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Natural frequency results in three environments: (a) the thermal imager in a dark environment, (b) accelerometers in a dark environment, (c) the thermal imager in a hindered environment, (d) accelerometers in a hindered environment, (e) the thermal imager in a hazy environment, and (f) accelerometers in a hazy environment. (Acce.: accelerometers; IRT: infrared thermography).
