For airborne optoelectronic platform with two axes and four frames, the dynamic model of vibration reduction system is established. Simulation analysis and experimental test for vibration reduction system are made under the condition of stiffness perturbation and barycenter perturbation respectively. Simulation results show that linear vibration accounts for angular disturbance when stiffness perturbation or barycenter perturbation exists. Angular disturbance error is 25μrad and 34.28μrad when barycenter perturbation is 1mm and stiffness perturbation is 1% respectively. Vibration experimental test results show that coupling exists in combination of two kinds of damping system. Angular disturbance coupling of damping system becomes less when stiffness perturbation and barycenter perturbation are reduced. The method provides a new train of thoughts for making a reasonable configuration on stabilized platform damping system.
A method for designing and depositing rectangular wave broadband-pass filter is put forward after a deep study of the nature of the film-filters. A rectangular wave OD3-A broadband-pass filter sample is designed and prepared with this method, with its reference wavelength λ0 =515nm in the working range of 400~1100nm. The average transmittance of the sample in its pass-band of λ0 ±25nm reaches 92.7%, meanwhile the transmittance in the high-reflective bands of λ ≠ λ0 ± 25 nm is less than 0.1%. The transmittance of the thin film sample is tested, and the spectrum meet the requirement. It turned out to be a more advanced technology of designing and depositing rectangular wave broadband-pass filter. Compared with the Fabry-Perot Interferometer narrow-band pass filters’ films which needs optical-controlling method, and the traditional film which combines short and long pass filters making the coatings very thick and with low transmittance in transition zone. it is more economical, have more wide range of transmission and the transmittance is higher in the range of pass-band.
Photon counting lidar is a high-sensitivity laser active imaging method. It can obtain more three-dimensional point cloud data under the same size, weight and power consumption. Through the use of photon counting lidar and image fusion process, the electro-optical system, such as visible light and infrared camera, could generate grayscale images and videos with distance, position and other information of the targets. In this paper, a Fusion Imaging System with Visible Light Camera and Photon Counting Lidar was designed. Visible light image and high-resolution photon counting threedimensional point clouds could be obtained by the system. Fiber array coupled Geiger-APDs were used as the single photon detectors in the system to acquire three-dimensional information with two-dimensional scanner. A CMOS camera was used to acquire gray visible light image in the system. The time-correlated single photon counting (TCSPC) filter algorithm was used to process the single photon points in order to filter the noise signals and extract valid signals. The fusion processing algorithm of the imaging system was designed by using the direct linear transformation algorithm. The performance of the system was verified through experiments. The results show that the three-dimensional imaging range exceeds 1000m under the day light condition. The ranging accuracy of the system is 0.083m. Pixel-level fusion of visible light image and three-dimensional image could be realized at 1024×768 resolution, which effectively improves the detection and recognition capabilities of the system.
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