What is flash thermography?

Optical flash thermography, where the sample surface is heated by a brief pulse of light, has emerged as the most widely implemented technique in the United States, as it is faster than step or modulated optical heating, and it facilitates quantitative measurement of thickness, depth or thermal diffusivity.

What does infrared thermography detect?

Infrared thermography is the process of using a thermal imager to detect radiation (heat) coming from an object, converting it to temperature and displaying an image of the temperature distribution.

What are two main types of infrared thermography?

There are two basic types of thermography; passive thermography and active thermography.

What are the disadvantages of infrared thermography?

Disadvantages. The technique does have certain drawbacks. To interpret the results requires a certain experience and knowledge. Obtaining high accuracy can be difficult due to varying emissivity of the different materials; reflections from other surfaces; and other characteristics.

What is thermography NDT?

Thermography is a non-destructive testing method used to detect and measure small temperature differences to help find deterioration in assets and plant sites. Thermography can support the maintenance of industrial plants and equipment with its fast and cost-effective application.

How do you read a thermography image?

In any thermogram, the brighter colors (red, orange, and yellow) indicate warmer temperatures (more heat and infrared radiation emitted) while the purples and dark blue/black indicate cooler temperatures (less heat and infrared radiation emitted). In this image, the bright yellow area indicates the electrical fault.

How do you use a thermograph?

Continuous thermograph records were made inside a standard weather house located on the floor of the greenhouse. Temperature in the non-temperature-controlled greenhouse was recorded continuously with a thermograph.

What are the limitations of thermography?

The disadvantages, according to NASA, are the difficulty to obtain accurate data from models that have less thermophysical and radiometric properties. Retrieving accurate data can require infrared-transmitting optics that are not always available. Cameras are not suited for very low temperatures below -50 degrees C.