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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。 fhp<oe>D 7cO n9fIE 成像示意图 *
%M3PTY\ 首先我们建立十字元件命名为Target Nkl_Ho, ^Z#W_R\l 创建方法: FPI;Jx6W' F\k+[`%{ 面1 : {v2|g 面型:plane ?zVL;gVWA 材料:Air G *;a^]- 孔径:X=1.5, Y=6,Z=0.075,形状选择Box .!,z:l$Kh :Q_<Z@2Y{ [uls8
"^/j 辅助数据: oMTf"0EIW 首先在第一行输入temperature :300K, c|62jY"$-2 emissivity:0.1; /)(#{i* Jesjtcy<* rT5Ycm@ 面2 : ~UjGSO)z} 面型:plane e\JojaV 材料:Air
{=QiZWu 孔径:X=1.5, Y=6,Z=0.075,形状选择Box GBFtr /_Z652@ WjwLM2<nK7 位置坐标:绕Z轴旋转90度, o1Q7Th :!b'Vk {0^&SI"5`E 辅助数据: yz*6W
z D Yf~{I-|`q 首先在第一行输入temperature :300K,emissivity: 0.1; .?e\I`Kk^' pV,P|>YTf +d!v}aJ Target 元件距离坐标原点-161mm; FMkzrs oK%K}{` 09kt[
单透镜参数设定:F=100, bend=0, 位置位于坐标原点
$g+[yb7@ Xo*%/0q' sx51X^d 探测器参数设定: u(t#Ze~Y1 CL}{mEr} 在菜单栏中选择Create/Element Primitive /plane
ZRVT2VfN ;cz|ss= YH_7=0EJ %ck]S!}6 `zt_7MD z,:a8LB#[ 元件半径为20mm*20,mm,距离坐标原点200mm。 fpN-
o (%o2jroQ# 光源创建: R%
,<\d7 F]t(%{#W 光源类型选择为任意平面,光源半角设定为15度。 ]t*[%4 ,b;{emX h F.=Bnw/- 我们将光源设定在探测器位置上,具体的原理解释请见本章第二部分。 {$^DMANDx Mz;[ +p 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。 ?9=9C"&s 2'<[7! u=/CRjot 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。 _fP&&} )){9&5,0: 创建分析面: }sFm9j7yR S#Sb ] F0UVo 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。 Tl|:9_:t (V% `k'N7f la?Wnw 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。 hy T1xa 9bq<GC'eX8 FRED在探测器上穿过多个像素点迭代来创建热图 $<|lE/_] j]m|7] FRED具有一个内置的可编译的Basic脚本语言。从Visual Basic脚本语言里,几乎所有用户图形界面(GUI)命令是可用这里的。FRED同样具有自动的客户端和服务器能力,它可以被调用和并调用其他可启动程序,如Excel。因此可以在探测器像素点上定义多个离轴光源,及在FRED Basic脚本语言里的For Next loops语句沿着探测器像素点向上和向下扫描来反向追迹光线,这样可以使用三维图表查看器(Tools/Open plot files in 3D chart)调用和查看数据。 rJInj>|{= 将如下的代码放置在树形文件夹 Embedded Scripts, %9#gB .pvV1JA' u}|%@=xn 打开后清空里面的内容,此脚本为通用脚本适用于一切可热成像的应用。 2JS`Wqy awUx=%ERtA 绿色字体为说明文字, *8tI*Pus ([VV%ovZ
'#Language "WWB-COM" nbTVU+ 'script for calculating thermal image map )
(Tom9^ 'edited rnp 4 november 2005 {gaai `H3.,] 'declarations =@5x"MOz Dim op As T_OPERATION ;eZ#b jw-d Dim trm As T_TRIMVOLUME ZB[Qs Dim irrad(32,32) As Double 'make consistent with sampling +EM_TTf4 Dim temp As Double UYtuED Dim emiss As Double :g\rQazxO Dim fname As String, fullfilepath As String oq_6L\
~ 35x 0T/8 'Option Explicit leiW4Fj %&\ jOq~ Sub Main =0'q!}._! 'USER INPUTS 5Fm=/o1 nx = 31 A;u" <KG? ny = 31 "uPy,<l numRays = 1000 h`}3h<
8 minWave = 7 'microns 2n`Lg4=
maxWave = 11 'microns H_IGFZ Ch sigma = 5.67e-14 'watts/mm^2/deg k^4 s
Fgadz6O fname = "teapotimage.dat" L {ymI)Y^ mEuHl> Print "" Yp4c'Zk Print "THERMAL IMAGE CALCULATION" 5H:@8,B ; W7Y2Md detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 /MOnNnV %E27.$E_ Print "found detector array at node " & detnode Cv=GZGn- ~tGCLf]c\ srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 |H ;+1 G7* h{nE Print "found differential detector area at node " & srcnode &}`K^5K|O: Cj;/Uhs
