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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。 A8dI:E+$ _bI+QC# 成像示意图 vR]mSX3)? 首先我们建立十字元件命名为Target ac6*v49 Bxv8RB 创建方法: |U=(b, 6ojo##j 面1 : `-D$Fsl 面型:plane dt~iw 材料:Air F!~l
MpuE 孔径:X=1.5, Y=6,Z=0.075,形状选择Box "=A|K~b ?'2 v.5TQt ){tPP$-i= 辅助数据: KO-a; [/ 首先在第一行输入temperature :300K, UB&2f> emissivity:0.1; +k
rFB?>` _0]QS4a][c #Wx=v$" 面2 : BE%Z\E[[m 面型:plane 8vJdf9pB* 材料:Air WF)s*$'uz; 孔径:X=1.5, Y=6,Z=0.075,形状选择Box L<)Z> @fR }jcIDiSu 9cOx@c+/ 位置坐标:绕Z轴旋转90度, 5bBCpNa %O /d4 I Tn;m 辅助数据: r|bPR!0 ;z0"Ox=7 首先在第一行输入temperature :300K,emissivity: 0.1; F '#^`G9 (j=DD6fC .Qk{5=l6P Target 元件距离坐标原点-161mm; jZ/+~{< lEa W7j %1Jd^[W 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 k.{G&]r{ O*4gV }:G Yhk6Uog{4 探测器参数设定: tGqQJT#mr7 K#;txzi 在菜单栏中选择Create/Element Primitive /plane 6puVw-X &vkp?UH 9,KVBO *JS"(. '( r8+*|$K (n}%a6M 元件半径为20mm*20,mm,距离坐标原点200mm。 @e={Wy+Vm( LK
%K0o 光源创建: !?n50 I1~G$)w# 光源类型选择为任意平面,光源半角设定为15度。 EaCZx &*ZC0V3 &]*|6cR$E 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。 wmiafBA e x57'Cg \ 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。 sM0c#YK? QglYU tPzM7
n| 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。 T7ki/hjRb UCn.t 创建分析面: oX#9RW/ >I S8vx[ < SCI1bMf 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。 7Qt2gf 1=ip,D (Q\\Gw 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。 -t%L#1k tw]/,>\G FRED在探测器上穿过多个像素点迭代来创建热图 uH0#rgKt b%<16 4i 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。 g"w)@*?K 将如下的代码放置在树形文件夹 Embedded Scripts, o;*]1 OM1*Iy 5UPPk$8` 打开后清空里面的内容,此脚本为通用脚本适用于一切可热成像的应用。 h1E
PaL *WD;C0?z 绿色字体为说明文字, sb`&bA;i }]tFz}E\ '#Language "WWB-COM" N*HH,m& 'script for calculating thermal image map rXlx?GV 'edited rnp 4 november 2005 hzW{_Q.|? 9armirfV'P 'declarations #i@ACAgn;6 Dim op As T_OPERATION yW[L,N7d Dim trm As T_TRIMVOLUME KxGKA Dim irrad(32,32) As Double 'make consistent with sampling )K8P+zn~ Dim temp As Double P4i3y{$V Dim emiss As Double NYGmLbq Dim fname As String, fullfilepath As String C+T&O CG CQa0 'Option Explicit U2VV[e)Z! iJEB?y Sub Main q"P5,:W 'USER INPUTS IU7$%6<Y nx = 31 56"#Syj ny = 31 ,I/2.Q})[ numRays = 1000 !-F ^VGD(8 minWave = 7 'microns ?rky6 maxWave = 11 'microns Nvi Fq sigma = 5.67e-14 'watts/mm^2/deg k^4 0`V3s]%iu fname = "teapotimage.dat" @< wYT$ xq#U4E Print ""
{VS''Lv Print "THERMAL IMAGE CALCULATION" B:B8"ODV 8e]z6:}'E detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 Czq1
kz @X3 gBGY) Print "found detector array at node " & detnode bELIRM9 '.=Wk^,Ua srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 aytq4Ts UY1JB^J$ Print "found differential detector area at node " & srcnode sM#!Xl; w906aV*s GetTrimVolume detnode, trm Rrh<mo(yj# detx = trm.xSemiApe AD~~e%
s= dety = trm.ySemiApe 3Gc ,I:\ area = 4 * detx * dety ^fFtI?.6jI Print "detector array semiaperture dimensions are " & detx & " by " & dety mrK,Ql Print "sampling is " & nx & " by " & ny Oqd"0Qt-
