| 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。 "5$p=| 45Zh8 k
成像示意图 ./DlHS; 首先我们建立十字元件命名为Target >}0H5Q8@ #ax% n 创建方法: /18fpH| &{wRB l # 面1 :
\%]lsml 面型:plane N5#j}tT 材料:Air DBu8}2R 孔径:X=1.5, Y=6,Z=0.075,形状选择Box )FA:wsy~E Mw+
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%@aC5^Ovy+ 辅助数据: 'tQp&pj 首先在第一行输入temperature :300K, RZqMpW emissivity:0.1; |_s,]: (VC Jn<@@
H8@z/ 面2 : 8WQc8 面型:plane +#UawYLJ 材料:Air lFA-T I& 孔径:X=1.5, Y=6,Z=0.075,形状选择Box cj2^wmkB 1B 0[dK2N =kOo( 位置坐标:绕Z轴旋转90度, *[jq& PRyzvc~
UT 7'- 辅助数据: e !w{ap8u UpQda`rb 首先在第一行输入temperature :300K,emissivity: 0.1; D#Mz#\4o .
Wd0}?} U:
< Target 元件距离坐标原点-161mm; DbR!s1ux l\m7~
l] 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 #c/K.? j@UE#I|h z-]ND 探测器参数设定: /
U~yYh CNWA!1n^Hy 在菜单栏中选择Create/Element Primitive /plane d?/g5[ xA*6Z)Y
&[PA?#I` 80gOh: 5VVU%STP /;y`6WG%2 元件半径为20mm*20,mm,距离坐标原点200mm。 ~e]l }-Nc}%5 光源创建: 64'sJc. c|iTRco 光源类型选择为任意平面,光源半角设定为15度。 .F _u/"** mgq4g 79jnYjk 我们将光源设定在探测器位置上,具体的原理解释请见本章第二部分。 %bG\ 02:`Joy2D 我们在位置选项又设定一行的目的是通过脚本自动控制光源在探测器平面不同划分区域内不同位置处追迹光线。 ;c@B +RquR bXM&VW?OP T$DFTr\\ 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。 *u[@C e!k4Ij-] 创建分析面: V72?E%d0 ^%U`|GBZp Cs vwc% 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。 >@-BZJg/k (K ]wk9a
gla'urb[i| 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。 @RdNAP_6 VEL!-e^X& FRED在探测器上穿过多个像素点迭代来创建热图 \SJX;7ST U4iVI#f 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。 O^3XhTW^\~ 将如下的代码放置在树形文件夹 Embedded Scripts, -_Z j0=H6Y
.F\[AD 5 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。 m_;XhO F}B2nL& 绿色字体为说明文字, zvv/|z2(r 0yb9R/3. '#Language "WWB-COM" A(+V{1L' 'script for calculating thermal image map W$z^U)|t 'edited rnp 4 november 2005 {3Dm/u%=9| Yqt~h 'declarations ki?V
eFp Dim op As T_OPERATION A#F6~QX(.9 Dim trm As T_TRIMVOLUME BG1hk! Dim irrad(32,32) As Double 'make consistent with sampling 0OtUb:8LX Dim temp As Double )~w
bu2; Dim emiss As Double h6:|RGF Dim fname As String, fullfilepath As String ?uF3Q)rCk {{ 1qkG9$ 'Option Explicit Z3X9-_g +}f}!h; Sub Main #1'p?%K. 'USER INPUTS &mba{O nx = 31 >GDf*
ox[ ny = 31 ~UwqQD1p numRays = 1000 8xoC9!xt minWave = 7 'microns }C
JK9*Z maxWave = 11 'microns pA\"Xe& sigma = 5.67e-14 'watts/mm^2/deg k^4 ABq#I'H#@2 fname = "teapotimage.dat" @[TSJi 8'Q&FW3" Print "" GCxmqoQ Print "THERMAL IMAGE CALCULATION" E8aD[j[w ]-OF3+l4 detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 ^jk-GRD* QC1\Sn / Print "found detector array at node " & detnode 7v`~;}5 UQBc$`v srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 @Fb
2c0?Y K[q-[q#yc Print "found differential detector area at node " & srcnode J(,{ -d-E w6AG:u GetTrimVolume detnode, trm V'l9fj*E detx = trm.xSemiApe byk9"QeY\ dety = trm.ySemiApe AFWWGz area = 4 * detx * dety 87R$Y> V Print "detector array semiaperture dimensions are " & detx & " by " & dety ^W0eRT Print "sampling is " & nx & " by " & ny `pd+as suN}6CI 'reset differential detector area dimensions to be consistent with sampling yM? jiy pixelx = 2 * detx / nx P#,g5 pixely = 2 * dety / ny ]OC?g2&6 SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False Mw6
