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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。 9,w}Xe=C n3*UgNg%fK 成像示意图 L!&$c&=xf 首先我们建立十字元件命名为Target
rWqkdi1 cP,;Qbe 创建方法: ,b:n1 2k+=kt 面1 : | yS5[?.` 面型:plane /<6ywLD 材料:Air zdqnL^wb 孔径:X=1.5, Y=6,Z=0.075,形状选择Box ;C+cE# =p5?+3"@ {vLTeIxf.G 辅助数据: (lieiye^ 首先在第一行输入temperature :300K, 6EZ1YG} emissivity:0.1; z;ULQ 8znj~7}# 0n\^$WY 面2 : Oq[i & 面型:plane 'xQna+ %h 材料:Air /z..5r^,ZZ 孔径:X=1.5, Y=6,Z=0.075,形状选择Box L#`7 FaM? UBL(N r >1m)%zt 位置坐标:绕Z轴旋转90度, lD9%xCo9( g&q]@m fVG$8tB 辅助数据: -g9^0V`G v'h3CaA9j 首先在第一行输入temperature :300K,emissivity: 0.1; l_bL,-|E8 N?\bBt@ (%6(5,
Target 元件距离坐标原点-161mm; #"hJpyW 4V -QN1oK@\mE /tG 5!l 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 ^WmGo]<B_ *1\z^4=a] C:rRK* 探测器参数设定: D~5yj&&T; GSC{F#:z 在菜单栏中选择Create/Element Primitive /plane i5.?g <.H '`9%'f) 1NuR/DO Hde]DK,d z Z@L4ZT '$n:CNha 元件半径为20mm*20,mm,距离坐标原点200mm。 tCuN?_UG 2T//%ys= 光源创建: f#'8"ff*1 gTqeJWX9wP 光源类型选择为任意平面,光源半角设定为15度。 oK#\HD4U zv$Gma_ g Cg4;b6g 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。 ;RNM f-vZ2+HP 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。 8$2l^ w9G_>+?E 5dg-d\6S 功率数值设定为:P=sin2(theta) theta为光源半角15度。我们为什么要这么设定,在第二部分会给出详细的公式推导。 /!^L69um )w
Z49>Y 创建分析面: M4zX*&w.T BO?mQu~ nu;}S!J 到这里元件参数设定完成,现在我们设定元件的光学属性,在前面我们分别对第一和第二面设定的温度和发射系数,散射属性我们设定为黑朗伯,4%的散射。并分别赋予到面一和面二。 [B}1z !S~,>,yd bc
`UA 到此,所有的光学结构和属性设定完成,通过光线追迹我们可以查看光线是否可以穿过元件。 hZp=BM"bJ <^CYxy FRED在探测器上穿过多个像素点迭代来创建热图 mY$nI -P }%-UL{3% 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。 @PT`CK} 将如下的代码放置在树形文件夹 Embedded Scripts, f%bc64N( fKPiRlLS ZmEG<T05 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。 JN{<oxI \?bwm&6+r 绿色字体为说明文字, ?l6>6a7 HF*j`} '#Language "WWB-COM" 1;cv-W 'script for calculating thermal image map &_<VZS 'edited rnp 4 november 2005 Am>_4 Zk~nB}Xw 'declarations s,1pZT <E Dim op As T_OPERATION "WF(
6z# Dim trm As T_TRIMVOLUME skk-.9 Dim irrad(32,32) As Double 'make consistent with sampling EO4"Z@ji Dim temp As Double >Sc$R0 Dim emiss As Double /W"Bf Dim fname As String, fullfilepath As String s,eld@ xaGVu0q 'Option Explicit r4;5b s6wm MILIu;[{#r Sub Main ddUjs8VvJ 'USER INPUTS 2x)0?N[$O nx = 31 Jo6~r- ny = 31 /2g)Z!&+L numRays = 1000 Ft3N#!ubl minWave = 7 'microns tb-OKZq maxWave = 11 'microns Q3B'-BZe sigma = 5.67e-14 'watts/mm^2/deg k^4 '_q: vjX fname = "teapotimage.dat" uznoyj6g *k3 d^9o# Print "" Bg+<*z-?e Print "THERMAL IMAGE CALCULATION" xFsB?d 3e!3.$4M detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 zCK y`u. )'BJ4[aq\ Print "found detector array at node " & detnode rK(x4]I
l" 2+T 8Y,g srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 s,UN'~e1 &+E'1h10 Print "found differential detector area at node " & srcnode f_i"/xC-/ BiHiVhD_ GetTrimVolume detnode, trm &rl]$Mtt detx = trm.xSemiApe {Y3_I\H8{ dety = trm.ySemiApe xJ[k#?T' area = 4 * detx * dety m
