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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。 #tfJ?w` iH$N HfH 成像示意图 9q5[W=| 首先我们建立十字元件命名为Target G?V3lQI1n .ev]tu2N 创建方法: AP~!YwLW J *B`C^i 面1 : 07MLK8jS 面型:plane
q_K1L 材料:Air i@;a%$5 孔径:X=1.5, Y=6,Z=0.075,形状选择Box h7w<.zwu
t UM]wDFn'E VuR BJ2D 辅助数据: z&:[.B 首先在第一行输入temperature :300K, ynd}w
G' emissivity:0.1; Umd!j, EtcamI*` N1$P6ZF 面2 : Lr~K3nb 面型:plane Jzj~uz 材料:Air t.TQ@c+,J 孔径:X=1.5, Y=6,Z=0.075,形状选择Box S`^W#,rj iUKj:q: (M=Br 位置坐标:绕Z轴旋转90度, `fRy"44nR G@'0vYb# W
| }Hl{} 辅助数据: :tgTYIF s [!SG`& 首先在第一行输入temperature :300K,emissivity: 0.1; :Ry24X utE:HD.PN .G]# _U Target 元件距离坐标原点-161mm; Y>%NuL|s +OmSR*fA0 uj@<_|7 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 {?iqO? *l^'v9
Y[DKj!v 探测器参数设定: `3KprpE8v +g[B &A!d+ 在菜单栏中选择Create/Element Primitive /plane w;(gi P(;c`
i=D,T[|>a Z^l!y5s/H &1{k^>oz cn0Fz"d 元件半径为20mm*20,mm,距离坐标原点200mm。 @FV;5M:I m0"\3@kB 光源创建: rZv+K/6*M (AYS>8O& 光源类型选择为任意平面,光源半角设定为15度。 aiHr2x6 c
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6F %},gE[N!J 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。 /WfVG\NF $%JyM 我们在位置选项又设定一行的目的是通过脚本自动控制光源在探测器平面不同划分区域内不同位置处追迹光线。 bAiw]xi a:}"\>Aj cZ >W8{G 功率数值设定为:P=sin2(theta) theta为光源半角15度。我们为什么要这么设定,在第二部分会给出详细的公式推导。 8957$g OpLSjr 创建分析面: nS4S[|w" obq}# j%;)CV
G" 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。 ;%<4U^2 Ol[gck|~ DcA'{21 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。 (do=o&9pm N -]PK%* FRED在探测器上穿过多个像素点迭代来创建热图 ?m1$*j u2]g1XjeG FRED具有一个内置的可编译的Basic脚本语言。从Visual Basic脚本语言里,几乎所有用户图形界面(GUI)命令是可用这里的。FRED同样具有自动的客户端和服务器能力,它可以被调用和并调用其他可启动程序,如Excel。因此可以在探测器像素点上定义多个离轴光源,及在FRED Basic脚本语言里的For Next loops语句沿着探测器像素点向上和向下扫描来反向追迹光线,这样可以使用三维图表查看器(Tools/Open plot files in 3D chart)调用和查看数据。 oNZW#<K 将如下的代码放置在树形文件夹 Embedded Scripts, 1,QZnF!.x e9_+$Oo H>f{3S-% 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。 5-HJ&Q lM*O+k 绿色字体为说明文字, 4d
G- "}p?pF<'0 '#Language "WWB-COM" (N|xDl&; 'script for calculating thermal image map |:+pPh!- 'edited rnp 4 november 2005 o$VH,2 QF ~iZF~PQ1_ 'declarations rVy\,#| Dim op As T_OPERATION ;/ KF3
% Dim trm As T_TRIMVOLUME K)&XQ`& Dim irrad(32,32) As Double 'make consistent with sampling W;dzLgc Dim temp As Double [E
(M(w': Dim emiss As Double [V,
;X Dim fname As String, fullfilepath As String lMez!qx,= 43=-pyp 'Option Explicit dY@Tt&k8E 0DIM]PS Sub Main \BaN5+B6 'USER INPUTS h<ct W>6v nx = 31 x[W]?`W3r~ ny = 31 !a(qqZ|s numRays = 1000 *9Js:z7I minWave = 7 'microns 9~'Ip7X,! maxWave = 11 'microns 5qQ(V)ah sigma = 5.67e-14 'watts/mm^2/deg k^4 Q
EGanpz fname = "teapotimage.dat" 9c}]:3#XO %GCd?cFF Print "" 1vK(^u[ Print "THERMAL IMAGE CALCULATION" UN?T}p-
oF w^E]N detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 *2
$m>N iH}rI'U. Print "found detector array at node " & detnode [I<'E
LX q\y# srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 8tRhV2 :'rZZeb' Print "found differential detector area at node " & srcnode F"f}vl ?Wz(f {Hm GetTrimVolume detnode, trm H&=4y) /. detx = trm.xSemiApe `pAp[]SfQd dety = trm.ySemiApe VE"0VB. area = 4 * detx * dety DD6`k*RIk. Print "detector array semiaperture dimensions are " & detx & " by " & dety 9g5{3N3 Print "sampling is " & nx & " by " & ny ySK Yqt z 7U
