Laser pointer discussion. Read/write reviews of laser pointers and laser pointer companies. Learn about all types of laser pointers and lasers





Welcome to Laser Pointer Forums! If you are looking for a laser pointer or want to compare different laser pointer companies, you may want to check out the LPF Laser Pointer Company Database. The link will open in a new window for your convenience.








Green Laser Pointers by Category Blue Laser Pointers by Category Red Laser Pointers by Category
Yellow Laser Pointers by Category Violet Laser Pointers by Category Orange Laser Pointers by Category
Top Laser Pointers by Power - 1 Watt+ Top Laser Pointers by Power - 500mW+ Top Laser Pointers by Power - 250mW+
Laser Pointer Database High Power Laser Pointers Laser Pointer Diodes
Laser Technology Laser Pointer Parts Lasers by Wavelength
Top 10 Laser Pointer Companies Laser Pointer Company Database Visible Beam Laser Pointers


One laser store meets all your needs

























Go Back   Laser Pointer Forums - Discuss Laser Pointers > Lasers > Science & Lasers



LPF List of Laser Pointer Companies (link opens new window)



Reply
 
LinkBack Thread Tools Display Modes
Old 09-16-2010, 05:24 PM #1
Bionic-Badger's Avatar
Class 4 Laser
 
Join Date: Oct 2007
Location: Oregon, USA
Posts: 5,478
Rep Power: 1792
Bionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond repute
Bionic-Badger Bionic-Badger is online now
Class 4 Laser
Bionic-Badger's Avatar
 
Join Date: Oct 2007
Location: Oregon, USA
Posts: 5,478
Rep Power: 1792
Bionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond repute
Default UV dye bleaching

I've read that UV light can bleach organic dyes if applied in strong quantities. However, I don't know what wavelengths are appropriate for this kind of bleaching. There are UV-A (400-315nm), -B (315-280nm), and -C (280-100nm) sources for UV light but which is most effective in general? Could it even be done (effectively) with a 405nm violet laser?

If anybody knows, can you please chime in on this subject.


Bionic-Badger is online now   Reply With Quote







LPF List of Laser Pointer Companies (link opens new window)







Old 09-18-2010, 03:00 PM #2
Cyparagon's Avatar
Class 4 Laser
 
Join Date: Sep 2007
Location: Wisconsin
Posts: 9,141
Rep Power: 9321
Cyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond repute
Cyparagon Cyparagon is online now
Class 4 Laser
Cyparagon's Avatar
 
Join Date: Sep 2007
Location: Wisconsin
Posts: 9,141
Rep Power: 9321
Cyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond repute
Default Re: UV dye bleaching

C is likely the best, followed by B, followed by A. 405 is too long of a wavelength to be able to do it reliably.
__________________
A problem well stated is a problem half solved.
Cyparagon is online now   Reply With Quote
Old 09-18-2010, 03:22 PM #3
Toke's Avatar
Class 3R Laser
 
Join Date: Jul 2010
Location: Copenhagen
Posts: 1,111
Rep Power: 51
Toke has a reputation beyond reputeToke has a reputation beyond reputeToke has a reputation beyond reputeToke has a reputation beyond reputeToke has a reputation beyond reputeToke has a reputation beyond reputeToke has a reputation beyond reputeToke has a reputation beyond reputeToke has a reputation beyond reputeToke has a reputation beyond reputeToke has a reputation beyond repute
Toke Toke is offline
Class 3R Laser
Toke's Avatar
 
Join Date: Jul 2010
Location: Copenhagen
Posts: 1,111
Rep Power: 51
Toke has a reputation beyond reputeToke has a reputation beyond reputeToke has a reputation beyond reputeToke has a reputation beyond reputeToke has a reputation beyond reputeToke has a reputation beyond reputeToke has a reputation beyond reputeToke has a reputation beyond reputeToke has a reputation beyond reputeToke has a reputation beyond reputeToke has a reputation beyond repute
Default Re: UV dye bleaching

Yes, lower wave length is likely best.
However you are likely to need a lot of watts, and will have to consider what you can get at a reasonable price.
Remember to cover up your light box, it is not good for the eyes.
__________________
100mW Odicforce kit.
App. 300mw MiniMag
App 120mW labby
Fan cooled 400mA 12X 405nm flashlight

532nm 150mW Labby.
532nm 50mW in flashlight

1.2W 445nm Yobresal
Basic laser building guide.
Toke is offline   Reply With Quote
Old 09-18-2010, 08:29 PM #4
Bionic-Badger's Avatar
Class 4 Laser
 
Join Date: Oct 2007
Location: Oregon, USA
Posts: 5,478
Rep Power: 1792
Bionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond repute
Bionic-Badger Bionic-Badger is online now
Class 4 Laser
Bionic-Badger's Avatar
 
Join Date: Oct 2007
Location: Oregon, USA
Posts: 5,478
Rep Power: 1792
Bionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond repute
Default Re: UV dye bleaching

Hmm, that's not too bad then. I think those UV fluorescent light bulbs (i.e. without any phosphorescent material on the outside) are relatively cheap.

