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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。
<_>xkQbn2 H-C$Jy)f" 成像示意图 u5O`|I@R 首先我们建立十字元件命名为Target =pnMV"'9 yLgv<%8f 创建方法: $VNj0i. Pr sg9 面1 : VBq|j"o0" 面型:plane Em]2K: 材料:Air iyJx~: 孔径:X=1.5, Y=6,Z=0.075,形状选择Box aESlbH qx f8f k}hTSL 辅助数据: mz m{p(. 首先在第一行输入temperature :300K, ZGsI\3S emissivity:0.1; khQ@DwO*\= wmDO^}>ZP 12o6KVV^x 面2 : r~YxtBZH+ 面型:plane X0 ^~`g 材料:Air oXFo 孔径:X=1.5, Y=6,Z=0.075,形状选择Box SSn{,H8/j KbGz3O'u OVUJiBp 位置坐标:绕Z轴旋转90度, ;km ^ OO$ h1Nd1h@- _@@.VmZL 辅助数据: l>*L
Am5 M97MIku~9 首先在第一行输入temperature :300K,emissivity: 0.1; bR'UhPs-8; A/sM
?!p>_ 21sXCmYR,t Target 元件距离坐标原点-161mm; pg.BOz\'q FjV)QP H bc]SY = 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 gaWJzK
Yc_ _V,bvHWlM {NUI8AL46A 探测器参数设定: 3W3)%[ 5 @MKf$O4K 在菜单栏中选择Create/Element Primitive /plane 8 -YC#& 9?tG?b0 9 GtVcucN jK\AVjn cD ?'lB- Dg}$;PK 元件半径为20mm*20,mm,距离坐标原点200mm。 3YD.Fjz$ (>C$8)v 光源创建: agd^ga3 oH;9s-Be 光源类型选择为任意平面,光源半角设定为15度。 m[qW)N:w a: 2ezxP 88On{Kk.v 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。 yY_#fJj h9kwyhd" 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。 I9L7,~s |ITh2m >Xi/ p$$7u 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。 QxT\_Nej*n j:7AVnt 创建分析面: 3(`P x} +1nzyD_E p^)w$UL}} 到这里元件参数设定完成,现在我们设定元件的光学属性,在前面我们分别对第一和第二面设定的温度和发射系数,散射属性我们设定为黑朗伯,4%的散射。并分别赋予到面一和面二。 a5?Yh<cJ IL{tm0$r H;MyT Vl 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。 t"?)x&dS D"CU J? FRED在探测器上穿过多个像素点迭代来创建热图 NA+7ey6 y I} > 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。 3z% W5[E) 将如下的代码放置在树形文件夹 Embedded Scripts, U+,RP$r@ (qzBy \\p L&0aS: 打开后清空里面的内容,此脚本为通用脚本适用于一切可热成像的应用。 NUFW
SL> 1D1qOg"LE 绿色字体为说明文字, oSLm?Lu ]GBlads '#Language "WWB-COM" Lk.tEuj=82 'script for calculating thermal image map 7Y5.GW\^ 'edited rnp 4 november 2005 @H$Sv p8j*m~4B 'declarations fR]KXfZ Dim op As T_OPERATION [1e]_9)p Dim trm As T_TRIMVOLUME C!U$<_I\2 Dim irrad(32,32) As Double 'make consistent with sampling 6+4SMf3 Dim temp As Double gxmY^"Jy Dim emiss As Double
N@X(YlO Dim fname As String, fullfilepath As String ]CDUHz B.:1fT7lI 'Option Explicit h@dy}Id JCci*F#r Sub Main G5ShheZd 'USER INPUTS EHK+qrym nx = 31 4 %V9 ny = 31 g(i8HU*{q numRays = 1000 ]3~u @6 minWave = 7 'microns
Vfw H: maxWave = 11 'microns 5+UNLvsZ sigma = 5.67e-14 'watts/mm^2/deg k^4 DFvGc`O4 fname = "teapotimage.dat" kH`?^^_yJ t N4-<6 Print "" -Jt36|O Print "THERMAL IMAGE CALCULATION" 'Y/kF1,* b!r%4Ah detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 q:=jv6T# ozKS<< Print "found detector array at node " & detnode >+DMTV[O "]|7%] srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 SgssNv ^7yaMB! Print "found differential detector area at node " & srcnode &G?"I%Vw YFDOp* GetTrimVolume detnode, trm Cbpz Yv32 detx = trm.xSemiApe 7$x%A&] dety = trm.ySemiApe _mJhY0Oc area = 4 * detx * dety ;y-:)7J Print "detector array semiaperture dimensions are " & detx & " by " & dety ?Qx4Z3n Print "sampling is " & nx & " by " & ny 4o"?QV: 7 IJn9 b 