What is thermography and when is it useful

There thermography is an analysis technique based on the acquisition of infrared images. The thermographic images can be acquired through the so-called "remote sensing", a method that involves the use of defined toolsthermal imaging cameras or with the aid of liquid crystal detectors, the latter is a medical technique used for example, for the diagnosis of particular tumors such as in the analysis ofbreast thermography.

On this page we will focus onthermographywith tthermal imaging camera, very useful analysis in the building and photovoltaic sector.

What is thermography?

In simple terms, thethermographyit allows us to evaluate, in an instantaneous way, the heat (thermal energy) emitted by radiation from a surface. To make a thermography you use a device called "thermal imaging camera"; to make an illustrative comparison, thethermal imaging camera it is like a camera equipped with special sensors capable of detecting the surface temperature of the bodies and making it readable in a color map.

Thethermal imaging camerasdetect radiation in the infrared range of the electromagnetic spectrum and perform measurements related to the emissions of these radiations. As can be assumed from what has been said so far, there is a correlation between radiation in the infrared field and temperature: the amount of radiation emitted increases proportionally to the fourth power of the absolute temperature of an object as specified by Stefan Boltzmann's Law.

Using this principle, thethermographyallows you to identify anomalies in the emission of thermal energies and for this reason it is very useful in construction, especially when it comes to energy efficiency, insulation and thermal bridges.

Thanks tothermographyit is possible to carry out a large number of checks in the construction field:

  • verification of the degree of thermal insulation / insulation
  • verification of waterproofing
  • analysis of the degradation due to humidity
  • identification of thermal bridges to be eliminated
  • search for causes of water infiltrations
  • identification of hidden construction elements
  • search for hot spots in the thermography of photovoltaic systems
  • preliminary investigation for energy certification

In daily practice thethermographyit is used, in the photovoltaic field, to identify non-functioning modules; in the construction field it is widely used to detect humidity in masonry, reinforced concrete ceiling structures, heat losses due to poor insulation, presence of electrical system ducts, identify the presence of ducting of hydro-sanitary and thermal systems in operation , identify the different materials of structural elements of a building.

Thermography of a photovoltaic system

In the article "Photovoltaic system that does not produce energy" we analyzed the need to exploit the images obtained with a thermographic analysis to identify non-functioning cells through the so-called "effectHot Spot"Detectable with the thermography. In particular we have seen:
-what is the thermography of a solar system for?
- when it is useful to make a thermography of the photovoltaic system
-what do the thermographic images of a solar plant signal
- the checks to be made before a thermographic survey
- what to do after performing an implant thermography

Video: Introduction to Thermography (November 2021).