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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。 7Mb#O_eh s7Ub@ 成像示意图 Lzu.)C@Amx 首先我们建立十字元件命名为Target h3LE>}6D $,+O9Et 创建方法: &e6CJ 'Vyt4^$% 面1 : h$4Hw+Yxs] 面型:plane Zjbc3M5 材料:Air wiz$fj 孔径:X=1.5, Y=6,Z=0.075,形状选择Box R"
;xvo* P"B0_EuR<T Tb3J9q+ya 辅助数据: S S2FTb-m 首先在第一行输入temperature :300K, &?mD$Eo emissivity:0.1; Zt.'K(]2h DxUKUE _%5Ro6 面2 : sZx/Ee 面型:plane B!vmQR*1 材料:Air $5Xh,DOg 孔径:X=1.5, Y=6,Z=0.075,形状选择Box D6>HN[D" $STaQ28C U2bjFLd" 位置坐标:绕Z轴旋转90度, (p2K36,9m `s\?w5[ 0NS<?p~_S 辅助数据: bbrXgQ`s+w l
c+g&f 首先在第一行输入temperature :300K,emissivity: 0.1; b )B?
F o4|M0 G1 vNt7 Target 元件距离坐标原点-161mm; {phNds% Ney/[3 A :A/d to 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 mV3cp rRqv S:h{2{ ILGMMA_2 探测器参数设定: ogyTO|V= ;M)QwF1 在菜单栏中选择Create/Element Primitive /plane ;7}VBkH ,6-:VIHQ Tj:B!>> D)L+7N0D~ x[a<mk Qk:Y2mL 元件半径为20mm*20,mm,距离坐标原点200mm。 o,_?^'@ e
9;~P} 光源创建: gt@m?w( uG,5BV .M 光源类型选择为任意平面,光源半角设定为15度。 f|\onHI)> f&Gt| be.*#[ 我们将光源设定在探测器位置上,具体的原理解释请见本章第二部分。 A~)D[CV bbE!qk;hEP 我们在位置选项又设定一行的目的是通过脚本自动控制光源在探测器平面不同划分区域内不同位置处追迹光线。 U|jSa,} {\81i8b] U/!TKic+ 功率数值设定为:P=sin2(theta) theta为光源半角15度。我们为什么要这么设定,在第二部分会给出详细的公式推导。 k$blEa4 F(>Np2oi6 创建分析面: ,U2*FZ[" 9Z4nAc ]s<[D$ <, 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。 AE[b},-[ e"|efE JMC. w! 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。 4h|c<-`>t ;r<^a6B FRED在探测器上穿过多个像素点迭代来创建热图 Ayxkv)%:@) nT7%j{e=L 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。 y
[}.yyye 将如下的代码放置在树形文件夹 Embedded Scripts, 0XE4<U |-:()yxs k\5c|Wq|g 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。 rC5
p-B% !>FYK}c7 绿色字体为说明文字, >*35C`^ l+KY)6o '#Language "WWB-COM" M:Pc, 'script for calculating thermal image map ~vm%6CABM 'edited rnp 4 november 2005 ]cHgleHQ t}r' k/[ 'declarations f6hnTbJ Dim op As T_OPERATION |d{PA.@33 Dim trm As T_TRIMVOLUME (ZUHvvL Dim irrad(32,32) As Double 'make consistent with sampling lXW%FH6c+ Dim temp As Double gb[5&>(# Dim emiss As Double 6m}Ev95 Dim fname As String, fullfilepath As String y%"{I7!A 11Q1AN 'Option Explicit SW@$ci (KjoSN(
K Sub Main n<LEler#M 'USER INPUTS ~!B\(@GU nx = 31 rBQ _iB_ ny = 31 ,LHn90S numRays = 1000 ?gA 8x minWave = 7 'microns &*M!lxDN maxWave = 11 'microns T<n sigma = 5.67e-14 'watts/mm^2/deg k^4 X_q\S g fname = "teapotimage.dat" ,0M_Bk" 6AAz Print "" |3('
N#| Print "THERMAL IMAGE CALCULATION" Ua:}V n&! t%d Z-Ym detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 cuax;0{% g];!&R- Print "found detector array at node " & detnode p$S*dr ER%^!xA srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 ~[t[y~Hup G30-^Tr Print "found differential detector area at node " & srcnode wON!MhA; `'DmDg GetTrimVolume detnode, trm KjD/o?JUr detx = trm.xSemiApe T$8)u'-pa dety = trm.ySemiApe 4>wP7`/+y area = 4 * detx * dety {:/#Nc$5 Print "detector array semiaperture dimensions are " & detx & " by " & dety Xr,1&"B&t Print "sampling is " & nx & " by " & ny 8SMxw~9$ T^zXt? 'reset differential detector area dimensions to be consistent with sampling X]ipI$'+C pixelx = 2 * detx / nx /:cd\A} pixely = 2 * dety / ny A#e%^{q$ SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False wW Lj?;bx Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 #|uCgdi LP.]9ut 'reset the source power 5?f ^Rz SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) ^
