Of course the low resolution boosted with visual only works in good light, so a small LED light is provided, although that only offers limited assistance at night.īoth versions have a 3-inch touchscreen and can store around 500 images onboard to transfer via Micro USB. The visual camera can also provide a picture-in-picture option. This patented method uses an edge-detection algorithm on the higher-resolution visual light image, overlaying this with the IR image to make the picture easier to comprehend. The IR maxes out at 160 x 120 on the pricier C5, allowing it to take advantage of Flir’s MSX technology. With a rugged body that’ll survive a bit of workplace rough-and-tumble, both have two cameras and a 5 megapixel optical lens. The FLIR C3-X and FLIR C5 (opens in new tab) are good-looking compact thermal imagers that are well suited to DIYers and contractors. Depending on the software, you can also take retrospective measurements from the thermal JPEGs. For professional use, it pays to read up a bit on understanding thermograms, but you’ll understand the basics the moment you power-on your thermal camera. Because IR is part of the electromagnetic spectrum, like visible light, it also has similar properties when it encounters lenses or rain.
Thermal imaging works in the dark, or through smoke, but can be fooled by the reflectiveness (emissivity) of a surface. Meanwhile, refresh rates aren’t always high 9Hz is typical, which is fine for locating hotspots, but not exactly cinematic.
The sensors are also of varying detail (150mK sensitivity means each pixel takes readings to the nearest 0.15˚C, so lower numbers are better). Digitally overlaying the thermal image with a high-resolution, visible one can make understanding the picture easier, and many devices on this list do that. Higher resolutions are always better, allowing you to work at a distance, which is especially important in security and rescue scenarios. See also Best thermal drones (opens in new tab).
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