| infotek |
2020-11-18 10:58 |
十字元件热成像分析
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。 3T7,Y(<V 380M&Guh
成像示意图 RNB ha& 首先我们建立十字元件命名为Target \>@QJ haW*W=kv) 创建方法: "[t (u/e _6k ej#o8 面1 : B6gn(w3 面型:plane p&|:,|jo5 材料:Air 01/yog 孔径:X=1.5, Y=6,Z=0.075,形状选择Box Nn]|#lLP jdWA)N}kDG
-AcVVK& 辅助数据: `;vJ\$-< 首先在第一行输入temperature :300K, ^a+H`RD emissivity:0.1; 27q=~R} 3}lT"K Q"2J2211 面2 : Oj ?
|g_ 面型:plane a8wQ, 材料:Air ,8^QV3 孔径:X=1.5, Y=6,Z=0.075,形状选择Box W+&<C#1|] />,KWHR|: /3pvq%i 位置坐标:绕Z轴旋转90度, !9ytZR* py8)e7gX=
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] 辅助数据: U3UDA 3+>;$ 首先在第一行输入temperature :300K,emissivity: 0.1; *[SOz) k9Xv@v -0o1iU7 Target 元件距离坐标原点-161mm; >.X& v ]6BV`r]
8+yCP_Y4 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 lk?@ =U~ .lt|$[" 6b6rM%B.oD 探测器参数设定: S7Tc9"oqV Z\9DtvV 在菜单栏中选择Create/Element Primitive /plane Svun
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i@m 元件半径为20mm*20,mm,距离坐标原点200mm。 Y_SB3 $]) (0W)Jd[ 光源创建: 7)Y0D@wg ~As/cd>9 光源类型选择为任意平面,光源半角设定为15度。 lcqpwSk 9ER!K
x $@Gp 我们将光源设定在探测器位置上,具体的原理解释请见本章第二部分。 A`nw(f_/ de<T5/ 我们在位置选项又设定一行的目的是通过脚本自动控制光源在探测器平面不同划分区域内不同位置处追迹光线。 #i1z&b#@ zZ*\v X]T&kdQ6q 功率数值设定为:P=sin2(theta) theta为光源半角15度。我们为什么要这么设定,在第二部分会给出详细的公式推导。 fp`k1Uq@ [42EqVR 创建分析面: 8v V<A*` B65"jy }JlrWJRi 到这里元件参数设定完成,现在我们设定元件的光学属性,在前面我们分别对第一和第二面设定的温度和发射系数,散射属性我们设定为黑朗伯,4%的散射。并分别赋予到面一和面二。 i+&o%nK 2 DbIn3/WNe
L55VS:' 到此,所有的光学结构和属性设定完成,通过光线追迹我们可以查看光线是否可以穿过元件。 (l]_0-Z |K,[[D<R FRED在探测器上穿过多个像素点迭代来创建热图 -D&d1`N4 7~2c"WE FRED具有一个内置的可编译的Basic脚本语言。从Visual Basic脚本语言里,几乎所有用户图形界面(GUI)命令是可用这里的。FRED同样具有自动的客户端和服务器能力,它可以被调用和并调用其他可启动程序,如Excel。因此可以在探测器像素点上定义多个离轴光源,及在FRED Basic脚本语言里的For Next loops语句沿着探测器像素点向上和向下扫描来反向追迹光线,这样可以使用三维图表查看器(Tools/Open plot files in 3D chart)调用和查看数据。 ZtofDp5B 将如下的代码放置在树形文件夹 Embedded Scripts, x3L0;:Fx8P ;T,`m^@zf
N}rc3d# 打开后清空里面的内容,此脚本为通用脚本适用于一切可热成像的应用。 'i5,2vT0 |ycN)zuE 绿色字体为说明文字, _>=QZ`!r jM'(Qa
'#Language "WWB-COM" )r|Pm-:A{ 'script for calculating thermal image map Vu1swq)l 'edited rnp 4 november 2005 iR39lOr UJ^MS4;I3 'declarations 3Q\k!$zq Dim op As T_OPERATION _p^&]eQ+k# Dim trm As T_TRIMVOLUME dc=~EG-_rM Dim irrad(32,32) As Double 'make consistent with sampling 3@8Zy:[8< Dim temp As Double S #6:! Dim emiss As Double 9J4gDw4< Dim fname As String, fullfilepath As String U0fr\kM 4E
32DG* 'Option Explicit dR@XwEpP 8d|#W Sub Main o)r%4YOL 'USER INPUTS trm-&e7q?; nx = 31 D wtvtglqV ny = 31 gWLhO|y numRays = 1000 5JggU minWave = 7 'microns DR
c-L$bD maxWave = 11 'microns A=bBI>GEYP sigma = 5.67e-14 'watts/mm^2/deg k^4 sB+
B,DF fname = "teapotimage.dat" \_|g}&}6Y D9/PVd Print "" gl>%ADOB@ Print "THERMAL IMAGE CALCULATION" 7rSads ''3b[< detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 aYrbB# Kk|4 Print "found detector array at node " & detnode K!jMW lSK<LytB srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 (>M?
