红外探测系统及其环境的杂散辐射传输特性模拟分析
发布时间：2018-10-26 10:52
【摘要】：在实际工程应用中,多类红外探测系统的工作热环境十分恶劣,如温度过高且温度场分布不均匀等,而且有些工况下温度场分布甚至是非稳态的。过高的温度除了会使得探测系统内部的元器件表面演变成一系列的杂散辐射源,引起的噪声使探测系统的无法正常工作。本文基于上述工程背景,研究了红外探测系统中由高温壁面和高温半透明介质产生的杂散辐射在系统内部的传输问题。本文对两个不同的探测系统——某舱内红外探测系统以及高温透射比实验测量装置,从杂散辐射传输特性以及杂散辐射抑制效果两个研究角度入手,对上述红外探测系统的杂散辐射传输问题进行了系统性研究。本文的工作主要从以下三个方面展开:1.基于蒙特卡罗法的基本原理,对原有的杂散辐射分析程序进行了优化和改进,增加了介质辐射传输以及不均匀温度场辐射计算两个模块,提高了程序的计算通用性和灵活性,并对改进后的程序代码进行了可靠性验证分析。2.以改进的程序代码为仿真平台,采用反向蒙特卡罗计算方法,对某舱内红外探测系统中的杂散辐射传输过程进行了模拟分析。针对系统中三类不同的杂散辐射源——均温表面、罩体内表面以及侧窗光学窗口,文中采用不同的建模方法,分别对由它们发出的杂散辐射进行跟踪计算,并进行了对比和综合,从而确定出到达探测面的杂散辐射的主要来源、传递规律以及在探测面上的分布,为杂散辐射抑制措施的提出等后续工作提供了合理依据。3.针对一种高温透射比的实验测量装置中由于高温加热引起的杂散辐射传输问题进行模拟分析,确定了杂散辐射对目标信号的干扰作用,以及各高温表面和高温半透明体杂散辐射的相对大小。此外,文中还进一步探究了的杂散辐射抑制结构对消除系统中杂散辐射的作用,讨论了消光筒、反射镜组以及遮光屏等部件的几何尺寸和空间方位杂散辐射抑制性能的影响,确定了杂散辐射抑制结构的最佳尺寸和空间布置方式,使该测量装置内的杂散辐射通量尽可能减小至最低水平,以保证该测量装置精确、稳定地工作。
[Abstract]:In practical engineering application, the working thermal environment of many kinds of infrared detection systems is very bad, such as the temperature is too high and the temperature field distribution is not even uniform, and the temperature field distribution is even unsteady under some working conditions. If the temperature is too high, the surface of the components inside the detection system will evolve into a series of stray radiation sources, and the noise caused by it will make the detection system unable to work properly. Based on the above engineering background, the propagation of stray radiation generated by high temperature wall and high temperature translucent medium in infrared detection system is studied in this paper. In this paper, two different detection systems, the infrared detection system in a cabin and the high temperature transmittance experimental measuring device, are studied from two aspects: the characteristics of stray radiation transfer and the suppression effect of stray radiation. The stray radiation transmission of the infrared detection system mentioned above is studied systematically. The work of this paper is mainly carried out from the following three aspects: 1. Based on the basic principle of Monte Carlo method, the original stray radiation analysis program is optimized and improved. Two modules of medium radiation transfer and non-uniform temperature field radiation calculation are added, and the calculation generality and flexibility of the program are improved. And the improved program code for reliability verification analysis. 2. Based on the improved program code and the inverse Monte Carlo method, the stray radiation transfer process in an infrared detection system in a cabin is simulated and analyzed. Aiming at three kinds of stray radiation sources in the system, such as the homogeneous surface, the inner surface of the radome and the optical window of the side window, different modeling methods are used to track and calculate the stray radiation emitted by them. By comparing and synthesizing, the main sources, transfer rules and distribution of stray radiation reaching the detection surface are determined, which provides a reasonable basis for further work such as putting forward the measures to restrain stray radiation. In this paper, the problem of stray radiation transfer caused by high temperature heating in a high temperature transmittance measuring device is simulated and analyzed, and the interference effect of stray radiation on target signal is determined. And the relative magnitude of stray radiation of each high temperature surface and high temperature translucent body. In addition, the effect of the stray radiation suppression structure on eliminating the stray radiation in the system is further explored, and the effects of the geometric dimension and spatial azimuth of the extinction tube, the reflector set and the shading screen on the suppression performance of the stray radiation in the system are discussed. The optimum size and spatial arrangement of the stray radiation suppression structure are determined, so that the stray radiation flux in the measuring device can be reduced to the lowest level as far as possible, so as to ensure the accurate and stable operation of the measuring device.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN215
本文编号：2295479
[Abstract]:In practical engineering application, the working thermal environment of many kinds of infrared detection systems is very bad, such as the temperature is too high and the temperature field distribution is not even uniform, and the temperature field distribution is even unsteady under some working conditions. If the temperature is too high, the surface of the components inside the detection system will evolve into a series of stray radiation sources, and the noise caused by it will make the detection system unable to work properly. Based on the above engineering background, the propagation of stray radiation generated by high temperature wall and high temperature translucent medium in infrared detection system is studied in this paper. In this paper, two different detection systems, the infrared detection system in a cabin and the high temperature transmittance experimental measuring device, are studied from two aspects: the characteristics of stray radiation transfer and the suppression effect of stray radiation. The stray radiation transmission of the infrared detection system mentioned above is studied systematically. The work of this paper is mainly carried out from the following three aspects: 1. Based on the basic principle of Monte Carlo method, the original stray radiation analysis program is optimized and improved. Two modules of medium radiation transfer and non-uniform temperature field radiation calculation are added, and the calculation generality and flexibility of the program are improved. And the improved program code for reliability verification analysis. 2. Based on the improved program code and the inverse Monte Carlo method, the stray radiation transfer process in an infrared detection system in a cabin is simulated and analyzed. Aiming at three kinds of stray radiation sources in the system, such as the homogeneous surface, the inner surface of the radome and the optical window of the side window, different modeling methods are used to track and calculate the stray radiation emitted by them. By comparing and synthesizing, the main sources, transfer rules and distribution of stray radiation reaching the detection surface are determined, which provides a reasonable basis for further work such as putting forward the measures to restrain stray radiation. In this paper, the problem of stray radiation transfer caused by high temperature heating in a high temperature transmittance measuring device is simulated and analyzed, and the interference effect of stray radiation on target signal is determined. And the relative magnitude of stray radiation of each high temperature surface and high temperature translucent body. In addition, the effect of the stray radiation suppression structure on eliminating the stray radiation in the system is further explored, and the effects of the geometric dimension and spatial azimuth of the extinction tube, the reflector set and the shading screen on the suppression performance of the stray radiation in the system are discussed. The optimum size and spatial arrangement of the stray radiation suppression structure are determined, so that the stray radiation flux in the measuring device can be reduced to the lowest level as far as possible, so as to ensure the accurate and stable operation of the measuring device.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN215
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