Measurements of atmospheric attenuation at ultrasonic frequencies and the significance for echolocation by bats.

@article{Lawrence1982MeasurementsOA,
  title={Measurements of atmospheric attenuation at ultrasonic frequencies and the significance for echolocation by bats.},
  author={Brandon D. Lawrence and John A. Simmons},
  journal={The Journal of the Acoustical Society of America},
  year={1982},
  volume={71 3},
  pages={585-90}
}
The absorption of sound propagating through the atmosphere under laboratory conditions of 25 degrees C and 50% relative humidity was measured at frequencies from 30 to 200 kHz. The attenuating effect on the passage of ultrasonic sounds through air ranged from 0.7 dB/m at 30 kHz. These measurements confirm theoretical expectations and earlier observations that atmospheric attenuation is progressively more severe at higher frequencies and that the atmosphere acts as a low-pass filter for… CONTINUE READING
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