Margined Horn-Shaped Air Chamber for Body-Conduction Microphone.

Area of Science:

• Acoustics
• Biomedical Engineering
• Animal Behavior

Background:

• Quantitative monitoring of scratching intensity in dogs is crucial for health assessment.
• Existing body-conduction microphones for measuring animal scratching sounds require optimized air chamber design.

Purpose of the Study:

• To compare sound amplification ratios of different sealed air chamber shapes.
• To design an improved body-conduction microphone for measuring animal scratching sounds.

Main Methods:

• Numerical analysis and experimental comparison of air chambers with various shapes.
• Investigated sound amplification ratios for frequencies below 3 kHz.
• Evaluated the impact of air chamber deformation and shape margins on amplification.

Main Results:

• The horn-shaped air chamber demonstrated the highest sound amplification performance below 3 kHz.
• A simulated amplification ratio of 52.5 dB was achieved with a 1 mm height, 15 mm diameter horn-shaped air chamber.
• A margined horn shape maintained consistent amplification ratios under varying pressing forces, with simulated and experimental values of 53.4 dB and 19.4 dB, respectively.

Conclusions:

• The horn-shaped air chamber is optimal for enhancing sound capture in body-conduction microphones for animal scratching detection.
• Design modifications, such as adjusting margins, can ensure reliable performance of the microphone under different conditions.
• This research contributes to more accurate non-invasive monitoring of animal health indicators.