Laser active suppressing jamming is one of the most effective technologies to cope with optoelectronic imaging system. Multiple horizontal crosstalk lines have been observed with the increase of incident laser power on the optoelectric detector, when we carried out the test of supercontinuum laser jamming optoelectronic imaging system. When the laser incident power reached 5mW, there was a longitudinal crosstalk line passing through the center of the main laser spot in the output image. The width of the longitudinal crosstalk line increased with the increase of incident power and it gradually covered the main spot. Multiple horizontal crosstalk lines faintly appeared in the output image when the incident power increased to 200mW. We continued to increase the incident power to reach 500mW and the multiple horizontal crosstalk lines cover the entire output image. We analyzed the generation mechanism of multiple crosstalk lines based on the working principle of photodetectors and have found that the photo-generated charges sharply increased during the integration time of the detector when the power of incident laser is very high. Overflow charges exceeding full well capacity quickly filled the entire column of vertical transfer CCD, secondly overflowed to the horizontal transfer CCD, and lastly filled the entire row of horizontal transfer CCD. The research results can provide the theoretical reference and data support for the research on laser active suppressing interference technology
Infrared imaging systems have many advantages, such as full-time employment, good concealment, high resolution, strong anti-interference ability, so they have become the military and civilian focus so far. In this paper, we explored to construct the evaluation system about detection performance of infrared imaging systems based on infrared physics theory and the action mechanism between infrared radiation and detector. First of all, infrared detection mechanism of point target has been investigated under long distance condition. We derived the solving formula of detection range and proposed the method of calculating the mutual position of target and detection system to reduce false alarm rate. Secondly, we constructed the evaluation system on detection performance of area target, and mainly combined the area distribution of target imaging on the photodetector, signal to noise ratio of target, the contrast between target and background. The detection range of area target was the minimum value of the three factors. The simulation results indicated that the constructed evaluation system of point target and area target can fully evaluate detection performance of infrared imaging systems.
Controlled nuclear fusion through laser Inertial Confinement Fusion (ICF) is currently being developed. It is of great significance for energy security, high energy physics and national defense, etc. High-precision x-ray microscopic imaging techniques have become the key to revealing material phenomena and laws under extreme conditions. This paper proposes an open-type Wolter microscope configuration. By utilizing the configuration, a number of modern polishing techniques can be utilized and a balance between imaging performance and the feasibility of optical processing can be achieved. The original enclosed and inner Wolter mirror surfaces have been changed to unclosed outer surfaces. The configuration is characterized by high spatial resolution, large depth of field, and high throughput, among other features. And these characteristics are urgently needed in high-precision x-ray imaging diagnostics. The technical scheme and optical considerations of the configuration are detailed. Ray tracing simulation is used to design key optical parameters and evaluate system imaging performance. In addition, this configuration has potential for various diagnostic purposes, including sub-micron spatial resolution imaging, high-energy high-throughput imaging, multi-color and multi-channel imaging, and more.
High power laser transmission in optical system is a key link for laser coping with electro-optical imaging system. When laser goes through the entrance pupil of optical system, diffraction effect inevitably comes into being due to the limitation of the entrance pupil. The energy distribution on the photodetector caused by diffraction effect can have a serious impact on the target detection and recognition. The correction method of diffraction effect among the different optical systems has been proposed based on Fraunhofer diffraction theory in this paper. The simulations results have indicated that diffraction effect simulated by the oscillation envelope approximation have a good agreement with the results simulated by Bessel function on energy distribution profile and changing trend. The difference is the lack of fine modulation of sidelobes, but the modulation is lower than the sidelobes by 3 orders of magnitude. The agreement has proved that the correction method is practicable, which can effectively solve the effect estimation among the different types and F number of optical systems.
Laser active suppressing jamming is one of the most effective technologies to cope with electro-optical imaging system. In order to obtain the exact assessment of laser jamming effect, we must acquire the laser jamming effect image. We proposed two methods for simulation implementation of laser jamming effect image in this paper, which were respectively based on theoretical model and measured data. First of all, the implementation flows of two methods were introduced. Secondly, we successively finished the simulation of laser jamming effect image according to the two flows. By comparing with the measured image, the significant correlation can be obtained with the method based on measured data, regardless of whether the jamming laser energy was high or low. The significant correlation can be achieved with the method based on theoretical model when the jamming laser energy was low. The research results can provide the technical reference for carrying out laser jamming experiment.
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