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Chemical properties of quartz glass

2019-10-25 14:11:22 feilihua 3

The optical properties of the quartz glass

Quartz glass is transparent ultraviolet, visible, near-infrared properties of the best glass, you can choose the required varieties 168nm-3500nm wavelength range from as needed.

 

Optical quartz glass grades

NameTrademarkCorrespondence
Trademark
Feature
Far ultraviolet quartz glassZS-1JGS1Transparent in the ultraviolet and visible spectral range; in the 185-250nm wavelength range without absorption band; in 2600-2800nm has a strong absorption band wavelength range; non-emitting light radiation stability.
Ultraviolet quartz glassZS-2JGS2Transparent in the ultraviolet and visible spectral range; in the 200-250nm wavelength range without absorption band; in 2600-2800nm has a strong absorption band wavelength range; non-emitting light radiation stability.
Infrared optical quartz glassHSJGS3In the visible and infrared spectral range and transparent; within 2600-2800nm wavelength range without significant absorption band;

 

And compared to ordinary silicate glass, transparent quartz glass in the entire wavelength head through excellent performance. In the infrared region of the spectrum than normal through the large glass; in the visible region, the transmittance of the silica glass is relatively high. In the UV spectral region, especially in the short ultraviolet region, spectrum through better than other glass.
Spectral transmittance by three factors: the reflection, scattering and absorption. Reflective quartz glass is generally 8%, a large number of ultraviolet region, the infrared region smaller. Therefore, the transmittance of the quartz glass is generally not more than 92%. Quartz glass scattering is relatively small, generally can be ignored. Spectral absorption and impurity content and production processes quartz glass has a close relationship; sodium below 200 meter transmission segment level, representing the number of metal impurities; 240 nanometer absorption indicates how many hypoxia structure; visible absorption band is due to the presence of a transition metal ion caused by the absorption of 2730 nanometers is hydroxyl absorption peak, may be used to calculate the hydroxyl content. 

 

By hydroxy calculated spectral absorption method:
A GE's formula: C = 910 / T * LOG10 (Ta / Tb) mm-1

C: hydroxyl group content (C, ppm)
T: Thickness (mm)
Ta: 2600 sodium meter-long transmission
Tb: 2730 sodium meter-long transmission
B: China's national standard formula: C = 96.5 / d * LG10 (Ia / I) mm-1
C: hydroxyl content (ppm)
d: thickness (cm)
Ia: distance from the zero line to line 2730 Mickey sodium (mm)
I: 2730 nanometer absorption distance to the zero line (mm)

Spectral transmittance: thickness (1mm)
Other thicknesses spectral transmittance can be used to derive the formula: T = (1-R) 2 e -at

T: transmittance
R: Single reflection loss.
e: natural logarithm base.
t: thickness (cm)

 

WavelengthTransmission %
nm     Synthetic quartz glass  Gas refining quartz glassInfrared quartz glass
17050100
18080503
19084658
200877020
220908060
240918265
260928680
280929090
300929191
320929292
340929292
360929292
380929292
400-2000929292
2500858792
2730103090
3000808090
3500757588
4000555573
4500152535
500071530


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