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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。 4ss&'h C6K|:IK{ 成像示意图 <O \tC81 首先我们建立十字元件命名为Target l5FuMk- Q3'fz 9v 创建方法: +"k.E
x0: cm@jt\D 面1 : TpJg-F 面型:plane cr76cYq"Q 材料:Air [NHg&R H 孔径:X=1.5, Y=6,Z=0.075,形状选择Box E|HSwTHe ^y&q5p jj t2=a(N-/, 辅助数据: 8O~0RYk 首先在第一行输入temperature :300K, gW%pM{PW emissivity:0.1; TA Ftcs: {V}t'x`4c If~95fy~c 面2 : C-Nuy1o 面型:plane H"#)&a7 材料:Air n11LxGwk 孔径:X=1.5, Y=6,Z=0.075,形状选择Box \bU` *-?Wcz Of-C 位置坐标:绕Z轴旋转90度, c*N50%=4 j(0Ilx|7v "/Y<G 辅助数据: mbF(tSy w?kGi>7E 首先在第一行输入temperature :300K,emissivity: 0.1; <(fdHQD!7> 4F}Pu<; ETM2p1ru0 Target 元件距离坐标原点-161mm; 6XdWm '#O;mBPNi Dq?E\ 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 &svx@wW ~ct2`M$TL( RG&I\DTyt 探测器参数设定: I`22Zwq: Y^QKp" 在菜单栏中选择Create/Element Primitive /plane -7k[Vg? z(+&wa gXLCRn!iR 3FFaEl \,2gTi,= vwVVBG;t 元件半径为20mm*20,mm,距离坐标原点200mm。 y>$1UwQ QS^~77q 光源创建: tE[H8 P^"R4T 光源类型选择为任意平面,光源半角设定为15度。 d]8_l1O (/&;jV2DD[ im8
-7Xt 我们将光源设定在探测器位置上,具体的原理解释请见本章第二部分。 /-Wuq`P/ T _l<mu? " 我们在位置选项又设定一行的目的是通过脚本自动控制光源在探测器平面不同划分区域内不同位置处追迹光线。 0mTEim )Nbc/nB$ j?xk& 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。 O16r!6=-n @M=$qO_$9 创建分析面: Dzr e' t)} \9^Uo
rIVvO 到这里元件参数设定完成,现在我们设定元件的光学属性,在前面我们分别对第一和第二面设定的温度和发射系数,散射属性我们设定为黑朗伯,4%的散射。并分别赋予到面一和面二。 q]TqI' o cJ.
7Mt \ZMP_UU( 到此,所有的光学结构和属性设定完成,通过光线追迹我们可以查看光线是否可以穿过元件。 UgC)7
K1 oE1M/*myS FRED在探测器上穿过多个像素点迭代来创建热图 ll%G!VR #F!Kxks FRED具有一个内置的可编译的Basic脚本语言。从Visual Basic脚本语言里,几乎所有用户图形界面(GUI)命令是可用这里的。FRED同样具有自动的客户端和服务器能力,它可以被调用和并调用其他可启动程序,如Excel。因此可以在探测器像素点上定义多个离轴光源,及在FRED Basic脚本语言里的For Next loops语句沿着探测器像素点向上和向下扫描来反向追迹光线,这样可以使用三维图表查看器(Tools/Open plot files in 3D chart)调用和查看数据。 m<{"}4' 将如下的代码放置在树形文件夹 Embedded Scripts, qz`rL#W] Ad/($v5+ r!kLV )_ 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。 Nt~x&s mZ7B<F[qV 绿色字体为说明文字, 96=Z" n?:2.S.8 '#Language "WWB-COM" !MoOKW 'script for calculating thermal image map qBYg[K> 'edited rnp 4 november 2005 mw4JQ\ 4z_n4= 'declarations IE;\7r+h Dim op As T_OPERATION #dxvz^2V.3 Dim trm As T_TRIMVOLUME q jz3<`7- Dim irrad(32,32) As Double 'make consistent with sampling q>-R3HB Dim temp As Double ZVL
gK}s Dim emiss As Double {E51Kv&_ Dim fname As String, fullfilepath As String &s8<6P7 <
bFy(+ 'Option Explicit tuxRVV8l BSgTde|3y Sub Main vd (?$ 'USER INPUTS ?YBaO,G9o nx = 31 X?/Lz;,& ny = 31 Z5B/|{ numRays = 1000 uw33:G minWave = 7 'microns ?Vc0) maxWave = 11 'microns ETfF5i} sigma = 5.67e-14 'watts/mm^2/deg k^4 HCj>,^<h fname = "teapotimage.dat" w2OsLi Sv AbfZ++aJ Print "" ~}Z'0W)Q`z Print "THERMAL IMAGE CALCULATION" I9&lO/c0 ?:igumeYX detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 M'2r@NR8 Svw<XJ Print "found detector array at node " & detnode S!hXf|*0[ ,Dp0fauJ srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 qTM%G- TH4\HY9qa? Print "found differential detector area at node " & srcnode =6\LIbO eT[&L @l]b GetTrimVolume detnode, trm F*` t"7Lm detx = trm.xSemiApe x[X`a dety = trm.ySemiApe 0V`[Zgf area = 4 * detx * dety I[D8""U Print "detector array semiaperture dimensions are " & detx & " by " & dety m`}{V5; Print "sampling is " & nx & " by " & ny n]y EdL/1 C6jR=@42Q 'reset differential detector area dimensions to be consistent with sampling 7-*=|gl+ pixelx = 2 * detx / nx ?S tsH pixely = 2 * dety / ny 6B6vP%H# SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False ho.(v;
Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 vzXag*0
3t"4TjAy 'reset the source power 0L#/lDNk SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) VhEka# Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" y1pu R7 57Z- 'zero out irradiance array wCCV2tk For i = 0 To ny - 1 lV6dm=k For j = 0 To nx - 1 Zu/<NC
( irrad(i,j) = 0.0 i9 A ~< Next j Riry_
Next i rs-,0'z,7 I#G0, &Gv 'main loop C6
" EnableTextPrinting( False ) {5j66QFoo d
6t:hn ypos = dety + pixely / 2 %,UPJn For i = 0 To ny - 1 {whvTN1#dh xpos = -detx - pixelx / 2 X+82[Y,mB. ypos = ypos - pixely k)7{Y9_No 09h.1/ EnableTextPrinting( True ) (gXN%rsY Print i #FH[hRo=6 EnableTextPrinting( False ) w$ fJ4+ se9>.}zZN z#6?8y2- For j = 0 To nx - 1
QLKK.] l"+Jc1\ X xpos = xpos + pixelx \6!W05[ Q q3P+9/6 'shift source ]$b2a&r9 LockOperationUpdates srcnode, True ~nY]o"8D GetOperation srcnode, 1, op z rfUQO op.val1 = xpos mUoIJ3fv_, op.val2 = ypos 3V<&| SetOperation srcnode, 1, op s!B/WsK LockOperationUpdates srcnode, False B.dT)@Lx0 :iF%cy. raytrace >3.X? DeleteRays g(E"4M@t! CreateSource srcnode 9Ul(GI( TraceExisting 'draw jp2Q9Z 0JjUAxNq 'radiometry (eWPis[ For k = 0 To GetEntityCount()-1 f!_
ctp If IsSurface( k ) Then Dt|)=a temp = AuxDataGetData( k, "temperature" ) 60>.ul2 emiss = AuxDataGetData( k, "emissivity" ) /j2H A^GT If ( temp <> 0 And emiss <> 0 ) Then 2f~($}+* ProjSolidAngleByPi = GetSurfIncidentPower( k ) 3G}AH E4 frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) @.C{OSHE irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi \wvg,j= End If `Ityi} e^1uVN End If <n"C, ` uCI Xb Next k j]rz] k IH*s8tPc Next j cC{"<fYF z(y*hazK Next i GEUg]nw EnableTextPrinting( True ) 07v!Zj %kshQ%P)? 'write out file SGL|Ck fullfilepath = CurDir() & "\" & fname 0MF}^"R Open fullfilepath For Output As #1 yR5XJ;Tct Print #1, "GRID " & nx & " " & ny ,M5}4E7L%s Print #1, "1e+308" `{v?6:G:Q Print #1, pixelx & " " & pixely sBX-X$*N Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 $FTO !U%T&?E l maxRow = nx - 1 I^\&y(LJF maxCol = ny - 1 =@x`?oe v For rowNum = 0 To maxRow ' begin loop over rows (constant X) ),:c+~@@kT row = "" V N{NA+I For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) k44Q):ncY7 row = row & irrad(colNum,rowNum) & " " ' append column data to row string bPKOw< Next colNum ' end loop over columns k;W@LfP nuQ]8- , Print #1, row 68fiG Hy:V`> Next rowNum ' end loop over rows &C<yfRDu Close #1 5Z/7kU=I q/9H..6 Print "File written: " & fullfilepath Jb_1LZ)] Print "All done!!" K kW;-{c End Sub 9LnN$e rf:XRJ<4 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: z+}QZ> y;cUl, :v _n8GWBi 找到Tools工具,点击Open plot files in 3D chart并找到该文件 eYUr-rN+)z .jw}JJ 6DIZ@ oi 打开后,选择二维平面图: f>o,N{| #hfuH=&oh
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