IR molded optics for thermal imaging
IR molded optics for thermal imaging
复制标题
DOI：
10.1117/12.486072
复制
发表时间：
2003-09
期刊：
影响因子：
--
通讯作者：
Y. Guimond;Y. Bellec
中科院分区：
文献类型：
--
作者：
Y. Guimond;Y. Bellec
优美科IR玻璃是一家专业生产硫系玻璃和模压光学元件的公司。标准玻璃成分为GASIR1(Ge22As20Se58)和GASIR2(Ge20Sb15Se65)。这些材料在3-5μm和8-12μm波段是透明的。已经开发了一种工业工艺来生产这两种性能可控的玻璃。例如，在10μm时，折射率的重现性优于1.5x10-4。一种独特的高精度模压技术已经开发出来，以生产具有高性能水平的低成本硫系玻璃透镜。球面、非球面和非球面衍射镜的制造具有非常精确的表面精度。模压表面的形状缺陷可以小于0.3μm，典型的粗糙度为10 nm。当在模制镜片上沉积减反射膜时，反射损失减少，透过率提高到98%，而未镀膜镜片的透过率为70%。一种耐用的涂层也已经被开发出来，作为对暴露的镜片的保护。用于红外相机的镀膜非球面-衍射型Gasir光学元件可提供高质量的图像。其性能与使用非球面锗的光学系统相当。GASIR为热成像提供了一种高性价比的锗替代品，尤其适用于中到大容量的商业和军事应用。
Umicore IR Glass is a company specialising in the production of chalcogenide glasses and moulded optics. The standard glass compositions are GASIR1 (Ge22As20Se58) and GASIR2 (Ge20Sb15Se65). These materials are transparent in the 3-5 μm and 8-12 μm bands. An industrial process has been developed to produce these two glasses with well controlled properties. The reproducibility of refractive index is for example better than 1.5 x 10-4 at 10 μm. A unique and high precision moulding technology has been developed to produce low cost chalcogenide glass lenses with high performance levels. Spherical, aspherical and asphero-diffractive lenses are manufactured with very accurate surface precision. The form defect of the moulded surfaces can be less than 0.3 μm with a typical roughness of 10 nm. When depositing an antireflection coating onto the moulded lenses, the reflection losses are reduced, raising the transmission to 98%, compared to 70% for uncoated lenses. A durable coating has also been developed as a protection for exposed lenses. Coated asphero-diffractive GASIR optics, used in infrared cameras give good quality images. The performance is comparable to that of an optical system with aspherical germanium. GASIR offers a cost-effective alternative to germanium for thermal imaging, especially for medium to high volume applications, both commercial and military.