Essay On Infrared Thermography

Abstract- Infrared Thermography (IRT) can be demarcated as the discipline of acquisition and analysis of data from non-contact thermal imaging devices. The method of thermal imaging has simplified over the years with the availability of proficient, high resolution infrared cameras that convert the radiation sensed from the surfaces into thermal images. Thermography literally means 'writing with heat', just as photography implies 'writing with light'. The invisible infrared radiation emitted by bodies is converted into temperature and displayed as thermal images (thermographs). The recent progresses in Thermography and image processing have made the technique a valuable addition to the gamut of non-destructive testing methods. Thermography is

Infrared thermo graphic inspection steps are as follows:

1. To investigate situation of the retaining wall. Understanding the structural patterns and composing parts of the retaining wall; checking the surrounding environment, such as whether the wall is shaded by trees exist or not; selecting the suitable place to shoot, etc. Then we decide whether the infrared thermal imaging technology is adaptable or not.

2. To select the best testing time. There are hardly the same best testing time in different area and on different date, but the best testing time is among the several hours when the sun radiation is strongly. The shooting time may be selected according to weather forecast before testing. In fact, we can measure the temperature and radiant intensity firstly to know the climate while testing.

3. To process IR image. For the detection of a large retaking wall surface area, several IR images should be shot for different place of the wall’s surface due to the low-resolution of the IR detector. The images should be processed included geometric rectification and image registration and then the cutting and mosaic king of