'reset differential detector area dimensions to be consistent with sampling : ^U>n{ pixelx = 2 * detx / nx w@Asz9Lq% pixely = 2 * dety / ny UD.ZnE{" SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False qHT73_R Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 -9;?k{{[T 97~>gFU77# 'reset the source power O<#8R\v SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) |6;-P&_n Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" +v$W$s&b-h 4LW~ 'zero out irradiance array \&~YFj B For i = 0 To ny - 1 3hxV`rb For j = 0 To nx - 1 Xvoz4'Gme irrad(i,j) = 0.0 bYZU}Kl;( Next j >; tE.CJH Next i OCq5}%yU&i &SNH1b#>E 'main loop G:y+yE4 EnableTextPrinting( False ) '$eJATtC L62%s[ ypos = dety + pixely / 2 aGfp"NtL For i = 0 To ny - 1 <EcxNj1 xpos = -detx - pixelx / 2 e ;^}@X
ypos = ypos - pixely ,7k-LAA hg#O_4D EnableTextPrinting( True ) pw5{=bD Print i BoST?"&}' EnableTextPrinting( False ) \ q3ui}-9 $rTb'8 AJE$Z0{q For j = 0 To nx - 1 y/kB`Z(Yj NUJ $)qNA xpos = xpos + pixelx L[A?W }/h&`0z` 'shift source :Ocw+X3 LockOperationUpdates srcnode, True t`{T:Tjc GetOperation srcnode, 1, op */_ 'pt op.val1 = xpos 4T;<`{] op.val2 = ypos 3Pgokj
SetOperation srcnode, 1, op m(d|TwG{ LockOperationUpdates srcnode, False d0C _:_ VumM`SH raytrace 3Zl:rYD? DeleteRays %4Qs|CM)m CreateSource srcnode pT3icy!A= TraceExisting 'draw 1r_V$o$ zx,9x*g 'radiometry 'TuaP`]< For k = 0 To GetEntityCount()-1 Pqw<nyC. If IsSurface( k ) Then kU=U u> temp = AuxDataGetData( k, "temperature" ) )J0h\ky emiss = AuxDataGetData( k, "emissivity" ) awvP;F?q| If ( temp <> 0 And emiss <> 0 ) Then T:Ee6I 3l ProjSolidAngleByPi = GetSurfIncidentPower( k ) D4{KU%Xp& frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) Dg"szJ-
irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi esQ$.L End If ^jUw4Dj~-q GN9kCyPK End If XZM@Rys J=gFiBw Next k xy4+
[u tl\<:8pI" Next j J 7 G-qF\ 4OQ,|Wm4G Next i T_=WX_h $ EnableTextPrinting( True ) k.K#i /t j7Ts&;`[* 'write out file yz=X{p1 fullfilepath = CurDir() & "\" & fname t|i<}2 Open fullfilepath For Output As #1 .UNV &R0 Print #1, "GRID " & nx & " " & ny o|xZ?#^h Print #1, "1e+308" |3yG Print #1, pixelx & " " & pixely wT6zeEV~* Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 %lWOW2~R X<Z(,B maxRow = nx - 1 EY<"B2_% maxCol = ny - 1 $7c,<= For rowNum = 0 To maxRow ' begin loop over rows (constant X) 1' v!~*af row = "" z\A
),; For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) KXK5\#+L row = row & irrad(colNum,rowNum) & " " ' append column data to row string `&7tADFB Next colNum ' end loop over columns m,!SDCq 9A} * Print #1, row r{9fm, .#$2,"8 Next rowNum ' end loop over rows FX|&o>S(8 Close #1 c$71~|-[ 25-h5$s Print "File written: " & fullfilepath
w:QO@ Print "All done!!" matna End Sub Z%:>nDZV QAp]cE1ew 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: 9jqsEd-SW /\h*v!: Zx_^P:rL 找到Tools工具,点击Open plot files in 3D chart并找到该文件 7[1|(6$ o!KDeY L*[3rqER 打开后,选择二维平面图: ->{-yh]jv @x+2b0 b
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