Study on the radiation characteristics of infrared jamming target and the anti-interference capability of infrared imaging system, through the analysis of radiation theory, the experimental study analyzes the change of radiation intensity over time, the radiation intensity of different projection directions and different delivery amount over time, the spectral radiation characteristics of the jamming target and the radiation area of the interference target over time. Combined with the development characteristics of infrared imaging system, it provides the anti-interference effective response strategy of infrared imaging system under practical application condition. The results can provide experimental support for enhancing the anti-interference capability evaluation of the infrared imaging system.
In view that the sun is a main stray light source for space-based camera with wide filed as high-intensity light, the influence on the image quality of the camera was studied. Through the design of the camera’s lens hood, the number of stray lights scattering on the surface of the lens is reduced. Then the stray light which can reach the detector is diminished. Compare the image quality of the flying surveillance camera with which before the lens hood designed, the maximum value of PST(θ) outside the critical angle 55° was reduced to 1.1099×10-9. Stray light was significantly inhibited, and the image quality was effectively improved.
The interference factors produced by the strong radiation interference source in the infrared imaging system are mainly: super-saturation crosstalk effect, spatial transfer characteristic ambiguity phenomenon, halo effect and transient environmental temperature adaptability. These interference phenomena will reduce the imaging of the infrared imaging system, produce instantaneous “blinding” or key information loss, and affect the advantages of the system in target detection, capture, identification and tracking. The formation mechanism and theoretical basis of each influencing factor are analyzed, and the methods of eliminating interference characteristics are studied. Through experimental research, the method of judging the imaging quality of the infrared imaging system at different temperatures is studied. The results show that the temperature adaptability of the infrared imaging system greatly affects the performance of the system detection and recognition. Therefore, the research on the temperature adaptability of the infrared imaging system can provide a basis for the quantitative characterization and simulation calculation of the interference characteristics of strong radiation sources in order to increase the application of the system in the research field and propose ideas for further research.
The optical tracking and measuring on mobile type of large aperture ground-based measurement system can obtain the real-time sequence image information and position information of the target, analyze the motion characteristics of them, monitor and predict the trajectory information of the target in real time. At the same time, it has the characteristics of flexible deployment. In the aspects of in-orbit monitoring and prediction of space debris target, in-orbit live image acquisition and infrared radiation characteristic measurement and analysis of targets, combined with advanced orbit prediction technology, it can be used for real-time trajectory tracking and measurement, and the related physical events in the course of operation can be studied. The detection information is analyzed and processed in real time to obtain he basic conditions for the research of high precision, real environment measurement, multi-state measurement and multi-feature measurement.
A small target is a target which is far enough to a detector, and its image on FPA can’t be large enough to show its shape and size. In this situation, when a small target is detected by an infrared imaging single-band detector, we can only analyze it by the dispersion point or the subpixel image caused by it. The target discrimination can be impossible when it meets a smaller-sized target with higher temperature and a larger-sized target with lower temperature, because their image on FPA can be quite similar when they’re far enough. However, with the dual-band detection, we can figure out the temperature via dual-band ratio easily, without the information of distance and target size. Equivalent area can be also figure out during this calculation. The target discrimination can be achieved with the temperature and equivalent area known. And according to some priori knowledge, can we make those target recognized in a particular scene. This article briefly show the benefit of dual-band detection compared to single band detection.
The main optical system of multi-band co-caliber infrared system is designed by using a Cassegrain telescope whose primary mirror (PM) and secondary mirror (SM) are aspherical form, and the structure of which is using total reflection system for the former level, the refractive lens group for the stage. After the target radiation to reach the primary mirror, reflecting onto the secondary mirror, and on top of toggling the spectral radiometric flux , respectively, which is reflected by different spectrum region, transmit to infrared focal plane array (IR FPA) for each other imaging detector. Then, photoelectric converse those information which were received by IRFPA. The output signal of detectors are processed and displayed by Read-Out Integrated Circuit (ROIC). We are confirming the image quality of different bands during system model optimization design. According to the specification of design system, establishing the measurement program of quantitative study. The results experimental measurement shows that the optimized design of the optical system has good validity.
This paper puts forward a method by realizing the internal and external radiation calibration transfer for infrared radiation characteristics quantitative measuring system. Through technological innovation and innovation application to establish a theoretical model of the corresponding radiated transfer method.
This method can be well in engineering application for technology conversion process of radiometric calibration that with relatively simple and effective calibration in the half light path radiation instead of complex difficult whole optical path radiometric calibration. At the same time, it also will provide the basis of effective support to further carry out the target radiated characteristics quantitative measurement and application for ground type infrared radiated quantitative measuring system.
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