gdaa>L Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" jk;j2YNPw =>m<GvQz 'zero out irradiance array ]vAz For i = 0 To ny - 1 3/P1!:g9 For j = 0 To nx - 1 /4y o` irrad(i,j) = 0.0 (Lbbc+1m Next j ]_)yIi" Next i ]=\].% > GV1pn) 4 'main loop lt/1f{v[: EnableTextPrinting( False ) vx{}}/B]J CT&|QH{ ypos = dety + pixely / 2 V.U|
#n5 For i = 0 To ny - 1 %aP!hy xpos = -detx - pixelx / 2 l5~os> ypos = ypos - pixely y5vvu>nd &5>Kl}7 EnableTextPrinting( True ) EfqX
y>W Print i Q-(zwAaE EnableTextPrinting( False ) ,<.V7(|t) &j;wCvE4+ Q3 ea{!r For j = 0 To nx - 1 |NlO7aQ>2H <;lkUU(WT2 xpos = xpos + pixelx ${DUCud,kY (|2t#'m 'shift source kj Jn2c:y LockOperationUpdates srcnode, True QL(n} {.% GetOperation srcnode, 1, op pd?Mf=># op.val1 = xpos gM&{=WDG6 op.val2 = ypos 8C40%q.. SetOperation srcnode, 1, op :'Vf
g[Uq LockOperationUpdates srcnode, False td$E/h=3 <NMEGit 'raytrace 7P} W
* DeleteRays 5%"V[lDx@ CreateSource srcnode ?d* z8w TraceExisting 'draw IW5,7. ibcRU y0% 'radiometry Y/F6\oh For k = 0 To GetEntityCount()-1 t5Sy V:fP If IsSurface( k ) Then I{|O "8 temp = AuxDataGetData( k, "temperature" ) Cp\6W[2+B emiss = AuxDataGetData( k, "emissivity" ) w?L6!) oiz If ( temp <> 0 And emiss <> 0 ) Then 7g^]:3f! ProjSolidAngleByPi = GetSurfIncidentPower( k ) !aUs>1i frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) (g]!J_Z" irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi .xCZ1|+gG End If -OV&Md:~ Ov@gh
kr End If KYm0@O>; 2DA]i5
Next k }dX*[I X0HZH?V+ Next j b!t0w{^w h4gXvPS&r Next i :
$1?i) EnableTextPrinting( True ) b`Zx!^ #\{l"- 'write out file E: 68?IJ fullfilepath = CurDir() & "\" & fname { l/U6]( Open fullfilepath For Output As #1 b=C*W,Q_# Print #1, "GRID " & nx & " " & ny aqZi:icFa Print #1, "1e+308" %@b0[ZC Print #1, pixelx & " " & pixely qz_7%c]K[ Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 )rU >58YjLXb maxRow = nx - 1 K-)]
1BG maxCol = ny - 1 xK[ou' For rowNum = 0 To maxRow ' begin loop over rows (constant X) K8|r&`X0 row = "" /xBb[44z8 For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) Wu/]MBM row = row & irrad(colNum,rowNum) & " " ' append column data to row string 5Pc;5
o0C Next colNum ' end loop over columns v4TQX<0s CZwXTHe Print #1, row B3`5O[6 P= BZ+6DS Next rowNum ' end loop over rows 4i;{!sT Close #1 Y1\ }5k{> &J]K3w1p Print "File written: " & fullfilepath {
'eC`04E Print "All done!!" /{J4:N'B> End Sub u/0h$l H7Rx>h_ 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: C3f' {} .NC!7+1m 9<?M8_ 找到Tools工具,点击Open plot files in 3D chart并找到该文件 M]
%?>G [85spub&} 8NJqV+jn)t 打开后,选择二维平面图: }"H,h)T .hb:s,0mP
QQ:2987619807 iq8<ov
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