Abstract

Quantitative measurement of trace ethane is important in environmental science and biomedical applications. For these applications, we typically require a few tens of part-per-trillion level measurement sensitivity. To measure trace-level ethane, we constructed a cavity ring-down spectroscopy setup in the 3.37 μm mid-infrared wavelength range, which is applicable to multi-species chemical analysis. We demonstrated that the detection limit of ethane is approximately 300 parts per trillion, and the measured concentration is in agreement with the amounts of the injected sample. We expect that these results can be applied to the chemical analysis of ethane and applications such as breath test equipment.

Off-axis integrated cavity output spectroscopy with a mid-infrared interband cascade laser for real-time breath ethane measurements

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Ultra-sensitive cavity ring-down spectroscopy in the mid-infrared spectral region

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Widely-tunable mid-infrared ring cavity pump-enhanced OPO and application in photo-thermal interferometric trace ethane detection

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Opt. Express 28(4) 4550-4562 (2020)

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Parts per trillion sensitivity for ethane in air with an optical parametric oscillator cavity leak-out spectrometer

Golo von Basum, Daniel Halmer, Peter Hering, Manfred Mürtz, Stephan Schiller, Frank Müller, Alexander Popp, and Frank Kühnemann
Opt. Lett. 29(8) 797-799 (2004)