In view of its potential for caries diagnostics,
fluorescence spectroscopy in optical range has been the object of
research for the last years. In the frames of this work the
comparative investigations in this direction were accomplished
with the help of fibre optics spectrometer and lasers at the
wavelengths of 473 nm, 532 nm, and 633 nm. Together with
spectroscopic investigations, the element analysis of enamel (of
sound teeth and teeth with caries lesions) was fulfilled with the
help of laser mass-spectrometer.
Abstract:In view of its potential for dental diagnostics, noninvasive optical methods have been the object of research for the last years. Different techniques (spectroscopy, microscopy, and tomography) are used to discriminate between caries and sound enamel. The main aim of this paper is to determine a simple way to see incipient caries with the naked eye. Relative parties R of fluorescence intensities from the sound enamel (squares) and white spots (rings) as a function of excitation wavelength λexc
The purpose of this work is to measure the ozone vertical distribution (OVD) in the upper troposphere–stratosphere by differential absorption lidar (DIAL) at 299/341 nm and 308/353 nm and to compare and analyze the results against satellite data. А lidar complex for measuring the OVD in the altitude range ≈(5–45) km has been created. Here we analyze the results of ozone lidar measurements at wavelengths of 299/341 nm and 308/353 nm in 2018 at Siberian Lidar Station (SLS) and compare them with satellite (MLS/Aura and IASI/MetOp) measurements of OVD. The retrieved lidar OVD profiles in the upper troposphere–stratosphere in comparison with MLS/Aura and IASI/MetOp profiles, as well as the stitched OVD profile in comparison with the mid-latitude Krueger model, confirm the prospects of using the pairs of ozone sounding wavelengths 299/341 and 308/353 nm.
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