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简介:本文是以十字元件为背景光源,经过一个透镜元件成像在探测器上,并显示其热成像图。 m/(/!MVy DUH_LnHw) 成像示意图 `PvS+>q 首先我们建立十字元件命名为Target \pTv;( 64`l?F 创建方法: v\qyDZ VV ! hEZV&y 面1 : "a33m:]J 面型:plane C8)Paop$ 材料:Air ;OD-?bC 孔径:X=1.5, Y=6,Z=0.075,形状选择Box QnS#"hc\a _@gg,2
u- wL^x9O|`p9 辅助数据: C dPQhv)m 首先在第一行输入temperature :300K, 0uPcEpIA emissivity:0.1; PMW@xk^<Y ?~#[cx 8Q{9AoQ3' 面2 : 5MZv!N 面型:plane D/%v/mpj$ 材料:Air :(tKc3z 孔径:X=1.5, Y=6,Z=0.075,形状选择Box OYn5k6 cz>)6#&O ko'V8r`V 位置坐标:绕Z轴旋转90度, 8 ph1xQ' :`"-Jf Yl?s^]SFU 辅助数据: ,# .12Q! 61OlnmvE 首先在第一行输入temperature :300K,emissivity: 0.1; ImH9 F\ ]Y76~!N 99,=dzm Target 元件距离坐标原点-161mm; '&K' 0qG SMRCG"3qwA {#`wW`U^ 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 S1'?"zAmd
4gdXO R\#5;W^ 探测器参数设定: $AMcU5^b7 .pm%qEh 在菜单栏中选择Create/Element Primitive /plane W_Y56@7e MBKF8b'k $#W^JWN1 *ezft&{)` |E||e10wR <mTo54g 元件半径为20mm*20,mm,距离坐标原点200mm。 A=e1uBGA F{.g05^y 光源创建: *-q&~ ^nOh8L; 光源类型选择为任意平面,光源半角设定为15度。 O*,O]Q tI#65ox# f4NN?"W) 我们将光源设定在探测器位置上,具体的原理解释请见本章第二部分。 2e3AmR@* xcQ^y}JN 我们在位置选项又设定一行的目的是通过脚本自动控制光源在探测器平面不同划分区域内不同位置处追迹光线。 _+7P"B|\ xCT2FvX6 IDh`*F 功率数值设定为:P=sin2(theta) theta为光源半角15度。我们为什么要这么设定,在第二部分会给出详细的公式推导。 D@[#7:rHL Ah5o>ZtcO 创建分析面: vQn hb% yGC
HWP 2\+N<-(F5 到这里元件参数设定完成,现在我们设定元件的光学属性,在前面我们分别对第一和第二面设定的温度和发射系数,散射属性我们设定为黑朗伯,4%的散射。并分别赋予到面一和面二。 I|c?*~7* xUa9>=JU{ }XpZgd$ 到此,所有的光学结构和属性设定完成,通过光线追迹我们可以查看光线是否可以穿过元件。 o:
> (Tv K>XZrt FRED在探测器上穿过多个像素点迭代来创建热图 )qFqf<:yc ;<E?NBV^ FRED具有一个内置的可编译的Basic脚本语言。从Visual Basic脚本语言里,几乎所有用户图形界面(GUI)命令是可用这里的。FRED同样具有自动的客户端和服务器能力,它可以被调用和并调用其他可启动程序,如Excel。因此可以在探测器像素点上定义多个离轴光源,及在FRED Basic脚本语言里的For Next loops语句沿着探测器像素点向上和向下扫描来反向追迹光线,这样可以使用三维图表查看器(Tools/Open plot files in 3D chart)调用和查看数据。 5bI4'
; 将如下的代码放置在树形文件夹 Embedded Scripts, T<yfpUzX !/|B4Yv v{*2F 打开后清空里面的内容,此脚本为通用脚本适用于一切可热成像的应用。 gf4Hq&Rf Ep')@7^n 绿色字体为说明文字, Iq6EoDoq d0zp89BEn '#Language "WWB-COM" Yc3\ 'script for calculating thermal image map ^r7KEeVD 'edited rnp 4 november 2005 JPj/+f M;KeY[u 'declarations GU Mf}y Dim op As T_OPERATION p#rqe<Ua Dim trm As T_TRIMVOLUME QAY:H@Gt: Dim irrad(32,32) As Double 'make consistent with sampling ]<q!pE;t Dim temp As Double 4ISIg\:c* Dim emiss As Double IM2<:N%' Dim fname As String, fullfilepath As String JEZ0O&_R 0XyPG 'Option Explicit k{ZQM Ze[\y(K! Sub Main PtL8Kd0`C 'USER INPUTS b#t5Dve nx = 31 EF=5[$
u ny = 31 ?"?AH/E D numRays = 1000 r(n>N0:0Ls minWave = 7 'microns .O+,1&D5 maxWave = 11 'microns 7W&XcF sigma = 5.67e-14 'watts/mm^2/deg k^4 ^HI2Vp fname = "teapotimage.dat" 4`RZ&w;1H2 9uX15a Print "" 0YoV`D,U Print "THERMAL IMAGE CALCULATION" |&bucG= eU]I !pI< detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 mOLz(0 {sq:vu@NC Print "found detector array at node " & detnode 7v.O Lp g(Oor6Pp srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 W3%RB[s- uX1{K%^<TW Print "found differential detector area at node " & srcnode FZ8Qj8
k%s,(2)30 GetTrimVolume detnode, trm nKTi"2dm detx = trm.xSemiApe ,k9.1kjO*) dety = trm.ySemiApe <fMQ#No area = 4 * detx * dety Un5 AStG Print "detector array semiaperture dimensions are " & detx & " by " & dety Zl]@;*u Print "sampling is " & nx & " by " & ny YNp-A.o
