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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。 x'{L %c>L \]e"#"v}}_ 成像示意图 ZMy0iQ@ 首先我们建立十字元件命名为Target mVg-z~44T f ."bq43( 创建方法: sWP5=t(i+9 n$g g$< 面1 : !5wm9I!5^ 面型:plane K4YpE}]u 材料:Air ^&MMtWR 孔径:X=1.5, Y=6,Z=0.075,形状选择Box ya0L8`q %| }obiV) ;t{Ew+s 辅助数据: ^6bU4bA 首先在第一行输入temperature :300K, Q"n*`#Yt' emissivity:0.1; Jp=eh OW-[#r
Q0i.gEwe 面2 : `9n%Dy< 面型:plane uIvy1h9m 材料:Air l&S2.sC 孔径:X=1.5, Y=6,Z=0.075,形状选择Box "rOe J~4 X >KmOTM<{ S#Tc{@e 位置坐标:绕Z轴旋转90度, ^E*W
B~ yQ-&+16^ Mo\LFxx>4{ 辅助数据: wWv")dk3i R5c
Ya 首先在第一行输入temperature :300K,emissivity: 0.1; o?$kcI4 jFY6}WY)}7 &Ed7|k]H Target 元件距离坐标原点-161mm; kRo
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@ '^)Ve:K-. HgPRz C 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 ~s{yh-B sgp5b$2T. {"$
Q'T 探测器参数设定: :Fz;nG-G aT1T.3 a 在菜单栏中选择Create/Element Primitive /plane =QFnab?N ,_@C(O *{8<4CVv QlmZBqK}& GO{o #} k~Qb"6n2 元件半径为20mm*20,mm,距离坐标原点200mm。 ?K%&N99c! L1A0->t 光源创建: \]ouQR.t@\ Y?W"@awE"\ 光源类型选择为任意平面,光源半角设定为15度。 9v>BP`Mg fmyyQ|]O" px;5X4U 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。 hfT HP 35I y\ 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。 2c`m8EaJ m99j]wr~c 7hwl[knyB 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。 7OY<*ny >Pne@w!* 创建分析面: q$FwO"dC SFCKD/8 XDs ) 到这里元件参数设定完成,现在我们设定元件的光学属性,在前面我们分别对第一和第二面设定的温度和发射系数,散射属性我们设定为黑朗伯,4%的散射。并分别赋予到面一和面二。 l^aG"")TH. r2A%.bL# dzJ\+
@4 到此,所有的光学结构和属性设定完成,通过光线追迹我们可以查看光线是否可以穿过元件。 y3l3XLI*b np3$bqm FRED在探测器上穿过多个像素点迭代来创建热图 1-[~} t
I}@1 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。 Y2709LWmP 将如下的代码放置在树形文件夹 Embedded Scripts, F F<xsoZJ YoiM\gw *fyC@fI> 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。 EOJ k7 B;xw @:H 绿色字体为说明文字, [=M0%" Lt ;!q b. '#Language "WWB-COM" / *3[9, 'script for calculating thermal image map .3WDtVE 'edited rnp 4 november 2005 %zj;~W;qPH i(DoAfYf/q 'declarations &'`q&U1x Dim op As T_OPERATION VK\ Bjru9 Dim trm As T_TRIMVOLUME 5sJi- ^ Dim irrad(32,32) As Double 'make consistent with sampling ngF5ywIG Dim temp As Double z
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9Gi5& Dim emiss As Double *>Sb4: Dim fname As String, fullfilepath As String p;Ezmz -L e:%q2 'Option Explicit *:t]|$;E\ PZ5BtDm Sub Main XVwaX2=L 'USER INPUTS wn*<.s nx = 31 B.w ihJVDg ny = 31 ;#c|ZnX numRays = 1000 L B`=+FD minWave = 7 'microns @Dc?fyY*o< maxWave = 11 'microns 0v6(A4Y sigma = 5.67e-14 'watts/mm^2/deg k^4 ?DPNa fname = "teapotimage.dat" xK4b(KJj P(?i>F7s Print "" 9^l[d< Print "THERMAL IMAGE CALCULATION" j" wX7 e ='bc7$ detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 VYw
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}izTI Print "found detector array at node " & detnode x`N_tWZ 6GVj13Nr srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 |k5uVhN 'G1~\CT Print "found differential detector area at node " & srcnode .#n1p:}[ U9:?d>7 GetTrimVolume detnode, trm s8w7/*<d detx = trm.xSemiApe 5`m RrEA dety = trm.ySemiApe c +Pg[1- area = 4 * detx * dety # Sfz^
Print "detector array semiaperture dimensions are " & detx & " by " & dety i<<NKv8; Print "sampling is " & nx & " by " & ny cJ9:XWW HfN-WYiR 'reset differential detector area dimensions to be consistent with sampling kIS&! V pixelx = 2 * detx / nx bni :B?# pixely = 2 * dety / ny Id8^6FLw SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False S-^y;#= Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 g Z3VT{ vn;_|NeSf 'reset the source power mo%9UL,#W SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) .<JD'%?" Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" "B`yk/GM] y7M" Dr%t^ 'zero out irradiance array w
<zO For i = 0 To ny - 1 NJ8QI(^" For j = 0 To nx - 1 v8!
