Not only was the XT thermal camera able to identify the heat signatures of people at night, but drones themselves were discovered to emit a heat signature that could be readily detected by a pilot viewing the first-person view of what the XT camera was capturing. This is an actual photograph of the Inspire 1 controller viewing the XT camera output.
9.8 Proof of Concept 2: Aerial Broadcast Proof of Concept 2 determined how aerial broadcasting might be used to warn groups of people of potentially hazardous events without the need for public address system infrastructure, radios, or a functioning communications grid. A Mavic 2 Pro drone was outfitted with its broadcast speaker option and recorded messages were broadcast to the test teams gathered outdoors. The recordings were clearly audible by all attending with the drone at approximately 70 feet of altitude. 9.9 Proof of Concept 3: How loud in Decibels (dB) are Inspire 2 Drones? Proof of Concept 3 tested how loud the Inspire 2 drones were in delivery operations to ensure that they can operate safely in an emergency delivery environment without damaging the hearing of people nearby. Normal conversation is about 60 dB, a lawnmower is about 90 dB, and a loud rock concert is about 120 dB. The National Institute of Occupational Safety and Health (NIOSH) has established the Recommended Exposure Limit to avoid hearing damage as 85 dB averaged over an 8 hour period. A decibel meter was used to measure the decibels present when the Inspire 2 drone was at various altitudes. Here are the results of the test:
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