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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。 `JWYPsWk YD46Z~$ 成像示意图 Uc_`Eh3y 首先我们建立十字元件命名为Target 6!%d-Z7) @=NVOJy}c 创建方法: 5m.KtnT) +yb$[E* 面1 : w}W@M,.^ 面型:plane $wYuH9( 材料:Air _d[2_b1 孔径:X=1.5, Y=6,Z=0.075,形状选择Box ?FV7|)f 37O#aJ,K >!Ap/{2 辅助数据: {nPkb5xbW 首先在第一行输入temperature :300K, RUk<=!U emissivity:0.1; `@$"L/AJ
85|95P.< $}^\=p}X 面2 : MeI2i 面型:plane P10p<@? 材料:Air Dl zmAN 孔径:X=1.5, Y=6,Z=0.075,形状选择Box rX!+@>4_L =WmBpUh X(!AI|6Bt 位置坐标:绕Z轴旋转90度, lv00sa2z QypiF*fSU u3M`'YCb 辅助数据: <RoX| zJw O,=Q1*c,& 首先在第一行输入temperature :300K,emissivity: 0.1; WAwfL? JMirz~%ib yL;o{
G Target 元件距离坐标原点-161mm; YMj7 s3Krob`C5 x0u?*5-t 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 9B+ zJ Vte Jcalf{W6 Nxbd~^j 探测器参数设定: hsHVX[<5` !bZhj3. 在菜单栏中选择Create/Element Primitive /plane r*i$+ Z \3Q:K| m~Y'$3w 6bbZ<E5At =j|v0&
AGC /$FXg;h9$ 元件半径为20mm*20,mm,距离坐标原点200mm。 @ate49W 2vqmsl? 光源创建: $Yx6#m}[M W>`g;[ W 光源类型选择为任意平面,光源半角设定为15度。 t+=1 2{9;f _.d}lK3$2 O)R7t3t 我们将光源设定在探测器位置上,具体的原理解释请见本章第二部分。 8zQ_xE i{tTUA 我们在位置选项又设定一行的目的是通过脚本自动控制光源在探测器平面不同划分区域内不同位置处追迹光线。 =2RhPD +A8=R%&b)[ U^M@um M 功率数值设定为:P=sin2(theta) theta为光源半角15度。我们为什么要这么设定,在第二部分会给出详细的公式推导。 h1^9tz{ 5,HCeN 创建分析面: %~#!NX N,j>;x3xT #&^ZQs< 到这里元件参数设定完成,现在我们设定元件的光学属性,在前面我们分别对第一和第二面设定的温度和发射系数,散射属性我们设定为黑朗伯,4%的散射。并分别赋予到面一和面二。 F=oHl@ .k# N7[q= \LIy:$`8
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。 @9OeC
O =cf{f]N FRED在探测器上穿过多个像素点迭代来创建热图 M&uzOK+ *.kj]BoO 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。 P$p@5 hl 将如下的代码放置在树形文件夹 Embedded Scripts, sg3h i"Im m>]>$=% o"'iXUJ 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。 OJMvn'y )^t!|*1LA 绿色字体为说明文字, *'Z-OY<V >Hdjsu5{N '#Language "WWB-COM" 6RK ~Dl&g 'script for calculating thermal image map i Td-n9 'edited rnp 4 november 2005 25x cD1* /a@ k S 'declarations CnabD{uTf Dim op As T_OPERATION y._'K+nl Dim trm As T_TRIMVOLUME Z:I*y7V- Dim irrad(32,32) As Double 'make consistent with sampling =y?#^ Dim temp As Double %
2I Dim emiss As Double 9aT L22U? Dim fname As String, fullfilepath As String |WB"=PE ^[ET&" 'Option Explicit Y{,2X~ 7 j h;
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[ Sub Main ^fkCyE;= 'USER INPUTS n4^*h4J7 nx = 31 N1PECLS? ny = 31 M[A-1]' numRays = 1000 0r1g$mKb minWave = 7 'microns m'd^?Qc maxWave = 11 'microns g<fP:/ sigma = 5.67e-14 'watts/mm^2/deg k^4 Gu2_dT fname = "teapotimage.dat" ]} '^` ,,S9$@R Print "" }.'Z=yy Print "THERMAL IMAGE CALCULATION" zCBplb f:xUPH?+ detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 Z,3 CC \ f7Yz>To Print "found detector array at node " & detnode -<6v:Z !&W|myN^ srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 A
6 :Q< USprsaj Print "found differential detector area at node " & srcnode 4 &|C} 5Yl6? GetTrimVolume detnode, trm +i+tp8T+7 detx = trm.xSemiApe -)X{n?i dety = trm.ySemiApe
pL~=Z?(B area = 4 * detx * dety ?gLAWz Print "detector array semiaperture dimensions are " & detx & " by " & dety zyDZ$Dhka Print "sampling is " & nx & " by " & ny ~]4kkm7Y .vK.XFZ8R 'reset differential detector area dimensions to be consistent with sampling TaOOq}8c# pixelx = 2 * detx / nx WJAYM2
