| infotek |
2023-04-06 08:38 |
十字元件热成像分析
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。 cg.{oM wa h q)1YO
成像示意图 uMJ\ 首先我们建立十字元件命名为Target SVZocTt q.c)>=!. 创建方法: Snx!^4+MF dE7S[O 面1 : q`VL i 面型:plane c2y,zq|H 材料:Air ;f[lq^eV 孔径:X=1.5, Y=6,Z=0.075,形状选择Box Fl-\{vOn $KK~KEZ2
+!/ATR%Uci 辅助数据: uh)S;3| 首先在第一行输入temperature :300K, !y= R)k emissivity:0.1; iRzFA!wH |_V(^b} T3X'73M 面2 : X2z<cJG|d@ 面型:plane =l/6-j^ 材料:Air p;O%W@n" 孔径:X=1.5, Y=6,Z=0.075,形状选择Box |A%9c.DG. Y{p$% ffZ~r%25{ 位置坐标:绕Z轴旋转90度, o4);5~1l nlwqS Xw
n0xGIq 辅助数据: S6TNu+2w4 :?>7Z6 首先在第一行输入temperature :300K,emissivity: 0.1; [_,as [9 W@<p [3Pp
NCY Target 元件距离坐标原点-161mm; xN 1P# 7>FXsUt_
E/P~HE{ 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 Mo,&h?VOM? /wV|;D^ ) F (*B1J2_g 探测器参数设定: -(qRC0V @(3F4Z.i%. 在菜单栏中选择Create/Element Primitive /plane |$RNY``J M/zO|-j&
Zf'*pp T&q A,}M ^$@ 3JCo!n0 (l{vlFWd 元件半径为20mm*20,mm,距离坐标原点200mm。 i5 '&u: t" .Ytz> 光源创建: a`xq
h2P L, JQ\!c 光源类型选择为任意平面,光源半角设定为15度。 G]^[i6PQs qt/K$' Nwvlv{k' 我们将光源设定在探测器位置上,具体的原理解释请见本章第二部分。 @60D@Y 4,9$udiGY 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。 ^L[:DB{Z Nk|cU;?+ d2rs+- 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。 fz&B$1;8 }>A
q<1% 创建分析面:
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k0f9) 到这里元件参数设定完成,现在我们设定元件的光学属性,在前面我们分别对第一和第二面设定的温度和发射系数,散射属性我们设定为黑朗伯,4%的散射。并分别赋予到面一和面二。 g@.$P>Bh .E4*>@M5
hXW` n*Zw 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。 5xQ-f | f#wbw FRED在探测器上穿过多个像素点迭代来创建热图 xoaO=7\io ^Q6J$"Tj 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。 !"<[& 将如下的代码放置在树形文件夹 Embedded Scripts, T]#V }F`|_8L*v)
bO '\QtW9 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。 V Z(/g"9 aeqz~z2~8s 绿色字体为说明文字, m,l/=M d2k-MZuT6 '#Language "WWB-COM" NvR{S /Z 'script for calculating thermal image map .tBlGMcN 'edited rnp 4 november 2005 YeH!v, > ?jx]%n fV 'declarations 2*#|t: (c Dim op As T_OPERATION U1RU2M]v Dim trm As T_TRIMVOLUME k+<945kC Dim irrad(32,32) As Double 'make consistent with sampling ;b~ S/ Dim temp As Double g:
i5%1 Dim emiss As Double >lI7]hbIs Dim fname As String, fullfilepath As String U|^xr~q!f- OM*_%UF 'Option Explicit )uPJ?