Definitely want the light box for the cancer bulb.
Bionic-Badger is online now   Reply With Quote
Old 09-18-2010, 08:50 PM #5
00Giorge's Avatar
Class 3R Laser
 
Join Date: Aug 2010
Location: Utah
Posts: 1,930
Rep Power: 125
00Giorge has a reputation beyond repute00Giorge has a reputation beyond repute00Giorge has a reputation beyond repute00Giorge has a reputation beyond repute00Giorge has a reputation beyond repute00Giorge has a reputation beyond repute00Giorge has a reputation beyond repute00Giorge has a reputation beyond repute00Giorge has a reputation beyond repute00Giorge has a reputation beyond repute00Giorge has a reputation beyond repute
00Giorge 00Giorge is offline
Class 3R Laser
00Giorge's Avatar
 
Join Date: Aug 2010
Location: Utah
Posts: 1,930
Rep Power: 125
00Giorge has a reputation beyond repute00Giorge has a reputation beyond repute00Giorge has a reputation beyond repute00Giorge has a reputation beyond repute00Giorge has a reputation beyond repute00Giorge has a reputation beyond repute00Giorge has a reputation beyond repute00Giorge has a reputation beyond repute00Giorge has a reputation beyond repute00Giorge has a reputation beyond repute00Giorge has a reputation beyond repute
Default Re: UV dye bleaching

Quote:
Originally Posted by Bionic-Badger View Post
Hmm, that's not too bad then. I think those UV fluorescent light bulbs (i.e. without any phosphorescent material on the outside) are relatively cheap.

Definitely want the light box for the cancer bulb.
Not to mention a nasty UV burn or sun burn.
__________________
The older I get the better I was!
Age is mind over matter, if you don't mind it really doesn't matter!
Growing old is inevitable, growing up is optional!



Want help stop gun legislation
http://www.ruger.com/micros/advocacy/takeAction.html
00Giorge is offline   Reply With Quote
Old 09-19-2010, 12:26 PM #6
Benm's Avatar
Class 4 Laser
 
Join Date: Aug 2007
Location: Netherlands
Posts: 7,428
Rep Power: 15904
Benm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond repute
Benm Benm is online now
Class 4 Laser
Benm's Avatar
 
Join Date: Aug 2007
Location: Netherlands
Posts: 7,428
Rep Power: 15904
Benm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond repute
Default Re: UV dye bleaching

Quote:
Originally Posted by Bionic-Badger View Post
Hmm, that's not too bad then. I think those UV fluorescent light bulbs (i.e. without any phosphorescent material on the outside) are relatively cheap.

Definitely want the light box for the cancer bulb.
Those germicidal bulbs arent expensive indeed - i think the lamps are in the order of $15 each (for an 8 watt), and the ballast is the same as you use for normal fluorescents. The extra price for the bulbs compared to normal onces is due to the envelope being made out of quartz glass so that it passes UVC well - the output is around 250 nm.

We had them in hoods for microbiological work, on timers such that they would burn for an hour somewhere at night, killing any cells left in the hood. I never noticed bleaching of stuff left under them though, but since you were supposed to leave these hoods empty it didnt happen very often.
Benm is online now   Reply With Quote
Old 09-19-2010, 02:29 PM #7
Cyparagon's Avatar
Class 4 Laser
 
Join Date: Sep 2007
Location: Wisconsin
Posts: 9,141
Rep Power: 9321
Cyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond repute
Cyparagon Cyparagon is online now
Class 4 Laser
Cyparagon's Avatar
 
Join Date: Sep 2007
Location: Wisconsin
Posts: 9,141
Rep Power: 9321
Cyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond repute
Default Re: UV dye bleaching

They're just unfiltered low-pressure mercury lamps, so all mercury lines show through. The light appears to the eye as a light blue:

__________________
A problem well stated is a problem half solved.
Cyparagon is online now   Reply With Quote
Old 09-19-2010, 06:21 PM #8
Bionic-Badger's Avatar
Class 4 Laser
 
Join Date: Oct 2007
Location: Oregon, USA
Posts: 5,478
Rep Power: 1792
Bionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond repute
Bionic-Badger Bionic-Badger is online now
Class 4 Laser
Bionic-Badger's Avatar
 
Join Date: Oct 2007
Location: Oregon, USA
Posts: 5,478
Rep Power: 1792
Bionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond repute
Default Re: UV dye bleaching

