Light splitting module for obtaining spectrums and dual-mode multiplexing optical device

A dual-mode multiplexing optical device, comprising:

• a light splitting module for obtaining spectrums of an object to be tested, which sequentially comprises a light entrance window, a diffuser and a filter array along a light entrance direction, wherein a size of the filter array is Dx×Dy, maximum divergent angles of the diffuser along a horizontal direction and a vertical direction thereof are respectively θx and θy, a distance d between the filter array and the diffuser meets
• 0
• <
• d
• ≤
• min
• ⁢
• {
• D
• x
• 2
• ⁢
• cot
• ⁢
• ⁢
• θ
• x
• ,
• D
• y
• 2
• ⁢
• cot
• ⁢
• ⁢
• θ
• y
• }
• ,
• the light entrance window is made from materials which is transparent at specific bands, the specific bands are target bands of the light splitting module, the filter array is an angle modulated filter array which has multiple subareas and comprises multiple filters with different center wavelengths respectively corresponding to the subareas, a maximum divergent angle of the diffuser is θmax=max {θx, θy}, and a maximum adjustable angle α of the filters of the filter array meets α≦θmax;
• an illumination module adapted for providing the object to be tested with illumination;
• and
• a light field imaging module adapted for achieving light field imaging of the object to be tested, which sequentially comprises a convergent lens, a microlens array, a detector and a first control circuit along the light entrance direction, wherein:
• the convergent lens converges lights from the filter array on a plane of microlenses of the microlens array, the microlens array projects lights from the filters corresponding to the microlenses on the detector in a form of spectrums, the detector detects the spectrums or light field imaging results of the object to be tested, the first control circuit controls the detector to shoot the spectrums and the light field imaging results,
• wherein:
• the illumination module and the light splitting module form a whole, the illumination module is placed at one side of the light entrance window of the light splitting module, the light splitting module is in detachable connection with the light field imaging module.