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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。 NJb5HoYZ ZFy>Z:&S, 成像示意图 UOrfwK 首先我们建立十字元件命名为Target S8+Xk= x %=J<WA6\ 创建方法: W! FmC$Kc 9k_3=KS3N 面1 : /IM5#M5~ 面型:plane 1!. CfQi 材料:Air w$*t.Q* 孔径:X=1.5, Y=6,Z=0.075,形状选择Box v~:$]a8 kW&{0xkGR gP*:>[lR 辅助数据: 5-|fp(Ww_W 首先在第一行输入temperature :300K, n$ye:p>`- emissivity:0.1; NfcQB;0 {#CyO
b4 K,YKU?z6 面2 : .}.5|z} A 面型:plane {\G4YQ 材料:Air 5gWn{[[e)y 孔径:X=1.5, Y=6,Z=0.075,形状选择Box u]P0:)tS. Zg%SE'kK fSdv%$;Hc 位置坐标:绕Z轴旋转90度, ?6@Y"5
z3g =)C}u6 (6p5Fo 辅助数据:
>lqWni -\@&^e 首先在第一行输入temperature :300K,emissivity: 0.1; GYot5iLg _Tyj4t0ElV WF<0QH Target 元件距离坐标原点-161mm; : g/H N9 }2M2R}D $~4ZuV% 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 {{M?+]p,^ =
wNul" Y'kD_T`f, 探测器参数设定: aX6.XHWbDf +ib72j%A 在菜单栏中选择Create/Element Primitive /plane }9e4?7 o
Wg5-pMWZ bU1UNm`{C 67 >*AL )RlaVAtM s]0x^"#B 元件半径为20mm*20,mm,距离坐标原点200mm。 BuI&kU,WY tsq]QTA* 光源创建: Gs2.}lz "2(4?P 光源类型选择为任意平面,光源半角设定为15度。 68R[Lc9q5 ]c8lZO> AEm?g$a 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。 $Y][-8{t vBQ|h
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。 D
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X~mT 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。 LOi5 ^Um| 5SFeJBS 创建分析面: [-_u{j yWu80C8q EP7L5GZ-a 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。 ZVE q{x1Zc E
N%cjvE T<~NB5&f 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。 I(ds]E
;_E XX~~SvSM FRED在探测器上穿过多个像素点迭代来创建热图 [2.uwn]i ~:Dr]kt 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。 U$6N-q 将如下的代码放置在树形文件夹 Embedded Scripts, k61Ot3 Ix !O&_6s s$J0^8Q~i 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。 PMjqcdBzm 8 vK
Z; 绿色字体为说明文字, 95>(NwST4 )#Ea~>v '#Language "WWB-COM" pUZe.S>G 'script for calculating thermal image map rC}r99Pe:x 'edited rnp 4 november 2005 Xm*gH, ' uG&xtN8 'declarations h djv/ Dim op As T_OPERATION Hb=4k)-/] Dim trm As T_TRIMVOLUME *^ncb,1+i Dim irrad(32,32) As Double 'make consistent with sampling 5E?{>1 Dim temp As Double X*1vIs;[@ Dim emiss As Double )U e9:e Dim fname As String, fullfilepath As String |2AK~t|t 2#ND( 'Option Explicit g5lf-}? I/rq@27o Sub Main 3D[IZ^%VtM 'USER INPUTS "zJ1vIZY nx = 31 1XUsr;Wz ny = 31 4]u53` numRays = 1000 !]7Z),s minWave = 7 'microns o X )r4H? maxWave = 11 'microns DzYi>
E:* sigma = 5.67e-14 'watts/mm^2/deg k^4 }Zc.rk fname = "teapotimage.dat" ]6Kx0mW p]:5S_$ Print "" 5;oWFl Print "THERMAL IMAGE CALCULATION"
TB\#frG ;'NB6[x detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 :o?On/ v4=9T<[ Print "found detector array at node " & detnode 3qE2mYK 7'z{FSS srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 CEq0ZL-W <Qu]m.z[ Print "found differential detector area at node " & srcnode vdAaqM6D DX l3 GetTrimVolume detnode, trm C:xgM'~+ detx = trm.xSemiApe xDG8C39qrs dety = trm.ySemiApe (4o_\& area = 4 * detx * dety XT>
u/Z ) Print "detector array semiaperture dimensions are " & detx & " by " & dety |jH-
