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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。 /}9)ZYMx a[p$e?gka 成像示意图 8*Ty`G&v 首先我们建立十字元件命名为Target Q" r y@
(I AG><5 } 创建方法: U9jdb9 | xxA^A 面1 : 3^5h:OaT 面型:plane 6-FM<@H{ 材料:Air WtO@Kf:3GH 孔径:X=1.5, Y=6,Z=0.075,形状选择Box 8:[ l1d86 \>|| y?U@F/^}N 辅助数据: ae" o|Q 首先在第一行输入temperature :300K, 29cx( emissivity:0.1; L7R!, sDAP'& -fp/3- 面2 : EP^qj j@M 面型:plane cg_ " }]Y1 材料:Air `@ny!S|1/ 孔径:X=1.5, Y=6,Z=0.075,形状选择Box Rh#`AM`)j 9WI5\`*" ; tQ(l%! 位置坐标:绕Z轴旋转90度, a~?B/
g&_ p=3t!3 R+z'6&/ =I 辅助数据: Kj)sL0 Mdq|:^px 首先在第一行输入temperature :300K,emissivity: 0.1; #<X4RJ |=07n K2 )O5@R Target 元件距离坐标原点-161mm; 8!YQ9T [ 4>OS2b`.; fefy`J 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 vKWi?}1 kR3wbA KDP"z 探测器参数设定: g9CedD%40 pU'${Z~b 在菜单栏中选择Create/Element Primitive /plane W?"l6s P&=YLL<W { ^^5FE)% ;Yv{)@'Bc 0U:X[2|) [oXSjLQm[ 元件半径为20mm*20,mm,距离坐标原点200mm。 `e fiX^ p(nO~I2E 光源创建:
+ K`.ck k`&FyN^) 光源类型选择为任意平面,光源半角设定为15度。 TGU7o:2 7VG*Wu 1zCu1'Wv 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。 egBk7@Ko j}d):3! 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。 FPkk\[EU pJs`/ dQ~GE}[ 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。 ZZZ`@pXm; tQRbNY#}Z 创建分析面: ~5h4 Gy) l1|*(%p?X *xmC`oP 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。 ]f?r@U'AS| jSM`bE+" 4w'&:k47 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。 lZ)6d-vK [[]yQ
" FRED在探测器上穿过多个像素点迭代来创建热图 Pz[UAJ ms;zC/ 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。 r]&sXKDc 将如下的代码放置在树形文件夹 Embedded Scripts, ^;h\#S[% i7PS=]TK\ 4H;7GNu 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。 f3qR7%X? Y0kcxpK/ 绿色字体为说明文字, DTuco9yr[ lR7;{zlSf' '#Language "WWB-COM" 5'+g[eNyBV 'script for calculating thermal image map W1<*9O 'edited rnp 4 november 2005 JP0aNu {D^
)%{ 'declarations GM9[ 0+u; Dim op As T_OPERATION rp
dv{CUp7 Dim trm As T_TRIMVOLUME b;d7mh4 Dim irrad(32,32) As Double 'make consistent with sampling u{&=$[; Dim temp As Double DJ7ak>"R
Dim emiss As Double re/u3\S Dim fname As String, fullfilepath As String A'7Y{oPHX p>\[[Md 'Option Explicit <*z'sUh+} QxaMe8( Sub Main v;G/8>GRy 'USER INPUTS 6Iv};f"Y nx = 31 IKnf ny = 31 OmZZTeGg1s numRays = 1000 X]2Ib'( minWave = 7 'microns HJJ)D E7; maxWave = 11 'microns x1`(Z|RJ sigma = 5.67e-14 'watts/mm^2/deg k^4 9<y{:{i fname = "teapotimage.dat" K$D+TI) Lg,ObVt! Print "" rA8NE> Print "THERMAL IMAGE CALCULATION" T"3LO[j+ w5)KWeGa detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 sx;/xIU| Iurz?dt4w Print "found detector array at node " & detnode )
?kbHm /6[vF)& srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 2?Ryk`2i) 3hBYx@jTO Print "found differential detector area at node " & srcnode NX(IX6^y *^7^g!=z2 GetTrimVolume detnode, trm }id)~h_@ detx = trm.xSemiApe i !sVQ(: dety = trm.ySemiApe F?MVQ!K* area = 4 * detx * dety ? eI)m Print "detector array semiaperture dimensions are " & detx & " by " & dety u81F^72U Print "sampling is " & nx & " by " & ny y]obO|AH (QqeMG,Y 'reset differential detector area dimensions to be consistent with sampling ]
