A linearization double-group linkage zoom lens was presented based on the 640×512 cooled FPA. This configuration’s zoom groups and compensate groups are moved linear zing, omit zoom cam which control the movement of zoom curve make common double-linkage zoom lens easily. This configuration is similarity to optical compensate zoom has a little image displacement, but it is not influence the image quality when the image displacement control in allow range. This lens was placed at cold shield and 100% cold shield efficiency had reached. Moreover, detailed design and image quality were given by CODE optical software. After analysis, MTF approaches diffraction limit. The results show that this optical system has large zoom ratio, and excellent image quality.
In order to project the laser command information to the proper distance , so a laser zoom projective lens with variable total track optical system is designed in the carrier-based aircraft landing system. By choosing the zoom structure, designing of initial structure with PW solution, correcting and balancing the aberration, a large variable total track with 35~× zoom is carried out. The size of image is invariable that is φ25m, the distance of projective image is variable from 100m to 3500m. Optical reverse design, the spot is less than 8μm, the MTF is near the diffraction limitation, the value of MTF is bigger than 0.4 at 50lp/mm.
In this paper, we put forward a new method to adjust the air gap of the total reflection air gap of the infrared Pechan prism. The adjustment of the air gap in the air gap of the Pechan prism directly affects the parallelism of the optical axis, so as to affect the consistency of the optical axis of the infrared system. The method solves the contradiction between the total reflection and the high transmission of the infrared wave band, and promotes the engineering of the infrared wave band. This paper puts forward the method of adjusting and controlling, which can ensure the full reflection and high penetration of the light, and also can accurately measure the optical axis of the optical axis of the different Pechan prism, and can achieve the precision of the level of the sec. For Pechan prism used in the infrared band image de rotation, make the product to realize miniaturization, lightweight plays an important significance.
To solve real-time image de-rotation problems in infrared search and track (IRST) system design, the paper by adding a set of PECHAN Prism in infrared search and track system achieves image de-rotation. In order to get the image de-rotation prism corresponding with the actual engineering needs, it analyzes the main influential factor of prism and designs a 3~5μm MWIR image de-rotation prism. In order to ensure the performance of the optical system, it uses a new PECHAN Prism parallelism error detection method, which measured that the incident parallelism error is 1′16″. The parallelism error after alignment meets the system requirement. In this paper, the PECHAN Prism image de-rotation method significantly reduces the system’s optical path length to 170.5mm. This method will play an important role in miniaturization, light weight and engineering of product.
A 15× double-group linkage zoom lens was presented based on the 640×512 cooled FPA. Having two alternate components linked and moved together, double-group zoom structure has smoother cam curve, so the displacement of all components are smaller and the total length is shorter. The focal length rang is 30~450mm and wavelength is 3.7~4.8μm, F number is 4. This lens was placed at cold shield and 100% cold shield efficiency had reached. Moreover, detailed design and image quality were given by CODE V® optical software. After analysis, MTF approaches diffraction limit. The results show that this optical system has large zoom ratio, and excellent image quality.
A visible, MWIR, long focal, oblique view and focusing optical system of aerial camera is described, and in this paper we design an innovative optical system with common optical path and catadioptics configuration. The focal length of this optical system is 1.45m in the visible waveband (0.7~0.9μm,) and 0.61m in MWIR waveband (3.7~4.8μm), and the oblique view scanning range is within 20km~100km. To meet the requirements for the sharp imaging quality under the circumstances of high altitude environment and real time variable range, this aerial camera is focused by making back cutoff length longer to add a mirror, then MTF of optical system is all above 0.4 in Nyquest frequency.
According to the requirement of detector, a continuous zooming TV camera with a high resolution and a large zoom ratios used for precision strike was designed. In this paper, basis the selection of continuous zooming optical systems was discussed. Combing with PW method, the incipient structure was computed. Using the CODE V, the optimum design was done. Having analyzed the cam curve of this zooming system, a continuous zooming optical system meeting the technical requirements well was designed, which provided the technical support for the miniaturization of the structure and the stability of the optic axis. This continuous zooming optical system has been checked with image quality testing, real imaging and environment testing and the result showed that the image quality was well, the optic axis was stable and the system meet the requirement of detector well.
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