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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。 85LAYaw XzEc2)0'v 成像示意图 vwxXgk 首先我们建立十字元件命名为Target ci?qT,& 6;ixa
hZV 创建方法: *=V~YF:Qb qm"rY\: 面1 : <4HDZ{"M 面型:plane f}9zgWU 材料:Air ?j"KV_ 孔径:X=1.5, Y=6,Z=0.075,形状选择Box PoxK{Y ]7Tkkw$ 4b98KsYg 辅助数据: 6">+
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G 首先在第一行输入temperature :300K, xHD=\,{ig emissivity:0.1; )-a'{W/t %H]ptH5 +%ee8|\ 面2 : s~5[![1
K 面型:plane BRgXr 材料:Air wAf\|{Vn 孔径:X=1.5, Y=6,Z=0.075,形状选择Box hoK>~:; _./Sk|C [OC5l> 位置坐标:绕Z轴旋转90度, x|pg"v&[ MkfBuW;) leTf&W 辅助数据: 1H6<[iHW _V7s#_p 首先在第一行输入temperature :300K,emissivity: 0.1; JB<Sl4 X-K=!pET *Q?tl\E Target 元件距离坐标原点-161mm; ;$.J3! _Xk.p_uh Rwz0poG`WG 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 CDQW !XHc f4 P8Oz '
aq!^!z 探测器参数设定: }dgfqq |$8~?7Jv 在菜单栏中选择Create/Element Primitive /plane gG<~-8uQ J^SdH&%Z p<2L.\6" itBwCIj G /Z'L^L%R v+46QK|I& 元件半径为20mm*20,mm,距离坐标原点200mm。 ;z}i-cNae JtYP E? 光源创建: s4A43i'g!h 5m\<U` 光源类型选择为任意平面,光源半角设定为15度。 {< )1q ; HN=V"a ,(d)Qg 我们将光源设定在探测器位置上,具体的原理解释请见本章第二部分。 e:fy#,HEj{ We$:&K0 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。 sFT.Oxg< ZSjMH .Ij" /uPcXq:L~ 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。 :61Tun #5cEV'm; 创建分析面: [$0p+1 :W!7mna I`-8Air5f 到这里元件参数设定完成,现在我们设定元件的光学属性,在前面我们分别对第一和第二面设定的温度和发射系数,散射属性我们设定为黑朗伯,4%的散射。并分别赋予到面一和面二。 O#:$^#j& Q sZx)
bO ^Cu\VV 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。 \KMToN&2 adCU61t FRED在探测器上穿过多个像素点迭代来创建热图 ]R h#g5X gw#5jW\ 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。 Cn'(<bl 将如下的代码放置在树形文件夹 Embedded Scripts, "& ])lz[u .k,1f*% `Nz/Oh7 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。 0
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'#Language "WWB-COM" >80;8\ 'script for calculating thermal image map ii[F]sR\ 'edited rnp 4 november 2005 d"}k!
0m xSktg]u Se 'declarations qaiNz S@q Dim op As T_OPERATION Isvx7$Vu+ Dim trm As T_TRIMVOLUME 7mI:|G Dim irrad(32,32) As Double 'make consistent with sampling LPZF)@|` Dim temp As Double EN$2,qf Dim emiss As Double M2PAy! J Dim fname As String, fullfilepath As String F"&~*m^+ q$I;dOCJ, 'Option Explicit QQ%D8$k" ]$ L| Sub Main f!\lg 'USER INPUTS }YB*]<] nx = 31 {@eJtF+2 ny = 31 {IxA)v-` numRays = 1000 .z]Wyx&/U minWave = 7 'microns g[1gF& maxWave = 11 'microns S|SV$_
( sigma = 5.67e-14 'watts/mm^2/deg k^4 %-)H^i~]% fname = "teapotimage.dat" SX<` {x&L 'qZW,],5 Print "" &~8oQC-eF Print "THERMAL IMAGE CALCULATION" *,e:]!* cc,^6[OH@ detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 s3~lT. ;XF:\<+ Print "found detector array at node " & detnode sPr~=,F GR&z, srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 't1ax^-g JSkLEa~< Print "found differential detector area at node " & srcnode Bzkoo J ;T"zV{;7BR GetTrimVolume detnode, trm ?