Applied Physics Letters· 2026Q1
Scattering-free subwavelength acoustic direction sensing via virtual acoustic resonance
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- 2026year
Short summary
A novel virtual resonance approach enables scattering-free acoustic direction sensing with a mean error of ~2.5° at subwavelength spacing (< λ/8) by converting phase differences to amplitude asymmetry in the analog front-end.
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Key points
- Introduces a virtual resonance approach for analog phase-to-amplitude transduction in acoustic sensing.
- Mechanism relies on interference between symmetric and antisymmetric modes in coupled electronic resonators.
- Enables scattering-free sensing and robust amplitude asymmetry from small phase gradients.
- Achieved a mean error of ~2.5° for direction-of-arrival estimation at subwavelength spacing (< λ/8) in experiments.
AI-generated from the title and abstract; the full text is not read.
Abstract
Conventional direction sensing relies on digital phase extraction after analog-to-digital conversion, which becomes computationally demanding as subwavelength phase differences shrink. Here, we introduce a virtual resonance approach that performs phase-to-amplitude transduction in the analog front-end before heavy digital post-processing. The mechanism is based on interference between symmetric and antisymmetric modes in conservatively coupled electronic resonators, enabling robust amplitude asymmetry from small phase gradients while preserving a scattering-free sensing field. Experimentally, a compact acoustic imaging system achieves high-fidelity direction-of-arrival estimation with a mean error of ∼2.5° at subwavelength spacing below λ/8.
The authors' abstract, as published at the source. Applied Physics Letters, 2026 · DOI ↗
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Field: Mechanics of Materials
Mechanics of MaterialsEngineering