thermography | roc friese poort | erasmus plus
TRANSCRIPT
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Thermography
Old buildings, New Technologies
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Introduction
• Mr. Snippe• Physics teacher• Math teacher
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Index• Introduction of thermography
• How does a Thermal Imager work?
• Problems to be aware of
• Applications
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The Imager
FLIR E60bx
-320x240 pixels--20 to 120 °C
- Never touch the lens-Never aim at a spot warmer than 250 °C
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Why thermography
• In physical processes heat is always an important factor.
• Sometimes cause, often the result of a process
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What is Thermography
Thermography• makes temperature visible• translates temperature into
colours• gives a completely different
view of the environment
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Examples
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Spectrum• People can see visible light• People can’t see temperature
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Elektromagnetic radiation• Every object emits elektromagnetic radiation
caused by its temperature• Sometimes this can be felt, but it can not be seen
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Thermographic imaging
• A thermographic camera receives infra-red radiation and translates this into visible light.
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Information on the screen
• Spot measuring
• Temperature scale/scope(automatic or set by hand)
• Emissionfactor – Paint = 0,95 – Aluminium = 0,05
• Reflected temperature
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Setting the emission factor • One half aluminium
• Other half black paint
• Black part = 0.95Ɛ• Aluminium part = 0,07Ɛ
if the emission factor is not set correctly,the measured temperature is false!!
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Reflection in a window
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Reflections in other objects
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Setting the emission factor
• A surface that does not reflect has = 1Ɛ• A surface that only reflects has = 0Ɛ
The more reflection there is, the more
unreliable the temperature image will be
Trick: Insulation tape has = 0,95Ɛ
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Points of attention
• If you do not set the parameters correctly, the imager will not give you the correct results
• Always be aware of thermal reflections
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Important• You just see differences in temperature
• Often the temperature difference is an effect from a cause
• Thermography is very useful for a quickscan of problem areas, further research is always necessary
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Range of applications
• Making heat transmission visible• Checking wether insulation is effective• Searching for draught, especially in
combination with a blower door test• Searching for leakages• Checking of solar panels
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Heat transmission
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Checking of insulation
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Searching draught spots
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Blower door test
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Leakages on a flat roof
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Checking solar panels
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Thermography
Old Buildings, New Technologies