A spatial light dispersion-based spectrometer is experimentally demonstrated for broadband gas absorption spectroscopy with time resolving capability. A diffraction grating combining with a plane-array camera serves as the spatial dispersion system operated in the near-infrared (NIR) waveband. Spectrum with a bandwidth of 40 nm can be acquired via a single exposure of the camera running in the line mode with 640 ×4 pixels. With the data stream transmitted to the computer and stored in real time, the time resolution for continuous spectrum measurement reaches 200 μs, which is validated by monitoring the spectral evolution of a broadband amplified spontaneous emission (ASE) under impulsive intensity modulation. Adopting the ASE light source and a multi-pass gas cell, carbon monoxide (CO) absorption is spectrally characterized with a 16-nm bandwidth, and the gas concentration retrieval based on the entire obtained absorption spectrum is performed, in which an averaged mean absolute percentage error (MAPE) of 5.6% is achieved.
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