| infotek |
2023-04-06 08:38 |
十字元件热成像分析
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。 2[:`w),. V&f3>#n\
成像示意图 EoY570PN 首先我们建立十字元件命名为Target IYj-cm U}{r.MryFG 创建方法: }LE/{]A +V0uHpm 面1 : |E}N8\Gr 面型:plane ",K6zALJ 材料:Air !G 8SEWP 孔径:X=1.5, Y=6,Z=0.075,形状选择Box G.BqT\ o' =6%0pu]0
v8WoV* 辅助数据: Jl4zj>8~ 首先在第一行输入temperature :300K, !u=[/> emissivity:0.1; [NuayO3 ;=E3f^'s ?= fJu\; 面2 : PmTA3aH 面型:plane
"? R$9i 材料:Air R!- RSkB 孔径:X=1.5, Y=6,Z=0.075,形状选择Box `5gcc7b MbJV)*Q $A-b-`X 位置坐标:绕Z轴旋转90度, A\?O5#m:$ K~Xt`
"q%Q[^b 辅助数据: #kxg|G[Ol 2R)Y}*VX 首先在第一行输入temperature :300K,emissivity: 0.1; z
|t0mS$ Q#vur o Z3Viil: Target 元件距离坐标原点-161mm; .m4K ]^m 0BBWuNF.
_p90Zm-3X 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 ,qC_[PUT BG=h1ybz 0/),ylCj 探测器参数设定: Ye,E7A*L WSh+5](: 在菜单栏中选择Create/Element Primitive /plane `s.y!(`q >
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n!IgF8 (h2bxfV~+ 元件半径为20mm*20,mm,距离坐标原点200mm。 rH & ^SNc PInU-"gG 光源创建: fD
V:ueO i8EMjLBUR 光源类型选择为任意平面,光源半角设定为15度。 qex.}[ qQ^]z8g6P 6\(\ 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。 3"cAwU9 _,~/KJp 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。 )5p0fw RW%e% \-c70v63X 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。 o-49o5:1 #W*5=Cf 创建分析面: & [4Gv61 `a @VVBl I 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。 }Vk#w%EJ #_|6yo}
mpN|U(n 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。 \_0nH` `WX @1]m FRED在探测器上穿过多个像素点迭代来创建热图 tP7l
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Py 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。 yX<Sk q 将如下的代码放置在树形文件夹 Embedded Scripts, = gOq
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x2(hp 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。 -NHc~=m m)g:@^$ 绿色字体为说明文字, Y!"LrkC t4~Bn<= '#Language "WWB-COM" 1s/t}J~zZ 'script for calculating thermal image map ):kDWc 'edited rnp 4 november 2005 E2+O-;VN #]cO]
I 'declarations 8<{)|GoqB Dim op As T_OPERATION %?@N-$j Dim trm As T_TRIMVOLUME "NMX>a,( Dim irrad(32,32) As Double 'make consistent with sampling M9M~[[
Dim temp As Double {f<2VeJ Dim emiss As Double <$qe2FtUq Dim fname As String, fullfilepath As String 'M VE5 H0LEK(K 'Option Explicit .T#h5[S2x ko2 ?q Sub Main
W0R<^5_ 'USER INPUTS D!^&*Ia?2 nx = 31 R m>AU= ny = 31 a=]tqV_ numRays = 1000 o]u,<bM$ minWave = 7 'microns GHaD32 maxWave = 11 'microns {mr!E sigma = 5.67e-14 'watts/mm^2/deg k^4 3"!h+dXw fname = "teapotimage.dat" `O/1aW1 #{-B`FAQ Print "" z.P<)[LUc Print "THERMAL IMAGE CALCULATION" R6v~Sy&n! Bi:%}8STH detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 'I^3r~_ t<h[Lb%{T4 Print "found detector array at node " & detnode 4L)#ku$jW ;&RBg+Pr srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 Ymt.>8L =r:(ga Print "found differential detector area at node " & srcnode !8~A` b\^X1eo
