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仪器网/ 行业应用/ 解决方案/ 混浊介质角域成像(ADI)实验中光传播时间门控和偏振优选

混浊介质角域成像(ADI)实验中光传播时间门控和偏振优选

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Angular Domain Imaging (ADI) employs an angular filter array to accept photons within a small acceptance angle
along the axis of an aligned laser light source and preferentially reject scattered light. Simulations show that the
accepted photons travel the shortest paths between source and detector and are therefore the earliest to arrive. We
fabricated angular filter arrays using silicon bulk micromachining and found that an array of 60 m square shape microtunnels
1 cm in length accepted photons within 0.48 degree of axis of the micro-tunnels. This small acceptance angle
rejected most of the scattered light and sub-millimeter resolution targets could be resolved in a few centimeters of turbid
medium with at least six times reduced mean free path. ADI through media with higher scattering coefficients was not
achievable due to unwanted acceptance of late arriving scattered photons. To reject the late arriving photons, we added
time-domain filtration and linear polarization to ADI. The implementation of a time-gated camera, a 780 nm femtosecond
pulsed laser, and linear polarization to our ADI system resulted in improved image contrast. The use of ADI
with time-gating (gate width 250 ps) and linear polarization enabled visualization of sub-millimeter absorbing objects
with approximately eight times higher image contrast compared to ADI in a scattering medium equivalent to six times
reduced mean free path. 超快门宽增强型CCD相机
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