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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。 +csi[c)3E qO|R^De 成像示意图 73\JwOn~ 首先我们建立十字元件命名为Target FFEfI4&SfS Ob<{G" 创建方法: io8'g3< q}?4f*WC 面1 : gK'1ZLdZ2 面型:plane Rw0qcM\>| 材料:Air WL"^>[Vq 孔径:X=1.5, Y=6,Z=0.075,形状选择Box VG
;kPzze aq@8"b(. tu66'z 辅助数据: B e0ND2oo 首先在第一行输入temperature :300K, YF>m$?; emissivity:0.1; 2HsLc*9{4 M# %a(Y3K) 85Otss/mM 面2 : {C N~S*m 面型:plane 7Bd-!$j+ 材料:Air [rV>57`YD 孔径:X=1.5, Y=6,Z=0.075,形状选择Box waj0"u^# f@|A[>"V Zm_UR*" 位置坐标:绕Z轴旋转90度, +Z!)^j cmU1!2.1E 7 *`h/ 辅助数据: =*c7i]@} (<xfCH
F5 首先在第一行输入temperature :300K,emissivity: 0.1; kr9*,E9cv f\sQO& 9\BT0kx Target 元件距离坐标原点-161mm; D!Pq4'd( )9"_J9G AW!?"xdZ 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 MS
81sN\d 2Ay*kmW m4hg'<<V 探测器参数设定: /)}q Xx& E%,^Yvh/ 在菜单栏中选择Create/Element Primitive /plane &-Gqdnc xg;+<iW o.!~8mD f=r<nb'H %Q
fO8P Y4`}y-'d 元件半径为20mm*20,mm,距离坐标原点200mm。 YA_c
N5p/@ koZ*+VP= 光源创建: <oT^ A|JFj 1AM!8VR2 光源类型选择为任意平面,光源半角设定为15度。 !h23cj+V Gi?/C&1T K<SyC54 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。 ,*&:2o_r (3Two} 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。 |@
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0Q2 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。 -w}]fb2Q> 8hOk{xs8 创建分析面: wnEyl[ac r%yvOF\> ?mFv0_!O 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。 '
V^6XI jET{Le8i 5HkKurab 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。 (_mnB W 8*#R]9 FRED在探测器上穿过多个像素点迭代来创建热图 F;4vPbH+ Zw5Ni Xj 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。 Sq/
qu-%X 将如下的代码放置在树形文件夹 Embedded Scripts, VM
GS[qrG 0WZ_7C? fk6%XO 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。 cl[BF'.H "GMBjT8 绿色字体为说明文字, =.f-w0V 5cL83FQh '#Language "WWB-COM" |:q=T
~x 'script for calculating thermal image map e6R}0w~G 'edited rnp 4 november 2005 (C-{B[Y )t0$qd ] 'declarations o{* e'4 Dim op As T_OPERATION BP'36?=Zo Dim trm As T_TRIMVOLUME 5[k/s}g Dim irrad(32,32) As Double 'make consistent with sampling W=^#v Dim temp As Double #>b3"[ | Dim emiss As Double ov`h Dim fname As String, fullfilepath As String ]HKQDc' WejYy| 'Option Explicit m4hX 'F [')m|u~FS4 Sub Main jSh5!6O 'USER INPUTS 8Wrh]egu1 nx = 31 L[oui,}_ ny = 31 &gVN& numRays = 1000 .zA^)qgL minWave = 7 'microns sT 3^hY7 maxWave = 11 'microns zT=Ho
sigma = 5.67e-14 'watts/mm^2/deg k^4 b#uL?f fname = "teapotimage.dat" PWaw]*dFmy f2Klt6"9 Print "" aktU$Wbwl Print "THERMAL IMAGE CALCULATION" NPhhD&W_ rn/ /% detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 B6u/mo<
?]|\4]zV Print "found detector array at node " & detnode ocqU=^ta \f]k CB srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 x5,++7Tz mq aHwID Print "found differential detector area at node " & srcnode oX#Q<2z* 3 R=,1< GetTrimVolume detnode, trm &oP+$;Y detx = trm.xSemiApe nOt&pq7 dety = trm.ySemiApe oRm L
