The location of the source-detector relative to the anomaly whose optical properties is different from normal tissue has an important influence on the detection effect based on near - infrared spectroscopy for intracranial anomaly detection. In this study we propose a distribution structure of Single-Source Multi-Detectors (SS-MD) in order to realize the rapid localization of intracranial anomaly. A novel approach we use differential optical density difference to determine the location of anomaly, since the shape of the differential optical density curve of the two adjacent detectors is significantly related to the position of the anomaly.The finite element optical simulations were performed on anomaly with different sizes, horizontal positions and depths using SS-MD distribution structure. The distribution structure of SS-MD and the differential optical density difference curve can be used to quickly and accurately realize the localization of the anomaly, which plays an important role in optimizing the location of the source-detectors in the near infrared spectroscopy and improving the accuracy of the clinical detection of anomaly.
A new hollow nanoshell semiconductor was applied for generating smoke screen, and the dispersion and infrared jamming performance were researched. Firstly, the mircostructures and dispersion performance of the screen particles were analized by using SEM and cascade impactor; basing on the findings, the jamming performance of the screen to 8-12μm infrared light, 1.06 μm laser and 10.6 μm laser were examined, and the primary affecting factors and relationships got concluded. The results show that the dispersion performance is favorable as the diameters of more than 70% smoke particles are below 6.1μm; the smoke screen has better and satisfactory jamming performance to IR and laser as within 10 min, the decay rate maintains above 85% to 8-12μm IR and 90% to 1.06μm laser and10.6μm laser.