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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。 O=}d:yZb! Y+{jG(rg.F 成像示意图 q!{>Nlk 首先我们建立十字元件命名为Target XD Q<28^ Gn^m 541 创建方法: o(yyj'=( <"yL(s^u" 面1 : V[0
ZNT& 面型:plane M9Xq0BBu 材料:Air uC%mGZa 孔径:X=1.5, Y=6,Z=0.075,形状选择Box ART0o7B ~l}\K10L* W'6sY@0m 辅助数据: L*cP8v4 首先在第一行输入temperature :300K, 06z+xxCo emissivity:0.1; hdwF; uH)?`I\zrd z9E*1B+ 面2 : tLcw?aB 面型:plane MzH'<`;BP 材料:Air [qU`}S2 孔径:X=1.5, Y=6,Z=0.075,形状选择Box x@3cZd0j# OZEbs 7 $'<FPbUtD} 位置坐标:绕Z轴旋转90度, ]QGo(+ Va A.J @VQ<X4Za 辅助数据: L{oG'aK4 =1y~Qlu 首先在第一行输入temperature :300K,emissivity: 0.1; n=?wX#rEC# /=g/{&3[a> nl~Z,Y$ Target 元件距离坐标原点-161mm; R_b4S%jhx <[K3Prf C Bru] ;%Qg% 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 `g<0FQA Mh
MXn;VKj WF:4p]0~) 探测器参数设定: \/b[V3<" ]Ljb&*IEj 在菜单栏中选择Create/Element Primitive /plane bu-6}T+ n6G&c4g<" eAStpG"* Tv6y+l Yr>0Qg], ]E)\>Jb 元件半径为20mm*20,mm,距离坐标原点200mm。 w[ $oH^7 `z$P,^g` 光源创建: t+K1ArQc d2TIG<6/ 光源类型选择为任意平面,光源半角设定为15度。 Uq~b4 X$ 3D^cPkX 5 D=r7 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。 T8&eaAoo Q @[gj:w 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。 zszmG^W{ }9glr]= jo3(\Bq 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。 OMM5ALc(F w=3
j'y{f 创建分析面: yz,0
S' U ?1zGs2Qs pe<T"[X 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。 eoXbZ V.6pfL *?$M=tH 到此,所有的光学结构和属性设定完成,通过光线追迹我们可以查看光线是否可以穿过元件。 5SZa,+] "Q:h[) a FRED在探测器上穿过多个像素点迭代来创建热图 ~ch%mI~ Ke=+D'= FRED具有一个内置的可编译的Basic脚本语言。从Visual Basic脚本语言里,几乎所有用户图形界面(GUI)命令是可用这里的。FRED同样具有自动的客户端和服务器能力,它可以被调用和并调用其他可启动程序,如Excel。因此可以在探测器像素点上定义多个离轴光源,及在FRED Basic脚本语言里的For Next loops语句沿着探测器像素点向上和向下扫描来反向追迹光线,这样可以使用三维图表查看器(Tools/Open plot files in 3D chart)调用和查看数据。 9gglyoZ% 将如下的代码放置在树形文件夹 Embedded Scripts, wX_~H*m? t&NpC;>v B?yjU[/R 打开后清空里面的内容,此脚本为通用脚本适用于一切可热成像的应用。 M< .1U?_# NqGSoOjIO2 绿色字体为说明文字, I>##iiKN Od^Sr4C '#Language "WWB-COM" Z`86YYGK 'script for calculating thermal image map [S8*b^t4 'edited rnp 4 november 2005 S4?WR+:h FD&^nJ_{ 'declarations qVI0?B
x Dim op As T_OPERATION JZ~wacDd Dim trm As T_TRIMVOLUME Yi)s=Q : Dim irrad(32,32) As Double 'make consistent with sampling 8e^u KYR< Dim temp As Double Z[ &d2' Dim emiss As Double ekU%^R< Dim fname As String, fullfilepath As String Jz3,vVfQ: M] +.xo+A 'Option Explicit vU5}E\Ny ;<thEWH;Y Sub Main wW/q#kc 'USER INPUTS }S3 oX$ nx = 31 F3]VSI6^E, ny = 31 "^!y>]j#A numRays = 1000 pPag@L minWave = 7 'microns k`A39ln7wu maxWave = 11 'microns (x?Tjyzw sigma = 5.67e-14 'watts/mm^2/deg k^4 (vX<Bh fname = "teapotimage.dat" U djYRfk u"m(a:jQ Print "" |$e'yx6j Print "THERMAL IMAGE CALCULATION" jWV}Ua -ucgET` detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 PB7-`uz 3-, W?
