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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。 ^|/TC!v]M %>yG+Od5Z 成像示意图 _>5(iDW0 首先我们建立十字元件命名为Target wrc,b{{[iM VF&(8X\ 创建方法: /sUYU(3 h:W;^\J:- 面1 : 9Z|jxy 面型:plane s(5Y 材料:Air hcgMZT!<5 孔径:X=1.5, Y=6,Z=0.075,形状选择Box O@tU.5*$5 aI%g2q0f zvvhFN2s 辅助数据: q['Euy 首先在第一行输入temperature :300K, ot,jp|N>f~ emissivity:0.1; mi=Q{>rb /'Ass(=6 q]\:P.x!> 面2 : i@C].X 面型:plane .!Qki@ 材料:Air p09HL%~R 孔径:X=1.5, Y=6,Z=0.075,形状选择Box z#zI1Am(O bZ?v-fn\D, A^nvp!_ 位置坐标:绕Z轴旋转90度, Y#]+Tm(+ !Xh=k36 ]jtK I4 辅助数据: Y4OPEo 5o qt"G[9; 首先在第一行输入temperature :300K,emissivity: 0.1; NiNM{[3oS
Hu^1[# T%x}Y#U'` Target 元件距离坐标原点-161mm; zE336 :I"2V Z EXc%-M 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 Um} ob+b<HFv bH-ub2@qO 探测器参数设定: +s"hqm [8.c8-lZ^ 在菜单栏中选择Create/Element Primitive /plane 6}Vf\j~ kj|6iG IrR7"`.i *]. 7dec/ 4ae`pAu ,oORW/0iS 元件半径为20mm*20,mm,距离坐标原点200mm。 Z_PNI#h* CHdX;'`* 光源创建: 8&;UO{ Eou~P h*t 光源类型选择为任意平面,光源半角设定为15度。 \(~y? l f"B3,6m \K_ET> ! 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。 WKQ^NEqr3 !5wIIS:FT 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。 1;d$#j B5gj_^ jAGTD I 功率数值设定为:P=sin2(theta) theta为光源半角15度。我们为什么要这么设定,在第二部分会给出详细的公式推导。 UN7EF/!Zz fr,7rS/w{l 创建分析面: "MxnFeLM# yTyj'-4 BoA/6FRi[ 到这里元件参数设定完成,现在我们设定元件的光学属性,在前面我们分别对第一和第二面设定的温度和发射系数,散射属性我们设定为黑朗伯,4%的散射。并分别赋予到面一和面二。 NnO~dRx{ G=)i{oC {.n"Z 到此,所有的光学结构和属性设定完成,通过光线追迹我们可以查看光线是否可以穿过元件。 Bm.afsM; Q.bXM?V) FRED在探测器上穿过多个像素点迭代来创建热图 a! (4Ch sJ\BF FRED具有一个内置的可编译的Basic脚本语言。从Visual Basic脚本语言里,几乎所有用户图形界面(GUI)命令是可用这里的。FRED同样具有自动的客户端和服务器能力,它可以被调用和并调用其他可启动程序,如Excel。因此可以在探测器像素点上定义多个离轴光源,及在FRED Basic脚本语言里的For Next loops语句沿着探测器像素点向上和向下扫描来反向追迹光线,这样可以使用三维图表查看器(Tools/Open plot files in 3D chart)调用和查看数据。 <3(LWxw 将如下的代码放置在树形文件夹 Embedded Scripts, +_7*iJtD5 C#QpQg2 XoXM^*Vk 打开后清空里面的内容,此脚本为通用脚本适用于一切可热成像的应用。 TH)"wNa D,m]CK' 绿色字体为说明文字, d; [C6d zh4#A
<e '#Language "WWB-COM" D>|H 2 'script for calculating thermal image map |HU@
> 'edited rnp 4 november 2005 J`^ag' =Xm@YVf&ZD 'declarations liEPCWl& Dim op As T_OPERATION U6=..K!q Dim trm As T_TRIMVOLUME `id9j Dim irrad(32,32) As Double 'make consistent with sampling 01[NX? qEa Dim temp As Double ,"2s` YC Dim emiss As Double >AC]#' Dim fname As String, fullfilepath As String BW-`t-,E; /{|EAd{ 'Option Explicit UsgK })uGRvz Sub Main |b[+I?X 'USER INPUTS ;sfb 4x4 nx = 31 >O1[:%Z1 ny = 31 +
r!1<AAE$ numRays = 1000 Kfm5i Q minWave = 7 'microns @HT% n maxWave = 11 'microns 0WT{,/> sigma = 5.67e-14 'watts/mm^2/deg k^4 -7m:91x fname = "teapotimage.dat" "b?v?V0%C [N1hWcfvd Print "" mt9.x Print "THERMAL IMAGE CALCULATION" m_hN*v
Py l;af~ef)' detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 _,q) hOI t
c[n&X Print "found detector array at node " & detnode r`%+M7 cbeLu'DWB. srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 wNq;;AJ$ nv)2!mAh\ Print "found differential detector area at node " & srcnode "mX\&%i6\p *Kyw^DI GetTrimVolume detnode, trm Rfn9s(m detx = trm.xSemiApe 6W@UJx}w5 dety = trm.ySemiApe & +4gSr area = 4 * detx * dety ^?$WVB Print "detector array semiaperture dimensions are " & detx & " by " & dety `IOs-%s Print "sampling is " & nx & " by " & ny lW<PoT -DxL 0:E 'reset differential detector area dimensions to be consistent with sampling qs|mj}? pixelx = 2 * detx / nx [qdRUV' pixely = 2 * dety / ny Q#^Qv.s?K SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False Mmj;'iYOwF Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 w0|gG+x jS jxiC