iB w6<zPrA Print "found differential detector area at node " & srcnode F|!
ib5 ;!Q}g19C GetTrimVolume detnode, trm vH)V\V detx = trm.xSemiApe \I+#M-V dety = trm.ySemiApe SEXmVFsQ area = 4 * detx * dety /?_5!3K J Print "detector array semiaperture dimensions are " & detx & " by " & dety fZ[uNe[| Print "sampling is " & nx & " by " & ny L7OFZ|gUz 8/BWe
;4 'reset differential detector area dimensions to be consistent with sampling C<yjGtVD pixelx = 2 * detx / nx vHM,_I{ pixely = 2 * dety / ny zya2 O?s SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False wq
=Ef Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 0$:jZ/._ wNQhg 'reset the source power t~kh?u].j SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) W+`T:Mgh Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" ~Hb2-V 7x//4G 'zero out irradiance array Y |'}VU For i = 0 To ny - 1 BVe c For j = 0 To nx - 1 .
l-eJ irrad(i,j) = 0.0 A|
s\5"?? Next j nk.j7tu Next i @s7wKk i>{.Y}; 'main loop i(an]%'v EnableTextPrinting( False ) 2 i97 A?4s+A@Eg ypos = dety + pixely / 2 v18OUPPX For i = 0 To ny - 1 vTq
[Xe" xpos = -detx - pixelx / 2 ?AYb@&% ypos = ypos - pixely 4H_QQ6 yP0XA=,Y EnableTextPrinting( True ) 'h3yxf}\ Print i fp?cb2'7 EnableTextPrinting( False ) A#Ne07d \Y^GA;AMQQ \kEC|O)8 For j = 0 To nx - 1 q:<vl^<j !~fy".|x xpos = xpos + pixelx 0@/C5 v +~\ 1g^h 'shift source k<QZ_*x}G LockOperationUpdates srcnode, True vu|-}v?: GetOperation srcnode, 1, op @BoZZ op.val1 = xpos s4vj op.val2 = ypos M%v 6NxN SetOperation srcnode, 1, op o[B"J96b LockOperationUpdates srcnode, False Rg%Xy`gS a,eJO ?? 'raytrace 5Mz6/&` DeleteRays :@#6]W CreateSource srcnode w"
,ab j TraceExisting 'draw 1HBWOV7z.? Z7J4rTA 'radiometry k\Z@B!VAq For k = 0 To GetEntityCount()-1 +6Ye'IOG If IsSurface( k ) Then gPcOm
b temp = AuxDataGetData( k, "temperature" ) -7(,*1Tk emiss = AuxDataGetData( k, "emissivity" ) mu$rG3M If ( temp <> 0 And emiss <> 0 ) Then X6so)1jJ ProjSolidAngleByPi = GetSurfIncidentPower( k ) Wiere0 2* frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) $/"QYSF irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi ",P?jgs^g5 End If XVzsqi*Z SlI
wLv^ End If `i)Pf WdBN lQ!(lPh Next k O PJ(ub ?yKG\tPhM Next j 5`Y>!|
Ab j026CVL Next i (N?nOOQ EnableTextPrinting( True ) z C7 b /5y _ < 'write out file 9yWSlbPr] fullfilepath = CurDir() & "\" & fname 4P}d/w?'KL Open fullfilepath For Output As #1 b]g#mQ Print #1, "GRID " & nx & " " & ny hQwUwfoe@ Print #1, "1e+308" Q& S 7_ Print #1, pixelx & " " & pixely 8f>v[SQ" Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 jKb4d9aX UL]zuW/ maxRow = nx - 1 Qb8Z+7 maxCol = ny - 1 <z8z\4Hz For rowNum = 0 To maxRow ' begin loop over rows (constant X) cK\'D row = "" R{UZCFZ For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) iHeu<3O row = row & irrad(colNum,rowNum) & " " ' append column data to row string )WsR
8tk Next colNum ' end loop over columns #@m6ag. IAMtMO^L Print #1, row V(;c#%I2 uoTc c|Kc Next rowNum ' end loop over rows C=(~[ Y Close #1 J~)JsAXAI =Y*zF>#lP Print "File written: " & fullfilepath &(h@]F! Print "All done!!" emI F{oP End Sub {Zo*FZcaX >%A~ : 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: *0Wkz'=U $ZlzS`XF7 6W9lKD_i 找到Tools工具,点击Open plot files in 3D chart并找到该文件 ]l^"A~va C:z7R" yj &Z%'xAOGR 打开后,选择二维平面图: 3:bP>l! Ls'8
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