紅外探測系統(tǒng)及其環(huán)境的雜散輻射傳輸特性模擬分析
發(fā)布時間：2018-10-26 10:52
【摘要】：在實際工程應用中,多類紅外探測系統(tǒng)的工作熱環(huán)境十分惡劣,如溫度過高且溫度場分布不均勻等,而且有些工況下溫度場分布甚至是非穩(wěn)態(tài)的。過高的溫度除了會使得探測系統(tǒng)內(nèi)部的元器件表面演變成一系列的雜散輻射源,引起的噪聲使探測系統(tǒng)的無法正常工作。本文基于上述工程背景,研究了紅外探測系統(tǒng)中由高溫壁面和高溫半透明介質(zhì)產(chǎn)生的雜散輻射在系統(tǒng)內(nèi)部的傳輸問題。本文對兩個不同的探測系統(tǒng)——某艙內(nèi)紅外探測系統(tǒng)以及高溫透射比實驗測量裝置,從雜散輻射傳輸特性以及雜散輻射抑制效果兩個研究角度入手,對上述紅外探測系統(tǒng)的雜散輻射傳輸問題進行了系統(tǒng)性研究。本文的工作主要從以下三個方面展開:1.基于蒙特卡羅法的基本原理,對原有的雜散輻射分析程序進行了優(yōu)化和改進,增加了介質(zhì)輻射傳輸以及不均勻溫度場輻射計算兩個模塊,提高了程序的計算通用性和靈活性,并對改進后的程序代碼進行了可靠性驗證分析。2.以改進的程序代碼為仿真平臺,采用反向蒙特卡羅計算方法,對某艙內(nèi)紅外探測系統(tǒng)中的雜散輻射傳輸過程進行了模擬分析。針對系統(tǒng)中三類不同的雜散輻射源——均溫表面、罩體內(nèi)表面以及側(cè)窗光學窗口,文中采用不同的建模方法,分別對由它們發(fā)出的雜散輻射進行跟蹤計算,并進行了對比和綜合,從而確定出到達探測面的雜散輻射的主要來源、傳遞規(guī)律以及在探測面上的分布,為雜散輻射抑制措施的提出等后續(xù)工作提供了合理依據(jù)。3.針對一種高溫透射比的實驗測量裝置中由于高溫加熱引起的雜散輻射傳輸問題進行模擬分析,確定了雜散輻射對目標信號的干擾作用,以及各高溫表面和高溫半透明體雜散輻射的相對大小。此外,文中還進一步探究了的雜散輻射抑制結(jié)構對消除系統(tǒng)中雜散輻射的作用,討論了消光筒、反射鏡組以及遮光屏等部件的幾何尺寸和空間方位雜散輻射抑制性能的影響,確定了雜散輻射抑制結(jié)構的最佳尺寸和空間布置方式,使該測量裝置內(nèi)的雜散輻射通量盡可能減小至最低水平,以保證該測量裝置精確、穩(wěn)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.
【學位授予單位】：哈爾濱工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TN215
本文編號：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.
【學位授予單位】：哈爾濱工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TN215
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