High-SNR snapshot multiplex spectrometer with sub-Hadamard-S matrix coding

[摘要] We present a robust high signal-to-noise ratio (SNR) snapshot multiplex spectrometer with sub-Hadamard-S matrix coding. Traditional Hadamard Transform Spectrometer (HTS) must vary the coding mask to obtain a reliable spectrum result, causing unexpected time consumption. Unlike traditional HTS, the proposed snapshot spectrometer comprises two imaging paths: non-dispersive and dispersive imaging paths; the additional non-dispersive imaging path is used to capture the light intensity of the coded aperture. Both light intensity of the coded aperture as well as the overlapped spectra are captured within one shot, turning Hadamard-S matrix coding into sub-Hadamard-S matrix coding. The simulated and experimental results obtained demonstrate for the first time that compared to Hadamard-S matrix used in HTS, the sub-Hadamard-S matrix could achieve similar SNR improvement and denoising capacity as well as maintain snapshot.

[发布日期] 2019-12-15

[关键词] Spectrometer;Snapshot Hadamard transform spectrometer;Spectrum;Coded aperture