Kx,G 'reset the source power np%\&CVhN SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) <Gav5Rc Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" y[>;]R7' 9k9_mjLZ 'zero out irradiance array =81@o,1w For i = 0 To ny - 1 9 Yx]=n For j = 0 To nx - 1 !(qsD+ irrad(i,j) = 0.0 CL)lq)1( Next j u4.ngjJ Next i h\7fp. f}Np/ 'main loop 76>7=#m0u' EnableTextPrinting( False ) 1J6,]M xO1[>W ypos = dety + pixely / 2 J~B<7O<?!1 For i = 0 To ny - 1 {*[\'!d--. xpos = -detx - pixelx / 2 y'(Ne=y ypos = ypos - pixely Gq_-Val]" ]E_h EnableTextPrinting( True ) S5KEXnjm Print i n"+[ :w4 EnableTextPrinting( False ) |?Frj ak->ML UJ0<%^f For j = 0 To nx - 1 -6Oz^
ikSF)r;*t xpos = xpos + pixelx $"dR
SysB !l|5z G
'shift source z ^_*& LockOperationUpdates srcnode, True 5~Cakd]> GetOperation srcnode, 1, op 61/.K_%I. op.val1 = xpos xfy1pS.[: op.val2 = ypos i:rFQ8I SetOperation srcnode, 1, op CqHK %M LockOperationUpdates srcnode, False lrWV#`6!+ 8~9030>Q raytrace af#pR&4} DeleteRays &ZghMq~ CreateSource srcnode "VkTY|a TraceExisting 'draw KBXK0zWh7 2H/Z_+\ 'radiometry y_*PQZ$c< For k = 0 To GetEntityCount()-1 zUkN 0 If IsSurface( k ) Then !>BZ6gn5 temp = AuxDataGetData( k, "temperature" ) t<T[h2Wd emiss = AuxDataGetData( k, "emissivity" ) U7!.,kR- If ( temp <> 0 And emiss <> 0 ) Then S!Omy:=;i ProjSolidAngleByPi = GetSurfIncidentPower( k ) 2-=\~<) frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) hX`hs-*qM irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi CM<]ZG7 End If $&$w Y/F i<H wTmm$ End If |+35y_i6 0dA7pY9 Next k &;XAuDw4+i OkCQ?] Next j hty0Rb[dH >*-FV{{ Next i >N;F8v EnableTextPrinting( True ) oq4}3bQ [q_`X~3 'write out file U\veOQ;mW fullfilepath = CurDir() & "\" & fname J4"mK1N( Open fullfilepath For Output As #1 )I^2k4Cg" Print #1, "GRID " & nx & " " & ny is1' s[ Print #1, "1e+308" !/^-;o7 Print #1, pixelx & " " & pixely e'*`.^ Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 'mH )d i^_#%L maxRow = nx - 1 :l2g# * c maxCol = ny - 1 "p/j; 6H For rowNum = 0 To maxRow ' begin loop over rows (constant X) 2$14q$eb row = "" #l4)HV For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) HQUeWCN row = row & irrad(colNum,rowNum) & " " ' append column data to row string 2:BF[c` Next colNum ' end loop over columns Q\GDrdA /0W9g Print #1, row =/u%c! Rx*BwZ Next rowNum ' end loop over rows I=7Y]w= Close #1 @WQK>-=(3 [6)UhS8 Print "File written: " & fullfilepath ly4s"4v Print "All done!!" d{3@h+zL End Sub 'Q
=7/dY3I }<>~sy 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: /^$UhX9v BnCKSg7V R64!>o"nED 找到Tools工具,点击Open plot files in 3D chart并找到该文件 Ul_M3"Z ?9HhG?_x Qd_Y\PzS 打开后,选择二维平面图: gP-nluq YXU|h
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