Mathematical Analysis and Micro-Spacing Implementation of Acoustic Sensor Based on Bio-Inspired Intermembrane Bridge...

Area of Science:

• Biomimetics
• Acoustics
• Bioacoustics

Background:

• The auditory system of Ormia ochracea, a parasitic fly, exhibits remarkable sound localization capabilities.
• Improving the directional hearing and acoustic localization of small electronic systems is an ongoing challenge.

Purpose of the Study:

• To investigate the auditory localization mechanism of Ormia ochracea.
• To develop a microscale acoustic localization device inspired by the Ormia ochracea auditory organ.
• To enhance the performance of small acoustic systems in detecting sound source direction and weak signals.

Main Methods:

• A biomimetic approach was used, focusing on the coupled membrane-beam structure of the Ormia ochracea ear.
• A microscale device was designed and implemented, featuring coupled circular membranes and an elastic beam.
• The device's response to varying sound incident angles was analyzed to assess its localization capabilities.

Main Results:

• The intermembrane bridge structure effectively amplifies the magnitude and phase differences in membrane responses.
• The biomimetic device demonstrated improved sound source localization and directional weak acoustic signal acquisition.
• The recognition rate for phase difference and amplitude ratio was significantly enhanced.
• Theoretical resolution for sound source incident angle reached 2° with a 5° phase difference recognition rate.

Conclusions:

• The intermembrane bridge bionic structure is crucial for enhancing sound source localization and weak signal detection.
• The developed microscale acoustic device shows potential for applications requiring precise directional sound sensing.
• The optimal operating frequency range for this bionic coupling device is 300 Hz to 1500 Hz.