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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。 {GQ^fu;q T\D}kQM 成像示意图 U
H*r5o3 首先我们建立十字元件命名为Target 2.l:O2< @0/+_2MH- 创建方法: )r
jiY%F$ _no*k?o* 面1 : ^zQ/mo,Z 面型:plane oC0qG[yp9S 材料:Air *2,VyY 孔径:X=1.5, Y=6,Z=0.075,形状选择Box =w{Z@S(ukz #T'{ n1AI E&[{4Ml 辅助数据: )8$=C#qC[ 首先在第一行输入temperature :300K, pe1R(|H emissivity:0.1; @X#F3; 9-fLz?J ZZzMO6US0 面2 : .nx2";oi 面型:plane
2*^j 材料:Air {+Rog/;S' 孔径:X=1.5, Y=6,Z=0.075,形状选择Box |l]XpWV [J?aD`{#O +[\FD; > 位置坐标:绕Z轴旋转90度, @emK1iwm ;'#8tGv= Ju1D
=b 辅助数据: 4\8+9b\9" $#9;)8J 首先在第一行输入temperature :300K,emissivity: 0.1; 3 cK I d,B:kE0Y z`f($t[ Target 元件距离坐标原点-161mm; #_^Lb]jkM Ac2n l3ko?k 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 ix)M`F%P3 $QLcH;+7t Ch<[l8;K 探测器参数设定: Qp_isU b*c*r dTx 在菜单栏中选择Create/Element Primitive /plane #P0&ewy Krqtf +0nJ Y5- F@( :VRNs JfLqtXF[&" 元件半径为20mm*20,mm,距离坐标原点200mm。 0" mwHB(7YS, 光源创建: jaII r06 PNgY>=Y 光源类型选择为任意平面,光源半角设定为15度。 K*LlW@ :LF? -*X a3/kQ 我们将光源设定在探测器位置上,具体的原理解释请见本章第二部分。 ]hk g?goZPZB 我们在位置选项又设定一行的目的是通过脚本自动控制光源在探测器平面不同划分区域内不同位置处追迹光线。 5Ha9lM2gh RzE_K'M vWzm@ 功率数值设定为:P=sin2(theta) theta为光源半角15度。我们为什么要这么设定,在第二部分会给出详细的公式推导。 G|!Tj X7s fg_4zUGM+g 创建分析面: CkOz M ?Y;a5{ N} G[7Rp8l 到这里元件参数设定完成,现在我们设定元件的光学属性,在前面我们分别对第一和第二面设定的温度和发射系数,散射属性我们设定为黑朗伯,4%的散射。并分别赋予到面一和面二。 zy/@
WFPE pjKWtY@=X gc_:%ki 到此,所有的光学结构和属性设定完成,通过光线追迹我们可以查看光线是否可以穿过元件。 Rr&h!YMb UZ\u;/} FRED在探测器上穿过多个像素点迭代来创建热图 |W,&
Hl7 e^6)Zz1\ FRED具有一个内置的可编译的Basic脚本语言。从Visual Basic脚本语言里,几乎所有用户图形界面(GUI)命令是可用这里的。FRED同样具有自动的客户端和服务器能力,它可以被调用和并调用其他可启动程序,如Excel。因此可以在探测器像素点上定义多个离轴光源,及在FRED Basic脚本语言里的For Next loops语句沿着探测器像素点向上和向下扫描来反向追迹光线,这样可以使用三维图表查看器(Tools/Open plot files in 3D chart)调用和查看数据。 P{kur} T 将如下的代码放置在树形文件夹 Embedded Scripts, LG{,c.Qj* tqE6>"jD _{I3i:f9X8 打开后清空里面的内容,此脚本为通用脚本适用于一切可热成像的应用。 3%#3iZ=_ D=j-!{zB 绿色字体为说明文字, ry`Ho8N kbX8$xTM '#Language "WWB-COM" LiN$
pwm 'script for calculating thermal image map n9W(bG o 'edited rnp 4 november 2005 V,lOt4b Z]>O+ 'declarations x gVeN[" Dim op As T_OPERATION MU@UfB|;u Dim trm As T_TRIMVOLUME 3oF45`3FV Dim irrad(32,32) As Double 'make consistent with sampling _<n~n]% Dim temp As Double >?2M
}TV3 Dim emiss As Double TaZmRL Dim fname As String, fullfilepath As String lk/n}bx #^u$ 'Option Explicit sEp"D+f (9''MlGd% Sub Main @K &GJ 'USER INPUTS M'?,] an nx = 31 2V-
16Q'% ny = 31 >c1qpk/ numRays = 1000 GFj{K minWave = 7 'microns D=q:*x maxWave = 11 'microns n,vct<&z@ sigma = 5.67e-14 'watts/mm^2/deg k^4 s 1A.+ fname = "teapotimage.dat" T,,WoPU8t ^cOUQ33 Print "" t6bV?nc Print "THERMAL IMAGE CALCULATION" y`Wty@ ~^NtO detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 .5^cb%B* ,?J! Print "found detector array at node " & detnode z`.