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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。 ](]*]a4ss R (t!xf 成像示意图 Wdei`u[ 首先我们建立十字元件命名为Target XCKY
xv& n$nne6|O 创建方法: |^
2rtI ]JkpR aP$ 面1 : _G_ &Me0 面型:plane l2z`<2mp 材料:Air de*,MkZN 孔径:X=1.5, Y=6,Z=0.075,形状选择Box ;a#}fX wjN`EF5$}& bjU 2UcI"< 辅助数据: hWl""66+5 首先在第一行输入temperature :300K, 6GvhEulYR emissivity:0.1; ;5,`Jpca 2&zn^\%" ?6_"nT*} 面2 : 6R3"L]J 面型:plane S7@ZtFf 材料:Air t;Fbt("]: 孔径:X=1.5, Y=6,Z=0.075,形状选择Box O('i*o4!} R^mu%dw)(% 7I @9v=xV 位置坐标:绕Z轴旋转90度, Rfkzv=<"X ux"D
]P gOBj0P8s|} 辅助数据: l5":[C$ c,b`N0dOKL 首先在第一行输入temperature :300K,emissivity: 0.1; ==PQ-Ia 6qz!M ?qq!%4mTB Target 元件距离坐标原点-161mm; E.5*Jr=J R#[QoyJ F&nMI:h7 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 0ECO/EuCg u&l>cJ' 1I:"0("} 探测器参数设定: 5~<a>> dQWA"6?i 在菜单栏中选择Create/Element Primitive /plane KxgR5#:i" 5JXzfc9rL C+Fh$ A{{q'zb! sqMNon`5 Gdc~Lh 元件半径为20mm*20,mm,距离坐标原点200mm。 SevfxR )Rm
'YmO 光源创建: .:r2BgL 0NuL9 光源类型选择为任意平面,光源半角设定为15度。 ]HZa:aPY Uy_}@50"l e&FX7dsyy 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。 g-{<v4 NGI 5~kW-x 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。 / ut~jf` %BKR} ECE{xoc 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。 /v|68x6 !4b;>y=m 创建分析面: I/e2, x1 &b@u JQ{zWJlt 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。 an[3vKb edImrm1f C&d"#I 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。 Ilt L@]e 6S+K*/w FRED在探测器上穿过多个像素点迭代来创建热图 dg'CHxU }77=<N br 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。 2gC&R1H 将如下的代码放置在树形文件夹 Embedded Scripts, ]B-$p p 8n. "5,P 4
L~;>]7 打开后清空里面的内容,此脚本为通用脚本适用于一切可热成像的应用。 DbNi;m J:TI>*tn 绿色字体为说明文字, w7*b}D@65\ ~gLEh tW '#Language "WWB-COM" "DcueU#! 'script for calculating thermal image map _QOOx+%*5 'edited rnp 4 november 2005 0u&?Zy9& G+QNg.pH 'declarations t$PnQ@xu Dim op As T_OPERATION ;]#4p8lh+ Dim trm As T_TRIMVOLUME p*W ZY=Q Dim irrad(32,32) As Double 'make consistent with sampling Gad2EEZ%0 Dim temp As Double 0F0(]7g^ Dim emiss As Double ~"<VUJ=Ly: Dim fname As String, fullfilepath As String Ppo^qb Pu\DYP:( 'Option Explicit
j5VRv$P ,h(f\h(9 Sub Main $X<<JnsK 'USER INPUTS MF`k~)bDV nx = 31 >-@{vyoOy ny = 31 3
Q%k(, numRays = 1000 HV.|Eh_7 minWave = 7 'microns tx&U"] maxWave = 11 'microns Mpl,}Q!c sigma = 5.67e-14 'watts/mm^2/deg k^4 JjTzq2'% fname = "teapotimage.dat" J-%PyvK$? Z :i"|; Print "" r|H!s, Print "THERMAL IMAGE CALCULATION" %_J/&{6G $j4?'-i=e detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 <"|<)BGeI ZD] '$ Print "found detector array at node " & detnode ]!Aze^7; WSB|-Qj}W srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 d# ?*62 }${ZI Print "found differential detector area at node " & srcnode 2T2#HP -_f0AfU/a GetTrimVolume detnode, trm \,IDLXqp detx = trm.xSemiApe JU2' ~chh dety = trm.ySemiApe aFc'_FrQ area = 4 * detx * dety /a/uS3& Print "detector array semiaperture dimensions are " & detx & " by " & dety S?z j&XY3 Print "sampling is " & nx & " by " & ny *[5#g3
