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November 2011 | Volume 12, Issue 11  
welcome
gary

Hello,

We are at InfraMation as I write this. We have four sessions running today, Research and Science, Optical Gas Imaging, Level II Certification, and Level I Building Investigations tracks. 

Ever wonder what to do with cavities? I am talking about the kind that helps you as an IR thermographer, not the kind your dentist warns you about. Bernie Lyon has some explanation and tips for you. 

We are also introducing the FACT Certification, or FLIR Authorized Camera Technician. Check the links below to learn about it and how you can get one.

I gotta run to my next InfraMation session, so have a great Turkey Day and we will see you next month.

As with all images in this newsletter, click an image to see a larger version.

Until next month,

Gary Orlove
Editor and Publisher

 

itc message board

Here is a selection of recent new threads by IR Community members. Feel free to click the links, see the responses, and post your own response if you like.

IR for snowy condition
I want to know what to do or how do you set the parameters, if you had to take and measure something with IR camera in snowy condition. 
http://www.infraredtraining.com/
community/boards/thread/10950/

Thermal Index & Efficiency of Walls and Windows 
My IR camera has a user input value for "Thermal Index" in %. I believe this represents to the efficiency of the exterior wall that you are inspecting for insulation problems (heat loss). So let’s say, I am inspecting an exterior wall and I have set the value for thermal index of 80%, so the camera will be checking for the presence of 80% efficiency on the wall area? Is that what it means? I can’t seem to find any info on this function and this is what I figured it means. P.S Besides thermal index, I also need to enter the value for inside/outside temp along with RH value.
Also, does anyone know what should be the efficiency (in %) for exterior wall and windows in extreme cold conditions? e.g. is it 80% for walls and 20% for windows etc.? 
http://www.infraredtraining.com/
community/boards/thread/11017/

Is this a roof leak? 
I recently did an inspection of a 8 year old house. This was in the bathroom that had just been used for shower. There was very light rain for the past 6-7 hours. Does this look like a roof leak? I am not too sure because they appear only where those nail heads are showing. When I put up the moisture meter, it read +40% on those areas and also on the area around those two spots where there does not seem to have any problems. Humidity: 60% 
http://www.infraredtraining.com/
community/boards/thread/11030/

TPO Roof Moisture Survey 
Has anyone had any experience performing infrared moisture surveys on white TPO membrane roof systems? Are there better times to scan i.e. early evenings, late evenings to get the best thermo images? 
http://www.infraredtraining.com/
community/boards/thread/11038/

Molten Glass transmission? 
I am trying to measure the temperature of molten glass bottle which is called gob. Assume is soda lime glass has anyone has information above the transmission of the glass as a function of temperature? I know the thickness has a direct effect on the transmission but how about the temperature?
http://www.infraredtraining.com/
community/boards/thread/11058/

And of course if YOU have a question or want to start a discussion on a topic, we would love to hear from you. Just start a new thread on a message board.


brainteaser

November - brainteaser

Here is this month's brainteaser. Readers who e-mail us a correct explanation are entered into a drawing to win a prize. Please put "Brainteaser" as the subject of the message. E-mail your guess to gary.orlove@infraredtraining.org.

Do you have an interesting image that you think would challenge other thermographers? If so please email me your image (preferably in native .img, .jpg, or .tif format) with an accompanying visible photo and explanation at gary.orlove@infraredtraining.com. If your image is used, you receive a gift as well.

feature

Using Cavities to Solve Emissivity Problems, Here's the Drill

By Bernie Lyon

Here are two illustrations that I have created to demonstrate how the cavity effect works.

Referring to Figure 1, the “ideal” block has an emissivity of 0.2 and a reflectivity of 0.8 We are assuming that these values are constant and do not change with angle. This is not the case. If thermal radiation strikes a single surface, 20% of the radiation is absorbed and 80% is reflected. (Keep in mind 20% of the radiation – Not the temperature!) If it strikes another surface before exiting, 20% of what remains is absorbed and 80% of that is reflected, and so on…

Read the entire article

Video of the month

November - video

Adaptive Camouflage

This video shows the ADAPTIV, an adaptive thermal signature management developed in Sweden. The video shows clips form a recent test, demonstrating how the 'invisibility cloak' on the CV90 light tank turns the vehicle invisible, by blend into its surroundings. Other parts of the video show how the same system can be used to display different images, including text, disguise as smaller or different vehicles.http://youtu.be/wlLqdFsMnCE

ir news

Straight from the World Wide Web, here is what's going on in the world of infrared thermography.

August  - news1  Thermal imaging for fun, insight and experiment
Thermalcities.com looks at the world of thermal imagery on behalf of ordinary people. Set up originally to show how London looked through the lens of a thermal ...
http://www.seedgen.com/thermallondon/
Nov - news 2

Infrared Home Survey
Tyler Lee just bought a home in the Plaza-Midwood neighborhood. Before he moves in, he's getting an infrared survey of the house to find out where air is leaking.
http://www.foxcharlotte.com/news/top-stories/Infrared-Survey-131326419.html

Aug - news 3 FLIR Authorized Camera Technician Certificate
Know how to use your IR camera? Want everyone to know it? Take a FLIR Authorized Camera Technician test and earn an official FACT Certificate to verify your expertise no matter what type of IR imager you own. FACT exams are currently offered at all of our Level I class locations as well as at our annual InfraMation Conference. Best of all, they’re free!....
http://irinformir.blogspot.com/2011/11/flir-authorized-camera-technician.html

follow us

October - brainteaser November - brainteaser

Last month’s brainteaser is…………a pine wood chip pile! The top layer is hotter than the rest as it has been freshly debarked and chipped up, making it hotter than the rest of the pile. 

Did you guess correctly? We had 16 responses and only one correct guess. Congratulations to our winner Joe Neal and our thermogram contributor, Randy Eddins! They both receive the coveted ITC low e coffee mug.

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