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September 5, 2025AtmosphereOpen Access

Low-Cost, LED-Based Photoacoustic Spectrophone Using Hemispherical Acoustic Resonant Cavity for Measurement of Hydrocarbon Gases

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Low-cost system measures hydrocarbon gases with sensitivities of 111.6 ppm for isobutane, suggesting potential for gas sensing applications.

The system achieved a measurement sensitivity of 111.6 ppm for isobutane, indicating high performance.
Hemispherical acoustic resonant cavity utilized reduces volume while enhancing effective gas absorption path length.
Optimizing the light source and transducer placement improved the generation efficiency of the photoacoustic signal.
Results highlight the potential for widespread sensor networks and atmospheric monitoring applications.

Wang et al. (2025) studied this question.

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Low-cost system measures hydrocarbon gases with sensitivities of 111.6 ppm for isobutane, suggesting potential for gas sensing applications.