T9;o.f S 'reset differential detector area dimensions to be consistent with sampling _itN.^ pixelx = 2 * detx / nx =<W[dV=W pixely = 2 * dety / ny pS)X\Xyw SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False 89e.\EH Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 SD.*G'N&2f l0bT_?LhK 'reset the source power $bC!T SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) C5z Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" ,`2xfVa- 3eDx@8N
} 'zero out irradiance array -a^sX%|Bl For i = 0 To ny - 1 OZ]3OL, For j = 0 To nx - 1 e5\1k#@
irrad(i,j) = 0.0 CvSG!l.6f< Next j Vm8_
!$F Next i l:C0:m% J0) WRn"h 'main loop L=Jk"qWV0 EnableTextPrinting( False ) YG+Yb{^" 0`Qs=R`OM ypos = dety + pixely / 2 aj-uk(r For i = 0 To ny - 1 ',ybHW%D%i xpos = -detx - pixelx / 2 jQlK-U=oi ypos = ypos - pixely u=i^F| MZF ;k$R EnableTextPrinting( True ) s OHAW*+ Print i /PuWJPy; EnableTextPrinting( False ) %+JTQy Iur} ZAz WC&Ltw8 For j = 0 To nx - 1 c oz}VMp BPs
& xpos = xpos + pixelx WD1$"}R Y]Nab0R& 'shift source /9#jv]C: LockOperationUpdates srcnode, True _C#()# GetOperation srcnode, 1, op KT?s\w op.val1 = xpos QlXF:Gx"= op.val2 = ypos m1Z8SM+ SetOperation srcnode, 1, op bL[W.O0 LockOperationUpdates srcnode, False $1
\!Oe[i ! \Kh\ raytrace j_<n~ri- DeleteRays 3&2q\]Y, CreateSource srcnode \ku{-^7 TraceExisting 'draw Q9V4-MC9 6$.Xj\zl 'radiometry WU@,1.F: For k = 0 To GetEntityCount()-1 ^>28>!"1 If IsSurface( k ) Then
';V+~pi temp = AuxDataGetData( k, "temperature" ) 6Ky"4\e emiss = AuxDataGetData( k, "emissivity" ) wd0ACF If ( temp <> 0 And emiss <> 0 ) Then ];]EK6dzG ProjSolidAngleByPi = GetSurfIncidentPower( k ) a'~y'6 frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) m$: a|'mS irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi A|-\C$ End If $KFWV2P 5!%/j,? End If Q{-r4n|b $ wB Next k *(IO<KAg8 oOz6Er[KO Next j e.H"!X!0#H (#Aq*2Z. Next i U.x.gZRo[ EnableTextPrinting( True ) l<6/ADuS Uij$
eBN 'write out file gJ7puN fullfilepath = CurDir() & "\" & fname }y/t~f+ Open fullfilepath For Output As #1 Yl=
|P` Print #1, "GRID " & nx & " " & ny S>Y?QQ3#wp Print #1, "1e+308" ~h.B\Sc]Q Print #1, pixelx & " " & pixely 5+Ut]AL5 Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 ?A>-_B :b-(@a7> maxRow = nx - 1 ~?r6Ax-R maxCol = ny - 1 9-SXu lgu For rowNum = 0 To maxRow ' begin loop over rows (constant X) `,"Jc<R7Z row = "" Kwnu|8 For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) n]!H,Q1,T row = row & irrad(colNum,rowNum) & " " ' append column data to row string -nSqB{s!SD Next colNum ' end loop over columns p04w83 jX bc NYoZ8`
Print #1, row 8uiQm;W nU)f]4q{Ec Next rowNum ' end loop over rows EK^2 2vi$ Close #1 Az[z} r4 Lf9h;z># Print "File written: " & fullfilepath Sm5"Q Print "All done!!" Q1yTDJ(2 End Sub {n'}S( yfrgYA 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: -9EbU7>! [u:_Jqf- fM{Vy])J 找到Tools工具,点击Open plot files in 3D chart并找到该文件 ?9"glzxr E~ kmU{D #96a7K 打开后,选择二维平面图: -6\9B>qa ovp>"VuC
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