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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。 8F/JOtkGMt AEo 成像示意图 -Q"
N;&'[& 首先我们建立十字元件命名为Target J_d!` Hhe Qq<+QL | 创建方法: "bA8NQIP ~IQw?a.E 面1 : lr9s`>9 面型:plane 0[R7HX-@ 材料:Air /=g$_m@yWI 孔径:X=1.5, Y=6,Z=0.075,形状选择Box !h>aP4ofT C%Fc%}[ aH*5(E] 辅助数据: aK]H(F2# 首先在第一行输入temperature :300K, 6XI$ o,{ emissivity:0.1; kmM->v 7i88iT li&&[=6A 面2 : '\R/-. 面型:plane 1{?5/F \ + 材料:Air WoWmmZ 孔径:X=1.5, Y=6,Z=0.075,形状选择Box J'@`+veE Qn`Fq,uvL O_^;wey0}? 位置坐标:绕Z轴旋转90度, !T~C =,; oNp(GQ@0 Mcqym8,q|3 辅助数据: qx`)M3Mu|< LIfYpn6 首先在第一行输入temperature :300K,emissivity: 0.1; kGW4kuh)/q T*rx5*:o aS&,$sR Target 元件距离坐标原点-161mm; M6H#Y2!ZbC Bb*P);#.K 4(TR'_X( 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 8'o6: qORRpWyx& -HUlB|Q8r 探测器参数设定: iDV.C@ *#7]PA Qw 在菜单栏中选择Create/Element Primitive /plane tlcNGPa #L9F\ <K .{4U]a;[ .a7!*I#g l G $s( Hg2Rcl 元件半径为20mm*20,mm,距离坐标原点200mm。 h4tAaPcS+ ^e(*{K;8 光源创建: <L+y
6B Fm4)|5 光源类型选择为任意平面,光源半角设定为15度。 )GR4U8<>g rvp#[RAaS} 8 EUc
6 我们将光源设定在探测器位置上,具体的原理解释请见本章第二部分。 Ms14]M[\ %IK[d#HO 我们在位置选项又设定一行的目的是通过脚本自动控制光源在探测器平面不同划分区域内不同位置处追迹光线。 }$Z0v` Zx 5Ue#I !M;><b}=5 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。 r0,XR =p>IP"HJ 创建分析面: 1i/&t[ V~fPp"F 1s6L]&B 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。 ]h?p3T$h uc]`^,`2/ kn&>4/') 到此,所有的光学结构和属性设定完成,通过光线追迹我们可以查看光线是否可以穿过元件。 4}Dfi5:
.^V9XN{'a FRED在探测器上穿过多个像素点迭代来创建热图 oe,yCdPs +MyXIWmD FRED具有一个内置的可编译的Basic脚本语言。从Visual Basic脚本语言里,几乎所有用户图形界面(GUI)命令是可用这里的。FRED同样具有自动的客户端和服务器能力,它可以被调用和并调用其他可启动程序,如Excel。因此可以在探测器像素点上定义多个离轴光源,及在FRED Basic脚本语言里的For Next loops语句沿着探测器像素点向上和向下扫描来反向追迹光线,这样可以使用三维图表查看器(Tools/Open plot files in 3D chart)调用和查看数据。 6D/K=- 将如下的代码放置在树形文件夹 Embedded Scripts, ]4eIhj? c|<E~_.w@ v`Yj) 打开后清空里面的内容,此脚本为通用脚本适用于一切可热成像的应用。 % 9} ?*U _p;=]#+c& 绿色字体为说明文字, !z2 KQ
4C THY=8&x) '#Language "WWB-COM" tO+Lf2Ni+ 'script for calculating thermal image map 36UUt!}p 'edited rnp 4 november 2005 \^x`GsVy raJv$P 'declarations S(PU"}vZy Dim op As T_OPERATION wf2v9.;X:< Dim trm As T_TRIMVOLUME >,a$)z Dim irrad(32,32) As Double 'make consistent with sampling F}c}I8Ao Dim temp As Double X ;Cl8 Dim emiss As Double )Y:C'*.r Dim fname As String, fullfilepath As String \k.W
F|~ hj,y l& 'Option Explicit SGP)A(,k9 GUC.t7! Sub Main @G^m+- 'USER INPUTS U?=-V8#M| nx = 31 wyB ny = 31 vbEO pYCS numRays = 1000 k\Z7Dg$\D minWave = 7 'microns *;[g Ga~ maxWave = 11 'microns yR1v3D4E sigma = 5.67e-14 'watts/mm^2/deg k^4 #:s*Hy= fname = "teapotimage.dat" _B7+n"t\r 2:G/Oj h&] Print "" qaG8: Print "THERMAL IMAGE CALCULATION" p(.z#o# 97vQM detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 om2)Cd9~7 <+_WMSf;4 Print "found detector array at node " & detnode Yht |^ =a A,4Z{f83 srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 +g&M@8XO& Xxr"Gc[ Print "found differential detector area at node " & srcnode ou=33}uO O96%U$W GetTrimVolume detnode, trm #vzt6x@* detx = trm.xSemiApe yb) a dety = trm.ySemiApe w+gPU1|(r area = 4 * detx * dety GDYFhH7H Print "detector array semiaperture dimensions are " & detx & " by " & dety cC]lO