20 December 2016 Design of a panoramic long-wave infrared athermal system
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Abstract
A panoramic long-wave infrared athermal system is introduced in this paper. The proposed system includes a panoramic annular lens (PAL) block providing a stereo field of view of (30 deg – 100 deg) × 360 deg without the need to move its components. Moreover, to ensure the imaging quality at different temperatures, a refractive/diffractive hybrid lens is introduced to achieve optical passive athermalization. The system operates in a spectral band between 8 and 12    μ m , with a total length of 175 mm and a focal length of 3.4 mm. To get a bright and clear image, the aperture of the system was set to f / 1.15 . The introduction of aspherical surface and even-order diffractive surface not only eliminates the differential thermal but also makes the structure simple and lightweight and improves the image quality. The results show that the modulation transfer function below 20    lp / mm of the system is above 0.2 at each temperature ranging from 20 ° C to + 60 ° C , which is close to the diffraction limit. The system is suitable to be applied in an uncooled infrared focal plane array detector and will serve as a static alert system. It has a number of pixels of 640 × 480 , and the pixel size is 25    μ m .
© 2016 Society of Photo-Optical Instrumentation Engineers (SPIE)
Yuan Yao, Anbing Geng, Jian Bai, Haitao Wang, Jie Guo, Tao Xiong, Yujie Luo, Zhi Huang, Xiyun Hou, "Design of a panoramic long-wave infrared athermal system," Optical Engineering 55(12), 125103 (20 December 2016). https://doi.org/10.1117/1.OE.55.12.125103 . Submission: Received: 9 August 2016; Accepted: 18 November 2016
Received: 9 August 2016; Accepted: 18 November 2016; Published: 20 December 2016
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