Although, cloud has a large influence on the magnitude of the biologically damaging UV for cataracts, the influence of cloud on the short wavelength cut-off for the biologically damaging UV for cataracts is less than the influence of the solar zenith angle.
#Cut off wavelength spectroscopy free#
Similarly, for the cloud free cases, the short wavelength cut-off ranged by 9 nm for the same SZA range. For the all sky conditions, the short wavelength cut-off ranged by 12 nm for the SZA range of 5 to 80 degrees and the maximum in the spectral UVBD ranged by 15 nm. The cut-off wavelength (lambdac) was defined as the wavelength at which the biologically damaging spectral irradiance was 0.1% of the maximum biologically damaging irradiance for that scan. The UV spectra were obtained on an unshaded plane at a latitude of 29.5 degrees S. The spectral biologically damaging UV for cataracts on a horizontal plane was calculated by weighting the spectral UV measured with a spectroradiometer with the action spectrum for the induction of cataracts in a porcine lens. This research aims to investigate the influence of cloud and SZA on the short wavelength cut-off of the spectral UVBD for cataracts. The mode field can only have a Gaussian intensity distribution and rotational symmetry at wavelengths above co. However, the effect on the short wavelength cut-off due to SZA and due to clouds has not been investigated for biologically damaging UV for cataracts. The cut-off wavelength co is defined as the shortest wavelength for which the fiber is single-mode. Cloud and solar zenith angle (SZA) are two major factors that influence the magnitude of the biologically damaging UV (UVBD) irradiances for humans. Table 1 Specification of Cut-off Wavelength of dispersion un-shifted single mode optical fiber3,4,5,6 Standard Cable Cut-off Wavelength Fiber Cut-off Wavelength l CC) (l Cf) (ITU-T G.652.A, B (03-03) Maximum 1260 nm Not Specified ITU-T G.652.