Acoustic impedance of the maternal abdomen.

@article{Wodicka1993AcousticIO,
  title={Acoustic impedance of the maternal abdomen.},
  author={G R Wodicka and Arthur M. Lam and Valmik Bhargava and D Sunkel},
  journal={The Journal of the Acoustical Society of America},
  year={1993},
  volume={94 1},
  pages={13-8}
}
Contact sensors to monitor fetal heart, breathing, and movement sounds with increased sensitivity and bandwidth are under development. To understand the inherent acoustical properties of the maternal abdomen and its interaction with these sensors, the driving-point impedance Z(j omega) was measured in nine women during their last trimester of pregnancy. An electromechanical shaker with a contact area of 2.85 cm2 produced abdominal vibrations between 10 and 500 Hz, and the resulting force and… CONTINUE READING

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