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Optical glass so that the classification and naming

1.Color naming and classification of optical glass
Grade colored optical glass, and glass is color or use the first letter of the Chinese Phonetic Alphabet to represent the class. Filters were listed in the directory has 20 categories, 120 brands.
According to the spectral characteristics of colored optical glass is divided into three categories.¡£
1.1 As optical glass
Glass is the glass through the naming of a long line to represent the filter, divided into 36 grades of Category 5. For example, through the boundaries of the glass is 490nm, the golden yellow glass, named JB490.
1.2 Selective Absorption Type Glass
Or use the color of the glass sub-14 category, a total of 72 grades. Glass, arranged by serial number, serial number, no special significance.
1.3 Neutral glass
Glass is a combination of the first letter of their Pinyin name, and its serial number is the glass thickness of 2mm, in order to 400nm to 700nm transmittance characteristics mean that, for example, an average of 2mm thick glass transmittance is 70%, then named AB70, a total of 10 brands of such glass, which AB65, AB30, AB5 three grades in the wavelength range is 400nm-660nm.
2. Spectral characteristics
There is not under the shade of the spectral characteristics of glass can be divided into three categories
2.1 As optical glass
Glass spectrum curve shown in Figure 1. They pick through the boundaries of spectral characteristics of indicators to allow deviation of the wavelength ¦Ëtj through the boundaries to provide wavelength transmittance T¦Ë0 and K, to represent the slope of the curve.
Wavelength limit is provided through the thickness of the glass, the guidance provided on the spectral transmittance curve of the wavelength transmittance (T¦Ë0) 50% at the wavelength over a boundary for the appropriate wavelength, and ¦Ëtj said.
Tλ0 that provides wavelength transmittance refers to the spectral curve, the provision of a wavelength corresponding to the transmittance ¦Ë0 is high transmittance curve.

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Spectral slope (K) is the required thickness of glass to ¦Ëtj-20nm wavelength and at a wavelength of ¦Ëtjnm optical density corresponding to the difference between D said.
K = D λtj-20nm- Dλtj
2.2 Selective absorption optical glass
Only through a glass (or absorption) one (or several) in the wavelength range of light, see Figure 2. It is based on the provisions of the spectral characteristics of target thickness of the glass at a specific wavelength ¦Ë, and allow the transmission ratio, said transmission ratio deviation.

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2.3 Neutral type of optical glass
Glass in the visible wavelengths of light in the non-selective uniform absorption, spectral transmittance curve shown in Figure 3, the spectral characteristics of targets based on an average transmittance Tp, the average transmission range than the allowable deviation ¦¤Tp. Maximum allowable deviation Qz to represent.

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Provisions of the average transmittance is thick glass in the wavelength range of the provisions of the glass measured at intervals of 20nm average transmittance to TP said.
Average transmission range than the allowable deviation is the average of the grades of glass transmittance deviation allowed to ¦¤Tp said.
Maximum allowable deviation of glass in the wavelength range provides an average transmittance of the largest transmission ratio deviation and the average absolute difference between the transmission ratio to Qz said.
3.Physical Characteristics
3.1 Index of refraction£¨ND£©
The refractive index of glass is based on the characteristics of sodium measured spectrum D = 5.893.nm to N <sub> D </ sub> said.
3.2 Proportion£¨s£©
Hydrostatic weighing with determination of the proportion of glass .
3.3 Color values£¨x,y,Y£©
According to the International Commission on Illumination (CIE) 1931 and 1964 under way to determine a standard in the A and D65 illumination color values under the glass.
3.4 Thermal Characteristics
3.4.1 Linear expansion coefficient£¨α£©
When the glass temperature rises 1 ¡æ relative change in length. Expansion coefficient of the goals set out in a, far as 20 ¡æ ~ 300 ¡æ temperature range of the average.
3.4.2 Transition temperature£¨Tg£©
Occurred when the glass suddenly change the amount of expansion, the corresponding temperature is the transition temperature of the sample, the temperature near the glass viscosity 1013 Pa. Seconds.
3.43 Softening temperature£¨Ts£©
When the physical properties of glass, dramatic change, its volume expansion close to zero temperature, is the glass softening temperature, then the viscosity of the glass is close to 10''Pa. Seconds.
3.5 Color temperature conversion capability£¨v£©
Rose color temperature and color temperature of glass falling from the two types of color temperature glass composition, its ability to transform dense Rod (mired) A values. Liter glass blue color temperature, grades for the SSB, with a negative density Roeder. Amber glass color temperature drop, the density Rod is positive.
The number is based on the color temperature glass density Bold values arranged. For example SSB130 that rose from the 3200K 5400K, its ability to transform negative 130Mired value rose color temperature glass. SJB130 that fell from the 5400K 3200K, its transformation capacity is 130 Mired in the lower color temperature glass.
4.Chemical Stability
Chemical stability of glass is measured by the water resistance powder method (DW) and acid (DA) expressed in its determination and classification are the light of Japan Optical Glass Industry Association Society of Chemistry Stability of quasi-JOGIS Determination of optical glass (powder method) 06-1975.

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