In the above example, courtesy of Keltbray using the DJI M300 RTK and H20T camera, the thermal image detected an overheating cable joint - highlighted by the bright red and not seen on the visible image. The hotter an object is, the more thermal energy it emits and generates a heat signature. Whilst the optical sensor is sensitive to visible light, the thermal sensor is sensitive to radiated energy. The below image depicts the same scene captured using an optical sensor and a thermal sensor, however, as you can see, the data provided is completely different. Thermography enables the assessment of temperature based on radiation. Once you convert it to a visible image, you can differentiate between temperatures by assigning them a different colour. Thermal sensors capture infrared images, thus allowing people to see what their eyes can’t: Invisible heat radiation emitted or reflected by all objects, regardless of lighting conditions. Infrared isn’t visible to the human eye, but you can feel it as radiated heat when it increases in intensity.
Radiation is emitted by everything around us (above absolute zero) and includes visible light (which occupies a small part of the EMS) and non-visible light. Thermography is the process of using sensors to create images of radiation in the Infra-Red (IR) section of the Electromagnetic Spectrum (EMS). To learn which thermal drones and cameras are best for you, read our blog here. To help you harness the power of thermal technology, we've prepared this in-depth guide to using a thermal camera. Things like emissivity, distance from your target, atmospheric conditions, time of day and even choosing the right thermal colour palette all need to be considered. Thermography is far more complex than that, with a host of factors determining the quality of your results.
Sounds great! But it's important to remember that, no matter the advancements in drone thermal imaging technology, it is not as easy as simply deploying the aircraft, pressing record and capturing thermal data. Such situational awareness is invaluable, and it's no secret that thermal imaging can benefit a range of industry applications, from public safety through to industrial inspection. This picture instantly shows the benefits of using a drone with a thermal camera.Ĭaptured by London Fire Brigade, this thermal image - clearly showing the hot spots of the blaze - enabled crews to specifically target the source of the fire, instead of focusing on the plumes of smoke which were coming from another part of the building.
Radiometric vs Non-radiometric - what's the difference and how they impact your data.Isotherms, high/low grade and thermal sensitivity - thermal imaging terminology explained.Learn about the thermal colour palettes and what they mean.Emissivity and atmospheric conditions - how they affect your results.In-depth guide to using a drone with a thermal camera.
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