|Download Protective IR Windows for Unmanned Aerial Vehicles Datasheet (PDF, 652 KB)|
We offer a series of thin polymer films with high transmissivity in the second infrared atmospheric window, 8 to 13 μm range (see fig. 1), for the purposes where traditional crystalline IR materials, such as germanium, silicon, zinc selenide or sulfide, are economically or technically infeasible. The films are quite transparent in the first atmospheric window as well, but only in a part of the window, namely in the long wave range, 4 to 6.5 μm. Transparency of the films in the visible range is between a few percent and fifty percent, depending on film type (see fig. 2).
Technical characteristics of the films are given in the table below.
|Refractive index in visible range||1,53||1,53||1,53|
|Refractive index in 8-14 μm||1,54||1,54||1,54|
|Refractive index above 15 μm||1,48||1,48||1,48|
|Tensile strength, 10^3 PSI||14…38||60…180||60…180|
|Flexural strength, 10^3 PSI||8…60||100..260||100..260|
|Thermal expansion coefficient, 10^-5/ °C||10…20||11...13||11...13|
|Maximum operating temperature, °C||65||100||100|
|Degradation under sunlight||cracking||none||minor|
|Degradation under weak acids||insignificant||very insignificant||insignificant|
|Degradation under weak alkalis||insignificant||very insignificant||insignificant|
|Degradation under organic solvents||insignificant||insignificant @ Т>60°C||insignificant Т>60°C|
Maximum available film dimensions are 400x250mm.
We also produce windows from IR films of the required sizes, including framed windows per customer’s drawings.
For price quotation and delivery please fill in our request form.