Diffuse reflectance spectroscopy with a fiber optic probe is a powerful tool for quantitative tissue characterization and disease diagnosis. Significant systematic errors can arise in the measured reflectance spectra and thus in the derived tissue physiological and morphological parameters due to real-time instrument fluctuations. We demonstrate a novel fiber optic probe with real-time, self-ca...

This paper describes a new methodology for analyzing overprinted stamps. This methodology is based on two procedures. The first performs precise measurements of the dimensions of overprints and a statistical analysis of the minor variations present among them. The second performs a colorimetric analysis of the ink used for printing the overprints. The goal is to determine if these methods can d...

During ODP Leg 138, we tested a prototype instrument, developed at Oregon State University, for measuring light reflectance in 511 channels of the visible and near-infrared bands. The technique of reflectance spectroscopy has been used for some time in chemistry and mineralogy (e.g., Hunt, 1977; Gaffey, 1986) and has found applications in remote sensing of natural reflectance from aircraft and ...

RAMAN SPECTROSCOPY AND DIFFUSE REFLECTANCE SPECTROSCOPY FORDIAGNOSIS OF HUMAN CANCER AND ACANTHOSIS NIGRICANSby SUNEETHA DEVPURAAugust 2012Advisor : Dr. Ratna NaikCo-Advisor : Dr. Steven J. RehseMajor : Physics (Condensed Matter)Degree : Doctor of Philosophy Cancer and diabetes are common chronic diseases in today’s world causingnumerous deaths in adults as well ...

Background: Imaging spectroscopy, the collection of spatially co-registered images in many contiguous spectral bands, has been developed for remote sensing of the Earth utilizing reflectance or luminescence. In this paper we summarize findings on the application of imaging spectroscopy to works of art in order to identify and map artists’ pigments, improve the visualization of preparatory sketc...

BACKGROUND & AIMS The aim of this study was to assess the potential of 3 spectroscopic techniques (fluorescence, reflectance, and light-scattering spectroscopy) individually and in combination, for evaluating low- and high-grade dysplasia in patients with Barrett's esophagus (BE). METHODS Fluorescence spectra at 11 excitation wavelengths and a reflectance spectrum were acquired in approximate...

The impact of target bidirectional reflectance in dual field of view spectroscopy was described and quantified using field measurements and ray-tracing simulations. A data-driven normalization method was developed to convert reflectance factors under cloud obscured conditions into clear sky reflectance by decomposing the target bidirectional reflectance into an isotropic target-specific compone...

We report the detection of a magnetic resonance mode in multiferroic Ba0.6Sr1.4Zn2Fe12O22 using time-domain pump-probe reflectance spectroscopy. Magnetic sublattice precession is coherently excited via picosecond thermal modification of the exchange energy. Importantly, this precession is recorded as a change in reflectance caused by the dynamic magnetoelectric effect. Thus, transient reflectan...