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设计了几种在8～13微米波段与窄带通滤光片和致冷探测器阵列一起使用的、坚固的三元折射物镜。这种设计的性能接近最大理论值,它是用会聚在典型探测器灵敏元边界之内的入射辐射的百分比量度。这种设计还表明采用非球面可在一定程度上改进性能。
Several robust ternary refractive objectives were designed for use with narrow band-pass filters and chilled detector arrays in the 8-13 μm band. The performance of this design approaches the maximum theoretical value, which is measured as a percentage of the incident radiation that converges within the boundaries of the typical detector cell. This design also shows that the use of aspherical surfaces can improve performance to some extent.