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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。 flbd0NB 2uW;
xfeY 成像示意图 ^Y \"}D 首先我们建立十字元件命名为Target aeM+ d`f n 0L^e 创建方法: \X D6 pr@ ;h 面1 : _A9AEi'. 面型:plane @K!T,U 材料:Air =-n}[Y}A 孔径:X=1.5, Y=6,Z=0.075,形状选择Box `1fY)d^ZS n;Vs_u/Nx r[iflBP 辅助数据: h3
}OX{k 首先在第一行输入temperature :300K, MAPGJ"?
emissivity:0.1; c`w}|d]mC f6>b|k~ @lr ztM 面2 : c<Tf
2]vZE 面型:plane g1 "kTh 材料:Air &d^m 1 孔径:X=1.5, Y=6,Z=0.075,形状选择Box 8'io$6d= uz
jU2 "J_9WUN 位置坐标:绕Z轴旋转90度, M%P:n/j c4eBt))}V tl^9WG 辅助数据: vV-`jsq20H 6mxfLlZ 首先在第一行输入temperature :300K,emissivity: 0.1; ,R*
]>' M!D3 }JRm U8n V[ Target 元件距离坐标原点-161mm; cU!vsdR3 S3Xl ],Do6
@M- 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 Cjlk srrgvG, v;D~Pa 探测器参数设定: @Z:l62l=bE @Qt{jI! 在菜单栏中选择Create/Element Primitive /plane ')<hON44EX PIS2Ed] K_Eux rPn *#+An<iT ; *_\_'@1|J) R`E ~ZWC4V 元件半径为20mm*20,mm,距离坐标原点200mm。 59;KQ V/9!K%y 光源创建: d)Y}>@:W vy:Z /1q 光源类型选择为任意平面,光源半角设定为15度。 U-tTW*[1] bdE[;+58 4zFW-yy 我们将光源设定在探测器位置上,具体的原理解释请见本章第二部分。 )|#sfHv7 5">Z'+8 我们在位置选项又设定一行的目的是通过脚本自动控制光源在探测器平面不同划分区域内不同位置处追迹光线。 P.9>z7l{ bq0zxg% JYHl,HH#z 功率数值设定为:P=sin2(theta) theta为光源半角15度。我们为什么要这么设定,在第二部分会给出详细的公式推导。 1\I}2; AFE~
v\Gz 创建分析面: LyFN.2qw 6?c7$Y mxdr,Idx 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。 tf`^v6m%] 28d'7El$ cTT L1SW 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。 Se =`N nUOz\y FRED在探测器上穿过多个像素点迭代来创建热图 /jJw0 5;L I^$fMdT FRED具有一个内置的可编译的Basic脚本语言。从Visual Basic脚本语言里,几乎所有用户图形界面(GUI)命令是可用这里的。FRED同样具有自动的客户端和服务器能力,它可以被调用和并调用其他可启动程序,如Excel。因此可以在探测器像素点上定义多个离轴光源,及在FRED Basic脚本语言里的For Next loops语句沿着探测器像素点向上和向下扫描来反向追迹光线,这样可以使用三维图表查看器(Tools/Open plot files in 3D chart)调用和查看数据。 g{&ui.ml& 将如下的代码放置在树形文件夹 Embedded Scripts, gV_}-VvP oe-\ozJ0 amY!qg0P* 打开后清空里面的内容,此脚本为通用脚本适用于一切可热成像的应用。 wNd isI ~oY^;/ j 绿色字体为说明文字, "@2-Zdrr1< B:'US&6Lf' '#Language "WWB-COM" .U]-j\ 'script for calculating thermal image map ^s"R$?;h 'edited rnp 4 november 2005 ji0@P'^; v mk2{f,g 'declarations ye5&)d"fa( Dim op As T_OPERATION t;\Y{` Dim trm As T_TRIMVOLUME sLxc(d'A Dim irrad(32,32) As Double 'make consistent with sampling ER.}CM6{[ Dim temp As Double FVJGL Dim emiss As Double hM@>q&q_ Dim fname As String, fullfilepath As String @b2aNS<T A6(/;+n 'Option Explicit 7J<5f) JIq=* ' Sub Main $yNS
pNmT0 'USER INPUTS c\AfaK^KF nx = 31 [ v*ju! ny = 31 \
}G>8^ numRays = 1000 #S"nF@ minWave = 7 'microns cyz3,3\e maxWave = 11 'microns [.wYdv35 sigma = 5.67e-14 'watts/mm^2/deg k^4 ?gGHj-HYJ fname = "teapotimage.dat" 5$C-9 \bw2u! Print "" R8'RA%O9J Print "THERMAL IMAGE CALCULATION" -nV9:opD h~zT ydnH detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 j&qub_j"xX /9fR'EO{x Print "found detector array at node " & detnode C;^X[x%h7$ [d]9Oa4 srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 {R`[kt i=2N;sAl Print "found differential detector area at node " & srcnode