"aC Print "found detector array at node " & detnode ;,e16^\' & ?FjnG_Uz`D srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 y22DBB8 bk;uKV+< Print "found differential detector area at node " & srcnode #.[eZ[ _H@ATut GetTrimVolume detnode, trm 5ya^k{`+ZO detx = trm.xSemiApe |2@*?o"ll dety = trm.ySemiApe AO]cnhC area = 4 * detx * dety 5E"^>z Print "detector array semiaperture dimensions are " & detx & " by " & dety Ie(.T2K Print "sampling is " & nx & " by " & ny P\<:.8@$S rUmP_ 'reset differential detector area dimensions to be consistent with sampling \q4r/SbgW pixelx = 2 * detx / nx noL9@It0 pixely = 2 * dety / ny !U>WAD9 SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False dFDf/tH Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 #0Y_!'j <F;+A{M) 'reset the source power # Q,EL73; SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) ' h<( Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" 0V21_".S `>`b;A4 'zero out irradiance array ^V#,iO9.- For i = 0 To ny - 1 !|i #g$ For j = 0 To nx - 1 q~[sKAh irrad(i,j) = 0.0 ~IjID Next j \`xlD&F@U Next i b=_k)h+l F.5fasdX'
'main loop DyiJ4m}kh EnableTextPrinting( False ) ^bfZd wW1\{<hgr ypos = dety + pixely / 2 dzPewOre* For i = 0 To ny - 1 3B
'j?+A xpos = -detx - pixelx / 2 3^~J;U!3 ypos = ypos - pixely _"L6mcI6 p/VVb% EnableTextPrinting( True ) |g)>6+?]W Print i $*iovam>^] EnableTextPrinting( False ) vno/V#e$WX O^row1D_ rf:H$\yw For j = 0 To nx - 1 B 5|\<CF JHvev,#4 xpos = xpos + pixelx cPNc$^Y [K\b"^=< 'shift source ?SElJ?Z LockOperationUpdates srcnode, True 7<;oz30G!L GetOperation srcnode, 1, op URrx7F98 op.val1 = xpos ?X6}+ op.val2 = ypos -Z$u[L [c SetOperation srcnode, 1, op ]kTxVe LockOperationUpdates srcnode, False ybE2N #IM.7`I 'raytrace tLa%8@;'$ DeleteRays ~Ss,he]Er CreateSource srcnode jJNCNH*0 TraceExisting 'draw 35e{{Gn)v ^zQI_ydG 'radiometry yvoz 3_! For k = 0 To GetEntityCount()-1 %}VH5s9\ If IsSurface( k ) Then p ZTrh&I] temp = AuxDataGetData( k, "temperature" ) ($[+dR emiss = AuxDataGetData( k, "emissivity" ) ,Q7;(&x~ If ( temp <> 0 And emiss <> 0 ) Then @|DQZt ProjSolidAngleByPi = GetSurfIncidentPower( k ) e@ZM&iR frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) mA+:)?e5~ irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi ud$-A End If 3>@VPMi ^.!jD+=I End If *??lwvJp +K`A2&F9 Next k &~H ed_ K8&;B)VT> Next j X&?s:A d9M[]{ Next i ?e<2'\5v EnableTextPrinting( True ) 0>N6.itOz =oq8SL?bJ* 'write out file Pp tuXq%U fullfilepath = CurDir() & "\" & fname KaNs>[a8 Open fullfilepath For Output As #1 ~!
-JN}H m Print #1, "GRID " & nx & " " & ny R;c9)>8L Print #1, "1e+308" ?zf3Fn2y Print #1, pixelx & " " & pixely ?Z7QD8N
Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 7*{f*({
-9i7Ja maxRow = nx - 1 nm,LKS7 maxCol = ny - 1 tO3R&"{ For rowNum = 0 To maxRow ' begin loop over rows (constant X) F`QViZ'n># row = "" k_=yb^6[U For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) - |g"q| row = row & irrad(colNum,rowNum) & " " ' append column data to row string 5o dT\>Sn Next colNum ' end loop over columns !ka* rd rQVX^ Print #1, row 73D<wMgZF Lz'VQO1U= Next rowNum ' end loop over rows '|zrzU= Close #1 0<-E)\:[g bItcF$#!!! Print "File written: " & fullfilepath zl|z4j'Irc Print "All done!!" J{1H$[W~} End Sub -V|"T+U w#|L8VAh 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: rR> X< "s(~k E5bVCAz 找到Tools工具,点击Open plot files in 3D chart并找到该文件 }|kFHodo l?U=s7s0? AAevN3a#nI 打开后,选择二维平面图: :hX[8u \g39>;iR
QQ:2987619807 <h7cQ
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