{/4b:ua detx = trm.xSemiApe SQ44 dety = trm.ySemiApe Lx\8Z= area = 4 * detx * dety _2hS";K Print "detector array semiaperture dimensions are " & detx & " by " & dety [<2<Y Print "sampling is " & nx & " by " & ny s%qF/70' !Y$h"<M 'reset differential detector area dimensions to be consistent with sampling fmQ_P.c pixelx = 2 * detx / nx q1z"-~i)E pixely = 2 * dety / ny ZIf SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False D ~stM Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 ;|pBFKx Y'1S`. 'reset the source power kw#;w=\>R{ SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) Wl B Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" 695V3R 7 [0(B>a3J 'zero out irradiance array +
,%&e For i = 0 To ny - 1 !ipR$ dM For j = 0 To nx - 1 Xnz3p" irrad(i,j) = 0.0 JG" R\2 Next j [h^2Y&Au5 Next i )[PtaPWeT 4[.oPK=i 'main loop <D:.(AUeO EnableTextPrinting( False ) fI{E SXU TOkp%@9/ ypos = dety + pixely / 2 ZX>AE3wk For i = 0 To ny - 1 }@;ep&b* xpos = -detx - pixelx / 2 7Nk!1s: ypos = ypos - pixely u -;_y='m Q~OxH'>>( EnableTextPrinting( True ) Jbjmv:db Print i Yn@lr6s EnableTextPrinting( False ) n2]/v{E;/ o<[#0T^K qu-B|
MuOa For j = 0 To nx - 1 XWUWY M@`;JjtSA xpos = xpos + pixelx Of" H7d/X 'shift source 8dO! LockOperationUpdates srcnode, True gLE:g5v6 GetOperation srcnode, 1, op Jll-`b 1 op.val1 = xpos rf?qdd(~cH op.val2 = ypos 7[> 6i SetOperation srcnode, 1, op Km(n7Ah" LockOperationUpdates srcnode, False U&Wt%U{ AfX}y+Ah raytrace jF0jkj1&/[ DeleteRays i(AT8Bo2 CreateSource srcnode L\@I*QP TraceExisting 'draw eM$s v9? cl]Mi
"3_ 'radiometry W8ouO+wK For k = 0 To GetEntityCount()-1 W+PJZn If IsSurface( k ) Then U^Q:Y}^ temp = AuxDataGetData( k, "temperature" ) l|/ep:x8 emiss = AuxDataGetData( k, "emissivity" ) _CmOd-y If ( temp <> 0 And emiss <> 0 ) Then 2nSSFx r ProjSolidAngleByPi = GetSurfIncidentPower( k ) ^lA=* jY( frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) g]4(g<:O
irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi }% `.h" End If *:Vq:IU[D cki81bOT End If PcA2/!a ^Pbk#|$rU Next k `8AR_7i X$ s:>[H Next j @6wFst\t do*EKo Next i ;$smH=I EnableTextPrinting( True ) ^>i63Yc r [4tPk 'write out file X~lVVBO fullfilepath = CurDir() & "\" & fname `%+Wz0(K Open fullfilepath For Output As #1 8,C*4y~ Print #1, "GRID " & nx & " " & ny Lv|q Print #1, "1e+308" ,1 [q^-9 Print #1, pixelx & " " & pixely $,,op( Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 3BtaH#ZY {ys=Ndo8 maxRow = nx - 1 lfqiyYFm maxCol = ny - 1 d-k%{eBV For rowNum = 0 To maxRow ' begin loop over rows (constant X) 555XCWyrC row = "" ]ooIrY8 For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) qU#1i:(F* row = row & irrad(colNum,rowNum) & " " ' append column data to row string 1JztFix Next colNum ' end loop over columns [co% :xJu U56G. Print #1, row yXHUJgjl/ Dey<OE& Next rowNum ' end loop over rows (oEC6F Close #1 m 8aITd8 2QJ{a46} Print "File written: " & fullfilepath v":x4!kdX Print "All done!!" 9s6U}a'c End Sub <Bw^!.jAF 3E!|<q$z 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: "nw;NIp! C-\S/yd K`u(/kz/< 找到Tools工具,点击Open plot files in 3D chart并找到该文件
ll`>FcQ D/vOs[X
o, |wH5sjT 打开后,选择二维平面图: 59"UL\3 ^/\Of{OZ-
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