bm Print "sampling is " & nx & " by " & ny B ZP}0 x>d,\{U 'reset differential detector area dimensions to be consistent with sampling x;dyF_*; pixelx = 2 * detx / nx *cz nokq6 pixely = 2 * dety / ny -61{ MMiA SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False RTHD2 Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 0eUK' "bZ%1)+ 'reset the source power l8 k@.<nCO SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) _>+!&_h Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" fT.18{'> q">lP(t 'zero out irradiance array xCGa3 X For i = 0 To ny - 1 d,AEV_ For j = 0 To nx - 1 _[u&}i irrad(i,j) = 0.0 u:JD Next j I },.U&r Next i 2kb<;Eh`G `ECT8 'main loop Fv$5Zcf EnableTextPrinting( False ) #{KYsDtvx q{~59{Fha ypos = dety + pixely / 2 Cl#PYB{1Y For i = 0 To ny - 1 X)^eaw]Q0 xpos = -detx - pixelx / 2 S^(OjS ypos = ypos - pixely CC&o pC 15dhr]8E EnableTextPrinting( True ) Ro3C(aRx Print i sh;DCd EnableTextPrinting( False ) 2*;qr|h, ~SUrbRaY> nX%b@cOXj For j = 0 To nx - 1 "g27|e?y 36"-cGNr{ xpos = xpos + pixelx 4'u +%6+__ IlN: NS 'shift source 0%J0.USkM7 LockOperationUpdates srcnode, True d1CQ;,Df< GetOperation srcnode, 1, op !Q[j;f
op.val1 = xpos -#@l`kt op.val2 = ypos c"D%c(:4| SetOperation srcnode, 1, op :Ywb LockOperationUpdates srcnode, False h|~I'M]* fk%W07x! raytrace r{\c.\ DeleteRays r+v?~m! CreateSource srcnode D2}N6i TraceExisting 'draw wr);+.T9R }@6Tcn1 'radiometry iWu For k = 0 To GetEntityCount()-1 k Il!n
If IsSurface( k ) Then ((0nJJjz temp = AuxDataGetData( k, "temperature" ) PY81MTv0; emiss = AuxDataGetData( k, "emissivity" ) EPeKg{w If ( temp <> 0 And emiss <> 0 ) Then ;::]R'F[ ProjSolidAngleByPi = GetSurfIncidentPower( k ) RW"QUT frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) {:=sCY! irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi g{ () End If )+GwYt Y#e,NN End If |k.%e4 CcCcuxtR Next k Ymvd3> _ #hMS?F| Next j + /+> : p~Wy`g- Next i ZLIt3 EnableTextPrinting( True ) I9
(6 ?Vre"6U 'write out file 4og/y0n,l" fullfilepath = CurDir() & "\" & fname XrUc` Open fullfilepath For Output As #1 d#8 n<NM Print #1, "GRID " & nx & " " & ny r7ebF JEf Print #1, "1e+308" ^sVr#T Print #1, pixelx & " " & pixely :+ZLKm Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 l+nT$IPF VW`SqUl maxRow = nx - 1 _DouVv> maxCol = ny - 1 RCqd2$K"J+ For rowNum = 0 To maxRow ' begin loop over rows (constant X) J7;8
S row = "" ,>p1:pga For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) 9%Eo<+myh row = row & irrad(colNum,rowNum) & " " ' append column data to row string qdnwaJ;& Next colNum ' end loop over columns -DuI
6K -I?8\ Print #1, row xm Ns% 8bJj3vr Next rowNum ' end loop over rows d/Sw.=vq Close #1 do.AesdXaq 4`e[gvh Print "File written: " & fullfilepath X$2f)3 Print "All done!!" <k?pnBI_ End Sub ~pT1,1 q6PG=9d0B 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: d{J@A;da X5pb9zRq R53^3"q~ 找到Tools工具,点击Open plot files in 3D chart并找到该文件 =`ZRPA!aY riZ :#I r2*8.j51 打开后,选择二维平面图: $b~[>S-Q W3zYE3DZf
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