Modelling of open photoacoustic resonators

Area of Science:

• Acoustics
• Spectroscopy
• Computational Physics

Background:

• Photoacoustic spectroscopy utilizes acoustic resonators for signal amplification.
• Open resonators are preferred in certain applications but reduce signal sensitivity due to their opening.
• Existing simulation methods struggle to accurately model the effects of openings in resonators.

Purpose of the Study:

• To develop and validate new finite element modeling approaches for simulating photoacoustic signals in open acoustic resonators.
• To improve the design and optimization of open resonators for enhanced photoacoustic measurement sensitivity.
• To extend the performance of the viscothermal model with perfectly matched layers to the ultrasound region.

Main Methods:

• Developed two new finite element modeling approaches: amplitude mode expansion and viscothermal models.
• Modeled resonator openings using perfectly matched layers and boundary element methods.
• Extended the viscothermal model with perfectly matched layers for ultrasound simulations.

Main Results:

• The proposed simulation approaches accurately predict photoacoustic signals in open resonators.
• Simulation results were validated against experimental photoacoustic measurements.
• The viscothermal model with perfectly matched layers demonstrated effective performance in the ultrasound region.

Conclusions:

• The new simulation methods provide an accurate basis for designing and optimizing open resonators.
• These approaches can lead to significant improvements in photoacoustic measurement sensitivity.
• The validated models offer a powerful tool for advancing photoacoustic spectroscopy applications.