LED Lights That Can Be Seen by a Thermal Imager?

LED lights that can be seen by a Thermal Imager?

PostBy: EarthWindandFire On: Tue Feb 07, 2017 11:47 am

I have a mixed science background, but I'm stumped on this one.

For a school project, my son is looking for LED lights that can be seen by a thermal imager. But, they must look to the person using the thermal imager like an extremely bright light, almost like a flashlight in intensity.

Any suggestions or thoughts?
EarthWindandFire
 
Hot Air Coal Stoker Furnace: Leisure Line Lil' Heater.
Other Heating: Oil Furnace and Kerosene Heaters.


Re: LED lights that can be seen by a Thermal Imager?

PostBy: lsayre On: Tue Feb 07, 2017 12:11 pm

As a rule, LED bulbs are cool, so they would not present a very bright thermal image. Their bases get hot though.
lsayre
 
Stoker Coal Boiler: AHS S130 Coal Gun
Coal Size/Type: Blaschak Anthracite Pea
Other Heating: Resistance Boiler (13.5 KW)

Re: LED lights that can be seen by a Thermal Imager?

PostBy: EarthWindandFire On: Tue Feb 07, 2017 2:46 pm

Thanks Larry!

They do make IR LED's that emit only infrared light. But, I'm not sure that's the best method for this attempted application.

What wavelength of light could be seen best by a Thermal Imager during a fire, for example?
EarthWindandFire
 
Hot Air Coal Stoker Furnace: Leisure Line Lil' Heater.
Other Heating: Oil Furnace and Kerosene Heaters.

Re: LED lights that can be seen by a Thermal Imager?

PostBy: lsayre On: Tue Feb 07, 2017 3:27 pm

Not sure. Something with a low 'effective' temperature and thereby a long wavelength would be my guess. IR fits that bill.
lsayre
 
Stoker Coal Boiler: AHS S130 Coal Gun
Coal Size/Type: Blaschak Anthracite Pea
Other Heating: Resistance Boiler (13.5 KW)

Re: LED lights that can be seen by a Thermal Imager?

PostBy: titleist1 On: Tue Feb 07, 2017 3:42 pm

I've got some LED's and I have a thermal imager so I can try imaging a few tonight and see what it looks like. The flashlights that I have are LED too so I'm not sure comparing the LED to my flashlight helps?
titleist1
 
Hot Air Coal Stoker Stove: Harman Mag Stoker (old style) one in basement, one in workshop
Hand Fed Coal Stove: Harman Mark III on standby for long power outages
Coal Size/Type: Rice/Anthracite; Nut/Anthracite

Re: LED lights that can be seen by a Thermal Imager?

PostBy: Black_And_Blue On: Tue Feb 07, 2017 6:06 pm

Hmmm, I know infrared LED can be seen with a cell phone camera but I think you are asking the other way round.....
Black_And_Blue
 
Hot Air Coal Stoker Stove: Alaska 140

Re: LED lights that can be seen by a Thermal Imager?

PostBy: titleist1 On: Tue Feb 07, 2017 10:16 pm

I found a standard bulb flashlight and set it next to the LEDs I have then took a thermal image. The 10mm, 12V "very bright" LED's barely registered on the image, didn't matter which color LED. I tried red, purple, blue and green. An example is below...The flashlight is on the right and the barely seen blip on the left sitting on the battery is the LED.

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From a spool of flexible led strip I have 6 green LED's in the next picture. These show up better. The flashlight is on right and the LED strip is on the left. I suspect it is the components on the strip giving off heat that the imager is picking up rather than the LED's themselves.

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titleist1
 
Hot Air Coal Stoker Stove: Harman Mag Stoker (old style) one in basement, one in workshop
Hand Fed Coal Stove: Harman Mark III on standby for long power outages
Coal Size/Type: Rice/Anthracite; Nut/Anthracite