"thermal imaging" meaning in English

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      "examples": [
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          "ref": "2022 February 9, Tom Allett, “The BTP's eyes and ears in the air”, in RAIL, number 950, pages 50, 51:",
          "text": "Thermal imaging cameras give drones the ability to operate by day or night. [...] On this occasion, using a normal visual camera plus a thermal imaging one, we used a drone to 'sweep' the track, looking for any trespassers that were immediately apparent.",
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        "Synonym of thermography"
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        "(physics) Synonym of thermography"
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          "word": "thermography"
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  "word": "thermal imaging"
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        "(physics) Synonym of thermography"
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  "word": "thermal imaging"
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