{UDZ area = 4 * detx * dety KSbKEA Print "detector array semiaperture dimensions are " & detx & " by " & dety *]ly0nP Print "sampling is " & nx & " by " & ny YZL kL26[ B -?6M6# 'reset differential detector area dimensions to be consistent with sampling "Q}#^h]F pixelx = 2 * detx / nx 1t:Q_j0Ym pixely = 2 * dety / ny 0IwA#[m1` SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False (yu/l6[ Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 e}D3d=6` Buf/@B7+\ 'reset the source power ;X8yFq SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) <6EeD5{* Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" PXK7b2fE. +DW~BS3 'zero out irradiance array fV &KM*W*@ For i = 0 To ny - 1 %}SGl${- For j = 0 To nx - 1 3AHlSX irrad(i,j) = 0.0 l Q'I Next j 6bomh2 Next i v0
nj M X\`_3= 'main loop >QjAoDVX? EnableTextPrinting( False ) w,.+IV$Kk sT !~J4 ypos = dety + pixely / 2 =!kk|_0%E For i = 0 To ny - 1 <L mIK xpos = -detx - pixelx / 2 sNj)ZWgd> ypos = ypos - pixely @KWb+?_H{< q4R5<LW" EnableTextPrinting( True ) HTVuStM8 Print i UR%/MV EnableTextPrinting( False ) !9u|fnC9 GQ t8p[! Vu)4dD! For j = 0 To nx - 1 YNLV9.P6 %j:]^vqFA xpos = xpos + pixelx J@^8ko f1`gdQ)H 'shift source 'z0:Ccbj LockOperationUpdates srcnode, True 8J=?5 GetOperation srcnode, 1, op "8c@sHk(w op.val1 = xpos $&y%=-] | op.val2 = ypos )2pbpbWX> SetOperation srcnode, 1, op ql<i] Y LockOperationUpdates srcnode, False }O/U;4Z 9)y/:sO<P raytrace
>7wOoK|1' DeleteRays #Vl 0.l3 CreateSource srcnode NhfJ30~ TraceExisting 'draw @E^~$-J5j 8}c$XmCM 'radiometry O}tZ - 'T For k = 0 To GetEntityCount()-1 J{l1nHQZSu If IsSurface( k ) Then 8I-u2Y$Sr temp = AuxDataGetData( k, "temperature" ) _p#CwExuy emiss = AuxDataGetData( k, "emissivity" ) *v;!-F&8> If ( temp <> 0 And emiss <> 0 ) Then ST2.:v;lb ProjSolidAngleByPi = GetSurfIncidentPower( k ) C+?Hm1 frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) ^@I irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi ~Fe${2 End If m#8m] Y :}yi-/_8! End If *meZ8DV2DH `k=bL"T>\ Next k K\>tA)IPSV N/]o4o Next j q`|LRz&al *YW/_ Next i r>dwDBE EnableTextPrinting( True ) &J55P]7w ZtV9&rd7 'write out file 2Gz}T _e fullfilepath = CurDir() & "\" & fname :@kGAI Open fullfilepath For Output As #1 6,"IDH|ND Print #1, "GRID " & nx & " " & ny e`@ # *}A Print #1, "1e+308" d{rQzia"mV Print #1, pixelx & " " & pixely guX
9} Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 @xQgY*f# LG-y]4a} maxRow = nx - 1 QBtnx[ maxCol = ny - 1 3Dg,GaRk For rowNum = 0 To maxRow ' begin loop over rows (constant X) ZZWD8AX row = "" 0T@ Zb={ For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) ]P#XVDn+; row = row & irrad(colNum,rowNum) & " " ' append column data to row string xgABpikC^ Next colNum ' end loop over columns ,^?^dB @L>q(Kg Print #1, row 3Th'p aMG -c(F 1l Next rowNum ' end loop over rows 2uG0/7 Close #1 ?bPRxR $>*3/H Print "File written: " & fullfilepath (>F%UY Print "All done!!" f_[<L End Sub >QA uEM Ol1e/Wv 在输出报告中,我们会看到脚本对光源的孔径和功率做了修改,并最终经过31次迭代,将所有的热成像数据以dat的格式放置于: 7P"| J\ >GQEqXs ">~.$Jp_4 找到Tools工具,点击Open plot files in 3D chart并找到该文件 >G);j@Q W;_nK4$%' SPN5dE.@ 打开后,选择二维平面图: aT_&x@x -9"['-WH,
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