نتایج جستجو برای: reflectivity
تعداد نتایج: 6420 فیلتر نتایج به سال:
In this Letter, we experimentally show that transient phenomenons in self-mixing signals from a moving target contain information about the target reflectivity and distance. These transient phenomenons are well explained with a dynamical model of the laser diode, which is used to trace an abacus giving the target reflectivity and distance from a measured high-bandwidth, self-mixing signal.
re = 2.818 × 10−15m is the classical electron radius, ρe is the electron density of the material, and μx is the absorption length. With δ > 0 we find that n < 1, which leads to the phenomenon of so-called total external reflection for incident angles αi below the critical angle αc = √ 2δ. Typical values for δ are 10−5 . . . 10−6, and thus αc is in the range of 0.1 ◦ . . . 0.5◦. For simplicity, ...
PURPOSE The purpose of this study was to characterize inner retinal spots with inverted reflectivity on en face images of swept-source optical coherence tomography (SS-OCT) in diabetic retinopathy (DR). METHODS We retrospectively reviewed seventy-five eyes of 75 patients with DR (15 eyes with individual grades of DR severity). We obtained three-dimensional images (6 × 6 mm) centered on the fo...
We describe the design, construction and performance evaluation of a spectrally resolved reflectance mapping setup. The setup is capable of mapping a full 2 inch diameter semiconductor wafer, with a best spatial resolution of 50μm. The operating wavelength range is from 0.35μm to 1.05μm with spectral resolution of ~1nm. We have used this setup for reflectance mapping studies on distributed Brag...
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