Novel Helmholtz resonators parallel to lateral closed resonators for sensing applications

Area of Science:

• Acoustics
• Sensing Technology
• Materials Science

Background:

• Helmholtz and lateral closed resonators are crucial for gas sensing.
• Periodic arrangements offer potential for enhanced sensing capabilities.
• Defect engineering is a promising strategy to tune resonator performance.

Purpose of the Study:

• To investigate the design of Helmholtz and lateral closed resonators for gas sample detection.
• To analyze the impact of a defect on the performance of a periodic resonator array.
• To optimize the resonator system for enhanced sensitivity, quality factor, and detection limit.

Main Methods:

• Numerical simulations using the finite element method were employed.
• Analysis of acoustic wave transmission and resonant frequencies.
• System performance evaluated with and without a defect in a periodic parallel arrangement.

Main Results:

• A defect induces localized modes, significantly increasing sensitivity to frequency shifts.
• Optimal performance, including improved sensitivity and quality factor, was achieved with 9 periods.
• The sensor demonstrated high selectivity for gas mixtures and stability over a wide temperature range.

Conclusions:

• The defect-engineered resonator system shows high potential for precision gas sensing.
• Geometric parameters and gas properties critically influence sensor performance.
• The proposed sensor is suitable for environmental monitoring and biosensing applications.