Shh! Intensive care incubators resonate sounds and risk damage to prematurebabies' hearing, scientists say frontiersin
), sound sources in the incubator environment whose spectral maxima are in the 6 kHz range are particularly dangerous here. These are mainly found in the respiratory support. According to our measurements, the respiratory support starts to be risky for the hearing health at a flow rate of 8 L/min at 84.72 dBSPL with an increase to 89.96 dB at 10 L/min and 93.13 dB at 12 L/min.
2) If the natural resonance of the outer ear canal is about 6000 Hz according to Kruger , then it must be remembered that this value applies to the transmission of airborne sound. In its natural environment, the embryo is surrounded by water, which is why, for the calculation of the intrinsic resonance of the outer ear canal, we can no longer assume a sound velocity of approx. 343 m/s at 20°C, but a sound velocity in water of approx. 1.484 m/s at 20°C.
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