| infotek |
2022-01-24 09:30 |
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。 d-$/C| J m[?gN&%nc
成像示意图 >z69r0)> 首先我们建立十字元件命名为Target 8>V)SAI' O8w|!$Q. 创建方法: Z|$OPMLX Jg%jmI;Y 面1 : Q>>II|~;J 面型:plane VH$hQPP5d 材料:Air A{QA0X!p 孔径:X=1.5, Y=6,Z=0.075,形状选择Box 1mz72K mA']*)L1
.
,n>#lL 辅助数据: 6
VuMx7W1 首先在第一行输入temperature :300K, co%-d emissivity:0.1; [>U =P` CN<EgNt1kN AtW<e;!0te 面2 : xsdi\
j;n> 面型:plane \#)w$O 材料:Air A"~4|`W 孔径:X=1.5, Y=6,Z=0.075,形状选择Box a/H|/CB3 JQ]A"xTIa* &>%9JXU 位置坐标:绕Z轴旋转90度, O0,=@nw8. q <Zza
;B!u=_' 辅助数据: Omy<Y@$ *.F4?i2D 首先在第一行输入temperature :300K,emissivity: 0.1; *b+~@o a EmLf #=\ nuT'oy Target 元件距离坐标原点-161mm; $:SSm$k 2io~pk>
%6@->c{ 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 B`<K]ut K/ 5U;oC hTVA^j(w 探测器参数设定: s+OXT4>+ R\d)kcy4 在菜单栏中选择Create/Element Primitive /plane <mX EX`? rGb<7b%
mJ L=H -{rUE + MGE8S$Z _/`H<@B_U 元件半径为20mm*20,mm,距离坐标原点200mm。 E|v9khN(]. {<1 ]cP 光源创建: "8sB,$ DZE@C^0% 光源类型选择为任意平面,光源半角设定为15度。 <P1yA>=3` 7F @#6 ]XhX aoqL 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。 K#!c<Li# {f:%+h 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。 N(=Z4Nk5 J_rb3 0S71&I$u] 功率数值设定为:P=sin2(theta) theta为光源半角15度。我们为什么要这么设定,在第二部分会给出详细的公式推导。 ~duF2m 72 4(D/~OG-6 创建分析面: KO3X)D<3 NY3.?@Z {7Q)2NC 到这里元件参数设定完成,现在我们设定元件的光学属性,在前面我们分别对第一和第二面设定的温度和发射系数,散射属性我们设定为黑朗伯,4%的散射。并分别赋予到面一和面二。 e-Ma8+X\ ]L{diD2G
yeqHeZ 到此,所有的光学结构和属性设定完成,通过光线追迹我们可以查看光线是否可以穿过元件。 ,,HoD~]rd OH/!Ky\@ FRED在探测器上穿过多个像素点迭代来创建热图 S";c7s 7w51UmO FRED具有一个内置的可编译的Basic脚本语言。从Visual Basic脚本语言里,几乎所有用户图形界面(GUI)命令是可用这里的。FRED同样具有自动的客户端和服务器能力,它可以被调用和并调用其他可启动程序,如Excel。因此可以在探测器像素点上定义多个离轴光源,及在FRED Basic脚本语言里的For Next loops语句沿着探测器像素点向上和向下扫描来反向追迹光线,这样可以使用三维图表查看器(Tools/Open plot files in 3D chart)调用和查看数据。 Bx9v2x. 将如下的代码放置在树形文件夹 Embedded Scripts, iV2v<ap.n !@3"vd{^
v1}9i3Or# 打开后清空里面的内容,此脚本为通用脚本适用于一切可热成像的应用。 -"uOh,G} <`'T#e$ 绿色字体为说明文字, ve f9*u` z,xGjSP '#Language "WWB-COM" hh7unHt- 'script for calculating thermal image map ( we)0AxF' 'edited rnp 4 november 2005 k$3Iv"gbx SQs+4YJ 'declarations qN\?cW' Dim op As T_OPERATION <\`qRz0/ Dim trm As T_TRIMVOLUME Aa4 DJ Dim irrad(32,32) As Double 'make consistent with sampling CWY-}M Dim temp As Double yIYQ.-DkS+ Dim emiss As Double ,xI
FF-[0 Dim fname As String, fullfilepath As String @id!F<+%oD ex6QHUQ 'Option Explicit u5N&W n{ #Oi{7~ Sub Main D=@bP B> 'USER INPUTS OEnCN nx = 31 /(8"9Sfm ny = 31 W$xW9u8@+( numRays = 1000 _lrvK99 minWave = 7 'microns U%)-_
*`z maxWave = 11 'microns {H3B1*Dk sigma = 5.67e-14 'watts/mm^2/deg k^4 kX%vTl7F fname = "teapotimage.dat" Qo\?(EM j:E3c\a Print "" L@"&s#~=3 Print "THERMAL IMAGE CALCULATION"
*I.eCMDa Q6;bORN detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 LK+67Y{25 |eI!wgQx Print "found detector array at node " & detnode sB8v: XaF;IS@A srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 B$ jX%e{:S 3b[.s9Q Print "found differential detector area at node " & srcnode X`28? *$Y_ %} GetTrimVolume detnode, trm <w3_EO detx = trm.xSemiApe |j=Pj)5J dety = trm.ySemiApe kMZo7 y area = 4 * detx * dety ~S\, Print "detector array semiaperture dimensions are " & detx & " by " & dety %7[q%S Print "sampling is " & nx & " by " & ny -"rANP-UI Irui{%T 'reset differential detector area dimensions to be consistent with sampling |$g} &P8; pixelx = 2 * detx / nx f2u4*X