wRLzN Print "detector array semiaperture dimensions are " & detx & " by " & dety l5\B2 +}7 Print "sampling is " & nx & " by " & ny ^7ea6G" ch5`fm 'reset differential detector area dimensions to be consistent with sampling br34Eh pixelx = 2 * detx / nx &xGfkCP.] pixely = 2 * dety / ny "oE^R?m SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False Y{Y;EY4 Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 1jUhG2y ^*cMry 'reset the source power v @$evmA SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) h}anTFKP Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" %468s7Q[Mi b2/N H1A 'zero out irradiance array C>w9
{h For i = 0 To ny - 1 X] JpS For j = 0 To nx - 1 p:[`%<j0 irrad(i,j) = 0.0 ADLa.{ Next j ;+r) j"W Next i )AnlFO+V Ac5o K 'main loop wZ]BY; EnableTextPrinting( False ) Oi
kU$~| L#7)X5a__ ypos = dety + pixely / 2 F$6])F For i = 0 To ny - 1 S1H47<)UF xpos = -detx - pixelx / 2 Kh:#S|
ypos = ypos - pixely K\^&_#MG 7U{b+=,wK EnableTextPrinting( True ) )F%wwc^r Print i rx}ujjx EnableTextPrinting( False ) -~<q,p"e x;ICV%g/ |7S4; For j = 0 To nx - 1 =& Tu`m #U!(I#^3 xpos = xpos + pixelx 8CnI%_Su ZyS;+" 'shift source ~x0-iBF LockOperationUpdates srcnode, True \c9t]py<.h GetOperation srcnode, 1, op pE(<XD3Q op.val1 = xpos I7q?V1fu4 op.val2 = ypos ld!6|~0U SetOperation srcnode, 1, op /v
bO/Mr LockOperationUpdates srcnode, False RK~FT/ K)h"G#NZM raytrace I*vj26qvg DeleteRays XZep7d} CreateSource srcnode _ntW}})K TraceExisting 'draw *xv/b= 9?}rpA`P 'radiometry *0&i'0> For k = 0 To GetEntityCount()-1 (1elF) If IsSurface( k ) Then t5X^(@q4N temp = AuxDataGetData( k, "temperature" ) ^+-L;XkeY emiss = AuxDataGetData( k, "emissivity" ) S,"ChR If ( temp <> 0 And emiss <> 0 ) Then }<\65 B$1 ProjSolidAngleByPi = GetSurfIncidentPower( k ) D25gg frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) ;8;~C" irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi Gh gvRR$ End If RZV1:hNN pZ_FVID End If OuBMVn #o r7T^ Next k Z z;<P ~\)&{' Next j ,a]~hNR*X G%p!os\> Next i qh(-shZ4Du EnableTextPrinting( True ) e@2Vn? 5 T24#gF~ 'write out file 2;?wN`}5g= fullfilepath = CurDir() & "\" & fname WW\)B-}T Open fullfilepath For Output As #1 QnP?; Print #1, "GRID " & nx & " " & ny hml\^I8Q>F Print #1, "1e+308" H8t{ >C)] Print #1, pixelx & " " & pixely Sj{rvW Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 p\]LEP\z, &W!d}, ;
maxRow = nx - 1 l>5]Wd{/ maxCol = ny - 1 { Sliy' For rowNum = 0 To maxRow ' begin loop over rows (constant X) eZ.0,A*1B1 row = "" 2`FsG/o\T~ For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) ANpY qV row = row & irrad(colNum,rowNum) & " " ' append column data to row string 3Ibt'$dK Next colNum ' end loop over columns xwH|ryfs,Z B> "r -O Print #1, row E-U;8cOMv <C.$Db&9 Next rowNum ' end loop over rows G|G?h Close #1 U*R~w5W.[ ^`>Ysc(@& Print "File written: " & fullfilepath |v%RjN Print "All done!!" Znl>*e/| End Sub u&d v[ DHumBnQ 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: ^SSOh# Pl5NHVr KGE-RK 找到Tools工具,点击Open plot files in 3D chart并找到该文件 L^al1T v!RB(T3 QWW7I.9r 打开后,选择二维平面图: >/HU' 69I.*[
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