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Radiometer on fire

28.02.2011

A device has been created that can distinguish the source of a fire even underground. To easily overcome a forest fire, you need to notice its source in time. Alas, as a rule, it is hidden by vegetation, and sometimes it can even be located under the soil surface. Devices installed on fire planes that study signals in the infrared range cannot recognize such foci.

Scientists from the Fraunhofer Institute for High Frequency Physics and Radar Technology, led by Dr. Nora von Wahl, decided to create a new device. They noticed that particles of dust, smoke, and plant branches are practically transparent to microwave radiation at a frequency of 22 GHz.

Having made a receiver operating at this frequency, they hung it in the air on a balloon robot. As measurements have shown, such a device at a height of one hundred meters sees a fire seat five by five meters in size, with an accuracy of 2,5 meters. The infrared sensor is more accurate, but the microwave one sees much better - even the layer of soil above the fire does not matter to him, and this is especially true when fighting peat fires.

Scientists hope to make the device smaller and more accurate, after which it can be used to protect forests. At least the German ones.

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