Zinc Sulphide FLIR (ZnS)

ZnS FLIR is used for IR windows and lenses in the thermal band (8 to 14 μm) as a tough front optic in thermal imaging systems, particularly those subjected to harsh environments.
 
Product Data -----------------------------------------------------
 
Transmission Range : 1.0 to 13 μm
Refractive Index : 2.192 at 10.6 μm
Reflection Loss : 24.6% at 10.6 μm (2 surfaces)
Absorption Coefficient : 0.02 cm-1 at 3.8 μm
Reststrahlen Peak : 30.5 μm
dn/dT : +43 x 10-6/°C at 3.39 μm
dn/dμ = 0 : n/a
Density : 4.08 g/cc
Melting Point : 1827°C (See notes below)
Thermal Conductivity : 16.7 W m-1 K-1 at 296K
Thermal Expansion : 6.6 x 10-6 /°C at 273K
Hardness : Knoop 160 with 50g indenter
Specific Heat Capacity : 469 J Kg-1 K-1
Dielectric Constant : n/a
Youngs Modulus (E) : 74.5 GPa
Shear Modulus (G) : n/a
Bulk Modulus (K) : n/a
Elastic Coefficients : Noy Available
Apparent Elastic Limit : 103.4 MPa (15,000 psi)
Poisson Ratio : 0.29
Solubility : 65 x 10-6 g/100g water
Molecular Weight : 97.43
Class/Structure : Polycrystalline cubic, ZnS, F43m
 
Refractive Index and Optical Transmittance curve----
Refractive Index(No=Ordinary Ray):
µm    No µm    No µm    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
Optical Transmittance Curve of ZnS (Reference Data):
zinc-sulphide-flir-zns Transmittance
 
Special properties of ZnS-----------------------------------

It exhibits high strength and hardness, and good resistance to hostile environments.

It is about one-third harder than Cleartran and about twice as hard as ZnSe.

It does not transmit well in the visible spectral region.

It has the relatively low cost of about two thirds the price of Cleartran or ZnSe.

ZnSe is diamond turnable.

Typeical application:Thermal imaging, FLIR

Products manufactured:Products manufactured: Lenses, Aspheric lenses, Windows, Domes, Wedges

Surface finish:Typical specifications for surface quality in the 3-12μm spectral region are 60-40, 80-50or 120-80 scratch dig depending upon system performance requirements. ZnS regular is diamond turnable.

Surface figure:In the infrared, typical surface figure ranges from 1/2 wave to 2 waves @0.6328 μm depending on the system performance requirements.

AR coating options:Typical available coatings for ZnS include BBAR for the 3 to 5μm and the 8 to 12μm regions. Many other specialized wavelength bands are possible within the 3 to 12μm spectral range.
Product Notes:------------ --------------------------------------

Zinc Sulphide is produced by synthesis from Zinc vapour and H2S gas, forming as sheets on Graphite susceptors. Zinc Sulphide is microcrystalline in structure, the grain size being controlled to produce maximum strength. Forward Looking Infra-Red (FLIR) grade, which is pale yellow and translucent in the visible, is used as deposited without further treatment. It is stronger than multispectral grade. Single crystal ZnS is available, but is not common.

ZnS oxidises significantly at 300°C, exhibits plastic deformation at about 500°C and dissociates about 700°C. For safety, Zinc Sulphide windows should not be used above 250°C in normal atmosphere.

Data provided is extracted from our technical handbook of materials. While every attempt has been made to verify the source of the information, ultiQuest Technology accept no responsibility for accuracy of data

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