pESB Il 'reset differential detector area dimensions to be consistent with sampling Uzan7A pixelx = 2 * detx / nx z0\;m{TH pixely = 2 * dety / ny e} sc]MTM SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False EC^Ev|PB\u Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 7( yXsVq
_8,vk-,' 'reset the source power fO[Rf_ SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) |h#DL$ Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" "Czz,;0 73&]En 'zero out irradiance array qf_hb For i = 0 To ny - 1 3*CzXK>`M& For j = 0 To nx - 1 6(ka"Vu~ irrad(i,j) = 0.0 E}xz7u Next j =-OCM*5~S Next i kHt!S9r f?/|;Zo4 'main loop u5u0*c EnableTextPrinting( False ) f o/
D3 @4G.(zW ypos = dety + pixely / 2 tqff84 For i = 0 To ny - 1 4]Un=?)I xpos = -detx - pixelx / 2
Hv[d<ylO ypos = ypos - pixely pb=jvK _7-"VoX EnableTextPrinting( True ) O\|C,Epm Print i N+Q(V*:3v EnableTextPrinting( False ) \SYPu,ZT Q\&AlV fK)ZJ_?w,@ For j = 0 To nx - 1 xTa4.ZXg NYSj^k;^(z xpos = xpos + pixelx +Z 93` 0C7thl{Dms 'shift source *b$z6. LockOperationUpdates srcnode, True O0K@M GetOperation srcnode, 1, op 7i-W*Mb: op.val1 = xpos sYAG,r>h op.val2 = ypos lU&`r:1>_ SetOperation srcnode, 1, op Ff)~clIK ' LockOperationUpdates srcnode, False b9W<1eqF afxj[;p! raytrace "<cB73tY DeleteRays DuTlYXM2^ CreateSource srcnode M^|"be~{' TraceExisting 'draw USnD7I/b 8>% jZ%`a 'radiometry J9b?}-O) For k = 0 To GetEntityCount()-1 *pcbwd!/ If IsSurface( k ) Then O4b-A3: temp = AuxDataGetData( k, "temperature" ) F8|5_214' emiss = AuxDataGetData( k, "emissivity" ) vOvxQS}dBp If ( temp <> 0 And emiss <> 0 ) Then D+*uKldS; ProjSolidAngleByPi = GetSurfIncidentPower( k ) *sc0,'0 frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) ="#:=i] irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi Lyf? V(S End If $>S}acuC V'HlAQr End If )$gsU@H - =0@d|LeZ Next k ;qT!fuN; jza}-=&+e Next j
rvwl 1OiZNuI:E Next i e-Ybac% EnableTextPrinting( True ) Qq;m"M / O5G<O(,\ 'write out file K-"HcHuF fullfilepath = CurDir() & "\" & fname ^ RcIE ( Open fullfilepath For Output As #1 ])$."g Print #1, "GRID " & nx & " " & ny `aO@N( Print #1, "1e+308" aowPji$H Print #1, pixelx & " " & pixely 9d,]_l.sB Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 YaY;o^11/ JEm?26n X maxRow = nx - 1 lH,]ZA./ maxCol = ny - 1 FkJ>]k For rowNum = 0 To maxRow ' begin loop over rows (constant X) e~>p.l row = "" V~]'+A
q> For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) ard3yNQt row = row & irrad(colNum,rowNum) & " " ' append column data to row string VtzyB Next colNum ' end loop over columns s5zGg]0 ,/w852|ub Print #1, row lE2wkY9^/ #v~S",*.f Next rowNum ' end loop over rows y3@x*_K8 Close #1 [o[v"e\w 7n\j"0z Print "File written: " & fullfilepath H(%] Os Print "All done!!" }VGI Y>v End Sub &,Zz 11@2 ;vw 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: +Qi52OG yqVaA 'w5 GmmT'3Q 找到Tools工具,点击Open plot files in 3D chart并找到该文件 P/gb+V=g! @]ptY* :)J~FVLy 打开后,选择二维平面图: }ygbgyLa zfr (dQ
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