Specifications (Materials Used):
| Flange | Metal | Housing or Cover | Metal Materials |
| Optics | CaF2, BaF2, Germanium | Cover Fixing | Fixed by Magnet nub |
| Water and Dust Ingress | IP67 of NF EN60529 |
Typical Dimensions:
| Models | Body Diameter | Crystals Diameter | Viewing Diameter | Assembly Thickness |
| SHIRW-60 | 84 mm | 60mm | 55mm | 22mm |
| SHIRW-75 | 99 mm | 75mm | 70mm | 22mm |
| SHIRW-100 | 124 mm | 100mm | 95mm | 22mm |
Specifications of Common Materials used in the Infrared Optics:
| Material | Chemical Symbol | Transmission Wavelength (µm) | Reflection (Two Surfaces) | Knoop Hardness |
| Calcium Fluoride | CaF2 | 0.13-10 | 5% | 158 |
| Barium Fluoride | BaF2 | 0.15-12.5 | 7% | 82 |
| Germanium | Ge | 1.8-23 | 53% | 780 |
| Zinc Selenide | ZnSe | 0.5-22 | 29% | 120 |
| Sapphire | Al2O3 | 0.15-5.5 | 14% | 2000 |
| Silicon | Si | 0.14-6 | 29% | 850 |
| IR Polymer | N/A | 0.15-22 | 21% | N/A |
Properties of Materials:
Fluoride crystals (CaF2 and BaF2) were most common used infrared windows materials. They are both hydroscopic, the transmission would be deteriorated for the moisture absorption, but the protective coating on the windows surface is available in Hangzhou Shalom EO to improve its moisture property. CaF2 is good transmission from 0.2-8µm, covers the UV to LWIR range, it is often used at the viewport windows in the electric power switch cabinet. BaF2 is better in transmission (0.3-12µm), it is often used in the petroleum industry applications.
Germanium and ZnSe are among the best broadband infrared transmitters available. The BBAR coated Germanium is good transmission at 1.8-23µm, which covers the MWIR 3-5µm and LWIR 7-14µm range, for the hush environment application, a kind of diamond coating is available to improve its properties. The cost is relatively high for Germanium and ZnSe crystals, they are used in the military and other high demanding applications.
For the MWIR (3-5µm) or middle-wave applications, the sapphire is a good candidate for its good transmission at 0.2-5.5µm wavelength range and the incredible durability (large hardness), the Silicon crystals is also a good alternative for the MDIR applications, it has good transmission at 1.4-6µm and it is lower in cost than the sapphire.
Resources:
Application Notes:
Installation steps:
• Step 1: Calculate and decide the position where the windows would be installed according to the view angle of the thermal imagine camera;
• Step 2: Drill a hole according to the size of the windows assemblies;
• Step 3: Install the whole windows assemblies;
• Step 4: Open the protective cover and make the testing of the inspection.
Select the suitable crystals materials for your applications:
Several factors you should take into consideration during the selection of crystals materials: Wavelength range, environment (temperature, humidity and vibration ect.) and cost. Here is the specification of the materials for your reference.
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