Thermography

Infra red Thermography

INTRODUCTION

• Infrared Thermography is a proactive troubleshooting and predictive maintenance tool.

• An infrared camera can be used to make the world

that is invisible to the human eye come to life.

Example

Normal and Thermoscopic image

Working

* All materials, which are above 0 degrees Kelvin (-273 degrees C), emit infrared energy.

* Thermal, or infrared energy, is light that is not visible because its wavelength is too long to be detected by the human eye;

• The infrared energy emitted from the measured object is converted into an electrical signal by the imaging sensor (microbolometer) in the camera and displayed on a monitor as a colour or monochrome thermal image.

Working

•The spectrum and amount of thermal radiation depend strongly on an object's surface temperature. This makes it possible for a thermal imaging camera to display an object's temperature.

Working

Working

In other words,

The higher the temperature, the greater the intensity of infrared energy that is emitted. As well as emitting infrared energy, materials also reflect infrared, absorb infrared and,in some cases, transmit infrared.

• As long as there is a heat or cold difference between an object under investigation and other objects in the environment, ATI will get the image.

Applications

1. Electronic Field

2. Fire accidents

3. Medical Field

4. Building Surveys

In Electronic field

In Electronic field it is usually used to detect loose connections and failure cases

In Medical

•In medical field it has wide applications ..mainly to detect cancer affected cells in human body .

•In recent days to detect diseases like swine flue

Fire applications

•In fire accidents ….the fire men will find difficult to locate the persons who has struck in the accidents

using this they find it easy .Because the temperature of body differs from radiation of surroundings

Building Surveys

Here it is mainly used to determine building flaws. And any unknown damaged areas during construction

Advantages

• It is capable of catching moving targets in real time

• It is able to find deteriorating, i.e., higher temperature components prior to their failure

• It can be used to find defects in shafts, pipes, and other metal or plastic parts

• It can be used to detect objects in dark areas

Disadvantages

• Quality cameras often have a high price range (often US$6,000 or more)

• Images can be difficult to interpret accurately when based upon certain objects, specifically objects with erratic temperatures, although this problem is reduced in active thermal imaging

• Most cameras have ±2% accuracy or worse in measurement of temperature and are not as accurate as contact methods 

• Only able to directly detect surface temperatures

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kavi