typical glass transmittance

Figure 3.11. One can further split the reflectivity ρ∞ into interface-only and bulk property components. Note the change in response between 738 and 742 cm−1, which can be used to discriminate between the pressure and temperature effects. Wide FOV sensors, such as the AVHRR, can show considerable scan-angle effects due to changes in the atmospheric path in the cross-scan direction. Depending on the wavelength (λΤ) at which transition from high transmittance to high reflectance occurs (e.g., when τ ≈ 50% and ρ ≈ 50%), we can distinguish two broad categories of low-e coatings: (1) those intended for solar control, with λΤ ≈ 0.7 μm, which reject the solar IR spectrum and (2) those intended for thermal insulation, with λΤ ≈ 2 μm, which transmit the solar IR. It is, however, possible to further increase the transmittance by applying an optically thin film. Real atmospheres with a full range of molecular, aerosol, and particulate sizes exhibit a combination of Rayleigh and Mie scattering. With the advances that have been made in window technology, you can now get the best of both worlds in terms of visibility and energy efficiency. 0000035602 00000 n 9 0 obj CECxxxQ: ITO-coated quartz glass (double side polished) View angle is defined as the angle from nadir. of glass in providing daylight and a clear view through the window. The foregoing discussion shows that increasing bext (aerosol concentration) for a scattering aerosol in almost all situations causes Ct to decrease. However, there are other factors such as the frame, sash and grids. 0000008548 00000 n The magnitude of scattered light is approximated by pure Rayleigh scattering with a λ−4 dependence on wavelength. ... Transmittance of silica glass and the optical glass SF6 with a large content of lead oxide as a function of wavelength. It ranges from 0 to 1 and refers to the solar energy transmittance of a window or door as a whole, factoring in the glass, frame material, sash (if present), divided lite bars (if present) and screens (if present). Installing new windows or replacing old ones is a big investment for any homeowner. 2-4 and Fig. Fig. The former are suitable for warm climates, the latter being suitable for cold climates in which solar gains are desirable. Chabot College Community and Student Services Center. Both of these images are contrast enhanced. G. Leftheriotis, P. Yianoulis, in Comprehensive Renewable Energy, 2012. Usually the transmittance range spreads also into the near UV and IR regions.As a general trend lowest refractive index glasses show high transmittance far down to short wavelengths in the UV. 0000016650 00000 n 0000000016 00000 n Changes in Nr* are primarily responsible for changes in Mtf,a as aerosol is added or subtracted from a clean atmosphere. spectrum. example, tinted glass has a lower visible transmittance than clear 0000007884 00000 n g���� �@&ف����8��5ll�8����Ta6�����hu����㰘�G���_�i���-t��y��2��-�U��.�����~]�e?���iL�3~�.�n�6�t��Y�=�>���M~�����b Atmospheric view path and vegetation canopy radiance variation with view angle are the rationale for the MISR sensor that records images from nine cameras in four spectral bands at different in-track view angles (Plate 2-2). 0000003653 00000 n On your search for replacement windows, remember to keep in mind all the ratings that go into deeming a window energy efficient. Dielectric stacks made of alternating high- and low-refractive index layers with quarter-wave optical thickness can be tailored to provide reflectances and transmittances with large diattenuation. The unit length vector s points to the sun and the unit length vector n(x, y) is normal to the surface. The molecular absorption bands of water and carbon dioxide cause “deep” absorption features that, in two bands near 1.4 μm and 1.9 μm, completely block transmission of radiation. This is the transmittance along the solar path, i.e., between the sun and the earth's surface, for a solar elevation angle of 45°. h�bbZ�����8�f�;��1�G�c4>F�h|���`� � endstream endobj 847 0 obj <>/Metadata 187 0 R/Names 848 0 R/OCProperties<>/OCGs[849 0 R 850 0 R 851 0 R 852 0 R]>>/Outlines 160 0 R/PageLayout/SinglePage/Pages 186 0 R/StructTreeRoot 189 0 R/Type/Catalog/ViewerPreferences<>>> endobj 848 0 obj <> endobj 849 0 obj <> endobj 850 0 obj <> endobj 851 0 obj <> endobj 852 0 obj <> endobj 853 0 obj [/View/Design] endobj 854 0 obj <>>> endobj 855 0 obj [856 0 R] endobj 856 0 obj [852 0 R 851 0 R 850 0 R 849 0 R] endobj 857 0 obj >/PageWidthList<0 595.276>>>>>>/Resources<>/ExtGState<>/Font<>/ProcSet[/PDF/Text]/Properties<>/XObject<>>>/Rotate 0/StructParents 0/Tabs/S/Thumb 176 0 R/TrimBox[0.0 0.0 595.276 793.701]/Type/Page>> endobj 858 0 obj [859 0 R 860 0 R 861 0 R 862 0 R 863 0 R] endobj 859 0 obj <>/Border[0 0 0]/H/N/OC 852 0 R/Rect[383.512 133.528 409.244 110.328]/Subtype/Link/Type/Annot>> endobj 860 0 obj <>/Border[0 0 0]/H/N/OC 852 0 R/Rect[311.811 636.758 540.811 625.958]/StructParent 15/Subtype/Link/Type/Annot>> endobj 861 0 obj <>/Border[0 0 0]/H/N/OC 852 0 R/Rect[311.811 617.558 540.811 606.758]/StructParent 16/Subtype/Link/Type/Annot>> endobj 862 0 obj <>/Border[0 0 0]/H/N/OC 852 0 R/Rect[311.811 598.358 540.811 587.558]/StructParent 17/Subtype/Link/Type/Annot>> endobj 863 0 obj <>/Border[0 0 0]/H/N/OC 852 0 R/Rect[311.811 579.158 540.811 568.358]/StructParent 18/Subtype/Link/Type/Annot>> endobj 864 0 obj <>stream

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