| infotek |
2022-01-24 09:30 |
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。 {x[C\vZsi] ,2i1 4H
成像示意图 4L4u< 首先我们建立十字元件命名为Target ]scr@e h|ib*%P_ 创建方法: Bn=YGEvz )vg@Kc26 面1 : %qqeL 面型:plane hJw]hVYa 材料:Air @`Dh7Q 孔径:X=1.5, Y=6,Z=0.075,形状选择Box 3H4T*&9;n ,S@B[+VZ
.|TF /b] 辅助数据: \q24E3zS& 首先在第一行输入temperature :300K, vq-;wdq?2 emissivity:0.1; qK~]au:C -%K}~4J ^ P
A|RFP 面2 : {a9.0N :4 面型:plane +^J;ic 材料:Air LfK/wSvWw 孔径:X=1.5, Y=6,Z=0.075,形状选择Box {i3=N{5b ">S1,rhgS
bk i:u 位置坐标:绕Z轴旋转90度, E @Rb+8}," }#Iqq9[
aD6!x3c/ 辅助数据: PGVp1TQ sb1tQ=u[ 首先在第一行输入temperature :300K,emissivity: 0.1; *"6A>:rQs f8UO`*O f.E{s*z> Target 元件距离坐标原点-161mm; !1]jk(Z KZaiy*>)
zzh7 "M3Qn 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 F&3 :]1 }jFRuT;35 'P4V_VMK 探测器参数设定: O#>,vf$ v:>sS_^ 在菜单栏中选择Create/Element Primitive /plane z8)&ekG V%C'@m(/SZ
;vWJOvM2 +Mn(s36f2 k)8*d{ * 77 Z:!J| 元件半径为20mm*20,mm,距离坐标原点200mm。 `bn@;7`X t#-4edB, 光源创建: B)0;gWK &g0r#K 光源类型选择为任意平面,光源半角设定为15度。 l2wu>Ar7. 3hzz*9/n 9VIAOky- 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。 L}_VT
J q6%m .X7 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。 %N\8!aXnf :3J`+V}9; 04}c_XFFE 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。 /7Q9(} oJ#;X R 创建分析面: 2uF'\y 8)83j6VF ST4[d'|j 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。 }?O>.W,/ [<Mls@?
9o]!D,u8=5 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。 Z]5xy_La PfhKomt" FRED在探测器上穿过多个像素点迭代来创建热图 qzSm]l?z r CUs 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。 +HD2]~{EkL 将如下的代码放置在树形文件夹 Embedded Scripts, YhN:t? 58`Dcx,yJ
a\B?J 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。 3J3wKw!` 9c5DEq 绿色字体为说明文字, Tq6\oIBkV xsvJjs;= '#Language "WWB-COM" A-M6MW 'script for calculating thermal image map [8 23w.{]# 'edited rnp 4 november 2005 -afNiNiY };gcM@]]E 'declarations \vpX6!T Dim op As T_OPERATION y7'9KQ Dim trm As T_TRIMVOLUME
?dk)2 Dim irrad(32,32) As Double 'make consistent with sampling BXytAz3 Dim temp As Double rf!i?vAe Dim emiss As Double kp6 &e Dim fname As String, fullfilepath As String Ksk[sf?J& ="AaC!E,W 'Option Explicit RS2uk7MB !|mzu1S Sub Main vJX0c\e 'USER INPUTS w.+G+r= nx = 31 o,$K=#Iv ny = 31 )t2 eg1a: numRays = 1000 Ac}5, minWave = 7 'microns BJp~/H`vd maxWave = 11 'microns dkQP.Tj$i sigma = 5.67e-14 'watts/mm^2/deg k^4 3]7j,1^ fname = "teapotimage.dat" @jZ1WHS_a Ak3V< =gx Print "" C[><m2T Print "THERMAL IMAGE CALCULATION" /8 "rCh|m- {GGP8 detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 0])[\O`j AMK(-= Print "found detector array at node " & detnode vVjk9_Ul I:;umyRH srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 |>wGl 5d-rF:# Print "found differential detector area at node " & srcnode XXXQA Y-,C B!4~A{ GetTrimVolume detnode, trm g]d0B!Ar~ detx = trm.xSemiApe !';;q dety = trm.ySemiApe ,=: -&~? area = 4 * detx * dety H6lZ<R{= Print "detector array semiaperture dimensions are " & detx & " by " & dety LYyud Print "sampling is " & nx & " by " & ny 4MCj*ok< iAt&927 'reset differential detector area dimensions to be consistent with sampling ]UGk"s5A pixelx = 2 * detx / nx {9cjitl pixely = 2 * dety / ny w=5<mw SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False P]2V~I/X Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 .kB!',v\ #1WCSLvtV 'reset the source power `(E$-m-~jH SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) [*