W@ =i/r: 'reset differential detector area dimensions to be consistent with sampling I0^oaccM pixelx = 2 * detx / nx {q;_Dd pixely = 2 * dety / ny E^pn-rB SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False [~n|R Oo Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 % S>6Q^B moMNd(p 'reset the source power PklJU:Pu\U SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) |0_5iFAB| Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" uY3#, iI*qx+>f? 'zero out irradiance array :x?G[x= For i = 0 To ny - 1 _,p/2m-Pj For j = 0 To nx - 1 ``rYzj_ irrad(i,j) = 0.0 7p{uRSE4._ Next j rvb@4-i>iI Next i ^
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#U-*Z7 'main loop D>-Pv-f/ EnableTextPrinting( False ) 0AhUH|] X|R"8cJ ypos = dety + pixely / 2 dXU6TCjU7 For i = 0 To ny - 1 Kc>Rd xpos = -detx - pixelx / 2 rD c$# ypos = ypos - pixely lg^Lk\Y+re -KqMSf&9 EnableTextPrinting( True ) ;H?tcb* Print i Ov.oyke4 EnableTextPrinting( False ) !4YmaijeN A\.{(,;kp ykGA.wo7/P For j = 0 To nx - 1 w.=rea~ ,z+n@sUR: xpos = xpos + pixelx 1{qG?1<zZ6 xBqZ:
BQ 'shift source 8Qkwg]X LockOperationUpdates srcnode, True v,iq,p)& GetOperation srcnode, 1, op EKmn@S-&P op.val1 = xpos #VZ
js`d6 op.val2 = ypos bGlr>@;-r SetOperation srcnode, 1, op b~TTz`HZ LockOperationUpdates srcnode, False ?U2 'L2y }|znQ3A2\l raytrace W!* P DeleteRays ?|n @%' CreateSource srcnode w@,v$4Oi TraceExisting 'draw x3nUKQtk:8 vJb/.)gh] 'radiometry DYgz;Y/%l For k = 0 To GetEntityCount()-1 =}SLQdT If IsSurface( k ) Then W"tGCnd temp = AuxDataGetData( k, "temperature" ) F-D$Y?m emiss = AuxDataGetData( k, "emissivity" ) ~!/a gLwY If ( temp <> 0 And emiss <> 0 ) Then 7De BeY ProjSolidAngleByPi = GetSurfIncidentPower( k ) DJ!pZUO{ frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) 7<X!Xok irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi g$qM}#s0} End If 3u,B< Zk31|dL End If hE4qs~YB! B}N1}i+
Next k LO38}w<k =RofC9, Next j U8<C4 Z55C4F5v Next i d?/>Qqw:# EnableTextPrinting( True ) e&NJj:Ph* /!*=* 'write out file x,GLGGi}_x fullfilepath = CurDir() & "\" & fname z<9Llew^e Open fullfilepath For Output As #1 -Q%Pg<Q-# Print #1, "GRID " & nx & " " & ny o
ethO Print #1, "1e+308" IL"N_ux~w~ Print #1, pixelx & " " & pixely VaO[SW^ Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 Cli:;yi&n 9{IDw maxRow = nx - 1 bfK4ps}m* maxCol = ny - 1 lLU8eHf\ For rowNum = 0 To maxRow ' begin loop over rows (constant X) NGW:hgf row = "" wv Mp~ For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) 9H+Q/Q*-a row = row & irrad(colNum,rowNum) & " " ' append column data to row string Ss\FSEN!/ Next colNum ' end loop over columns ENFM``dV# ^^*Ia'9 Print #1, row :kd]n$] }R_Rw:W Next rowNum ' end loop over rows h]j>S Close #1 }?sC1]-j& Uyd' uC Print "File written: " & fullfilepath ;f)AM}~^Q Print "All done!!" zA/Fh(uX End Sub xRqA^Ad 9VSi2p* 在输出报告中,我们会看到脚本对光源的孔径和功率做了修改,并最终经过31次迭代,将所有的热成像数据以dat的格式放置于: #J %pf9Yd0t sFsf~| 找到Tools工具,点击Open plot files in 3D chart并找到该文件 .-Dc%ap] 6.6?Rp". 4^:$|\?] 打开后,选择二维平面图: Q&/WVRD 2W#^^4^+
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