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ZnS FLIR(前视红外)用于红外窗口和热波段(8至14μm)透镜,作为热成像系统(特别是那些遭受恶劣环境)的坚韧的前光学器件。 ZnS FLIR等级比ZnS多光谱等级具有更高的强度。硫化锌通过从锌蒸汽和H 2 S气体合成而产生,经过压片形成片状。 硫化锌在结构上是微晶的,控制晶粒尺寸以产生zui大强度。
前瞻性的红外(FLIR)级,其在可见光中是淡黄色和半透明的,在没有进一步处理的情况下使用沉积。 它比多光谱级别更强。 单晶ZnS是可用的,但不常见。在其常用光谱范围内, 散射很低。在用做高功率激光器件时, 需要严格控制材料的体吸收和内部结构缺陷, 并采用极小破坏程度的抛光技术和高光学质量的镀膜工艺。
ZnS在300℃下显著氧化,在约500℃下显示塑性变形,并解离约700℃。 为了安全起见,在正常大气中不应在250°C以上使用硫化锌窗户。
透射范围: |
1.0~13μm |
折射率: |
2.192 at
10.6μm |
反射损耗: |
24.6% at 10.6μm(2个表面) |
吸收系数: |
0.02cm -1
at 3.8μm |
吸收峰: |
30.5μm |
dn / dT: |
+ 43×10 -6
/℃,3.39μm |
dn /dμ= 0: |
n / a |
密度: |
4.08g /
cc |
熔点: |
1827°C(见下面注释) |
热导率: |
16.7Wm-1K-1
at 29.7K |
热膨胀: |
6.6×10-6
/℃ at 273K |
硬度: |
Knoop
240 with 50g indenter |
比热容: |
469JKg-1K-1 |
介电常数: |
n / a |
杨氏模量(E): |
74.5GPa |
剪切模量(G): |
n / a |
体积模量(K): |
n / a |
弹性系数: |
Noy available |
表观弹性极限: |
103.4 MPa(15,000 psi) |
泊松比: |
0.29 |
溶解度: |
65×10-6g
/ 100g water |
分子量: |
97.43 |
类别/结构: |
多晶立方,ZnS,F43m |
光谱透射曲线:
折射率:(No = Ordinary Ray)
um |
No |
um |
No |
um |
No |
0.42 |
2.516 |
0.46 |
2.458 |
0.50 |
2.419 |
0.54 |
2.391 |
0.58 |
2.371 |
0.62 |
2.355 |
0.66 |
2.342 |
0.70 |
2.332 |
0.74 |
2.323 |
0.78 |
2.316 |
0.82 |
2.31 |
0.86 |
2.305 |
0.90 |
2.301 |
0.94 |
2.297 |
0.98 |
2.294 |
1.00 |
2.292 |
1.40 |
2.275 |
1.80 |
2.267 |
2.20 |
2.263 |
2.60 |
2.26 |
3.00 |
2.257 |
3.40 |
2.255 |
3.80 |
2.253 |
4.20 |
2.251 |
4.60 |
2.248 |
5.00 |
2.246 |
5.40 |
2.244 |
5.80 |
2.241 |
6.20 |
2.238 |
6.60 |
2.235 |
7.00 |
2.232 |
7.40 |
2.228 |
7.80 |
2.225 |
8.20 |
2.221 |
8.60 |
2.217 |
9.00 |
2.212 |
9.40 |
2.208 |
9.80 |
2.203 |
10.2 |
2.198 |
10.6 |
2.192 |
11.0 |
2.186 |
11.4 |
2.18 |
11.8 |
2.173 |
12.2 |
2.167 |
12.6 |
2.159 |
13.0 |
2.152 |
13.4 |
2.143 |
13.8 |
2.135 |
14.2 |
2.126 |
14.6 |
2.116 |
15.0 |
2.106 |
15.4 |
2.095 |
15.8 |
2.084 |
16.2 |
2.072 |
16.6 |
2.059 |
17.0 |
2.045 |
17.4 |
2.03 |
17.8 |
2.015 |
18.2 |
1.998 |
|
|
ZnS FLIR圆形窗片:
订购型号 |
规格(D×L) |
应用光谱 |
Grade |
ZNSFP9.5-2 |
9.5×2.0mm |
IR |
FLIR Grade |
ZNSFP19-1W |
19.0×1.0mm 楔形 |
IR |
FLIR Grade |
ZNSFP25-2 |
25.0×2.0mm |
IR |
FLIR Grade |
ZNSFP25-4 |
25.0×4.0mm |
IR |
FLIR Grade |
ZNSFP25.4-5 |
25.5×5.0mm |
IR |
FLIR Grade |
ZnS FLIR矩形窗片:
规格(L×W×H) |
应用光谱 |
Grade |
25.0×25.0×5.0mm |
IR |
FLIR Grade |
During Chemical Vapour Deposition the small crystallite grains align with the direction of growth, and are normal to the thickness of the sheet produced. For windows of normal thickness and aspect ratios the alignment of the grain therefore is rarely a problem as they are cut from the grown sheet such that within an optical window the grains align perpendicular to the surfaces. This is optimum orientation for lowest internal absorption and scatter.
With prisms, the cutting direction requires more consideration. It is recommended that the thickness of the strip material corresponds to the apex height of the prism. This ensures optimum crystallite orientation for most usual prism applications.
For typical 45° prisms the most obvious use of material is shown in (A) but it should be noted that this is not the optimum orientation.
The best choice is (B) and it also permits a higher limit on prism size or conversely allows thinner stock to be used. There is waste at the ends of the strip but this is small and so it may not be quite as economic as (A).
Cutting in direction (C) where the entire light beam runs at 90° to the grain
structure
should be avoided completely if at all possible. Note that maximum available
thickness of ZnSe and ZnS (FLIR) is approximately 60mm. Maximum available thickness
of ZnS Cleartran is approximately 30mm.