GetTrimVolume detnode, trm [ev-^[ detx = trm.xSemiApe XvSIWs dety = trm.ySemiApe Z]:BYX' area = 4 * detx * dety a1MFjmq Print "detector array semiaperture dimensions are " & detx & " by " & dety 5QWNZJ&}d Print "sampling is " & nx & " by " & ny =<<3Pkv7@ oaDsk<(j;R 'reset differential detector area dimensions to be consistent with sampling Vul+]h[!h pixelx = 2 * detx / nx C/v}^#cLD pixely = 2 * dety / ny 2go> SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False =`I?mn& Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 P?3{z="LzJ uiBTnG" 'reset the source power mPVE?jnR^0 SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) D(r:}pyU Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" "6I[4U"@ s=EiH 'zero out irradiance array hE!7RM+Y For i = 0 To ny - 1 ?(im+2 For j = 0 To nx - 1 +CTmcbyOi irrad(i,j) = 0.0 <uF [, Next j :J(sXKr[C Next i GH3#E*t+[ B[xR-6phW 'main loop zd`=Ih2Wx EnableTextPrinting( False ) 5iWe-xQ> &P n] ypos = dety + pixely / 2 IG / $!*E For i = 0 To ny - 1 ~|)
9RUXr> xpos = -detx - pixelx / 2 #Mi|IwL ypos = ypos - pixely EE%s<_k` R^Bk] EnableTextPrinting( True ) MtG_9- Print i V8'`nuC+ EnableTextPrinting( False ) ( D}"&2 7>x;B ~+m,im8} For j = 0 To nx - 1 |R'i:= sA_X<>vAKJ xpos = xpos + pixelx <7gMl Z! YpklZ?~ 'shift source H%Y%fQ~^ LockOperationUpdates srcnode, True m,NMTyJoz GetOperation srcnode, 1, op !s-/0ugZ op.val1 = xpos `)tK^[,<W op.val2 = ypos t&"5dM\ SetOperation srcnode, 1, op >}F? <JB LockOperationUpdates srcnode, False 31 ]7z qWB%),`j> raytrace Bz]J=g7 DeleteRays >0T3'/k<H CreateSource srcnode W#45a.v TraceExisting 'draw MYTS3( U,3d) ]Zy& 'radiometry sfC@*Y2XT For k = 0 To GetEntityCount()-1 d[U1.SNL If IsSurface( k ) Then XZ@>]P temp = AuxDataGetData( k, "temperature" ) s,
-*q} emiss = AuxDataGetData( k, "emissivity" ) )[DpK=[N^p If ( temp <> 0 And emiss <> 0 ) Then \G=bj;&eF ProjSolidAngleByPi = GetSurfIncidentPower( k ) @}G|R\2P frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) n1)'cS5} irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi 0=,'{Vz}A End If kh&_#, m~Me^yt>} End If .jum "va% 4JK@<GBK6 Next k c'lIWuL) vz,LF=s2 Next j v|To+P6b U$EM.ot Next i DJJZJ}7 EnableTextPrinting( True ) g)N54WV n8?KSQy$ 'write out file >%i9 oI<) fullfilepath = CurDir() & "\" & fname eU"mG3__ Open fullfilepath For Output As #1 &"O_wd[+: Print #1, "GRID " & nx & " " & ny n%U9iwJ. Print #1, "1e+308" g$gVm:= Print #1, pixelx & " " & pixely U;>B7X;`E4 Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 5{fwlA 2q|_Dma maxRow = nx - 1 \
>(zunL maxCol = ny - 1 ujNt(7Cz For rowNum = 0 To maxRow ' begin loop over rows (constant X) _3zU,qm+ row = "" 1YFAr}M For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) KY8^BjY@ row = row & irrad(colNum,rowNum) & " " ' append column data to row string Z
c<]^QR Next colNum ' end loop over columns (mY(\mu} eAU"fu6d Print #1, row u-1@~Z %y3:SUOdx Next rowNum ' end loop over rows hF9B?@n?B Close #1 o8mo=V4j |H<|{{E Print "File written: " & fullfilepath `lvh\[3^ Print "All done!!" \cFAxL( End Sub &F86SrsI qY# m*R 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: j@_nI~7f} zAu}hVcW O<Jwaap 找到Tools工具,点击Open plot files in 3D chart并找到该文件 B_b8r7Vn` 8QPT\~ 2kC^7ZAwu 打开后,选择二维平面图: DwT i_8m; ?#U0eb5u
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