Optical design of multi-spectral optical system for infrared camera

Tianjin Tang

doi:10.1117/12.2191488

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5 August 2015 Optical design of multi-spectral optical system for infrared camera

Tianjin Tang

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Proceedings Volume 9618, 2015 International Conference on Optical Instruments and Technology: Optical Systems and Modern Optoelectronic Instruments; 96180J (2015) https://doi.org/10.1117/12.2191488
Event: International Conference on Optical Instruments and Technology 2015, 2015, Beijing, China

Abstract

This paper studies about the multi-spectral imaging system and describes the design of dual-channel mirror-lens optical system with wide-field for multi-spectral sensor. Combined with the secondary imaging technology, it achieves the one hundred percent cold stop efficiency. Off-axis three-mirror reflective optics is adopted to provide an obstructive field of view and high spatial resolution over the wide-field, which is also shared by two channels. Independent relay lens are employed not only to extract the real exit-pupil matched with the cold shield, but also adjust the multiplication factors for infrared. The dichroic mirror and filters subdivide the wide spectral range into four bands, including mid-wavelength band and long-wavelength band. Each corresponds to respective field. The result shows that the Modulation Transfer Function of each band at respective fields is near the diffraction limit, which satisfies the needs of practical applications. The wavefront of the off-axis three-mirror reflective optics is also satisfactory, which is beneficial to the later alignment and measurement.

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Tianjin Tang "Optical design of multi-spectral optical system for infrared camera", Proc. SPIE 9618, 2015 International Conference on Optical Instruments and Technology: Optical Systems and Modern Optoelectronic Instruments, 96180J (5 August 2015); https://doi.org/10.1117/12.2191488

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