Thanks for the advice guys! I've purchased a hanging fluorescent light and one of those germicidal bulbs. I'll see how it goes.
Bionic-Badger is online now   Reply With Quote
Old 09-19-2010, 10:16 PM #9
Benm's Avatar
Class 4 Laser
 
Join Date: Aug 2007
Location: Netherlands
Posts: 7,428
Rep Power: 15904
Benm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond repute
Benm Benm is online now
Class 4 Laser
Benm's Avatar
 
Join Date: Aug 2007
Location: Netherlands
Posts: 7,428
Rep Power: 15904
Benm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond repute
Default Re: UV dye bleaching

The light looks blue indeed - its the full mercury spectrum that comes out. The normal glass from those working hoods blocks most of it, though looking at it when on is still advised against.

What exactly are you trying to bleach?
Benm is online now   Reply With Quote
Old 09-19-2010, 10:42 PM #10
Bionic-Badger's Avatar
Class 4 Laser
 
Join Date: Oct 2007
Location: Oregon, USA
Posts: 5,478
Rep Power: 1792
Bionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond repute
Bionic-Badger Bionic-Badger is online now
Class 4 Laser
Bionic-Badger's Avatar
 
Join Date: Oct 2007
Location: Oregon, USA
Posts: 5,478
Rep Power: 1792
Bionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond repute
Default Re: UV dye bleaching

I'm seeing if I can bleach out the bayer filters in digital cameras. It'd essentially give me a black and white camera, but at full resolution via the RAW output, which is quite a bit sharper than the normal weighted black and white output.

I've read that others have tried it without success, but I don't know the conditions in which they were attempting it. If they were trying to bleach the filters through the front of the camera it may not have been very effective with all that glass and the IR/UV cut filters. I'll be testing it on some cheapie webcam with the lens removed, and then on a digital camera I have that I've removed the IR/UV cut filter from (exposing it to UV without a lens as well).
Bionic-Badger is online now   Reply With Quote
Old 09-20-2010, 01:37 AM #11
Benm's Avatar
Class 4 Laser
 
Join Date: Aug 2007
Location: Netherlands
Posts: 7,428
Rep Power: 15904
Benm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond repute
Benm Benm is online now
Class 4 Laser
Benm's Avatar
 
Join Date: Aug 2007
Location: Netherlands
Posts: 7,428
Rep Power: 15904
Benm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond repute
Default Re: UV dye bleaching

Oic.. so you put the whole sensor chip including its filter under UV light in an attemp to bleach out the filter pigments?

Its an interesting idea for sure, but somehow i doubt there is a level of exposure that will bleach out the filter but leave the sensor functional. I've never noticed degradation in the filters under normal use, even taking many photos under the desert sun - so i doubt the filters are very prone to photodegradation at all.
Benm is online now   Reply With Quote
Old 09-20-2010, 02:52 AM #12
Bionic-Badger's Avatar
Class 4 Laser
 
Join Date: Oct 2007
Location: Oregon, USA
Posts: 5,478
Rep Power: 1792
Bionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond repute
Bionic-Badger Bionic-Badger is online now
Class 4 Laser
Bionic-Badger's Avatar
 
Join Date: Oct 2007
Location: Oregon, USA
Posts: 5,478
Rep Power: 1792
Bionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond repute
Default Re: UV dye bleaching

I do think the silicon will hold up, but I don't know about any other plastics that could be on the sensor, especially on the webcam. While it is suggested not to expose the sensors to the sun because of color degradation, the main source of sensor damage is focused heat, not UV. I'll have to find a way to block out any heat from that bulb or other sources.

People have reported color degradation over time when filming sunsets with the "shutter" wide open; a "path" of color degradation would appear where the sun had passed over. I expect this was on a webcam that recorded the sky over longer periods. From this I have some hope that I'll be able to bleach the Bayer filter especially since webcams use plastic lenses instead of optical glass (opaque past 310nm), and are usually uncoated.

Still, that was the sun, focused, over hours a day, so I may have some time to spend bleaching this with the germicidal lamp. The germicidal lamp puts out UV-C, which is blocked by optical glass, and little UV-C makes it through the atmosphere. How those organic dyes might react to it I'm not sure. Worth a shot though.
Bionic-Badger is online now   Reply With Quote
Old 09-20-2010, 06:06 AM #13
Class 2M Laser
 
Join Date: May 2009
Posts: 955
Rep Power: 1542
LSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond repute
LSRFAQ LSRFAQ is offline
Class 2M Laser
 
Join Date: May 2009
Posts: 955
Rep Power: 1542
LSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond repute
Default Re: UV dye bleaching

Man, are you sure they are not dichroic coatings, but are really organic?

I would think what you are seeing is storing extra free electrons in the silicon. Very much like the stored charge in a ram or eeprom chip. It only takes about 400,000 electrons to saturate a pixel in many CCDs. Get some charge in the wrong place with the chip under bias and it might be there for a while.