E\ pixely = 2 * dety / ny sQ.t3a3m SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False P*n/qj8h Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 t;`ULp~& ZCuo YE$g 'reset the source power ;3XOk+ SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) i.{.koH< Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" PD~vq^@Q \5}*;O@ 'zero out irradiance array _nM 7SK For i = 0 To ny - 1 9_O6Sl For j = 0 To nx - 1 ~OWpk)Vq irrad(i,j) = 0.0 md `=2l Next j f@2F! Next i +j %y#_~ qh+&Z x~ 'main loop nk;^sq4M: EnableTextPrinting( False ) ;iW>i8 9N<=,!;5~s ypos = dety + pixely / 2 "'C5B>qO For i = 0 To ny - 1 eD8e0
D'S xpos = -detx - pixelx / 2 axOEL:-|Bu ypos = ypos - pixely
XRHngW_A f!H/X%F EnableTextPrinting( True ) xIwILY|W= Print i KcUR
/o5K EnableTextPrinting( False ) virt[5w vqZBDQ0 dL_9/f4 For j = 0 To nx - 1 6AoKuT; 'j-U=2,n xpos = xpos + pixelx 4)8e0L*[B? ?C- ju8]| 'shift source 0Y:)$h2? LockOperationUpdates srcnode, True $f%om) GetOperation srcnode, 1, op E]}_hZU op.val1 = xpos r`\@Fv, op.val2 = ypos |>OBpb SetOperation srcnode, 1, op A!Tm[oqu LockOperationUpdates srcnode, False Q7-iy UB+7]S raytrace jz]}%O DeleteRays "
%qr*| CreateSource srcnode B]vR=F}* TraceExisting 'draw #d06wYz= ]s!id[j 'radiometry )+DDIq For k = 0 To GetEntityCount()-1 97qf3^gGd If IsSurface( k ) Then ?rA3<j temp = AuxDataGetData( k, "temperature" ) JPHM+3v emiss = AuxDataGetData( k, "emissivity" ) UNK.39 If ( temp <> 0 And emiss <> 0 ) Then 7XLqP ProjSolidAngleByPi = GetSurfIncidentPower( k ) )0DgFA6k_ frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) SUv'cld irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi O#t[YP End If Xk/iyp/ Zw _aeJ End If q]?)c 3fA+{Y8S Next k 1)jeawVmj _RUL$Ds Next j =@S
a\; JWYe~ Next i :U *8S\$ EnableTextPrinting( True ) 6yO5{._M tv`b## 'write out file 4w#2m>. fullfilepath = CurDir() & "\" & fname 5gII|8>rQ Open fullfilepath For Output As #1 "}#%h&, Print #1, "GRID " & nx & " " & ny wy8Q=X:vP Print #1, "1e+308" ;obOr~Jx'5 Print #1, pixelx & " " & pixely /qMnIo
Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 Tl'wA^~H B- $?5Ft! maxRow = nx - 1 /!^,+ maxCol = ny - 1 !h|,wq]k For rowNum = 0 To maxRow ' begin loop over rows (constant X) ^)I}# row = "" UCK;?] For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) @x!,iT row = row & irrad(colNum,rowNum) & " " ' append column data to row string 2K{'F1"RM Next colNum ' end loop over columns 1G.?Y3DC< ~\i(bFd) Print #1, row 7(uz*~Z?`0 k52IvB@2 Next rowNum ' end loop over rows %p$XK(6 Close #1 WJu(,zM?G [3s-S+n
@ Print "File written: " & fullfilepath <7SE| Print "All done!!" K;WQV, End Sub $5.52 h# KSKKNW 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: c61OT@dZEA hczDu8 AIY 1sSK 找到Tools工具,点击Open plot files in 3D chart并找到该文件 :Yn.Wv- U,Uy0s2r >
Xh=P% 打开后,选择二维平面图: :"Otsb7 qg=`=]j
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