Abstract
Photoacoustic (PA) spectroscopy techniques enable the detection of trace substances. However, lower threshold detection requirements are increasingly common in practical applications. Thus, we propose a systematic geometry topology optimization approach on a PA cell to enhance the intensity of its detection signal. The model of topology optimization and pressure acoustics in the finite element method was exploited to construct a PA cell and then acquire the optimal structure. In the assessment, a thermo-acoustic model was constructed to properly simulate the frequency response over the range of 0–70 kHz and the temperature field distribution. The simulation results revealed that the acoustic gain of the optimized cell was 2.7 and 1.3 times higher than conventional cells near 25 and 52 kHz, respectively. Moreover, the optimized PA cell achieved a lower threshold detection over a wide frequency range. Ultimately, this study paves a new way for designing and optimizing the geometry of multifarious high-sensitivity PA sensors.
Highlights
Photoacoustic spectroscopy (PAS) is a typical analytical tool employed to probe the information of chemical composites by measuring the optical absorption characteristics of samples [1,2,3,4,5]
Where P represents the output light power of the radiation source, γ denotes the ratio of the specific heat capacity of the carrier gas at constant pressure to constant volume, Q is the quality factor of the resonator, A is the cross-section area of the resonator, f is the modulation frequency of light source that is equal to the selected resonance frequency of a PA cell, Photonics 2021, 8, x FOR PEER REVIEW
Where P represents the output light power of the radiation source, γ denotes the ratio of the specific heat capacity of the carrier gas at constant pressure to constant volume, Q is the quality factor of the resonator, A is the cross-section area of the resonator, f is the modulation frequency of light source that is equal to the selected resonance frequency of a PA cell, α is the optical absorption coefficient of the measured species, and M is the microphone sensitivity
Summary
Photoacoustic spectroscopy (PAS) is a typical analytical tool employed to probe the information of chemical composites by measuring the optical absorption characteristics of samples [1,2,3,4,5]. Sim et al [18,19] proposed a dominant resonance mode to match a microphone and opened cell This method was able to effectively improve the signal-to-noise-ratio (SNR) and reduce the detection limit. In this work, taking noninvasively glucose monitoring as an example, a topology optimization method is proposed to strengthen the entire performance of a conventional. The simulation results illustrate that the “cardiac-type” cell performed significantly better than the conventional one with respect to amplification gain and Q value This topologically optimized PA cell is capable of achieving a high detection performance, which will pave a new way for highly sensitive nondestructive detection
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