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In this work, optical properties from normal and cancerous stroma pairs were measured using reflectance-based confocal microscopy. Our results show that the scattering coefficient of cancerous stroma is significantly lower than that of normal stroma, suggesting that the decreased scattering in cancerous stroma may provide a possible indicator for differentiating normal and cancerous stroma.
An useful design used for the dispersion compensation in Cr:LiSAF femtosecond lasers is reported. It is composed of 58 alternating Ta2O5 and SiO2 layers. The first part, from layer 1 to layer 45, which have quarter-wave optical thickness serve as high reflectivity dielectric stack. The second part, from layer 46 to layer 58, whose thicknesses are obtained by computer optimization provide constant...
The purpose of this paper is to classify 93# and 97# gasoline by using principal component analysis (PCA) with self-organizing competitive neural network method and to establish near infrared transmission spectroscopy and reflectance spectroscopy qualitative identification model in 1100-1700nm spectral region. The spectral data is condensed by PCA method before modeling, and three principal components...
In this paper, a new type of gaussian-shaped metallic nano-grating surface plasma resonance (NGSPR) biosensors and the design optimization process are presented in nano fabrication point of view. The influence of structural factors of nano- corrugations on the sensitivity of NGSPR sensors was investigated using the multiple multipole program (MMP) method. Biosensors with the line width of the gaussion...
The sensing properties with strain and temperature of tapered FBG had been researched both theoretically and experimentally. Based on tapered FBG and thin-wall strain cylinder structure, a novel temperature-independent high pressure sensor was fabricated and investigated. The tapered FBG performed as a chirped grating, whose bandwidth and reflection power broadened and increased when the pressure...
Near infrared diffuse reflectance spectra of 52 tea polyphenol powder samples were collected with FT-NIR spectrometer. The calibration models of total catechins(TC) were established with back-propagation artificial neuron network(BP-ANN) and radical based function artificial neuron network (RBF-ANN) and optimized with prediction sample set. The result showed that the RBF-ANN model is better than the...
Two kinds of sampling methods of optics integrating sphere diffuse reflectance chamber and optical fiber diffuse reflectance probe were employed to collect the near-infrared spectra of 72 fresh lean pork meat samples, respectively. The amount of fat, protein and water in pork meat were determined by the national standard analysis methods as reference. The quantitative analysis models of the above...
Superstructure fiber Bragg gratings constructed following the Fibonacci sequence were designed and fabricated in photosensitive single mode optical fiber by phase mask scanning technique. The reflectivity of the gratings showed the six-cycle property with respect to the Fibonacci sequence order at the central wavelength 1541.86 nm. The reflection spectra were multi-fractal and self-similar with scaling...
An angle-based drought spectral index (ABDI) was proposed aimed to drought monitoring based on Near Infrared (NIR, 858 nm) and Shortwave Infrared (SWIR, 1240 and 1640 nm) bands of the Moderate Resolution Imaging Spectrometer (MODIS). The Shortwave Angle Slope Index (SASI) is reviewed and analyzed. United States Geological Survey (USGS) spectral datasets were employed to validate the ability of ABDI...
Acupoint was the reaction of viscera and its optical parameter was an important characteristic of tissue. In this work, in order to discuss specificity of acupuncture on the response of qi and blood in human body, we compared the diffuse reflectance of Taichong (LV3), Taibai (SP3), and Chongyang (ST42) before, during and after menstruation. All the acupoints had the same shape of the spectrum and...
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