![]() ![]() Another way to think of level is “thermal brightness.” Once the level is optimised, we may find that we are still not using all of the colours in the scale. Infrared thermography of train, showing level (a) and span (b). The solution to this problem is to force the colours to cover the room-temperature scene we are looking at by adjusting the ‘level’ downwards. The whole image will instead have the colour that corresponds to below 50☌ in our scale, which is usually black. If it is 50-100☌ and we are looking at a room-temperature scene, no image will be shown. If, for example, our span is set to 50☌, the colours will be spread out over a 50☌ temperature width. Span is the portion of the total temperature range being used to generate the image. (a) level, (b) span, and (c) temperature range. The image is controlled by selecting a temperature range and setting the level and span… Most infrared thermal imaging cameras allow the operator to manually adjust the brightness and contrast in the image to get the type of result pictured in the right-hand image above. However, the danger of always letting the camera revert to its default settings is that the contrast will be optimised for the whole image and not just for the target object.Ĭheck out these side-by-side images to see how thermal detail on the target object is lost… Infrared thermography of hand. They do this by analysing the radiation distribution across the image and then setting the upper and lower limits of the displayed temperatures in a way that optimises the contrast. Image adjustmentīy default, most infrared cameras continuously adjust the image in the display automatically. The relationship and intensity of the infrared radiation emitted by both the object and by the surrounding environment are therefore important.īrightness and contrast in the thermal image are optimised by adjusting the displayed temperature interval that is displayed. Whereas a normal photograph captures reflected light, infrared thermography captures both emitted and reflected radiation. The image must contain a clear level of detail and display the object at an appropriate size and position. Thermal patterns must be illustrated clearly and temperatures measured accurately. ![]() The aim of infrared thermography is to show an object’s condition. This is often the case in companies where thermography is more of a sideline and staff haven’t been trained to understand what a good thermal image is and how to take one. ![]() Many thermographers, especially those without training, produce reports with thermal images devoid of meaning or, even worse, images that support the wrong conclusion. Images are often included in reports after inspecting electrical installations in buildings, and provide evidence of any faults detected.īut choosing the correct camera settings for different tasks is actually quite difficult. Thermal cameras (infrared cameras) are easy to handle and thermal images quick to take. However, getting the right info is not achieved with a quick snapshot. Infrared thermography is used to visualise hot & cold areas or dampness in a subject. ![]()
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