2S9 tne_]+ Sub Main 0[;2dc 'USER INPUTS IqOg{#sm nx = 31 2
$>DX\h ny = 31 ys_2?uv numRays = 1000 j\>LJai" minWave = 7 'microns Xn7G2Yp maxWave = 11 'microns IwYeKN6s sigma = 5.67e-14 'watts/mm^2/deg k^4 ZsmOn#`=^} fname = "teapotimage.dat" -<iP$,bq72 &|v) Print "" ,75) Print "THERMAL IMAGE CALCULATION" hor7~u+ fFQ|dE;cF detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 pYr"3BwG rxY|&!f Print "found detector array at node " & detnode Rr) 5[ o)`PSw= srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 #Z&/w.D2 '&>"`q Print "found differential detector area at node " & srcnode 1.hWgW DP MP]<m7669* GetTrimVolume detnode, trm 'yo@5*x7 detx = trm.xSemiApe _e%D/} dety = trm.ySemiApe +UzQJt/>> area = 4 * detx * dety Q>niJ'7WF Print "detector array semiaperture dimensions are " & detx & " by " & dety i'~-\F! Print "sampling is " & nx & " by " & ny K)Y& I Qg> NJ\*Q 'reset differential detector area dimensions to be consistent with sampling Psb !Z( pixelx = 2 * detx / nx QcegT/vO pixely = 2 * dety / ny F(")ga$r SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False ycA<l" Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 0<M-asI? %nA})nA7= 'reset the source power r]B8\5|<d SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) D9rQ%|}S Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" h~dQ5% (d9~z 'zero out irradiance array _]:b@gXUw For i = 0 To ny - 1 =SDex.ZK] For j = 0 To nx - 1 o3WOp80hz irrad(i,j) = 0.0 `/|
*u Next j awLvLkQb{ Next i }\_.Mg^y O\}C`CiC 'main loop +Y;P*U}Qg[ EnableTextPrinting( False ) lg%fjBY @T1G#[C~t ypos = dety + pixely / 2 kG^76dAQL For i = 0 To ny - 1 I8#2+$Be+@ xpos = -detx - pixelx / 2 sz7*x{E ypos = ypos - pixely mh+T!v$[n) aq,1'~8XR EnableTextPrinting( True ) @N'n>8Wn Print i U~G7~L &m EnableTextPrinting( False ) nz 10/nw zLJ>)v$81 "1o{mvCkR For j = 0 To nx - 1 gC7!cn c[@_t.%) xpos = xpos + pixelx "M%R{pGA7 [@$ SLl^Y 'shift source uHbg&eW LockOperationUpdates srcnode, True 7H
H GetOperation srcnode, 1, op &61U1"&$ R op.val1 = xpos .ARYCTyG op.val2 = ypos dCx63rF`G SetOperation srcnode, 1, op d<c 29Y LockOperationUpdates srcnode, False 4:MvC^X~z _{|a<Keq| 'raytrace ~M~DH-aX DeleteRays `$a!CJu, CreateSource srcnode VoCg,gow TraceExisting 'draw ,%!m%+K9a w4
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2 'radiometry IIk_!VzT For k = 0 To GetEntityCount()-1 j26i+Z If IsSurface( k ) Then rrIyZ@_d9 temp = AuxDataGetData( k, "temperature" ) *qpFtBg emiss = AuxDataGetData( k, "emissivity" ) n"iS[uj, If ( temp <> 0 And emiss <> 0 ) Then #p+iwW- ProjSolidAngleByPi = GetSurfIncidentPower( k ) gUiO66#x frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) {7y;s irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi
9qX$ End If :.PA(97xb XtCIUC{r, End If MqJTRBs% k(H&Af+ Next k DG&'x;K"$ 7_~sa{1R. Next j AA\)BNM 3ynkf77cn Next i w_"d&eYdg0 EnableTextPrinting( True ) ?NBae\6r $f@YQN= 'write out file Ry95a%&/s fullfilepath = CurDir() & "\" & fname x'EEmjJ Open fullfilepath For Output As #1 Kp7DI0~ Print #1, "GRID " & nx & " " & ny ,ye}p1M Print #1, "1e+308" Q{~g<G Print #1, pixelx & " " & pixely 9]Jv
>_W* Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 eA N{BPN[ 2:
QT`e& maxRow = nx - 1 Y:CX RU6eD maxCol = ny - 1 ,nf}4 For rowNum = 0 To maxRow ' begin loop over rows (constant X) X~IilGL8: row = "" eEXNEgbn For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) 9!Av sC9 row = row & irrad(colNum,rowNum) & " " ' append column data to row string P!-RZEt$ Next colNum ' end loop over columns Y"
=8wNbr }NDl~5 Print #1, row yjT>bu]
aiPm.h> Next rowNum ' end loop over rows 5mamWPw Close #1 Cab-:2L] s AFn.W Print "File written: " & fullfilepath a&{Y~Og?% Print "All done!!" 1;[KBYUH End Sub J4+WF#xI2 yeyDB>#Va. 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: ;PaU"z+Je~ [~Ky{:@)[ \MEBQ 找到Tools工具,点击Open plot files in 3D chart并找到该文件 9(t(sP_ OUWK t]I9[5Pq\ 打开后,选择二维平面图: gaN/
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