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Blog #012 – Your THERMOGRAPHY COMFORT LEVEL – Equilibrium is your enemy.

South Wall 7:00 am after cool night

South Wall 7:00 am after cool nightSouth Wall 10:00 am (equilibrium)South Wall 2:00pm

South Wall 10:00am (equilibrium)

South Wall 10:00am (equilibrium)

South Wall 2:00pm

South Wall 2:00pm

The purpose in using a thermal imaging camera in this instance is to identify the unfilled cinder blocks.  The principle is thermal capacitance.  I used my Fluke IR camera at 7am, 10am and 2pm.  This is a south wall and at 7am there is no solar influence.  At 10am you can see the shadows from a tree along with the effect of solar influence.  And at 2 pm we have full solar impact.  What if you had inspected this wall only one time, at 10am?  What would have been your conclusion?  Since air has a lower thermal capacitance than filled cinder block the unfilled blocks with change temperature faster.  After a cool night in Sacramento the unfilled blocks are cooler than the filled blocks.  By 10 am they have reached equilibrium.  By 2 pm the temperature of the unfilled blocks have risen above the filled blocks, all due to the principle of thermal capacitance.  An important lesson in this experience is to realize that equilibrium will be reached twice in a 24 hour period.  For this type of investigation you will do better with a more sensitive detector system, a 70mK or 50mK detector.  The Fluke TiR1 has a 70mK detector array and the Fluke TiR32 or Ti32 has a 50mK detector array.  These images were taken with the 70mK detector.

How’s your comfort level in thermography?
(The above comments represent my opinion).

Rod Hoff / Restoration Consultants Inc
Thermography Instructor / IR camera sales
3284 Ramos Circle, Sacramento CA 95827
toll free 888-617-3266 ext 301
fax 916-736-1134
rhoff@restcon.com

Provider of Fluke TiS, TiR, TiR1, Ti, Ti25, TiR27, Ti27, TiR29, Ti29, TiR32, Ti32, TiR3, and TiR4 infrared cameras.

See DEMO www.moistureview.com/demo.html

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About infrarod

Rod Hoff is a Thermographer and instructor with Restoration Consultants, Inc. He teaches a two-day IR class in moisture and building envelope investigations. A graduate from Florida State University, with a degree in education, he received his formal training in Thermography from Snell Infrared and Restoration Consultants, Inc.
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