GetTrimVolume detnode, trm +&bJhX detx = trm.xSemiApe !Pd@0n4 dety = trm.ySemiApe ktF\f[ area = 4 * detx * dety FabgJu Print "detector array semiaperture dimensions are " & detx & " by " & dety ,yf2kU Print "sampling is " & nx & " by " & ny K@U[x,Sx V7DMn@Ckw 'reset differential detector area dimensions to be consistent with sampling uC$!|I pixelx = 2 * detx / nx @:s(L] pixely = 2 * dety / ny = j)5kY` SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False \D67J239E Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 F)K&a 'rl?'~={p 'reset the source power Q8|
C>$n SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) KJ (|skO Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" 8/gA]I
6=# 7C / ^Gw 'zero out irradiance array b,h@.s For i = 0 To ny - 1 :#nfdvqm For j = 0 To nx - 1 =Vie0TV&h irrad(i,j) = 0.0 y$$|_
l@ Next j h8XoF1wuw Next i -8zdkm8k p ;]Qxh 'main loop emT/5'y EnableTextPrinting( False ) 80_}}op?8 2y`X) ypos = dety + pixely / 2 FHbyL\Q For i = 0 To ny - 1 LS:^K xpos = -detx - pixelx / 2 3kzO
VZ ypos = ypos - pixely SL[ EOz# (4f]<Qt EnableTextPrinting( True ) _9f7@@b Print i &TTvX%T EnableTextPrinting( False ) .~O-
<P# *q-VY[2 7?@ -|{ For j = 0 To nx - 1 #W9{3JGUY EQ [K xpos = xpos + pixelx %p;;aZG MX7Y1 'shift source 4|/}~9/ LockOperationUpdates srcnode, True u u$Jwn!S GetOperation srcnode, 1, op 9y}/ G op.val1 = xpos XOL_vS24 op.val2 = ypos B4/\=MXb SetOperation srcnode, 1, op +v+Dkyf:V LockOperationUpdates srcnode, False Ak kth*p kD46Le++B 'raytrace )vD: DeleteRays 7}L.(Jp9 CreateSource srcnode bn:74,GeyK TraceExisting 'draw Cy\ o{6 uOAd$;h@_Z 'radiometry H0\', X For k = 0 To GetEntityCount()-1 3~%M4( If IsSurface( k ) Then ku)/
8Z`$ temp = AuxDataGetData( k, "temperature" ) "_0sW3rG emiss = AuxDataGetData( k, "emissivity" ) SFjR SMi If ( temp <> 0 And emiss <> 0 ) Then >H5_,A}f ProjSolidAngleByPi = GetSurfIncidentPower( k ) bjBXs;zr@\ frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) h$]nfHi_Q irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi ,`!>.E. End If #Xk/<It l0r^LK$ End If ~^/BAc o'_eLp Next k P>EG;u@. 9^CuSj Next j BsR3$ gI/SA Next i p4uN+D`.U EnableTextPrinting( True ) kl|m @Nxp d@?zCFD 'write out file "
1h~P, fullfilepath = CurDir() & "\" & fname FI @kE19 Open fullfilepath For Output As #1 Et'&}NjI Print #1, "GRID " & nx & " " & ny m~tv{#Y Print #1, "1e+308" ~zoZ{YqP Print #1, pixelx & " " & pixely =)%~QK{Y Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 &hEkm Tdxc%'l maxRow = nx - 1 2;7n0LOs} maxCol = ny - 1 ~
Ofn&[G For rowNum = 0 To maxRow ' begin loop over rows (constant X) jA3xDbM row = "" G[+{[W For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) 5 Nt9'" row = row & irrad(colNum,rowNum) & " " ' append column data to row string h^f?rWD:nz Next colNum ' end loop over columns Ow{NI-^K G%dzJpC(
Print #1, row {>d\ C;YtMY: Next rowNum ' end loop over rows ;?{OX Close #1 L2%npps ;y;UgwAM Print "File written: " & fullfilepath n{!=gR.v. Print "All done!!" 8"ulAx74> End Sub $*j)ey>
eI/@ut}v 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: K7ZRj\(CJv \98|.EG +hIMfhF 找到Tools工具,点击Open plot files in 3D chart并找到该文件 ahR-^^'$ '/fueku D.YT u$T 打开后,选择二维平面图: in>?kbaG+ xgIb4Y%
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