6\ pixely = 2 * dety / ny 9/G!0uE SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False ^+M><jE9 Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 7ZQ'h3K Hr6wgYPi 'reset the source power }hCaNQ&jH SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) y5_XHi@u~o Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" [g +y_@9s ~Yl<S(/4 'zero out irradiance array z`OkHX*+2| For i = 0 To ny - 1 H-Pq!9[DB For j = 0 To nx - 1 ^T{8uJ'kn irrad(i,j) = 0.0 b{BaQ>.(` Next j u%xDsTDP Next i b"t")U== ~6kJ~R4 'main loop O] H=s EnableTextPrinting( False ) uWTN2jr k Q~ %=pn ypos = dety + pixely / 2 EMhr6</ For i = 0 To ny - 1 .liyC~YW xpos = -detx - pixelx / 2 Q<yAT(w ypos = ypos - pixely 8[~~gYl \e|U9;Mf EnableTextPrinting( True ) pisB,wP$2 Print i 0Z,{s158L EnableTextPrinting( False ) ,%Z&*n n$YE !D' P_}/#N{C For j = 0 To nx - 1 )tD6=Iz^5 U. (Tl>K|0 xpos = xpos + pixelx 5DOE3T`^Oc 0I
@$ 0Gg 'shift source >t0%?wj)Y LockOperationUpdates srcnode, True +2Ql~w@$^l GetOperation srcnode, 1, op 61Bhm:O5W op.val1 = xpos [sj VRW- op.val2 = ypos )v1CC.. SetOperation srcnode, 1, op .'/l'> LockOperationUpdates srcnode, False Yx),6C3 sB6dpD 'raytrace Gqt-_gga DeleteRays FsY(02 CreateSource srcnode D%U:!|G TraceExisting 'draw _f3
WRyN0 z]$>+MH_ 'radiometry SX+4HJB For k = 0 To GetEntityCount()-1 @KA1"Wb_ If IsSurface( k ) Then %`+'v_iu temp = AuxDataGetData( k, "temperature" ) !| xZ6KV emiss = AuxDataGetData( k, "emissivity" ) wbi3lH:; If ( temp <> 0 And emiss <> 0 ) Then Qn.[{rw ProjSolidAngleByPi = GetSurfIncidentPower( k ) QrC/ssf} frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) M6Pw/S! irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi ,H39V+Y* End If XsUUJuCG ],[)uTZc End If 9P.(^SD][z J>%t<xYf4 Next k d0
-~|`5 M3(k'q7&: Next j 6Y7H|>g) C),7- ? Next i TsHF
tj9S EnableTextPrinting( True ) kXwi{P3D$ :<GfET Is 'write out file L2fVLKH fullfilepath = CurDir() & "\" & fname JMlV@t7y< Open fullfilepath For Output As #1 *vnXlV4L Print #1, "GRID " & nx & " " & ny yN\e{;z` Print #1, "1e+308" }1U*A#aN7K Print #1, pixelx & " " & pixely ?2ItB `<( Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 9&K/GaG 2\0Oji\6 maxRow = nx - 1 tg 85: maxCol = ny - 1 ^u)rB<#BR For rowNum = 0 To maxRow ' begin loop over rows (constant X) OOB^gf}$' row = "" m<: IFx# For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) -@M3Dwsi3 row = row & irrad(colNum,rowNum) & " " ' append column data to row string RUGv8"j Next colNum ' end loop over columns ~Ltr.ci JE!("]& Print #1, row u9]1X1wV )X5(#E Next rowNum ' end loop over rows XmWlv{T+ Close #1 }
`T8A v <Hb-~ Print "File written: " & fullfilepath T?npQA07= Print "All done!!" tln1eN((q End Sub G{RTH_p V1utUGJV 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: Qhy#r y3IWfiz>/d B~TN/sd 找到Tools工具,点击Open plot files in 3D chart并找到该文件 qn"K9k }c|U X
ZW %8FN0 打开后,选择二维平面图: q`Q}yE>9 l,d, T
QQ:2987619807 6G_<2bO
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