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Answers to common questions Technical Notes
Answers to common questions
      Although more and more people are familiar with thermal imaging and its applications, a lot of questions still remain. How far can you see with a thermal imaging camera? What happens when there is rain or fog? Are lenses of a thermal imaging camera made of glass as well? Do they need to be cleaned? The followingtechnicalnotes try to answer some of these questions.

Are thermal cameras damaged by solar radiation
Situations can occur where a thermal imaging camera is looking directly at the sun. For some thermal imaging cameras
this can fry the detector. In this technical note you can read that FLIR Systems thermal imaging cameras are not
damaged by solar radiation.

Uncooled detectors for thermal imaging cameras
     In the last few years thermal imaging has found its way into many more commercial applications. Most of these applications
require a low cost product with an uncooled detector. These sensors image in the LWIR, or longwave
infrared band (7 - 14 µm). Different types of uncooled detectors are available on the market. Since the infrared detector
is the heart of any thermal imaging camera, it is of the utmost importance that it is of the best possible quality.
     Uncooled detectors are made of different and often quite exotic materials that each have their own benefits.
Microbolometer-based detectors are either made out of Vanadium Oxide (VOx) or Amorphous Silicon (a-Si) while there

What is the difference between a cooled and an uncooled thermal imaging camera
     Long-range surveillance in low-light conditions or total darkness is a perfect application for thermal imaging technology.
This type of surveillance is often required at borders or for large perimeters where most threats occur at night.
     There are however a multitude of choices of thermal imaging camera systems for mid to long-range surveillance in the
commercial marketplace. An often asked question is. Should I use a cooled or an uncooled thermal imaging system and
which one is the most cost effective?

Can thermal imaging cameras see through fog
Although thermal imaging cameras can see in total darkness, through light fog, light rain and snow, the distance they can see is affected by these atmospheric conditions. The article explains how and how much the range performance of a thermal imaging camera is affected by fog.
Do thermal imaging cameras need wipers
Because thermal imaging cameras can also be used in light rain, fog, snow, smoke and other extreme environments, the questions often rises: Is water or dust on the lens obstructing the vision of the thermal imaging camera? Is it necessary to install wipers before the lens of the thermal imaging camera so that water and dust can be removed?

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