)qC}( 'reset differential detector area dimensions to be consistent with sampling LOUKURe E pixelx = 2 * detx / nx .'{6u;8 pixely = 2 * dety / ny -kri3?Y, SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False WlRZ|. Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 VBsFT2XiL <\9Ijuq}k
'reset the source power UNcJ= SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) HD8"=7zJk Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" =']}; 8j+:s\ 'zero out irradiance array p9 ,\ {Is For i = 0 To ny - 1 9k+&fyy For j = 0 To nx - 1 J (&M<<% irrad(i,j) = 0.0 ny_ kr`$42 Next j S}p&\w H Next i -f;j1bQ [FV=@NI 'main loop )>X|o$2 EnableTextPrinting( False ) # pjyhH@ xBE
RCO^ ypos = dety + pixely / 2 %f>
|fs For i = 0 To ny - 1 3| '#n[3 xpos = -detx - pixelx / 2 cwWSNm| ypos = ypos - pixely iI@Gyq= -2jBs-z EnableTextPrinting( True ) Zc\h15+P Print i 7~l EnableTextPrinting( False ) Yx}"> ;\ #nf%ojh Dss/>!
mN For j = 0 To nx - 1 >gZk
581/ Fb{`a[& xpos = xpos + pixelx 3VRZM@i $6&GAJe 'shift source !Nxn[^[?. LockOperationUpdates srcnode, True E_![`9i GetOperation srcnode, 1, op \`Ph=lJO op.val1 = xpos Rqb{)L
X* op.val2 = ypos hA1gkEM2o SetOperation srcnode, 1, op x+*L5$;h LockOperationUpdates srcnode, False U ygw*+ n"<GJ.{ 'raytrace y%IG:kZ, DeleteRays 9*TS90>a CreateSource srcnode Xx y
Bg!R TraceExisting 'draw fdq^!MWTi hDD~,/yVxs 'radiometry |!xfIR>=F For k = 0 To GetEntityCount()-1 H6PXx If IsSurface( k ) Then Z*vpQBbu temp = AuxDataGetData( k, "temperature" ) 1y)$[e
emiss = AuxDataGetData( k, "emissivity" ) '[=yfh If ( temp <> 0 And emiss <> 0 ) Then gM;) ProjSolidAngleByPi = GetSurfIncidentPower( k ) EDgob^> frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) RZ<+AX9R irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi hV>4D&< End If BudWbZ5>Ep JW% /^' End If ><#2O An8%7xa7 Next k uku}Mr"p =_?pOq Next j
ENYF0wW %g]$Vfpy Next i "3Xv%U9@ EnableTextPrinting( True ) :uIi
? 7$1fy0f[l 'write out file fZw9zqg fullfilepath = CurDir() & "\" & fname 94p:| 5@ Open fullfilepath For Output As #1 N)vk0IM! Print #1, "GRID " & nx & " " & ny M ~ i+F0 Print #1, "1e+308" e0~sUVYf Print #1, pixelx & " " & pixely XYK1-m}2 Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 zU4V^N' ax72e hL} maxRow = nx - 1 Mf;|z0UX maxCol = ny - 1 j5,^9' For rowNum = 0 To maxRow ' begin loop over rows (constant X) c9*1$~(v0I row = "" 4[LLnF-- For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) 6=G~6Qu row = row & irrad(colNum,rowNum) & " " ' append column data to row string , N@Yk. Next colNum ' end loop over columns 8z."X$ !y
qa?\v9 Print #1, row S/nj5Lh $KwI}>E4 Next rowNum ' end loop over rows n2xLgK= Close #1 &*G5J7%w xb+RRTgj Print "File written: " & fullfilepath `?zg3GD_ Print "All done!!" c%AFo]H End Sub q3AJwELXw +{")E) 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: (xZr ]v ]U PJxak3 .pS&0gBo\ 找到Tools工具,点击Open plot files in 3D chart并找到该文件 lC'{QUC E[|s>Xv~ YGq=8p7.R 打开后,选择二维平面图: b!'l\~`{i Ow
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