Visible light transmission

Visibihty tints are similar to cosmetic tints except that they are significantly lighter ki kitensity. Visible light transmission losses are typically 1—2%. With these tints, the lens is visible ki the lens package and against a variety of surfaces, and the lens is easier to handle. The tint can be added as cosmetic tints, with a masking technique to produce a clear annulus, or the whole lens can be tinted. 

Figures 3.108 and 3.109 show two measurements of visible light transmission (ASTM D542) of FEP as a function of film thickness. In Fig. 3.108, the light measured is restricted to a narrow beam of roughly 2° and thus excludes most of the scattered light transmitted through the film. Figure 3.109 includes scattered transmitted light up to 180°. This yields a higher value for total light transmitted compared to Fig.

In the case of visible light transmission, this is basically related to an extinction coefficient, or to impairment in visibility. 

Visible light transmission of 5% is sufficient to illuminate a building during daytime. 

Fig. 7.6 (a) A DUV (A = 257 nm) excitation resonance Ramtm image leconstracted from Raman intensity of the adenine and guanine band at 1,490 cm in HeLa cell spectra, (b) A visible light transmission image of the corresponding cell. The scale bar is 10 p,m... 

Cassegrain. The light reflects from the sample, is collected by the upper Cassegrain, and is then focused on the detector. The upper Cassegrain acts as both condenser and objective, and the lower half of the microscope is not involved in this measurement. We have now seen that an infrared microscope can be used in four different ways visible light transmission, visible light reflectance, infrared transmission, and infrared reflectance. The mode that will provide the best viewing and spectra will depend upon the sample. 

The characteristics of those unique polymers are the exceptional transparency with more than 95% of UV and visible light transmission, solubility in a specific solvent, chemical and electrical properties similar to PTFE and the very low refractive index (16). 

UV-visible light transmission spectra were obtained using an HP UV-vis spectrophotometer operated at scan speed 240 nm/min, slit width 2.0 nm, using bottle sidewall polyester parts. 

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