| 摘要 |
FIELD: physics.SUBSTANCE: device has a radiation source capable of emitting light with initial polarisation, first and second light guides, the first light guide being optically connected to the radiation source for emitting light to the sample. The light guides have corresponding end parts essentially flush with each other, said end parts also being intended to detect radiation reflected from the sample. The device also has a detector which is optically connected to the first and second light guides, the detector being intended for measuring, within the optical subband, indication of the first polarisation of the reflected radiation, second polarisation of the reflected radiation, the second polarisation being different from the first polarisation, and the first and second intensities of the reflected radiation in the first and second light guides, respectively. The detector is operably connected to a processing device which is configured to calculate first and second spectral functions within the optical subband, both spectral functions essentially indicating instances of single scattering in the sample. The first spectral function is a measure of the difference in polarisation between the first polarisation of the reflected radiation and the second polarisation of the reflected radiation, and the second spectral function is a measure of the difference in intensity between the first and second intensities of the reflected radiation. The processing device is additionally meant for calculating the degree of correlation between spectral functions in order to estimate whether there are instances of single scattering from essentially the same optical depth inside the sample. The group of inventions also includes a catheter intended to operate with a connected optical device, and a computer data medium. The latter is meant to enable a computer system, comprising at least one computer, having a connected data storage means, to monitor the optical device disclosed in the present group of inventions.EFFECT: obtaining a reliable signal from an optically thin layer.15 cl, 8 dwg |
