Fig. 1. Schematic of dual-channel lateral shearing interferometric spectral imaging system

Fig. 2. Schematic of optical path of dual-rectangle lateral shearing beam splitter

Fig. 3. Target images superimposed with fringe pattern. (a) Interference image from channel 1; (b) comparison of interference images from two channels; (c) interference image from channel 2

Fig. 4. Simulation results. (a) Ideal spectrum; (b) interferogram acquired by channel 1; (c) interferogram acquired by channel 2; (d) dual-channel differential interferogram; (e) spectra reconstructed from interferograms of channel 1, channel 2 and dual-channel differential detection; (f) ratio between spectral SNR of dual-channel differential detection and that of channel 1

Fig. 5. Experimental setup

Fig. 6. Interference images obtained by two channels. (a) Channel 1; (b) channel 2

Fig. 7. Interferograms and spectral recovery curves acquired by experimental system. (a) Interferogram acquired by channel 1; (b) interferogram acquired by channel 2; (c) dual-channel differential interferogram; (d) target spectral curves reconstructed by proposed method and ocean optics SB4000

Fig. 8. Spectral SNR of experimental system. (a) Spectral SNR of channel 1, channel 2 and dual-channel differential detection; (b) ratio of spectral SNR of dual-channel differential detection and that of channel 1