • Posts: 564
  • Country: se
    • My Github
Re: Laser cleaning.
« Reply #12 on: March 13, 2016, 08:50:00 am »
Hm... Yes. I studied Deutsch in school for 6 years like 35 years ago.  Haven't used it since excel for ordering beer an few times in Munich.  But I still remember enough for getting the gist of that....  :palm:
 

Offline SeanB

  • Super Contributor
  • ***
  • Posts: 15434
  • Country: za
Re: Laser cleaning.
« Reply #13 on: March 13, 2016, 08:59:16 am »
German versions tend to be better looking though......
 

Offline rs20

  • Super Contributor
  • ***
  • Posts: 2198
  • Country: au
Re: Laser cleaning.
« Reply #14 on: March 13, 2016, 10:07:50 am »
Watching these, I sometimes think -- "How does the laser 'know' that paint is unwanted, but metal is fine? That leaded pencil is unwanted, but paper is fine?"

Then you remember that they pointed the laser at a whole bunch of things, and then contrived usecases (in quote marks in the case of erasing pencil). But hey, a contrived usecase is perfectly real for people that really have that usecase!
 

Offline chris_leyson

  • Super Contributor
  • ***
  • Posts: 1506
  • Country: wales
Re: Laser cleaning.
« Reply #15 on: March 13, 2016, 10:27:15 am »
Blueskull, they tripple the laser frequency after the Q switch with a non linear crystal, 1064/3 = 350nm. If it were IR they might as well use a CO2 a lot cheaper.
 

Offline chris_leyson

  • Super Contributor
  • ***
  • Posts: 1506
  • Country: wales
Re: Laser cleaning.
« Reply #16 on: March 13, 2016, 11:36:41 am »
On second thoughts, maybe they don't tripple the laser frequency and it is pulsed IR at 1064nm. Depends on where paint absorbs the most power.
 

Offline XOIIO

  • Super Contributor
  • ***
  • Posts: 1592
  • Country: ca
Re: Laser cleaning.
« Reply #17 on: March 13, 2016, 11:51:21 am »
I am officially scared of that thing. Not quite as much as the US army shoulder mounted nuke launcher, but close.

Sent from my horrible mobile....

Wait, they made a working fat man?

Online mariush

  • Super Contributor
  • ***
  • Posts: 4008
  • Country: ro
  • .
Re: Laser cleaning.
« Reply #18 on: March 13, 2016, 12:00:59 pm »
 

Offline amyk

  • Super Contributor
  • ***
  • Posts: 6956
Re: Laser cleaning.
« Reply #19 on: March 13, 2016, 03:09:21 pm »
Who else thought this thread would be about cleaning a laser before they clicked?
 

Online blueskull

  • Supporter
  • ****
  • Posts: 14198
  • Country: cn
  • Power Electronics Guy
Re: Laser cleaning.
« Reply #20 on: March 13, 2016, 09:26:27 pm »
Who else thought this thread would be about cleaning a laser before they clicked?

Then it would be cleaning laser.
 

Offline rs20

  • Super Contributor
  • ***
  • Posts: 2198
  • Country: au
Re: Laser cleaning.
« Reply #21 on: March 13, 2016, 09:28:12 pm »
Who else thought this thread would be about cleaning a laser before they clicked?

Not sure if joking, but this got me thinking. The answer in my case is "no, I understood it to mean cleaning using a laser". There's plenty of other examples of this pattern:
Sand blasting
Powder coating
Air brushing
Oil painting
Laser printing / inkjet printing
Water blasting

 

Offline rs20

  • Super Contributor
  • ***
  • Posts: 2198
  • Country: au
Re: Laser cleaning.
« Reply #22 on: March 13, 2016, 09:31:59 pm »
Then it would be cleaning laser.

Still not quite, a cleaning laser is a laser that cleans. "Cleaning a laser", " Cleaning my laser", or "Cleaning lasers" (which is truly ambiguous) would be the ticket.
 

Offline Marco

  • Super Contributor
  • ***
  • Posts: 4924
  • Country: nl
Re: Laser cleaning.
« Reply #23 on: March 13, 2016, 11:46:48 pm »
Blueskull, they tripple the laser frequency after the Q switch with a non linear crystal, 1064/3 = 350nm. If it were IR they might as well use a CO2 a lot cheaper.

Q-switching is more difficult for CO2 lasers, that said reflectivity at UV of steel is much less.
« Last Edit: March 13, 2016, 11:50:44 pm by Marco »
 


Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo
Smf