Print "sampling is " & nx & " by " & ny b<j*;n. v(;n|=O 'reset differential detector area dimensions to be consistent with sampling `\yQn7 Oq pixelx = 2 * detx / nx <&l@ ):a pixely = 2 * dety / ny s[#_sR`y SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False X3m) Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 Y'yGhpT~ @T%8EiV 'reset the source power <Aqo['] SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) MH/bJtNq Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" ]h'*L` X*t2h3"} 'zero out irradiance array mD7kOOMY
For i = 0 To ny - 1 lBLL45%BIN For j = 0 To nx - 1 up2wkc8 irrad(i,j) = 0.0 !+(H(,gI Next j g\pLQH Next i gwDVWhq dg#w!etB 'main loop ]v#T9QQN EnableTextPrinting( False ) k,61Va 465?,EpS ypos = dety + pixely / 2 4e?MthJ> For i = 0 To ny - 1 .V@3zzv\ xpos = -detx - pixelx / 2 P52qt N< ypos = ypos - pixely _8e0vi!~2 A().1h1_k EnableTextPrinting( True ) V W( +sSQ Print i O+t'E9Fa EnableTextPrinting( False ) =g$%jM>35 ?@QcKQ@ |eqp3@Y1E For j = 0 To nx - 1 P98g2ak kV4,45r xpos = xpos + pixelx +iw4>0pi yC[Q-P *rG 'shift source NXOcsdcZu LockOperationUpdates srcnode, True T:g%b @ GetOperation srcnode, 1, op Y+Cv9U0 op.val1 = xpos M/kBAxNIC| op.val2 = ypos QObHW[:F SetOperation srcnode, 1, op M=4`^.Ocm LockOperationUpdates srcnode, False Esf\Bo" n&8SB'-r raytrace W8M(@*
T DeleteRays f=-R<l CreateSource srcnode AE=E"l1] TraceExisting 'draw ?@ 7Reh\ ohi0_mBz 'radiometry V0xO:7G^ For k = 0 To GetEntityCount()-1 .gY=<bG/fA If IsSurface( k ) Then *9(E0" temp = AuxDataGetData( k, "temperature" ) 8zQN[[#n emiss = AuxDataGetData( k, "emissivity" ) Li9>RY+3 If ( temp <> 0 And emiss <> 0 ) Then T}Wse{ ProjSolidAngleByPi = GetSurfIncidentPower( k ) Ehq
[4} frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) j+Q+.39s-~ irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi ,%U\@*6= End If cXK.^@du ]3uj~la End If g#o9[su .\8LL,zT Next k V5p->X2# 9>;CvR Next j
%$=2tfR ~'N+O K Next i 'ql<R0g EnableTextPrinting( True ) cyB2=, 1i;Cw/mr 'write out file }O2P>Z?V fullfilepath = CurDir() & "\" & fname pW_mS| Open fullfilepath For Output As #1 <t dsUh:?& Print #1, "GRID " & nx & " " & ny _po5j;"_O Print #1, "1e+308" -_bDbYL Print #1, pixelx & " " & pixely Fi#
9L Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 s` =&l N'Vj& DWC maxRow = nx - 1 PNH>LT^ maxCol = ny - 1 omI"xx For rowNum = 0 To maxRow ' begin loop over rows (constant X) h$p}/A row = "" AI-ZZ6lzR For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) L$^)QxH7 row = row & irrad(colNum,rowNum) & " " ' append column data to row string =.qPjp_Qd Next colNum ' end loop over columns O$X^Ea7~ *vT Abk$ Print #1, row Uurpho_~ ,r;E[k@ Next rowNum ' end loop over rows kb!W|l"PN Close #1 7Ac.^rv5 r|y\FL Print "File written: " & fullfilepath 8:K_S a% Print "All done!!" ;A0ZcgF End Sub -/_hO$|W B5[As8Sa 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: cbW=kQc_ 7A{Z1[7 _)6r@fZ.p 找到Tools工具,点击Open plot files in 3D chart并找到该文件 JY%l1:}G3 K6 ,d{n ;rl61d}NH# 打开后,选择二维平面图: .e\PCf9v 6t gq.XL^n
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