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Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2
ql_,U8Jw 4B-+DH>{6 'reset the source power CmtDfE SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) R`%O=S*] Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" M"ZeK4qh N1dM,H 'zero out irradiance array ;4*mUD6 For i = 0 To ny - 1 zHXb[$Q For j = 0 To nx - 1 wHs4~"EY9 irrad(i,j) = 0.0 p7,dl*' Next j #ahe@|E'Y Next i v2vtkYQN 6KX/Yj~B 'main loop 8HDI] EnableTextPrinting( False ) i(S}gH4*o q =26($ ypos = dety + pixely / 2 stq%Eg? For i = 0 To ny - 1 ({hW xpos = -detx - pixelx / 2 "X-"uIc ypos = ypos - pixely uh3<%9#\k c,5yH EnableTextPrinting( True ) 1sXVuto Print i P2
z~U EnableTextPrinting( False ) `m-7L W;.LN<bx F2',3 For j = 0 To nx - 1 e Y(JU5{ <1kK@m -E xpos = xpos + pixelx YvFt*t
kp,$ NfD 'shift source #!w7E,UBi LockOperationUpdates srcnode, True
9-Xr GetOperation srcnode, 1, op IGI$,C op.val1 = xpos *YP;HL op.val2 = ypos @E?o~jO(e SetOperation srcnode, 1, op 3:3>k8 LockOperationUpdates srcnode, False #6 M3BF 'I@l$H 'raytrace 3d(:Y6D) DeleteRays xDn#=%~+x CreateSource srcnode R(#ZaFuo[ TraceExisting 'draw 9@ :QBe3] R rp-SR?O 'radiometry rC6{-42bb For k = 0 To GetEntityCount()-1 KH9D}, If IsSurface( k ) Then JQA]O/|N temp = AuxDataGetData( k, "temperature" ) U;FJSy emiss = AuxDataGetData( k, "emissivity" ) WdT iao,r If ( temp <> 0 And emiss <> 0 ) Then .-cx9& ProjSolidAngleByPi = GetSurfIncidentPower( k ) Di&XDW/ frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) KKNQ+'? irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi B5!|L)7>{p End If h&:XO9dY 7~nuFJaTI End If otdm rw| SH6T\}X: Next k /vw$3,*z NoT%z$1n Next j |6b&khAM %G'P!xQhy Next i 1F{,Zr EnableTextPrinting( True ) *+j r? | _''9-t;n, 'write out file 1( rN fullfilepath = CurDir() & "\" & fname 6sNw#pqh Open fullfilepath For Output As #1 T<o8lL Print #1, "GRID " & nx & " " & ny .hK:-q, Print #1, "1e+308" m[Cp
G=32B Print #1, pixelx & " " & pixely !qug^F Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 @$5=4HA [s~6,wz maxRow = nx - 1 af}JS2=$ maxCol = ny - 1 M,oRi;V For rowNum = 0 To maxRow ' begin loop over rows (constant X) g\G}b row = "" #bGYd}BfD For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) #F'8vf'r row = row & irrad(colNum,rowNum) & " " ' append column data to row string Fq'Ds[wd5 Next colNum ' end loop over columns > QG@P q;QE(}.g Print #1, row o8N,mGj} {ukQBu#}< Next rowNum ' end loop over rows #S"s8wdD
Close #1 $ <Mf#.8% wxy@XN"/i+ Print "File written: " & fullfilepath vK$wc~ Print "All done!!" XT1P.
w[aA End Sub
I!T=$Um F12$BKDH 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: }4kQu#0o") '3xK1Am SNSHX2 找到Tools工具,点击Open plot files in 3D chart并找到该文件
pRA%07?W RV%)~S@!R #szIYyk 打开后,选择二维平面图: 8L5O5F' fpJ%{z2
QQ:2987619807 -FW^fGS+
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