August 13, 2025

Leaky Hollow-Core Fiber-Based All-Optical Photoacoustic Gas Sensor for Highly Sensitive Detection of Carbon Dioxide.

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MAIN FINDING: The optimized leaky hollow-core fiber photoacoustic sensor achieves a carbon dioxide detection limit of 238.4 ppb.
KEY EVIDENCE: With a lock-in integration time of 227 seconds, this sensor shows significant improvements in sensitivity compared to conventional methods.
APPROACH: The study combines theoretical modeling, finite element analysis, and experimental validation to enhance the sensor's performance.
SIGNIFICANCE: This work advances gas sensing technology by addressing the challenges of the long vibrational-translational relaxation time in carbon dioxide detection.

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An optimized photoacoustic gas sensor detects carbon dioxide with a minimum detectable limit of 238.4 ppb, indicating improved sensitivity.

Zhang et al. (2025) studied this question.

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An optimized photoacoustic gas sensor detects carbon dioxide with a minimum detectable limit of 238.4 ppb, indicating improved sensitivity.