The document explains thermography, a technique that uses infrared radiation to create thermal images, helping visualize temperature differences in various materials. It highlights the science behind thermography, its benefits, and the diverse applications ranging from building inspections to medical uses. Overall, thermal imaging offers a non-intrusive method to identify temperature anomalies, enhancing knowledge and insight into the conditions of various subjects.

1. Testo UK Ltd.
What is thermography?
2012 Testo UK Ltd.

2. Hello & Welcome
Ever wondered what Thermography is
and what it can be used for?
In this short presentation we
demonstrate the science behind the
technique and the areas in which this
technology will be beneficial.
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3. Discovery of infrared radiation
around 1800 by Friedrich
Wilhelm Herschel in England
Sir Friedrich Wilhelm Herschel
(* 15th November 1738 in
Hanover; † 25th August 1822 in
Slough) was a German-British
astronomer and musician.
Physicist Max Planck proved as far back as
1900, that there is a correlation between the
temperature of a “Body” and the Intensity of
the Infrared Radiation that it emits
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4. Thermal, or infrared energy, is light that is not visible
because its wavelength is too long to be detected by the
human eye; it's the part of the electromagnetic spectrum.
Unlike visible light, in the infrared world, everything
with a temperature above absolute zero emits heat.
Even very cold objects, like ice cubes, emit infrared.
The higher the object's temperature, the greater the
IR radiation emitted. Infrared allows us to see what
our eyes cannot.
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5. Thermal Imaging / Thermography is the
conversion of Infrared Radiation into Thermal
images.
A thermal image is an analogue pictorial
representation or visualisation of temperature
differences.
All objects above absolute zero (-273 degrees)
emit radiation, some of which is infra-red.
Depending on temperature and emissivity,
most objects in the world can be thermally
imaged.
Thermal imagers detect and record Infra-red
radiation emitted from the surface of any subject
being viewed. The imager does not have the ability
to see below the surface. However, the radiation
from the surface is often influenced by sub-surface
detail, which effects the thermal characteristics of
adjoining material(s).
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6. A special lens focuses The thermogram created by
the infrared light the detector elements is
emitted by all of the translated into electric
objects in view. impulses.
I FPA-Camera
(Focal Plane
The focused light is scanned
by a phased array of infrared-
Array) The impulses are sent to a signal-
detector elements. The processing unit, a circuit board
IR with a dedicated chip that
detector elements create a Optic
very detailed temperature translates the information from the
pattern called a thermogram. elements into data for the display.
2 dim.
It only takes about one-thirtieth Detector- The signal-processing unit
of a second for the detector Matrix sends the information to the
array to obtain the temperature display, where it appears as
information to make the various colours depending on
thermogram. the intensity of the infrared
emission.
This information is obtained from The combination of all the impulses
thousands of points in the field of from all of the elements creates the
view of the detector array. image.
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7. What are the benefits?
• Non-contact process / Non Intrusive
• Can safely see /visualise, temperatures of components, moving objects, thermal
patterns, very hot objects (Up to 2000°C) and high voltage objects
• Thermal Imaging gives us an overall temperature profile of the subject rather than
the temperature at one point
• A thermal image gives a visual indication of temperature differences and when it is
a Radiometric Thermal Image, it will also give temperature measurement.
65.6°C
60
50
40
31.7°C
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8. Where can thermal imagers be used?
• Building Fabric Investigations
• Electrical Equipment Surveys
• Mechanical Equipment Surveys
• Heating Systems & Pipe Location
• UPS Battery Systems
• Chilled Ceilings
• IT Cooling Systems
• System / Process Testing / Product Design
• Medical / Equine Veterinary
• And Many Many More
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9. Thermal Imaging provides a visualisation of temperature differentials which
can help to identify anomalies / faults. Thermal Imaging allows you to see
more.
To See More – Is to Know More
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10. info@testo.co.uk
www.testolimited.com
01420 544433
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