|+ it+! Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" "kjSg7m*: Y<_;8%S 'zero out irradiance array c IPOI'3d For i = 0 To ny - 1 \Qf2:[-V0 For j = 0 To nx - 1 |3`8$- irrad(i,j) = 0.0 VL|Z+3L Next j HI,`O Next i *n6L3"cO MHA_b^7? 'main loop I^[[*Bh*C EnableTextPrinting( False ) 7"OJ,Mx% B`)bo}h ypos = dety + pixely / 2 '($$-P\/ For i = 0 To ny - 1 1Vs>G xpos = -detx - pixelx / 2 F
1l8jB\ ypos = ypos - pixely `v)ZOw9& F45-M[z EnableTextPrinting( True ) JoD@e[( Print i o/&
IT(v EnableTextPrinting( False ) N*)O_Ki OP\L TIK'A< For j = 0 To nx - 1 F3L+X5D.yu t/l<X]o xpos = xpos + pixelx ]zn3nhBI yet~ 'shift source \9`.jB~< LockOperationUpdates srcnode, True T 2Yc` + GetOperation srcnode, 1, op d\25 op.val1 = xpos o'8nQ
Tao op.val2 = ypos _hMFmI=r[ SetOperation srcnode, 1, op 7y_<BCx
h LockOperationUpdates srcnode, False D0>Pc9 }'K-1: raytrace GInw7 DeleteRays 1MmEP CreateSource srcnode _(I)C`8m TraceExisting 'draw ls~9qkAyLx 3eB)X2~ 'radiometry z[y For k = 0 To GetEntityCount()-1 p|@#IoA/e If IsSurface( k ) Then 9SJSUv:@ temp = AuxDataGetData( k, "temperature" ) =ADOf_n} emiss = AuxDataGetData( k, "emissivity" ) @uanej0q7 If ( temp <> 0 And emiss <> 0 ) Then OL_jU2,fv ProjSolidAngleByPi = GetSurfIncidentPower( k ) :zNNtv iA frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) M27H{}v irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi 2\;/mQI2A End If /y6I I$AvM Sh?eb End If &9"Y:), B{p74
> Next k dGz4`1(> 6YV"H Next j O%haaL\ %0Qq~J@Lu Next i (/s~L*gF{ EnableTextPrinting( True ) z 7+>G/o \L`x![$~q 'write out file *LuRo fullfilepath = CurDir() & "\" & fname A;dD'Kgl Open fullfilepath For Output As #1 X4Pm&ol Print #1, "GRID " & nx & " " & ny +L@\/=;G Print #1, "1e+308" w'E?L`c Print #1, pixelx & " " & pixely $cU7)vmK` Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 /)kx`G_ E VC]B} maxRow = nx - 1 RD=V`l{Z maxCol = ny - 1 {m@tt{% For rowNum = 0 To maxRow ' begin loop over rows (constant X) 7[!dm_ row = "" B9%%jEH* For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) \Hf/8!q row = row & irrad(colNum,rowNum) & " " ' append column data to row string Bf6i{`!G Next colNum ' end loop over columns "_&c[VptWi B*w]yL( Print #1, row X8-x$07) X$6QQnyR Next rowNum ' end loop over rows Y=g]\%-PB Close #1 s`0IyQXVU M"bG(a(6: Print "File written: " & fullfilepath Tku6X/LF Print "All done!!" gS@<sO$d> End Sub 7#NHPn ]>Gi_20*. 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: I)s_f5' `w`F-ke]I #TC}paIpj 找到Tools工具,点击Open plot files in 3D chart并找到该文件 w7&.Uqjf YDj5+'y #Sx 打开后,选择二维平面图: 4nQ5zwiV E@n~ @|10
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