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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。 yXSFjcoB OGK}EI 成像示意图 WI-&x
' 首先我们建立十字元件命名为Target i,>khc AL9chYP}/ 创建方法: (;T^8mI2 7 HIeJ 面1 : hs^zTZ_ 面型:plane >AVVEv18 材料:Air &]`(v}`] 孔径:X=1.5, Y=6,Z=0.075,形状选择Box 3EJj9}#x"' [pbo4e,4O t{ xf:~B 辅助数据: ;_c;0) 首先在第一行输入temperature :300K, ojcA<60
' emissivity:0.1; 9IjIIM2y S\:P-&dC Q# ~Q=T'< 面2 : mk.9OhYY 面型:plane 4 ezEW|S 材料:Air q]T1dz? 孔径:X=1.5, Y=6,Z=0.075,形状选择Box _Gn2o2T Q-_N2W? E{XH?_xo 位置坐标:绕Z轴旋转90度, .c8g:WB< ?qPo=~y01
~ksi</s 辅助数据: my(2;IJ#{ mWoAO@}Y 首先在第一行输入temperature :300K,emissivity: 0.1; /)YNs7gR 2;k*@k-t ")SFi^] Target 元件距离坐标原点-161mm; vx>b^tJKC 94h]~GqNi -.1y(k^4E 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 gwLf ' `F-/QX[: J?V? R 探测器参数设定: i6^twK)j ( /=f6^} 在菜单栏中选择Create/Element Primitive /plane A
9( x {#ZlM nEJq_ V3&RJ k=b PC~Y8,A|.t y&6FybIz 元件半径为20mm*20,mm,距离坐标原点200mm。 WffQ :L? NSxoF3 光源创建: !\-{D$E?H `.E[}W 光源类型选择为任意平面,光源半角设定为15度。 HJ9Kz^TnC *w|:~g Lf16j*}-Q 我们将光源设定在探测器位置上,具体的原理解释请见本章第二部分。 Zq^At+8+ *1uKr9 我们在位置选项又设定一行的目的是通过脚本自动控制光源在探测器平面不同划分区域内不同位置处追迹光线。 o)h_H;
CuFSeRe @3) (BpFe 功率数值设定为:P=sin2(theta) theta为光源半角15度。我们为什么要这么设定,在第二部分会给出详细的公式推导。 {:Orn%Q &q3"g*q 创建分析面: E%yNa]\P @Pm>sY}d<I qB~rQPa 到这里元件参数设定完成,现在我们设定元件的光学属性,在前面我们分别对第一和第二面设定的温度和发射系数,散射属性我们设定为黑朗伯,4%的散射。并分别赋予到面一和面二。 +NeOSQSj x6Bu F_. d?ex,f. 到此,所有的光学结构和属性设定完成,通过光线追迹我们可以查看光线是否可以穿过元件。 lNz7u:U3 b+%f+zz*h FRED在探测器上穿过多个像素点迭代来创建热图 PY_u/<u RmI]1S_= FRED具有一个内置的可编译的Basic脚本语言。从Visual Basic脚本语言里,几乎所有用户图形界面(GUI)命令是可用这里的。FRED同样具有自动的客户端和服务器能力,它可以被调用和并调用其他可启动程序,如Excel。因此可以在探测器像素点上定义多个离轴光源,及在FRED Basic脚本语言里的For Next loops语句沿着探测器像素点向上和向下扫描来反向追迹光线,这样可以使用三维图表查看器(Tools/Open plot files in 3D chart)调用和查看数据。 uW=k K0E 将如下的代码放置在树形文件夹 Embedded Scripts, *T-<|zQ tClg*A;|B HguT"%iv 打开后清空里面的内容,此脚本为通用脚本适用于一切可热成像的应用。 QqDC4+p" Ok|*!!T 绿色字体为说明文字, y<?kzt |N4.u
_hM '#Language "WWB-COM" {Bk[rCl 'script for calculating thermal image map n4s+>|\M 'edited rnp 4 november 2005 ?ME6+Z\ +O"!qAiK 'declarations Z
8S\@I Dim op As T_OPERATION ,-$LmECg Dim trm As T_TRIMVOLUME zvvhFN2s Dim irrad(32,32) As Double 'make consistent with sampling q['Euy Dim temp As Double ot,jp|N>f~ Dim emiss As Double EOIN^4V" Dim fname As String, fullfilepath As String :WjpzgPuN \MsTB|Z 'Option Explicit +Jlay1U& yg`j-9[8 Sub Main 68NYIyTW9 'USER INPUTS ~d
o9;8v nx = 31 S{Kiy#ltWc ny = 31 FTH|9OP
numRays = 1000 ZXu>,Jy minWave = 7 'microns [^R^8k maxWave = 11 'microns )#EGTRdo sigma = 5.67e-14 'watts/mm^2/deg k^4 QHDXW1+|^ fname = "teapotimage.dat" &x=.$76 v6[!o<@"a Print "" \<&m&%Zs Print "THERMAL IMAGE CALCULATION" cW~}:;D4 g9m-TkNk detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 H~oail{EQ rK@8/?y5 Print "found detector array at node " & detnode P!$Zx)T x5|I srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 O#n8=B4 Bz_^~b7 Print "found differential detector area at node " & srcnode _A M*@|p, r [9x GetTrimVolume detnode, trm &X`C%h detx = trm.xSemiApe $CxKuB( dety = trm.ySemiApe teOe#* area = 4 * detx * dety <m!h&_eg Print "detector array semiaperture dimensions are " & detx & " by " & dety A;G;^s Print "sampling is " & nx & " by " & ny QsGiclU Vmc5IPd{\ 'reset differential detector area dimensions to be consistent with sampling TIx|L pixelx = 2 * detx / nx )bA;?i pixely = 2 * dety / ny &qLf@1AD SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False 5uGqX" Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2
