基 于 消 色 差 透 镜 的 单 像 素 与 计 算 关 联 光 谱 成 像

The influence of chromatic aberration in a spectral imaging system leads to spectral overlap of an image. This study combines single-pixel imaging and computational ghost imaging in a spectral imaging system，with an achromatic lens of 900-1 700 nm focal length to correct for chromatic aberration. First，the chromatic aberration of achromatic lenses made of different materials was calculated，and a suitable lens was selected accordingly；its aberration-correction was improved by an order of magnitude compared with other lenses. Second，the effects of chromatic aberration on spectral imaging systems and the differences between single-pixel imaging and computational ghost imaging were analyzed. Finally，two spectral imaging systems were compared through simulation and experimental analysis. The experimental results indicate that in the 900-1 700 nm wavelength range，the single-pixel spectral imaging system based on an achromatic lens achieves better image reconstruction results，with peak signal-to-noise ratio（PSNR）］and structural similarity（SSIM）improvements of 3. 93 dB and 0. 96%，respectively. Simulations and experiments verify that the near-infrared single-pixel spectral imaging system based on an achromatic lens performs better than computational ghost spectral imaging.