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Implementation of an embedded harmonic demodulation algorithm for nitrous oxide laser spectroscopy
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DOI：10.1117/1.OE.65.4.044101.png)
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Abstract
En 中文
Accurate retrieval of nitrous oxide (N2O ) concentration is of great significance for greenhouse gas emission assessment and climate change research. Wavelength modulation spectroscopy (WMS), as an implementation of tunable laser absorption spectroscopy, has been widely applied to trace gas detection due to its high sensitivity. However, the measurement performance of WMS is largely constrained by the harmonic demodulation strategy, particularly in terms of real-time capability and computational complexity. We propose a WMS harmonic demodulation scheme tailored for an N2O measurement system, with the objective of improving real-time processing capability, measurement accuracy, and long-term stability. The proposed method employs a short-time Fourier transform to perform time-frequency analysis of the modulated signal, enabling direct harmonic amplitude extraction and, compared with conventional reference-signal-mixing-based demodulation schemes, achieving high-fidelity estimation and favorable real-time processing performance. The proposed demodulation algorithm is implemented and validated on an ARM Cortex-A72-embedded processing platform within a self-developed N2O measurement system. Experimental results demonstrate that the proposed approach achieves millisecond-level harmonic demodulation and a detection limit at the parts per billion level. We provide an effective signal processing solution for real-time N2O detection on resource-constrained embedded platforms.
Keywords:
tunable laser absorption spectroscopy
wavelength modulation spectroscopy
nitrous oxide measurement
harmonic demodulation
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