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针对目前微型光谱仪器光通量低,不利于微弱信号检测分析的问题,设计了基于哈达玛变换的近红外光谱仪,提出一种互补S矩阵编码调制的方案;通过建立以数字微镜为核心的坐标体系模型,详细推导了互补S矩阵编码调制算法对于能量的增强理论。实验结果表明:S矩阵编码组合测量较逐次扫描测量光能量有了明显增强,但是依然丢失近一半的光谱能量;而互补S矩阵编码方案可以在S矩阵编码调制的基础上,补偿其关状态微镜单元上损失的能量;当光谱信号极其微弱时,逐次扫描方式所测得的光谱信号淹没于噪声信号中,而S矩阵编码与互补S矩阵编码测得的光谱信号依然可辨,并且在噪声抑制方面,互补S矩阵优于S矩阵,与理论分析基本吻合。
Aiming at the problem of low luminous flux of micro-spectrometer and unfavorable to weak signal detection and analysis, a near-infrared spectrometer based on Hadamard transform was designed and a scheme of complementary S-matrix coding and modulation was proposed. By setting up a coordinate system with digital micro- Model, the derivation of the complementary S matrix coding modulation algorithm for energy enhancement theory. The experimental results show that the S-matrix code combination measurement has significantly enhanced the energy of the measurement light, but still lost nearly half of the spectral energy. The complementary S-matrix coding scheme can compensate for the off-state micro-scale based on the S-matrix code modulation When the spectral signal is extremely weak, the spectral signal measured by the successive scanning mode is submerged in the noise signal, and the spectral signal measured by the S matrix coding and the complementary S matrix coding is still discernible, and when the noise In terms of suppression, the complementary S matrix is better than the S matrix, which is in good agreement with the theoretical analysis.