From kd7jyk at earthlink.net Wed Dec 17 00:11:10 2014 From: kd7jyk at earthlink.net (KD7JYK DM09) Date: Tue, 16 Dec 2014 21:11:10 -0800 Subject: [Laser] Off the wall thought... References: <001901cf2aa4$5fe26770$1fa73650$@alum.mit.edu><201402170859.s1H8xifY029502@c.mail.sonic.net> <3F35EC2B-5B18-46EE-9D44-12D9EFDF7F9B@oh.rr.com><023801cfac8e$dbbbdf90$0954fb48@mainframe> <53DD73B4.4060209@RighTime.com> Message-ID: <00fc01d019b7$e86c36e0$0754fb48@mainframe> Is there a filter material, something along the lines of thin glass or plastic, that can convert IR into the visible spectrum? For example, hold up a filter in front of an IR LED remote control and see the pulses of light? More importantly, would such a thing be fairly inexpensive? Kut From crpattoniii at gmail.com Wed Dec 17 00:49:44 2014 From: crpattoniii at gmail.com (Charles R. Patton) Date: Tue, 16 Dec 2014 21:49:44 -0800 Subject: [Laser] Off the wall thought... In-Reply-To: <00fc01d019b7$e86c36e0$0754fb48@mainframe> References: <001901cf2aa4$5fe26770$1fa73650$@alum.mit.edu><201402170859.s1H8xifY029502@c.mail.sonic.net> <3F35EC2B-5B18-46EE-9D44-12D9EFDF7F9B@oh.rr.com><023801cfac8e$dbbbdf90$0954fb48@mainframe> <53DD73B4.4060209@RighTime.com> <00fc01d019b7$e86c36e0$0754fb48@mainframe> Message-ID: <54911978.40209@ieee.org> Thoughts: 1) Years ago, Kodak had a plastic film coated with a material that could be "charged" with visible light. Then when IR light was shined on it, it would glow in the visible region. I don't know how fast the response was, but I'm sure it was fast, just not necessarily sensitive. 2) There were plates coated with a thermal barrier coating and then a fluorescing powder. A UV light would then be used to light them up. When hit by IR, the powder coating would heat up, and the powder would go dark. The thermal barrier was varied so that it took different amounts of power to cause them to darken. These were slow response, but very useful for tuning up CO2 lasers I built. Chas K6PIP wThe On 12/16/2014 9:11 PM, KD7JYK DM09 wrote: > Is there a filter material, something along the lines of thin glass or > plastic, that can convert IR into the visible spectrum? For example, hold > up a filter in front of an IR LED remote control and see the pulses of > light? More importantly, would such a thing be fairly inexpensive? > > Kut > > ______________________________________________________________ > Laser mailing list > Home: http://mailman.qth.net/mailman/listinfo/laser > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Laser at mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html From kd7jyk at earthlink.net Wed Dec 17 01:12:23 2014 From: kd7jyk at earthlink.net (KD7JYK DM09) Date: Tue, 16 Dec 2014 22:12:23 -0800 Subject: [Laser] Off the wall thought... References: <001901cf2aa4$5fe26770$1fa73650$@alum.mit.edu><201402170859.s1H8xifY029502@c.mail.sonic.net> <3F35EC2B-5B18-46EE-9D44-12D9EFDF7F9B@oh.rr.com><023801cfac8e$dbbbdf90$0954fb48@mainframe> <53DD73B4.4060209@RighTime.com><00fc01d019b7$e86c36e0$0754fb48@mainframe> <54911978.40209@ieee.org> Message-ID: <000701d019c0$8b5c4680$0754fb48@mainframe> I have some of the materials you "charge" that will react to IR, radio shack used to sell "IR Remote Testers", a card with a patch of material on it that you'd hold to a light source, then shine your remote on it and it would flash a bright blue/green/white reacting to IR at close range. I was thinking along the lines of something you could look through, like a lens in a pair glasses. Kurt From sjnoll at ix.netcom.com Wed Dec 17 02:05:45 2014 From: sjnoll at ix.netcom.com (Steve J. Noll) Date: Tue, 16 Dec 2014 23:05:45 -0800 Subject: [Laser] Off the wall thought... In-Reply-To: <00fc01d019b7$e86c36e0$0754fb48@mainframe> References: <001901cf2aa4$5fe26770$1fa73650$@alum.mit.edu><201402170859.s1H8xifY029502@c.mail.sonic.net> <3F35EC2B-5B18-46EE-9D44-12D9EFDF7F9B@oh.rr.com><023801cfac8e$dbbbdf90$0954fb48@mainframe> <53DD73B4.4060209@RighTime.com> <00fc01d019b7$e86c36e0$0754fb48@mainframe> Message-ID: <54912B49.1090306@ix.netcom.com> I picked up a 'toy' IR viewer on eBay, a "Spy Gear Ultimate Infrared Night Vision Goggle" that works incredibly well. Easily sees flashing IR remotes, and sees 'in the dark' quite