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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。 ^NB@wuf7 pCOr{I\ 成像示意图 " >QNiR! 首先我们建立十字元件命名为Target 6$TE-l yk1syN_ 创建方法:
GU99!.$ >'4Bq*5> 面1 : Vk/CV2 面型:plane ob=GB71j55 材料:Air ]+O];*T 孔径:X=1.5, Y=6,Z=0.075,形状选择Box ?ic 7M .,t"iC:E %zx=rn(K 辅助数据: l?:!G7ie 首先在第一行输入temperature :300K, q.6$-w emissivity:0.1; @[M5$," deR2l(0%yr -=aI!7*"$ 面2 : ]K'iCYY 面型:plane 9V*h:[6a( 材料:Air ; ]GSVv: 孔径:X=1.5, Y=6,Z=0.075,形状选择Box 3-4' x2
F%!ZHE7 Q70LQCms 位置坐标:绕Z轴旋转90度, 0\f3L a qSh^|;2?R V3&_ST 辅助数据: ;C=C`$Q z-*/jFE 首先在第一行输入temperature :300K,emissivity: 0.1; Nq|b$S [4 ^<fN @l~zn%!X Target 元件距离坐标原点-161mm; xh[De}@ `~'yy q Td%[ - 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 8 ;oU{ F.i%o2P3 <`8l8cL 探测器参数设定: OM,-:H, D6
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5Y 在菜单栏中选择Create/Element Primitive /plane }Z5#{Sd jRP.Je@t a>jiq8d]4 DDh$n?2fd x}I'W?g =H&@9=D* 元件半径为20mm*20,mm,距离坐标原点200mm。 &Pu}"M$[MH _JZS;8WYR 光源创建: _Wn5*
Pi%Z {U?UM 光源类型选择为任意平面,光源半角设定为15度。 R(Y4n w+Y-
lIHSy uXPvl5(Y? 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。 ,zmGKn#n2 m{itMZ@ 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。 yZJR7+ O4xV "\
V_*TY6 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。 / 0Z_$Q&e A%S6&!I:( 创建分析面: c%,~1l X2PQL"` u\gPx4]4c 到这里元件参数设定完成,现在我们设定元件的光学属性,在前面我们分别对第一和第二面设定的温度和发射系数,散射属性我们设定为黑朗伯,4%的散射。并分别赋予到面一和面二。 ][R#Q;y< o'S&YD ]DcQ8D 到此,所有的光学结构和属性设定完成,通过光线追迹我们可以查看光线是否可以穿过元件。 fy at-wbb C]{:>= K FRED在探测器上穿过多个像素点迭代来创建热图 B 14Ziopww \yeo-uN8 FRED具有一个内置的可编译的Basic脚本语言。从Visual Basic脚本语言里,几乎所有用户图形界面(GUI)命令是可用这里的。FRED同样具有自动的客户端和服务器能力,它可以被调用和并调用其他可启动程序,如Excel。因此可以在探测器像素点上定义多个离轴光源,及在FRED Basic脚本语言里的For Next loops语句沿着探测器像素点向上和向下扫描来反向追迹光线,这样可以使用三维图表查看器(Tools/Open plot files in 3D chart)调用和查看数据。 yj!4L&A 将如下的代码放置在树形文件夹 Embedded Scripts, S`ms[^-q* #SiOx/ KrNu7/H
打开后清空里面的内容,此脚本为通用脚本适用于一切可热成像的应用。 {VOLUC o 4 Zr`pOUk!4 绿色字体为说明文字, +/ ,J$( IN2FO/Y@ '#Language "WWB-COM" (xnXM}M&2Y 'script for calculating thermal image map 6\4~&+;wL 'edited rnp 4 november 2005 fbaQXM W|S{v7[l 'declarations ^Y"c1f2 Dim op As T_OPERATION cnfjOg'\{ Dim trm As T_TRIMVOLUME 8:V:^`KaSs Dim irrad(32,32) As Double 'make consistent with sampling -A}U^-'a} Dim temp As Double #P8R Dim emiss As Double Ph(bgQg Dim fname As String, fullfilepath As String +[$d9 uzA"+cV5 'Option Explicit E;7vGGf] A8bDg:G1i Sub Main IyvJwrO 'USER INPUTS l*;Isz: nx = 31 FSnF>3kj- ny = 31 vvEr}G numRays = 1000 A1`y_
Aj minWave = 7 'microns Hk)IV"[R maxWave = 11 'microns |fYr*8rH sigma = 5.67e-14 'watts/mm^2/deg k^4 %hcn|-"F fname = "teapotimage.dat" |7G+O+j .6I*=qv)NA Print "" E3X6-J| Print "THERMAL IMAGE CALCULATION" x|
jBn} v[efM8 detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 x^_(gve: 4RgEN!d?H Print "found detector array at node " & detnode G 2L?j iY
@MnnX srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 3R!?r^h |L
