As an important branch of lidar technology, laser 3D imaging technology can be used to detect the outside of the target features, and in the military vehicles, aircraft to be practical application, has been the world’s military attention and recognized. Laser 3D imaging can detect and display the information such as the appearance and outline of the target object, and can be combined with image processing technology, GPS technology, and pattern recognition technology, to finally realize the position and external details of the target object. Compared with the traditional two-dimensional remote sensing and image photography technology, it can more truly and carefully reflect the characteristics of the target object, so the three-dimensional imaging lidar technology has great development prospects. This paper introduces the principle of 3D imaging lidar, working system and the key technology in the development process, and analyzed the development trend and characteristics of 3D imaging lidar, comparing the application of 3D imaging lidar technology at home and abroad, and finally puts forward the development trend of 3D imaging lidar on the airborne platform.
In response to the existing test requirements for airborne optoelectronic products, a long-wavelength band (7.5μm ~ 12.0μm) dynamic dual-target simulator was developed. Compared with previous dynamic scene projection equipment. The dynamic dual target simulator realizes the simulation of moving targets by moving target plates of different shapes and sizes at the rear focal plane of the collimating optical system. The two targets are respectively located on the conjugate focal plane of the collimating optical system, and the coupling of the two targets is realized through the beam combiner. The beam combiner can respectively transmit and reflect two infrared targets, so that the two infrared target beams can be efficiently combined into one infrared beam, while ensuring that no ghost images are generated.
In the infrared detection sensitivity test of optoelectronic products, the black body mostly adopts a single black body structure, and the ambient temperature is obtained by the temperature sensor of the black body close to the aperture aperture, not the aperture aperture to simulate the background temperature. Under the condition of large temperature difference, the black body irradiates the back of the aperture aperture for a long time, which will cause the surface temperature of the aperture aperture to rise and introduce large errors. The infrared detection sensitivity test system based on double black body adopts target black body and background black body to achieve accurate simulation of target and background temperature respectively. The target black body is transmitted through the aperture aperture to complete the target radiation simulation, and the background black body is reflected through the aperture aperture to complete the background radiation simulation. The designed infrared detection sensitivity test system has an optical aperture of Θ500mm, a focal length of 4000mm, a temperature adjustment accuracy of 0.01°C, a field of view of 2°, and an exit radiation uniformity better than 90%. It adopts environmental adaptation design to ensure that it can work under a wide temperature range of -55° ~ 70°, which effectively expands the test range of infrared detection sensitivity testing.
KEYWORDS: Video, Infrared imaging, Signal detection, Signal processing, Video processing, Infrared search and track, Infrared detectors, Imaging systems, Target detection
As a passive detection system, the infrared search and tracking (IRST) system is widely used in the search and tracking of high-speed targets. In order to ensure stable tracking of high-speed targets, the infrared search and tracking system has a high image frame rate, and even through the window function of the infrared detector, the image output frame rate can reach hundreds or even thousands of Hz. At the same time, in order to facilitate visual observation, the detection system should also have an analog video display function, and the common analog video frame rate is generally 25 Hz or 30 Hz. Therefore, it is necessary to realize the analog video display of high frame rate video stream through frame rate conversion. Aiming at the above problems, an adaptive frame rate conversion method is proposed and implemented on the infrared imaging hardware platform of the detection system. The experimental results show that the adaptive characteristics of the method have good versatility, and the frame rate conversion can be easily and stably realized.
Aiming at the current testing requirements of optoelectronic products, a long-wave infrared dynamic dual-target simulation system is designed.The optical design of the system adopted a transmissive structure, the dual targets were located on the conjugate focal plane of the optical path, and the dynamic dual targets were realized by a beam combiner.The two-dimensional transportation of the goal was achieved by electric devices.Compared with the static target simulation system, the dual targets could move independently to realize different acceleration and speed curve simulations. In the field of view, the motion curve can be programmed to achieve, and the target position information could be output in real time.The final realization of parallelism was better than 20″, the field of view was 4°, the exit pupil diameter was Φ160mm, the exit pupil distance was 1100mm, the focal length was 800mm, the dynamic target movement speed was 0.02°/s~3°/s, and the acceleration was 0.02°/ s 2~3° /s2 .After a number of product trials, the simulation system meets the current demand for optoelectronic products testing.
At present, airborne optoelectronic products mostly use multi-sensors (visible light, infrared, laser, etc.) to coordinate the detection, recognition and tracking of threatened targets. Therefore, higher requirements are placed on the optical axis consistency of multi-sensors.In response to this demand, the visible light, laser and infrared astigmatism axis detection equipment suitable for a wide temperature range (-55°C~+70°C) are designed.The collimating optical system of the optical axis detection device adopts a common aperture design, and uses an off-axis parabolic mirror to achieve collimation of the light beam.For a wide temperature environment, the optical system adopts passive athermal design.Compared with the previous independent radiation sources, the multi-band composite radiation source is used to integrate infrared, visible and laser radiation sources, saving space, simplifying the operation steps and reducing the difficulty of use.The optical axis detection equipment needs to be used in the temperature box. Compared with the previous manual operation of the temperature box, this solution uses electric means to realize the optical axis measurement, which greatly improves the use efficiency and reduces the risk of personal injury.The optical axis detection equipment designed finally can control the collimation optical system parallel difference within 10″under wide temperature range and within 6″ under 20°C.
The current semi-physical simulation testing of optoelectronic products requires the simulator to meet the requirements of full band, high accuracy and portability.In response to this demand,a full-band target simulator that can be used on a five-axis turntable was designed.The collimating optical system of the target simulator adopted off-axis reflective structure design, and the radiation simulation source adopted infrared and visible light composite radiation sources; the infrared radiation source and the visible light radiation source adopted the coaxial mode, the structure was compact, and the temperature control accuracy can reach 0.1°C.In order to ensure the imaging quality of optical products, this paper designed the target simulator with exit pupil diameter Φ200mm, exit pupil distance 700mm, parallel difference 8.5", transmittance 0.8@632.8nm. Targeted on different test requirements,designed a variety of shapes such as point hole, four bar, cross and multi-target.Aiming at the problem that the optical axis of the infrared and visible light sensors of the tested photoelectric product is not at the center of rotation of the five-axis turntable, physical translation is used to achieve the connection between the target simulator and the pupil of the sensor optical system of the tested photoelectric product.The target simulator was put into use as soon as the design was completed. After using a variety of optoelectronic products, the feedback was good and met the design requirements.
Under the background of the test equipment adopting the generalized platform hardware environment, an automatic test system design implementation method is proposed, which will divide the test resource information into test elements such as device library, ICD library, use case library, etc., and refer to the test standard to describe the characteristics and test elements of the language ATML. Classify test case descriptions as standard incentive response commands and use common test software to complete the automated testing process. The automatic test system integrates key test elements such as test data, test strategy and requirements, test steps, test results management, and provides the overall system structure resources, test description, test results, configuration information, public information, etc., and solves a series of problems brought about by manual detection and maintenance.
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