Chinese Color Glass Type
|
Cut-Off Type Glass |
| Ultraviolet Glass |
ZJB220 ZJB240 ZJB260 ZJB280 ZJB300 ZJB320 ZJB340 ZJB360 ZJB380 |
| Golden(Yellow)Glass |
JB400 JB420 JB450 JB470 JB490 JB510 |
| Orange Glass |
CB535 CB550 CB565 CB580 |
| Red Glass |
HB600 HB610 HB630 HB640 HB650 HB670 HB685 HB700 HB720 |
| Infrared Glass |
HWB760 HWB780 HW800 HWB830 HWB850 HWB900 HWB930 |
|
Selective Absorption Type Glass |
| Ultraviolet Glass |
ZWB1 ZWB2 ZWB3 |
| Violet Glass |
ZB1 ZB2 ZB3 |
| Blue Glass |
QB1 QB2 QB3 QB4 QB5 QB9 QB10 QB11 QB12 QB13 QB16 QB17 QB18 QB21 QB23 QB24 QB26 QB29 |
| Green Glass |
LB1 LB2 LB3 LB4 LB6 LB7 LB8 LB9 LB10 LB11 LB12 LB13 LB 14 LB15 LB16 LB17 LB18 LB19 |
| Golden(Yellow)Glass |
JB1 JB9 |
| Orange Glass |
CB1 CB2 |
| Red Glass |
HB1 HB3 HB5 HB6 |
| Infrared Glass |
HWB1 HWB3 HWB4 |
| Protective Glass |
FB1 FB3 |
| Heat-absorbing Glass |
GRB1 GRB3 |
| Multiband Calibration |
PNB586 HOB445 |
| Sky-light Glass |
TB1 TB2 |
| Rising Color Temperature Glass |
SSB40 SSB130 SSB145 SSB165 SSB200 |
| Falling color Temperature Glass |
SJB20 SJB80 SJB100 SJB130 SJB140 |
|
Neutral Type Glass |
| Neutral Grey Colored Glass |
ZAB00 ZAB02 ZAB2 ZAB5 ZAB10 ZAB25 ZAB30 ZAB50 ZAB65 ZAB70 |
Classifications and Names
Based on their spectral transmission characteristic, primarily we divide color glass into 3 categories. And according to the color, optical properties, and the first alphabet of the Chinese pronunciation of the colors, we further divided them into 20 groups and 117 types and named them.
1.Cut-off Color Glass
The glass is named based on spectral characteristic, which is represented by the wavelength transmission limit. For example, if the transmission limit of glass is 490nm,then it is named as JB490.There are altogether 5 groups and 35 types glasses.
2.Absorption-selective Color Glass
This category of glass can be divided into 14 groups and 78 types in this catalogue based on spectral characteristic represented by wavelength transmission.
3.Neutral Color Glass
The glasses in this category are named based on their average transmission on a 2mm thick sample at the wavelength from 400nm to 700nm. For example, if the average transmission is 70%, we name it as ZAB70. Altogether here are 10 types of glass in this category. But the transmission of three types(ZAB65,ZAB30,ZAB5) is tested at the wavelength of 440nm-660nm.
Spectral transmittance characteristic
| 1.Cut-off Color Glass |
|
| The spectral transmittance curve of this kind of glass is as shown in Fig.1. Their spectral characteristic is represented by the limit wavelength of transmission(Lambdatj), the allowable deviation of limit wavelength of transmission, the transmittance(TLambda 0) at a defined wavelength and the slope of transmission curve(K). |
The limit wavelength of transmission(t) refers to the wavelength, at which the transmittance is 50% of the maximum transmittance at the defined wavelength(Lambda 0) when the thickness of the sample glass is defined. We use Lambda tj to represent it.
Lambda0 is the transmittance at a defined wavelength. It is the top transmittance of the transmittance curve.
The slope of transmittance curve is represented by the difference between the light density at Lambdatj and Lambdatj-20nm at a certain glass thickness. That is K = D Lambdatj-20nm - D Lambdatj.
|
2.Absorption-selective Color Glass |
|
| This kind of glass only transmits(or absorbs)light within one or several wavelength ranges as shown in fig.2. Their spectral characteristic is represented by the transmittance of a defined wavelength at a certain glass thickness and the allowable deviation value of transmittance at a certain glass thickness. |
|
3.Neutral Color Glass |
|
| This kind of glass uniformly absorbs all the light at different visible wavelengths. Its transmittance curve is as shown in Fig.3. Their spectral characteristic is represented by the average transmittance(Tp), the allowable deviation of the average transmittance and the maximum allowable deviation Qz. |
The average transmittance is the average of a group of transmittance values measured every 20nm among the defined wavelength range.
The allowable deviation of the average transmittance means the allowable deviation of average transmittance of a certain type of glass. We use Delta Tp to represent it.
The maximum allowable deviation means the absolute difference between the transmittance with the maximum average transmittance deviation and the average transmittance. We use Qz to represent it.
Transmittance of Color Glass
As any other transparent optics materials, color glass also has surface reflectance, which is given by:
Where:
R = Reflectance
no = index of refraction of air
n1 = index of refraction of the color glass, typically 1.51-1.56.
Therefore, R is 0.04 at one surface for a typical color glass in the air. The total reflection loss for two surfaces is approximately 0.08.
Internal transmittance can also be used to determine the transmission at other glass thickness by:
(Tt2)=(Tt1)t2/t1
Where:
Tt1 = Internal transmittance at λfor thickness t1
Tt2 = Internal transmittance at λfor thickness t2 |
