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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。 bMu+TgAT, fLD,5SN 成像示意图 #ut 首先我们建立十字元件命名为Target v2\FA(BPn m%?pf2%I# 创建方法: 0c]/bs{} l
-m fFN 面1 : (k)v!O- 面型:plane Z'W=\rl 材料:Air :T$|bc 孔径:X=1.5, Y=6,Z=0.075,形状选择Box S-b/S5 zOIDU ]t,BMu=% 辅助数据: -%CP@dAk 首先在第一行输入temperature :300K, EhvX)s emissivity:0.1; KYhw OGN {.|CdqwY OU.6bmWy| 面2 : aEWWP] 面型:plane
@4#c&h3 材料:Air RFc v^Xf 孔径:X=1.5, Y=6,Z=0.075,形状选择Box V>LwqS~` W:nef<WH +oML&g-g_ 位置坐标:绕Z轴旋转90度, ~?Pw& K2 RVmh6m 9};8?mucr 辅助数据: qkY:3Ozw LEf^cM=> 首先在第一行输入temperature :300K,emissivity: 0.1; u@M,qo` 0<@KG8@hI; ~<5!?6Yt Target 元件距离坐标原点-161mm; yYYSeH &64h ;P< U&OJXJdj 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 Bahm]2 %E>Aw>]v hH3RP{'= 探测器参数设定: ]7BvvQ
`25yE/ 在菜单栏中选择Create/Element Primitive /plane zxl@(hd Y=I'czg 2\{M:\2o uyWunpT Pn1^NUMZJ _8J.fT$${ 元件半径为20mm*20,mm,距离坐标原点200mm。 ((;!<5-`s -f^tE,- 光源创建: q~o<*W $( kF# 光源类型选择为任意平面,光源半角设定为15度。 /Iokf@5 &h)yro 4.aZ#c91_ 我们将光源设定在探测器位置上,具体的原理解释请见本章第二部分。 v{N`.~,^ *OsQ}onv 我们在位置选项又设定一行的目的是通过脚本自动控制光源在探测器平面不同划分区域内不同位置处追迹光线。 Y\P8v M
FMs[+2_o 7S:\"A7 功率数值设定为:P=sin2(theta) theta为光源半角15度。我们为什么要这么设定,在第二部分会给出详细的公式推导。 P3=G1=47U t%)7t9j 创建分析面: |SSSH
Hzz %3}E lfgq=8d 到这里元件参数设定完成,现在我们设定元件的光学属性,在前面我们分别对第一和第二面设定的温度和发射系数,散射属性我们设定为黑朗伯,4%的散射。并分别赋予到面一和面二。 rXP,\ ]r+ L`TLgH&?R 8/#A!Ww] 到此,所有的光学结构和属性设定完成,通过光线追迹我们可以查看光线是否可以穿过元件。 *:7rdzn ~,Ix0h+H+M FRED在探测器上穿过多个像素点迭代来创建热图 JPHL#sKyz G e@{_ FRED具有一个内置的可编译的Basic脚本语言。从Visual Basic脚本语言里,几乎所有用户图形界面(GUI)命令是可用这里的。FRED同样具有自动的客户端和服务器能力,它可以被调用和并调用其他可启动程序,如Excel。因此可以在探测器像素点上定义多个离轴光源,及在FRED Basic脚本语言里的For Next loops语句沿着探测器像素点向上和向下扫描来反向追迹光线,这样可以使用三维图表查看器(Tools/Open plot files in 3D chart)调用和查看数据。 'JE`(xD 将如下的代码放置在树形文件夹 Embedded Scripts, /36:ms A {}przrU^c Q3~H{)[Kq 打开后清空里面的内容,此脚本为通用脚本适用于一切可热成像的应用。 >Cp0.A:UC# +Kc 绿色字体为说明文字, ;H*T^0 g:@#@1rB6 '#Language "WWB-COM" (5YM?QAd 'script for calculating thermal image map s ll\g 'edited rnp 4 november 2005 .~;\eW [ 9.-S(ZO 'declarations 0[(8 Dim op As T_OPERATION !;A\.~-!G Dim trm As T_TRIMVOLUME M7~2iU<# Dim irrad(32,32) As Double 'make consistent with sampling 6d}lw6L Dim temp As Double @Nx9) Dim emiss As Double tDcT%D {: Dim fname As String, fullfilepath As String K69'6?# .`eN8Dl1 'Option Explicit \}b%E'+_T dZ@63a>>@ Sub Main .L~AL|2_ 'USER INPUTS 7JH6A'& nx = 31 _V6ukd"B~ ny = 31 C,r;VyW6BI numRays = 1000 k4;7<j$ir minWave = 7 'microns $6 f3F?y7 maxWave = 11 'microns [z{1*Xc sigma = 5.67e-14 'watts/mm^2/deg k^4 tyFzSrfc fname = "teapotimage.dat" XpHrt XD #;yZ Print "" n_A3#d<9 Print "THERMAL IMAGE CALCULATION" oG\Vxg* r,p%U!S<hV detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 S,UDezxg "!^"[mX4 Print "found detector array at node " & detnode I\ob7X'Xu! kDxFloK srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 g) jYFfGfH Xx:"4l.w. Print "found differential detector area at node " & srcnode #X1ND #\OA )`U GetTrimVolume detnode, trm PJH& detx = trm.xSemiApe g2_"zDiw2 dety = trm.ySemiApe #*Ctwl,T area = 4 * detx * dety VTE .^EK! Print "detector array semiaperture dimensions are " & detx & " by " & dety Fx.=#bVX7 Print "sampling is " & nx & " by " & ny "
