A kind of multi-field of view (multi-FOV) hyperspectral imaging system based on mid-wave infrared (MWIR) has been developed for the first time, to the best of our knowledge. The hyperspectral imaging system is based on two focus length which can be used in different situation. According to the theory of zoom optics and the design method of infrared optics, the front telescope zoom system is calculated and designed, which is coupled with the acousto-optic tunable filter (AOTF) and the focus system to realize the infrared zoom optical system. By developing and optimizing the focus system and the MWIR detector, the +1-order diffracted light and 0-order light of AOTF can be clearly imaged on image plane. So that it can output the MWIR thermogram signal and spectrum signal at the same time. The experimental results show that the system can clearly image the target with 8km away. And the IFOV is up to 0.066mrad. The results pave the way to a novel spectrum detect technology based on infrared zoom optical system.
It is a hybrid design spectrometer with MWIR zooming and spectral imaging. The system realizes the searching in large field of view and recognition in small field of view which can resolve the difficulty that the target and background of spectrometer are not easy to distinguish in a single field of view. It also decreases the difficulty of spectral analysis and data dimension reduction. The collimating light beam modulated by AOTF (acousto-optic tunable filter) provides a basis for the subsequent spectral analysis. The optical system realizes three times zoom from 160mm to 480mm. The simulation achieves the effect imaging result. Experiments show that the system has both imaging and spectral recognition capabilities.
It is a hybrid design spectrometer with MWIR zooming and spectral imaging. The system realizes the searching in large field of view and recognition in small field of view which can resolve the difficulty that the target and background of spectrometer are not easy to distinguish in a single field of view. It also decreases the difficulty of spectral analysis and data dimension reduction. The collimating light beam modulated by AOTF (acousto-optic tunable filter) provides a basis for the subsequent spectral analysis. The optical system realizes three times zoom from 160mm to 480mm. The simulation achieves the effect imaging result. Experiments show that the system has both imaging and spectral recognition capabilities.
It is a hybrid design spectrometer with zooming and spectral imaging. The system realizes the searching in large field of view and recognition in small field of view which can resolve the difficulty that the target and background of spectrometer are not easy to distinguish in a single field of view. It also decreases the difficulty of spectral demixing and data dimension reduction. The new lenses can simultaneously obtain optical imaging and spectral data which provides a basis for the subsequent spectral analysis. The optical system realizes three times zoom from 55mm to 165mm. The simulation achieves the effect imaging result. Experiments show that the system has both imaging and spectral recognition capabilities.
In wavefront coding optical system, with the traditional cubic mask plate (CMP) which owns several extension times of depth of focus (DOF), it is difficult to manufacture. With the symmetrical surface type mask plate which can be machine relatively easily, but it presents small multiples of the extension of DOF. In this paper, it makes a presentation of mask plate design by user defined surface(UDS) type where it has an easy mechanical process and several multiples of extension of DOF. It presents the analytic expression by calculation and its DLL data file which is adapted to ZEMAX. It also performs a simulation experiment based on the three mirror Cassegrain(TMC) wavefront system. The experiment results indicate that instead of the traditional mask plate, the UDS surface mask plate can obtain a larger ratio of extension of DOF and increase the valuable types of mask plate surfaces. What is more, it decreases the surface mechanical difficulty compared to the asymmetrical surface mask plate. The type of UDS surface has the unique design and the convenience manufacturing, which is of great value in both application and research.
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