s 2ec pixelx = 2 * detx / nx pX3E l$p pixely = 2 * dety / ny y
c<%f SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False ]Hi1^Y< Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 AVU'rsXA i@WO>+iB 'reset the source power !@Vj&>mH$ SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) ak3WER|f# Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" qkc,93B3 S\sy^Kt~4: 'zero out irradiance array &1=,?s]& For i = 0 To ny - 1 xOg|<Nnl For j = 0 To nx - 1 gMq; irrad(i,j) = 0.0 ~e,K Next j ;UX9Em Next i {[NQD3=+F -~\7ZRP8 'main loop :18}$ EnableTextPrinting( False ) U:MZN[Cc[ >tL"8@z9 ypos = dety + pixely / 2 s:,fXg25J For i = 0 To ny - 1 =yqg,w&Q xpos = -detx - pixelx / 2 kaR55 ypos = ypos - pixely Cx(HsJ!, E6G;fPd= E EnableTextPrinting( True ) yfFe%8w_vw Print i C5Fq%y{$. EnableTextPrinting( False ) 93w$ck},?G 4T&Jlu?: 2e ~RM2PQ For j = 0 To nx - 1 EOqV5$+ _Bn8i( xpos = xpos + pixelx D,-L!P *x2u 'shift source \4 t;{_ LockOperationUpdates srcnode, True >i61+uzEd+ GetOperation srcnode, 1, op Ai)Q(] op.val1 = xpos x5U;i op.val2 = ypos .&^M
Z8 SetOperation srcnode, 1, op _A]~`/0;` LockOperationUpdates srcnode, False =5%}CbUU)4 /~<Przw 'raytrace g8"{smP/ DeleteRays =*y{y)B^g CreateSource srcnode Xa>c]j TraceExisting 'draw ?f:\&+.& W`wT0kP?*] 'radiometry 1EV0Y]T1 For k = 0 To GetEntityCount()-1 6ESS>I"su If IsSurface( k ) Then CFY4PuI"! temp = AuxDataGetData( k, "temperature" ) cetlr emiss = AuxDataGetData( k, "emissivity" ) L#IY6t If ( temp <> 0 And emiss <> 0 ) Then tE=$# ProjSolidAngleByPi = GetSurfIncidentPower( k ) yaX%<KBa\ frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) Gh'{O/F4* irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi zq#gf End If *q Ins/@ `5~<) End If Qcs0w( a9nXh6 Next k d
k|X&)xTJ 5hiuBf< Next j jLul:*
L 1;MUemnx` Next i JlH5 <:#PN EnableTextPrinting( True ) -f(<2i jin?;v 'write out file `jDmbD
+= fullfilepath = CurDir() & "\" & fname -32.g\] Open fullfilepath For Output As #1 :4238J8 Print #1, "GRID " & nx & " " & ny T=cb:PD{% Print #1, "1e+308" sE(mK<{pk Print #1, pixelx & " " & pixely 3Q+THg3~? Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 `&/ zOMp RAEiIf!3 maxRow = nx - 1 04z2gAo maxCol = ny - 1 GwlAEh P For rowNum = 0 To maxRow ' begin loop over rows (constant X) oX1{~lDJl row = "" S#7.y~e\ For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) }KrZ6cG9# row = row & irrad(colNum,rowNum) & " " ' append column data to row string RK=YFE 0 Next colNum ' end loop over columns |<7nf7 5c} LZ~$=< Print #1, row <.6$zcW K<Y-/t Next rowNum ' end loop over rows af7\2g3* Close #1 ( KG>lTdN DfP
vi1 Print "File written: " & fullfilepath tZY(r
{ Print "All done!!" PR1% End Sub #EU x1II QGd"Z lQ 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: 5 %aT W?auY_+P <^jW 找到Tools工具,点击Open plot files in 3D chart并找到该文件 jvos)$;L- [kq+a]q %"RgW\s[R 打开后,选择二维平面图: Wj.
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