well. Coupled with a set of IR longpass filters from eBay "55mm Infrared Infra-Red Filter Kit: 720+760+850+950 nm" you can home in on what wavelength you're seeing. But, if you're just trying to characterize the pulses, a cheap silicon photodiode and oscilloscope would be better. The IR viewer cards don't respond fast enough to discern individual pulses, and they're not terribly sensitive. A cheap Radio Shack type card worked better than a more expensive one I bought from Thor Labs. When I complained to Thor they sent me another which worked just as poorly! *Steve WA6EJO http://www.qrz.com/db/WA6EJO *On 12/16/2014 9:11 PM, KD7JYK DM09 wrote: > Is there a filter material, something along the lines of thin glass or > plastic, that can convert IR into the visible spectrum? For example, hold > up a filter in front of an IR LED remote control and see the pulses of > light? More importantly, would such a thing be fairly inexpensive? > > Kut > > ______________________________________________________________ > Laser mailing list > Home: http://mailman.qth.net/mailman/listinfo/laser > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Laser at mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > From kd7jyk at earthlink.net Thu Dec 18 20:15:31 2014 From: kd7jyk at earthlink.net (KD7JYK DM09) Date: Thu, 18 Dec 2014 17:15:31 -0800 Subject: [Laser] Off the wall thought... References: <001901cf2aa4$5fe26770$1fa73650$@alum.mit.edu><201402170859.s1H8xifY029502@c.mail.sonic.net> <3F35EC2B-5B18-46EE-9D44-12D9EFDF7F9B@oh.rr.com><023801cfac8e$dbbbdf90$0954fb48@mainframe> <53DD73B4.4060209@RighTime.com><00fc01d019b7$e86c36e0$0754fb48@mainframe> <54912B49.1090306@ix.netcom.com> Message-ID: <02b001d01b2c$118a9470$5755fb48@mainframe> : But, if you're just trying to characterize the pulses, a cheap silicon : photodiode and oscilloscope would be better. No, just trying to find goggles I can pop on and see IR. I read the following article, thought there has to be a MUCH simpler way: www.world-science.net/othernews/141201_infrared.htm There must be a piece of glass or plastic that can upshift light... Kurt From sjnoll at ix.netcom.com Thu Dec 18 22:07:15 2014 From: sjnoll at ix.netcom.com (Steve J. Noll) Date: Thu, 18 Dec 2014 19:07:15 -0800 Subject: [Laser] Off the wall thought... In-Reply-To: <02b001d01b2c$118a9470$5755fb48@mainframe> References: <001901cf2aa4$5fe26770$1fa73650$@alum.mit.edu><201402170859.s1H8xifY029502@c.mail.sonic.net> <3F35EC2B-5B18-46EE-9D44-12D9EFDF7F9B@oh.rr.com><023801cfac8e$dbbbdf90$0954fb48@mainframe> <53DD73B4.4060209@RighTime.com><00fc01d019b7$e86c36e0$0754fb48@mainframe> <54912B49.1090306@ix.netcom.com> <02b001d01b2c$118a9470$5755fb48@mainframe> Message-ID: <54939663.8030608@ix.netcom.com> I know what you're saying. There are crystals that double IR to make visible, but I think quite high power IR is needed. That's an interesting article. I have been able to see a 940 nm LED in a Wave radio remote, but my eye had to be dark-adjusted for several hours to do that. Steve WA6EJO On 12/18/2014 5:15 PM, KD7JYK DM09 wrote: > : But, if you're just trying to characterize the pulses, a cheap silicon > : photodiode and oscilloscope would be better. > > No, just trying to find goggles I can pop on and see IR. I read the > following article, thought there has to be a MUCH simpler way: > > www.world-science.net/othernews/141201_infrared.htm > > There must be a piece of glass or plastic that can upshift light... > > Kurt > > ______________________________________________________________ > Laser mailing list > Home: http://mailman.qth.net/mailman/listinfo/laser > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Laser at mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > From kd7jyk at earthlink.net Thu Dec 18 23:07:08 2014 From: kd7jyk at earthlink.net (KD7JYK DM09) Date: Thu, 18 Dec 2014 20:07:08 -0800 Subject: [Laser] Off the wall thought... References: <001901cf2aa4$5fe26770$1fa73650$@alum.mit.edu><201402170859.s1H8xifY029502@c.mail.sonic.net> <3F35EC2B-5B18-46EE-9D44-12D9EFDF7F9B@oh.rr.com><023801cfac8e$dbbbdf90$0954fb48@mainframe> <53DD73B4.4060209@RighTime.com><00fc01d019b7$e86c36e0$0754fb48@mainframe> <54912B49.1090306@ix.netcom.com><02b001d01b2c$118a9470$5755fb48@mainframe> <54939663.8030608@ix.netcom.com> Message-ID: <00d801d01b44$6b0c5200$6955fb48@mainframe> : That's an interesting article. I have been able to see a 940 nm LED in a : Wave radio remote, but my eye had to be dark-adjusted for several hours : to do that. I see the IR used for security cameras all the time, even in some illuminated areas, not sure what the wavelength is, I was told IR, but, relatively short to save on lens cost. I see a few remotes and some of the Ramsey IR kits, but they have different looking LEDs depending on when you bought them so some I can't see, too long a wavelength. Kurt From GTBecker at RighTime.com Fri Dec 19 10:50:36 2014 From: GTBecker at RighTime.com (Tom Becker) Date: Fri, 19 Dec 2014 10:50:36 -0500 Subject: [Laser] Off the wall thought... In-Reply-To: <02b001d01b2c$118a9470$5755fb48@mainframe> References: <001901cf2aa4$5fe26770$1fa73650$@alum.mit.edu><201402170859.s1H8xifY029502@c.mail.sonic.net> <3F35EC2B-5B18-46EE-9D44-12D9EFDF7F9B@oh.rr.com><023801cfac8e$dbbbdf90$0954fb48@mainframe> <53DD73B4.4060209@RighTime.com><00fc01d019b7$e86c36e0$0754fb48@mainframe> <54912B49.1090306@ix.netcom.com> <02b001d01b2c$118a9470$5755fb48@mainframe> Message-ID: <5494494C.4020806@RighTime.com> If you are looking to translate short-IR, like ~900nm, this won't help, but if you are looking for longwave IR, like 10000nm, here you go; Sparkfun just announced a $350 FLIR sensor: https://www.sparkfun.com/products/13233?utm_source=SparkFun+Customer+Newsletter&utm_campaign=245b064040-RegCustomerNews12%2F19&utm_medium=email&utm_term=0_fa5287abaf-245b064040-61263073 Tom From GTBecker at RighTime.com Fri Dec 19 12:46:38 2014 From: GTBecker at RighTime.com (Tom Becker) Date: Fri, 19 Dec 2014 12:46:38 -0500 Subject: [Laser] Off the wall thought... In-Reply-To: <54939663.8030608@ix.netcom.com> References: <001901cf2aa4$5fe26770$1fa73650$@alum.mit.edu><201402170859.s1H8xifY029502@c.mail.sonic.net> <3F35EC2B-5B18-46EE-9D44-12D9EFDF7F9B@oh.rr.com><023801cfac8e$dbbbdf90$0954fb48@mainframe> <53DD73B4.4060209@RighTime.com><00fc01d019b7$e86c36e0$0754fb48@mainframe> <54912B49.1090306@ix.netcom.com> <02b001d01b2c$118a9470$5755fb48@mainframe> <54939663.8030608@ix.netcom.com> Message-ID: <5494647E.7030504@RighTime.com> > ... goggles I can pop on and see IR... Actually, all you need is a small video camera whose sensor allows its IR-block filter to be removed, and a wearable monitor to mount the camera on. Silicon sensors see short IR very well, albeit in monochrome. A color translation would be much more difficult, I suspect. Tom From wchast at gmail.com Fri Dec 19 13:22:23 2014 From: wchast at gmail.com (Chuck Hast) Date: Fri, 19 Dec 2014 10:22:23 -0800 Subject: [Laser] Off the wall thought... In-Reply-To: <5494647E.7030504@RighTime.com> References: <001901cf2aa4$5fe26770$1fa73650$@alum.mit.edu> <201402170859.s1H8xifY029502@c.mail.sonic.net> <3F35EC2B-5B18-46EE-9D44-12D9EFDF7F9B@oh.rr.com> <023801cfac8e$dbbbdf90$0954fb48@mainframe> <53DD73B4.4060209@RighTime.com> <00fc01d019b7$e86c36e0$0754fb48@mainframe> <54912B49.1090306@ix.netcom.com> <02b001d01b2c$118a9470$5755fb48@mainframe> <54939663.8030608@ix.netcom.com> <5494647E.7030504@RighTime.com> Message-ID: I just take the IR filter off of a web cam and now you have great little short IR viewer, and yes some false color mapping would be great. I use those little cameras to look at IR lasers, keeps the laser goo out of my eyes... On Fri, Dec 19, 2014 at 9:46 AM, Tom Becker wrote: > > ... goggles I can pop on and see IR... >> > > Actually, all you need is a small video camera whose sensor allows its > IR-block filter to be removed, and a wearable monitor to mount the camera > on. > > Silicon sensors see short IR very well, albeit in monochrome. A color > translation would be much more difficult, I suspect. > > > Tom > > > > ______________________________________________________________ > Laser mailing list > Home: http://mailman.qth.net/mailman/listinfo/laser > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Laser at mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > -- Chuck Hast -- KP4DJT -- Glass, five thousand years of history and getting better. The only container material that the USDA gives blanket approval on.