Huang Fuyu, Li Gang, Shi Yunsheng, et al. Design and error analysis of multi-spectral and multi-axis parallelism testing scheme[J]. Opto-Electronic Engineering, 2019, 46(2): 180219. doi: 10.12086/oee.2019.180219
Citation: Huang Fuyu, Li Gang, Shi Yunsheng, et al. Design and error analysis of multi-spectral and multi-axis parallelism testing scheme[J]. Opto-Electronic Engineering, 2019, 46(2): 180219. doi: 10.12086/oee.2019.180219

Design and error analysis of multi-spectral and multi-axis parallelism testing scheme

    Fund Project: Supported by National Natural Science Foundation of China (61801507) and Military Research Projects (012016012600B12506)
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  • The modular design and multi-channel integration has become the main thought of developing the photoelectric equipment, and the multi-axis parallelism directly influences the equipment performance. The current methods cannot meet the actual testing needs of multi-spectral, multi-axis, high-precise and large axis space. Thus a multi-spectral and multi-axis parallelism testing scheme is put forward by adopting the designing thought of reflective type and optical axis translation. The reflective collimator is designed to solve the multi-spectral and multi-axis parallelism testing problems, and the optical axis translation design can increase the axis space of multi-axis parallelism test. The results show that the parallelism testing error is less than 0.134 mrad and the axis space can reach 0.5 m, which can satisfy parallelism testing needs of most photoelectric equipment.
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  • Overview: With the modernization of weapons and equipment, the military photoelectric equipment has been developed from traditional single-spectral and single-axis equipment to integrated photoelectric equipment with multi-spectral and multi-axis structure, which consists of laser ranging, laser guidance, photoelectric reconnaissance, and so on. The optical axis parallelism among multiple detection channels directly determines the precision of the integrated photoelectric equipment, and the target can be effectively located and tracked as long as each optical axis is parallel to each other. Nowadays, the common optical axis parallelism test methods include projection target plate method, laser collimator method, five prism method, large-diameter collimator method, and so on. However, the current methods cannot meet the actual testing needs of multi-spectral, multi-axis, high-precise and large axis space, and thus a parallelism testing scheme is put forward by adopting the designing thought of reflective type and optical axis translation. The proposed multi-spectral and multi-axis parallelism testing scheme is composed of off-axis parabolic reflective collimator, turntable target board, optical-axis translation device and lighting source. Since the transmission structure is different to be used to design the multi-spectral optical system and the problem of center occlusion exists in the coaxial reflective type, the off-axis parabolic reflective collimator is adopted to satisfy the multi-spectral parallelism tests, and the effective aperture and focal length of the designed collimator are 100 mm and 300 mm, respectively. The transmission hole structure is adopted in the design of the frame-type reticle and the cross reticle which can be used in infrared and visible light path, and the sensitive paper is selected to record the optical axis of laser channel. The optical-axis translation device is designed with two pairs of rhombic reflectors which can obtain higher translation precision, and this structure can also meet the test need of large axis space. Then, the axis parallelism tests are carried out aiming at several typical equipment including two visible binoculars, one binocular night vision viewer and one binocular infrared thermal imager. The validity of proposed scheme is proved through testing the above equipment status. Besides, the error analysis of parallelism test is carried out in detail from four aspects, including the collimator collimation error, optical-axis translation error, reticle error and laser axis error. The results show that the parallelism testing error is less than 0.134 mrad, and the axis space can reach 0.5 m, which can satisfy parallelism testing needs of most photoelectric equipment. At last, the performance comparison among the proposed scheme and other schemes is made from five aspects which are spectral region, testing precision, detectable distance, test environment and main shortcomings.

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