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Author Topic: Thermal Images - Can You Guess What These Are?  (Read 8342 times)
Jay Markanich
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« on: September 25, 2010, 07:48:45 PM »

I thought I would have some fun with the thermal camera and see what it sees.  I took two images of two different objects which appear to be exactly the same size but in fact are not.  In the thermal images they appear to be the same temperature, but in fact are not.

The image on the right was harder to get to come out the same size with the camera and in the same position in the image, and I tried!

The colors in the images look to be the same.  There is no temperature scale included because that would give things away.

Interestingly, the colors in the background look to be and are very similar in temperature.

You are intimately familiar with both of these things.

What do you think these two images are of?



The subscript under each picture might just give it away...
« Last Edit: September 25, 2010, 07:53:49 PM by Jay Markanich » Logged

Jay Markanich Real Estate Inspections, LLC
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David A. Andersen
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« Reply #1 on: September 25, 2010, 08:06:05 PM »

You didn't point your camera at the sun did you?!

Please, don't try this at home guys!
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David A. Andersen & Associates
Clarksville - Nashville Home Inspector Lic#40
http://www.midtninspections.com
ITC Certified Level II Thermographer Cert#1958
Building Science Thermographer Cert#33784
http://thermalimagingscan.com
HVAC Certification EPA Cert#2046620
Jay Markanich
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« Reply #2 on: September 26, 2010, 05:15:59 AM »

The instruction book says it is safe up to 1000F.  It's been working fine since.
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Jay Markanich Real Estate Inspections, LLC
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Festina Lente - Make Haste Slowly
David A. Andersen
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« Reply #3 on: September 26, 2010, 08:07:47 AM »

OK, but I have read several times, don't look at the sun. If nothing else it can wack your calibration.

I guess Al Gore's green house gases are protecting you! ;-)
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David A. Andersen & Associates
Clarksville - Nashville Home Inspector Lic#40
http://www.midtninspections.com
ITC Certified Level II Thermographer Cert#1958
Building Science Thermographer Cert#33784
http://thermalimagingscan.com
HVAC Certification EPA Cert#2046620
Jay Markanich
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« Reply #4 on: September 26, 2010, 04:29:55 PM »

You mean all that humidity in the air?  It was interesting Dave that the temps of the background only differed by a couple of degrees night to day.  I am going to do a sky shot in the winter and see if the backgrounds look so similar.  I also want to take an image of the moon in Dec or Jan and see if it is the same temp.

The sun the other day was 586.4F and the moon 108.1F.  I remembered you saying that in Indianapolis it was about 105 or so.  My moon may have been fuller and therefore warmer.
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Jay Markanich Real Estate Inspections, LLC
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Bill Warner
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« Reply #5 on: September 26, 2010, 05:12:41 PM »

The moon these last few nights has certainly been spectacular!
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Jay Markanich
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« Reply #6 on: September 26, 2010, 05:16:20 PM »

September's full moon is called the Full Corn Moon by the American Indians.  Next month is the Harvest Moon, but that is what American farmers call it.  The Indians, who named all the full moons, call next month's Hunter's Moon.  They counted on it to help lay up meat for the winter.

Or so I read...
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Jay Markanich Real Estate Inspections, LLC
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Carl Brown
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« Reply #7 on: September 26, 2010, 05:17:25 PM »

The moon these last few nights has certainly been spectacular!





last night it sure was
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David A. Andersen
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« Reply #8 on: September 27, 2010, 09:02:02 AM »

actually, 109 . I have seen it down to 107 due to high relative humidity air this summer. So, your right in the middle of things.

I have never tried the sun.
Some "professional thermography trainers" feel that adjusting for distance and atmospheric attenuation is totally unnecessary in this business.

I can assure you that the surface of the sun and the moon are just a little bit warmer than that and minor camera adjustments are necessary to correct for distance! :-)

maximum lunar surface temperature 253.4 F
minimum lunar surface temperature -451.4 F

The moon is 1,261,154,855.64 ft from earth.

Will JM's BCAM correct for that distance?

Actually guys, the only distance we need to concern ourselves with is the thickness of our atmosphere:
1,584,000 ft. thick but only 52,800 ft requires significant correction.

Jay, Can you correct for that distance and determining the emissivity of the lunar service which is less dense than Earth ?
my camera can only correct for distances up to 32,827.2 feet!

Thanks ! :-)
« Last Edit: September 27, 2010, 09:04:40 AM by David A. Andersen » Logged

David A. Andersen & Associates
Clarksville - Nashville Home Inspector Lic#40
http://www.midtninspections.com
ITC Certified Level II Thermographer Cert#1958
Building Science Thermographer Cert#33784
http://thermalimagingscan.com
HVAC Certification EPA Cert#2046620
Jay Markanich
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« Reply #9 on: September 27, 2010, 02:14:22 PM »

My camera is 7 years old and I have looked around the specs to see if I can adjust for that.  Don't think so...

Still, I'm wondering what temp the moon will bring in Dec or Jan!
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Jay Markanich Real Estate Inspections, LLC
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www.jaymarinspect.com
Festina Lente - Make Haste Slowly
Carl Brown
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« Reply #10 on: June 12, 2012, 07:43:17 PM »

and the rest of the story?
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