1"FYL irrad(i,j) = 0.0 w-Zb($_ Next j 4xLU15C Next i 9k.LV/Y ?8wFT!J 'main loop e*gCc7zz EnableTextPrinting( False ) e9r#r~Qq| K~$o2a
e ypos = dety + pixely / 2 rtcY(5Q For i = 0 To ny - 1 .v[8ie xpos = -detx - pixelx / 2 [sG=(~BU ypos = ypos - pixely 8.D$J @
?y(\> EnableTextPrinting( True ) 31mY]Jve" Print i e"en
ma\_ EnableTextPrinting( False ) {UT>>
*C W2h^ShG s]Z/0:` For j = 0 To nx - 1 ,ZjbbBZ !?B9 0( xpos = xpos + pixelx SPA_a\6_ GIQ/gM?Pv 'shift source M@@"-dy LockOperationUpdates srcnode, True kK!An!9C GetOperation srcnode, 1, op V/i&8UMw op.val1 = xpos jTk !wm= op.val2 = ypos *=}$@OS SetOperation srcnode, 1, op N,|:=gD_ LockOperationUpdates srcnode, False Y}(#kqh> '/
3..3k raytrace eG26m_S= DeleteRays Ty\&ARjb 8 CreateSource srcnode 'LIJpk3J TraceExisting 'draw j<!rc>)2+L s9)
@$3\ 'radiometry [>#?C*s For k = 0 To GetEntityCount()-1 Mvoi
If IsSurface( k ) Then M=n!tVlCV temp = AuxDataGetData( k, "temperature" ) $A6'YgK emiss = AuxDataGetData( k, "emissivity" ) g<oSTAw If ( temp <> 0 And emiss <> 0 ) Then `/ix[:}m^ ProjSolidAngleByPi = GetSurfIncidentPower( k ) sJtz{' frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) msg&~"Z irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi q.i@Lvu# End If [La=z7* /HH5Mn* End If s&Y~48{ +#O?a`f Next k %YefTk8cr, -fVeE<[ Next j ?,NZ/n C/%umazP9 Next i 8m1@l$ EnableTextPrinting( True ) %b'ic )K>XLaG) 'write out file h";G vjy fullfilepath = CurDir() & "\" & fname a?E]-Zf Open fullfilepath For Output As #1 Lhu2;F\/ Print #1, "GRID " & nx & " " & ny ZN5\lon|Y Print #1, "1e+308" *\m
53mb Print #1, pixelx & " " & pixely vjaIFyj Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 i%>]$* orf21N+ [ maxRow = nx - 1 & PrV+Lv maxCol = ny - 1
f]q3E[?/ For rowNum = 0 To maxRow ' begin loop over rows (constant X) Q?n} ~(%& row = "" 1t=Y+|vA9 For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) !TP8LQ row = row & irrad(colNum,rowNum) & " " ' append column data to row string 5 +:b#B Next colNum ' end loop over columns hFuS>Hx ~}w(YQy=y Print #1, row uF9p:FvN8 qrO]t\ Next rowNum ' end loop over rows c3&F\3 Close #1 ja70w:ja d|]F^DDuI Print "File written: " & fullfilepath r Y|'<$wvg Print "All done!!" ?mS798=f End Sub A{\7HV 5 cEi{+rfZd| 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: `R0>;TdT u-Ct-0 =1)yI>2e%} 找到Tools工具,点击Open plot files in 3D chart并找到该文件 @no]*?Gpa P1=bbMk oP5G*AFUq 打开后,选择二维平面图: Df02#493 $&nF1HBI4 |