#c!*</ x[4`fM.m* 'reset the source power NWP5If|'X SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) hMzs*gK Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" OGBHos LZ\q37UV 'zero out irradiance array HvUxsdT For i = 0 To ny - 1 Q;MT"=RW For j = 0 To nx - 1 `0rd26Qro irrad(i,j) = 0.0 Jx_cf9{ Next j c4!^nk] Next i g(nPQOs$u TSA,WP\ 'main loop LU+3{O5y EnableTextPrinting( False ) <i<J^-W 2:*w~|6>}5 ypos = dety + pixely / 2 Y4%:7mw~= For i = 0 To ny - 1 Pih tf4i xpos = -detx - pixelx / 2 m9)p-1y@5 ypos = ypos - pixely
7;u
e `+`Z7 EnableTextPrinting( True ) '#!
gh? Print i +U:$(UV'A EnableTextPrinting( False ) s|@6S8E )W|w C# *RT>`,t/ For j = 0 To nx - 1 gep;{G} _t:$XJ`bTk xpos = xpos + pixelx 9K/HO!z zFfoqb#*g 'shift source agkA}O LockOperationUpdates srcnode, True yH7F''O7 GetOperation srcnode, 1, op X$%' op.val1 = xpos 1m+p;T$ op.val2 = ypos $r@
=*( SetOperation srcnode, 1, op z,|r*\dw LockOperationUpdates srcnode, False YgKZ#?* H/,gro 'raytrace R{RwTN< DeleteRays ;V@WtZv CreateSource srcnode :WQ^j!9' TraceExisting 'draw ~a%Z;Aj 7ByTnYe~S 'radiometry g$n7CXoT For k = 0 To GetEntityCount()-1 l|xZk4@_uE If IsSurface( k ) Then F8hw#!Aq temp = AuxDataGetData( k, "temperature" ) aF8fqu\ emiss = AuxDataGetData( k, "emissivity" ) hhb?6]Z/ If ( temp <> 0 And emiss <> 0 ) Then 9Kr+\F ProjSolidAngleByPi = GetSurfIncidentPower( k ) b6W2^tr- frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) hp8%.V$f irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi
rL/H2[d End If r/& sub"X uC.K<jD% End If ekI2icD j0Bu-sO$w Next k "~E[)^ANxD
zG+R5: Next j dG@"!!, L Y6;.d$J Next i 1D16 EnableTextPrinting( True ) N03G>fZ F1 iGMf-8 'write out file #G|qD fullfilepath = CurDir() & "\" & fname Tskq)NU Open fullfilepath For Output As #1 )q0. 0<f Print #1, "GRID " & nx & " " & ny ]'5;|xc9$/ Print #1, "1e+308" MzPzqm< Print #1, pixelx & " " & pixely AGH|"EWG Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 u7bLZU 0 rX*H)3F maxRow = nx - 1 TqNadHQ maxCol = ny - 1 0_k'.5l% For rowNum = 0 To maxRow ' begin loop over rows (constant X) =PUt&`1.a row = "" ay1YOfa* For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) /V=24\1Ky row = row & irrad(colNum,rowNum) & " " ' append column data to row string ~CtL9m3tO Next colNum ' end loop over columns J%V-Q>L gWrgnlq Print #1, row sBu=e7 "~=mG--I Next rowNum ' end loop over rows !(qsD+ Close #1 CL)lq)1( u4.ngjJ Print "File written: " & fullfilepath h\7fp. Print "All done!!" f}Np/ End Sub 76>7=#m0u' Ad:TYpLD 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: FvN<<&B J~B<7O<?!1 {*[\'!d--. 找到Tools工具,点击Open plot files in 3D chart并找到该文件 y'(Ne=y Gq_-Val]" ]E_h 打开后,选择二维平面图: S5KEXnjm HODz*pI
QQ:2987619807 qzI&<4
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