[/8%3 l+^*LqEW2 GetTrimVolume detnode, trm b d!Y\OD detx = trm.xSemiApe 'TB2:W3 dety = trm.ySemiApe R (n2A$ area = 4 * detx * dety hp|YE'uYT Print "detector array semiaperture dimensions are " & detx & " by " & dety `VguQl_,gA Print "sampling is " & nx & " by " & ny *\F~[ IW] rb/H 'reset differential detector area dimensions to be consistent with sampling CRy|kkT pixelx = 2 * detx / nx X#^[<5 pixely = 2 * dety / ny G]&qx`TBK SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False 7HYwLG:\~ Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 uQKT |+D!=
:x 'reset the source power R.<g3"Lm> SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) 4{|"7/PE1 Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" SOA,kwHRe pOoEI+t 'zero out irradiance array $/Uq0U For i = 0 To ny - 1 F*ylnB3z For j = 0 To nx - 1 ]3Sp W{=^( irrad(i,j) = 0.0 inp7K41 Next j ,Ma^ &ypH Next i +9sQZB# ( Yrq~5)% 'main loop (KZ{^X?a EnableTextPrinting( False ) (X*^dO =>~:<X., ypos = dety + pixely / 2 3F^Q51:t For i = 0 To ny - 1 *.w9c xpos = -detx - pixelx / 2 #&e-|81H ypos = ypos - pixely Dk5 1z@ yyTnL 2Y9 EnableTextPrinting( True ) ="l/ klYV Print i )MT}+ai EnableTextPrinting( False ) 5146kp|1 XC#oB~K' LCV(,lu For j = 0 To nx - 1 $U-0)4yf "qy,*{~ xpos = xpos + pixelx N?`' /e >9Vn.S 'shift source l,aay-E LockOperationUpdates srcnode, True *wjrR1#81x GetOperation srcnode, 1, op -jmY)(\ op.val1 = xpos +R75v ) op.val2 = ypos TIg3`Fon SetOperation srcnode, 1, op sU^1wB
Rj LockOperationUpdates srcnode, False * kh tJ]= ]A_`0"m.U raytrace =:U`k0rn! DeleteRays :7;@ZEe CreateSource srcnode lr&a;aZp TraceExisting 'draw lPAQ3t!, w_V P
J 'radiometry _7y[B&g[r For k = 0 To GetEntityCount()-1 %iqD5x$OA If IsSurface( k ) Then vW@=<aS Z temp = AuxDataGetData( k, "temperature" ) KwVbbC3 emiss = AuxDataGetData( k, "emissivity" ) es0hm2HT3 If ( temp <> 0 And emiss <> 0 ) Then Ab;.5O$y ProjSolidAngleByPi = GetSurfIncidentPower( k ) eS){1 frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) Lu%b9Jk irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi @IZnFHN End If m.0*NW 3=V&K- End If ql~J8G9 +1!ia] Next k o^wqFX(Y 2MK-5Kg Next j O^rD HFj, u)Whr@m Next i `">= EnableTextPrinting( True ) a?oI>8* 4Wp=y 'write out file hgE71H\s fullfilepath = CurDir() & "\" & fname Gav$HLx Open fullfilepath For Output As #1 2st3 Print #1, "GRID " & nx & " " & ny b\,+f n Print #1, "1e+308" yaX
iE_. Print #1, pixelx & " " & pixely EKN~H$. Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 |k9
C/ =-Ck4e *T maxRow = nx - 1 sa8Vvzvo. maxCol = ny - 1 ue>D7\8 For rowNum = 0 To maxRow ' begin loop over rows (constant X) :rP=t , row = "" \GU<43J2uo For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) f%8C!W]Dm row = row & irrad(colNum,rowNum) & " " ' append column data to row string $<OD31T Next colNum ' end loop over columns o{[qZc_% D)}v@je"yP Print #1, row y<.5xq5_3 !p/goqT~dY Next rowNum ' end loop over rows -tU'yKhn Close #1 lk =<A"^S o#N+Y?O Print "File written: " & fullfilepath dQG=G%W Print "All done!!" ,/U6[P_C5 End Sub #p{4^ HE\K@3- 在输出报告中,我们会看到脚本对光源的孔径和功率做了修改,并最终经过31次迭代,将所有的热成像数据以dat的格式放置于: WfRXP^a {\\Tgs O33`+UV"W 找到Tools工具,点击Open plot files in 3D chart并找到该文件 <{cQ2 !TcJ)0
MUwMb!Z.s 打开后,选择二维平面图: h>bx}$q 7PF%76TO
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