If your trying to degrade a organic, you might wish to be in the 254 nm range. Or find a polymer testing lab with a "weatherometer" machine with the xenon long arcs.

Steve
LSRFAQ is offline   Reply With Quote
Old 09-20-2010, 12:19 PM #14
Benm's Avatar
Class 4 Laser
 
Join Date: Aug 2007
Location: Netherlands
Posts: 7,428
Rep Power: 15904
Benm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond repute
Benm Benm is online now
Class 4 Laser
Benm's Avatar
 
Join Date: Aug 2007
Location: Netherlands
Posts: 7,428
Rep Power: 15904
Benm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond repute
Default Re: UV dye bleaching

Quote:
Originally Posted by Bionic-Badger View Post
People have reported color degradation over time when filming sunsets with the "shutter" wide open; a "path" of color degradation would appear where the sun had passed over. I expect this was on a webcam that recorded the sky over longer periods.
I see.. never heard of this problem before, but it could be similar to burn in on a screen that displays the same image continoulsy (even some lcds are prone to that if its extreme).

It could be an entirely thermal thing though, taking photos of the sun directly is often advised against by manufacturers. You can take photos of the sunset, but taking one of the sun at noon in summer is quite likely to cause damage. I've seen many photos taken with cameras that suffered laser damage, even from exposure levels that don't exceed direct maximal sunlight.

As for the bayer filter: they use dyes. There is some development for dichroic filters as well as microlenses, but afaik none of those made it into budget cameras yet. I've heard of people physically scraping the filter off the sensor, though i doubt thats a very safe approach either
Benm is online now   Reply With Quote
Old 09-21-2010, 04:48 AM #15
Bionic-Badger's Avatar
Class 4 Laser
 
Join Date: Oct 2007
Location: Oregon, USA
Posts: 5,478
Rep Power: 1792
Bionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond repute
Bionic-Badger Bionic-Badger is online now
Class 4 Laser
Bionic-Badger's Avatar
 
Join Date: Oct 2007
Location: Oregon, USA
Posts: 5,478
Rep Power: 1792
Bionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond repute
Default Re: UV dye bleaching

I'm not sure what the mechanism was behind the color degradation people described in their cameras. I've blasted webcams with lasers and they definitely maintain a charge on the CCD that doesn't go away until reinitialized (no autoexposure settings, etc. fix it), but not a color degradation, and not in the path of the beam either. An extremely bright source usually blooms and bleeds into other columns, not leaving a distinct trail.

For scraping, I've seen the results of Bayer scraping on cheapo cameras, but am pretty reluctant to take a knife to the sensor of a more expensive camera, even if only because it may not work at all.

Some folk have used strong UV sources on the arrays, but they may have been attenuated by the glass or the filters inside, especially UV-C which won't even go through the glass. I bought a fluorescent lamp, and a germicidal bulb, so I should be able to produce UV-C in decent quantities. I also purchased a (backordered) high powered 365nm LED that I'll be trying out on it, to get some "pure" UV light sources, but the UV-C would probably be more effective.

I'll see how it goes. I've got all the parts ordered, and a candidate handheld digital camera to try it with once I've tested out the webcams.
Bionic-Badger is online now   Reply With Quote
Old 09-21-2010, 11:37 AM #16
Benm's Avatar
Class 4 Laser
 
Join Date: Aug 2007
Location: Netherlands
Posts: 7,428
Rep Power: 15904
Benm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond repute
Benm Benm is online now
Class 4 Laser
Benm's Avatar
 
Join Date: Aug 2007
Location: Netherlands
Posts: 7,428
Rep Power: 15904
Benm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond repute
Default Re: UV dye bleaching

Its just a matter of trial and error then - just let it bake under the germicidal bulb for a day and see if anything happens. If the light from that bulb wont bleach it out, nothing will.

Just be darn careful with that lamp though - its a proper cancer-ray alright
Benm is online now   Reply With Quote
Reply





Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On











Loading








Green Laser Pointers by Category Blue Laser Pointers by Category Red Laser Pointers by Category
Yellow Laser Pointers by Category Violet Laser Pointers by Category Orange Laser Pointers by Category
Top Laser Pointers by Power - 1 Watt+ Top Laser Pointers by Power - 500mW+ Top Laser Pointers by Power - 250mW+
Laser Pointer Database High Power Laser Pointers Laser Pointer Diodes






Privacy Policy | Advertising Disclaimer | Terms of Use


 


All times are GMT. The time now is 04:35 PM.


Powered by: vBulletin
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO
Privacy Policy | Advertising Disclaimer | Terms of Use
Copyright (C) 2017 Laser Pointer Forums, LLC