XYF$ Print "found differential detector area at node " & srcnode N;4tvWI pa1.+ ~) GetTrimVolume detnode, trm e.X*x4*>~ detx = trm.xSemiApe OV)J dety = trm.ySemiApe !KiN} p area = 4 * detx * dety D,FX&{TYU Print "detector array semiaperture dimensions are " & detx & " by " & dety G,+-}~ $_ Print "sampling is " & nx & " by " & ny SF?Ublc! :{z a[, 'reset differential detector area dimensions to be consistent with sampling NYS|fa pixelx = 2 * detx / nx Y/\y"a pixely = 2 * dety / ny &p>VTD SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False 7s#,.(s Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 EjZ_|Q 1\GS"4~P 'reset the source power <3aiS?i.h SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) [kfLT::mT Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" !1+yb.{\ m0I/X$-Cl5 'zero out irradiance array O>P792) For i = 0 To ny - 1 )HPt(Ck For j = 0 To nx - 1 ILsw' irrad(i,j) = 0.0 :by EXe;3 Next j gmG
M[c \ Next i G[34:J KMFvi_8 'main loop N%8O9Dp8; EnableTextPrinting( False ) ,^]yU?eU 19.+"H ypos = dety + pixely / 2 yk1.fxik' For i = 0 To ny - 1 v[S>
xpos = -detx - pixelx / 2 _T,X z_ ypos = ypos - pixely O3Jp:.ps \F_~?$ EnableTextPrinting( True ) eC+S'Jgf Print i CxyL'k EnableTextPrinting( False ) =uM2l OMaG*fb= AF-4b*oB For j = 0 To nx - 1 xiv1y4(% -)S(eqq1 xpos = xpos + pixelx 1: cD\ 9
U6cM-p? 'shift source @EPO\\C"f LockOperationUpdates srcnode, True TF_~)f(` GetOperation srcnode, 1, op >Q159qZ op.val1 = xpos ZM:!LkK op.val2 = ypos zq(R !a6 SetOperation srcnode, 1, op $9_yD&& LockOperationUpdates srcnode, False XYeuYLut nYfZ[Q>v raytrace ~Q q0 DeleteRays AOvn<Q CreateSource srcnode {yPJYF_l TraceExisting 'draw lIs<&-0 $:v!*0/ 'radiometry 7 (}gs?&w For k = 0 To GetEntityCount()-1
4d\1W?i- If IsSurface( k ) Then okl*pA) temp = AuxDataGetData( k, "temperature" ) -Re4G78% emiss = AuxDataGetData( k, "emissivity" ) -b?yzg,8 If ( temp <> 0 And emiss <> 0 ) Then gpo+-NnG ProjSolidAngleByPi = GetSurfIncidentPower( k ) n\l$R!zr frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) 5 iz(R:P< irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi XMt5o&U1 End If RgF5w<Vd. IaDN[:SX End If Rd 4
z+G A^ :/* Next k t-, =sV
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a@ Next j jrOqspv :fxG]uf-P Next i ;cye
'E EnableTextPrinting( True ) @j|B1:O +7HM7cw 'write out file >^<%9{ fullfilepath = CurDir() & "\" & fname hB]\vA7 Open fullfilepath For Output As #1 wOhiC$E46 Print #1, "GRID " & nx & " " & ny :E$<!q Print #1, "1e+308" "JHdF& Print #1, pixelx & " " & pixely w_O3]; Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 u0Nag=cU v5aHe_?lp maxRow = nx - 1 $)V_oQSqn maxCol = ny - 1 G)vq+L5% For rowNum = 0 To maxRow ' begin loop over rows (constant X) h x_,>\@ row = "" ?3X(`:KB For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) .Xq4QR . row = row & irrad(colNum,rowNum) & " " ' append column data to row string WyO7,Qr\ Next colNum ' end loop over columns DH3.4EUWS g~>g]) Print #1, row Xup"gYTZQ Zx%ib8|j Next rowNum ' end loop over rows 3hN.`G-E Close #1 XOk0_[ G4VdJ(_ Print "File written: " & fullfilepath tC4:cX Print "All done!!" =vqy5y End Sub 9|;"+jlt !uoQLiH+ 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: n!nXM 'G6M:IXno #
p?7{"Ep 找到Tools工具,点击Open plot files in 3D chart并找到该文件 S 54N I UMt^z c^4^z"Mo` 打开后,选择二维平面图: r)9&'m .: zc}qAy'<
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