由于传统的望舌诊断法过于依赖中医师的经验判断,导致误诊的概率相对较大,而基于图像处理的舌诊法受光源、图像采集设备影响较大,同时对于病理不同而颜色相近的舌象识别率不高.为了克服上述缺点,利用舌光谱的“指纹效应”,通过使用光谱法来对不同性状的舌象进行诊断,为了实现这一目标,研制了一款用于舌象诊断的光谱仪,同时为了克服传统分光器件的不足,分光系统中采用了平场全息凹面光栅作为分光器件,能保证系统小型化、光通量利用率提高的同时,改善光谱成像的质量和分辨率.通过系统实验测试,该光谱仪的光谱范围达到340～850 nm,分辨率优于2nm,同时通过模拟实验充分验证了该系统的有效性.%The traditional tongue inspection method should be urgently improved due to the relative large diagnosis error probability caused by the excessive dependence on the Chinese physician's experience and judgment.But the application of tongue diagnosis based on image processing is limited by some factors imluding the performance of light source,image acquisition device and the low recognition rate of simihr color for different diseases.In order to overcome these drawbacks,the spectroscopy method was employed to analyze the tongue by using the unique fingerprint effect of tongue spectrum.A spectrometer for tongue diagnosis (STD) was develold to achieve this goal in this paper.Meanwhile,to overcome the shortcomings of traditional lightsplitting devices,a plane holographic concave grating was used as the diffractive grating,which not only can improve the luminous flux efficiency and miniaturize system,but also improve the spectral imaging quality and resolution.Experimental results demonstrated that the spectral range of STD reached 340～850 nm,and its spectral resolution is better than 2 nm.And the result of simulation experiment validated the feasibility of spectrometer's system.
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