Spectral transmittance of quartz sight glass
The spectral transmittance of quartz sight glass is influenced by three factors: reflection, scattering and absorption. The reflection of the quartz sight glass is generally 8%, the ultraviolet region is larger, the infrared region is smaller. Therefore, the transmission rate of quartz sight glass is generally not more than 92%. The scattering of quartz sight glass is relatively small, and it is generally negligible. There is a close relationship between impurity content and spectral absorption and production process of quartz sight glass; through rate of less than 200 nm band, how many metal impurity content; 240 nm absorption number of hypoxia structure; visible absorption is due to transition metal ions caused by the presence of the 2730 nm absorption is the absorption peak of medium, can be used to calculate the matrix content.
Calculated by spectral absorption group:
The calculation formula of A and GE: C=910/T * LOG10 (Ta/Tb) mm-1
C: base content (C, PPM)
T: thickness (mm)
The transmittance of Ta:2600 nanometer wavelength
The transmittance of Tb:2730 nanometer wavelength
B, the calculation formula: C=96.5/d * LG10 (Ia/I) mm-1
C: base content (PPM)
D: thickness (CM)
Ia:2730 nanometer baseline to zero line distance (mm)
I:2730 nanometer absorption peak to zero line distance (mm)
Raw materials and manufacturing have little effect on the refractive index and dispersion rate. The base content is 0.001% (weight), that is, 1*10-5, refraction
The rate is about 1*10-6. If the water content is from zero to the large water content of the synthetic quartz sight glass, the refractive index will change with the 140*10-6.

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