H\k`.j 4tBYR9| 'reset differential detector area dimensions to be consistent with sampling B]tQ(s~ pixelx = 2 * detx / nx ~]2K^bh8& pixely = 2 * dety / ny iYy1!\ SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False 26h21Z16q Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 7kEn \ 4kx
N<] 'reset the source power I!K6o.|1 SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) ?=Kduef Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" Km$\:Xo @j/a=4o[ 'zero out irradiance array ?Ir:g=RP* For i = 0 To ny - 1 InI$:kJ For j = 0 To nx - 1 \9T7A& irrad(i,j) = 0.0 7%M_'P4 V Next j 8":Q)9;% Next i D0f] $ ;2QP7PrSY 'main loop w}L[u
r;I_ EnableTextPrinting( False ) es7=%!0 V'gh6`v ypos = dety + pixely / 2 ?:0Jav For i = 0 To ny - 1 ZN0P:== xpos = -detx - pixelx / 2 w7L)'9 ypos = ypos - pixely $XH^~i; y6BAH EnableTextPrinting( True ) ~k5W@`"W Print i *vMn$,^0h9 EnableTextPrinting( False ) iy.\=Cs$N (TM,V!G+U~ A04U /; For j = 0 To nx - 1 v3>UV8c' GM<9p_
B xpos = xpos + pixelx jPkn[W#
6 *oix 6 'shift source E]r?{t`] LockOperationUpdates srcnode, True 0"z9Q\{} GetOperation srcnode, 1, op F!K>K z op.val1 = xpos |_U= z;Y op.val2 = ypos u*9V&>o SetOperation srcnode, 1, op (QB2T2x LockOperationUpdates srcnode, False f|(M.U- !;'=iNOYR 'raytrace N'=gep0V@ DeleteRays d0>
zS CreateSource srcnode A3*!"3nU TraceExisting 'draw j'K/22 _)-o1`*- 'radiometry V=3b&TkE For k = 0 To GetEntityCount()-1 _SkLYL!=9 If IsSurface( k ) Then +"VP-s0 temp = AuxDataGetData( k, "temperature" ) hpk7 Anp emiss = AuxDataGetData( k, "emissivity" ) 8dhUBJ0_ If ( temp <> 0 And emiss <> 0 ) Then xkAK!uVy ProjSolidAngleByPi = GetSurfIncidentPower( k ) $ME)#( frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) a'IdYW0 irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi U/BR*Zn]* End If syK^<xa 4KrL{Z+} End If yV(\R ehY5!D1Q Next k Wm5dk9&x ?z
u8)U Next j Z%\,w(o[h A5w6]: f2 Next i a.6(K EnableTextPrinting( True ) BsJC0I( 1-QS~)+ 'write out file igAtRX%Qx fullfilepath = CurDir() & "\" & fname g=o4Q<
#^y Open fullfilepath For Output As #1 pD+k* Print #1, "GRID " & nx & " " & ny Q NVa?'0"Y Print #1, "1e+308" cCc(fF*^ Print #1, pixelx & " " & pixely "
2Dngw Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 ^Zp>G{QL{ 5/z/>D; maxRow = nx - 1 )sp+8 maxCol = ny - 1 G*v,GR For rowNum = 0 To maxRow ' begin loop over rows (constant X) Wo,?+I row = "" 8HdAFRw For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) E1 f\%!2l row = row & irrad(colNum,rowNum) & " " ' append column data to row string y* h<MQ Next colNum ' end loop over columns WMP,\=6k0 <rS F* Print #1, row RCLeA=/N@0 'A[dCc8O Next rowNum ' end loop over rows N)>ID(}F1 Close #1 t&Og $@ A.w:h;7 Print "File written: " & fullfilepath L4?IHNB Print "All done!!" H 7
^/q7 End Sub =E{`^IT'R YT8F#t8 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: aFIw=c(nP P
L+sR3bR *4_Bd=5(U 找到Tools工具,点击Open plot files in 3D chart并找到该文件 /|#fejPh f:P}*^
Gw 8e"gW >f 打开后,选择二维平面图: 0Fr?^3h r/*D:x|yN
QQ:2987619807 pFz`}?c0
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