基于压缩感知的AOTF光谱测量方法
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中国科学院上海技术物理研究所

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An Acousto-Optic Tunable Filter Spectral Measurement Method based on Compressed Sensing
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Shanghai Institute of Technical Physics, Chinese Academy of Sciences

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    摘要:

    基于声光可调谐滤光器(AOTF)的光谱仪器已经在生物医学、农业、航空航天等领域中广泛应用。然而,传统的AOTF光谱仪难以实现在提升系统光通量的同时,保持光谱分辨率及降低采样次数。针对上述问题,本文提出了一种基于压缩感知理论的AOTF光谱测量方法,利用AOTF可多频驱动的特点,在光谱维度上实现稀疏随机编码复合光信号调制,可利用单元或面阵探测器顺次记录完成压缩采样,再通过压缩感知重建算法获得目标光谱曲线或光谱图像数据立方体。为了验证本方法的有效性,我们利用实际测量得到AOTF光谱透过率真实值数据,仿真了压缩采样和目标数据恢复效果,结果表明,该方法可以通过202次压缩采样,可以重构得到512个波长点的光谱数据,光通量可以提升5倍,且与逐波长点采样得到的数据具有较高的相似度。与传统逐波长点扫描的采样方式相比,该方法能够在保持原有光谱分辨率的前提下大幅减少总采样次数,提高系统的光通量,同时还实现了压缩比0.39的光谱数据压缩,在微弱信号检测、物质快速识别以及光谱数据压缩等应用具有十分重要的意义。

    Abstract:

    Acousto-Optic Tunable Filter (AOTF) based spectroscopy instruments have been widely applied in biomedical, agricultural, aerospace and other fields. However, the conventional AOTF spectrometers struggle to achieve increased system luminous flux while maintaining spectral resolution and reducing the number of samples. To address the above problems, this paper proposes an AOTF spectral measurement method based on compressed sensing (CS) theory. Sparse randomly coded composite optical signal modulation in the spectral dimension using the multifrequency acousto-optic diffraction of AOTF. A modulated composite optical signal is obtained in the spectral dimension and recorded sequentially using cell or plane array detectors. The original spectrum or spectral image data cube is then obtained by compressed sensing reconstruction algorithms. In order to verify the effectiveness of this method, we simulated the effect of compressive sampling and target data recovery by using the actual measurement to obtain the real value of AOTF spectral transmittance data. The simulation results show that the method can reconstruct the spectral data of 512 wavelength-points by 202 times compressive sampling, and the luminous flux can be improved by a factor of 5, and it has a high similarity with the data obtained by wavelength-by-wavelength acquisition. Compared with the conventional wavelength-by-wavelength point-scan sampling method, this technique can provide higher throughput and fewer measures while maintaining spectral resolution. Besides, the spectral data compression with a compression ratio of 0.39 was also achieved during the sampling process. It is of high significance in applications such as detection of weak signals, rapid identification of substances, and compression of spectral data.

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  • 收稿日期:2022-03-16
  • 最后修改日期:2022-05-18
  • 录用日期:2022-05-30
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