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THERMOGRAPHY

Presented by,
ARYA.S.VIJAYAN
Rollno:14
INTRODUCTION
INFRARED THERMOGRAPHY IS THE TECHNIQUE THAT USES AN INFRARED IMAGING AND MEASUREMENT CAMERA TO SEE AND MEASURE INVISIBLE INFRARED ENERGY BEING EMITTED FROM AN OBJECT.


What is Infrared
All matter (gases, planets, etc) emits some amount of electromagnetic radiation across a range of energies (or wavelengths).
Infrared refers to the portion of the electromagnetic spectrum where biological life-forms emit the most light, at wavelengths slightly longer than what we perceive as the color red.


Why Donâ„¢t We See It
Put simply, our eyes do not have the elements necessary for detecting infrared. While there are practical evolutionary reasons for this, infrared is a reality that exists behind the scenes.


Everyday Infrared

We may not be able to see infrared, but we can still sense it through what is commonly called heat. Physical touch is the most direct way of observing it. You sense it on a hot day under the sun, or when someone walks between you and a campfire.

Some properties of the ThermaCAM B1:

Thermal Sensitivity: 0.12°C
Min/Max Auto Adjust: Continuous or Manual
Range: -20 to 50°C (-4 to 155°F)
Spectral Range: 7.5 - 13 m
Lens: standard 24° or wide angle 45°


Difference between infrared film and thermography
IR film is sensitive to infrared (IR) radiation in the 250°C to 500°C range, while the range of thermography is approximately -50°C to over 2,000°C. So, for an IR film to show something, it must be over 250°C or be reflecting infrared radiation from something that is at least that hot. Night vision infrared devices image in the near-infrared, just beyond the visual spectrum, and can see emitted or reflected near-infrared in complete visual darkness. Starlight-type night vision devices generally only magnify ambient light.


Additional Features:
Video Output: NTSC/Standard RCA
Available Palettes: Iron, High Contrast Rainbow, B/W, B/W inverted
On board 1mW 635nm laser enables long-range precision temperature measurements.


What will the camera see
These raw images were captured with an infrared
camera stationed on the fourth floor. Notice the
heat signatures on cafeteria seats after the students have left. Using our projection system, those areas would remain lit until the heat dissipates; if you were to leave your seat to get a drink, you would come back to find your own heat signature, still lit.


USES OF THERMOGRAPHY
air port staff using the technology to detect suspected swine flu cases.
fire fighters use it to see through smoke, find persons, and localize the base of fire.
thermal imaging cameras are installed in some luxury cars to aid the driver, the first being the 2000 Cadillac De Ville.


Advantages of thermography
It shows a visual picture so temperatures over a large area can be compared
It is capable of catching moving target in real time
It is able to find deteriorating
It can be used to find defects in shafts, pipes, and other metal or plastic parts
It can be used better in dark areas


DISADVANTAGES OF THERMOGRAPHY
Due to the low volume thermal cameras, quality cameras often have a high price range
Images can be difficult to interpret accurately
Accurate temperatures measurements are hindered by differing emissivities and reflections from other surfaces
Only able to directly detect surface temperature


CONCLUSION
The spectrum and amount of thermal radiation depend strongly on an objectâ„¢s surfaces temperature this makes it possible for a thermal camera to display an objectâ„¢s temperature