<U{5 [<Mx2<8f srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 C)[,4wt, j+i\bks Print "found differential detector area at node " & srcnode ;5]Lf$tZ ,`'Qi%O GetTrimVolume detnode, trm zJq~!#pZ detx = trm.xSemiApe [+rfAW>p} dety = trm.ySemiApe 7x"R3 area = 4 * detx * dety z Xg3[orF Print "detector array semiaperture dimensions are " & detx & " by " & dety \r/rBa\ Print "sampling is " & nx & " by " & ny VQc_|z_s k|e7a2Wwt 'reset differential detector area dimensions to be consistent with sampling [>jbhV' pixelx = 2 * detx / nx .p<:II:6 pixely = 2 * dety / ny Vh'P&W?[ SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False u(z$fG:g Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 j@n)kPo,1 kYzIp 'reset the source power `!obGMTQ< SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) >~''&vdsk\ Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" &Qf/>@ l} QmQ=q7 'zero out irradiance array A!od9W6 For i = 0 To ny - 1 ui<N[ For j = 0 To nx - 1 8H%;WU9- irrad(i,j) = 0.0 }5ret Next j 3lf=b~Zi) Next i
-WY<zJ $.Qkb@} 'main loop p2hB8zL EnableTextPrinting( False ) UE8kpa)cQ %v=*Wb\3| ypos = dety + pixely / 2 QVv#fy1"6 For i = 0 To ny - 1 hCi 60%g/n xpos = -detx - pixelx / 2 4V{:uuI;f ypos = ypos - pixely ${<%" hR$ "Bh}}!13 EnableTextPrinting( True ) ;@mS^ik")$ Print i {0[tNth'h EnableTextPrinting( False ) T`9lV2x*P Xe3U`P7( }fp-pe69z For j = 0 To nx - 1 KN^=i5K+Y =rMUov h xpos = xpos + pixelx 'f#{{KA hwPw]Ln/ 'shift source `{f}3bO7C LockOperationUpdates srcnode, True 4)S,3G GetOperation srcnode, 1, op Jf{*PgP op.val1 = xpos Lz
|?ek7Q op.val2 = ypos 1jx:;j SetOperation srcnode, 1, op h\$$JeSV] LockOperationUpdates srcnode, False j@AIK+0Qc YDIG,%uv raytrace iJ ($YvF4 DeleteRays Z-$[\le CreateSource srcnode )%`c_FL@N= TraceExisting 'draw +vw\y uF X#`^r` 'radiometry ]{sU&GqBLe For k = 0 To GetEntityCount()-1 =Z{O<xw' If IsSurface( k ) Then y8d]9sX{ temp = AuxDataGetData( k, "temperature" ) ^-TE([ bW emiss = AuxDataGetData( k, "emissivity" ) r7RIRg_ If ( temp <> 0 And emiss <> 0 ) Then ;@0;pY ProjSolidAngleByPi = GetSurfIncidentPower( k ) M-$%Rzl_ frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) #%pI(,o= irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi ]MqMQLG0t End If 9Uh"iMB +=>,Pto< End If 7z%L*z8V 5 )A1\ Next k d8DV[{^ ML}J\7R Next j y|jl[pyg) \q>bs|2 Next i %h hfU6[ EnableTextPrinting( True ) ;d@#XIS&-( =h-U
'write out file -{KQr1{5UM fullfilepath = CurDir() & "\" & fname %Si6]3-^@ Open fullfilepath For Output As #1 EZgq ?l~5O Print #1, "GRID " & nx & " " & ny TCMCK_SQL Print #1, "1e+308" >>QY'1Eu Print #1, pixelx & " " & pixely l94b^W}1)W Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 HNb/-e ," ~Sdb_EZ maxRow = nx - 1 <3oWEm maxCol = ny - 1 aKJwofD For rowNum = 0 To maxRow ' begin loop over rows (constant X) R]JT&p|w.1 row = "" bc7/V#W For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) <h!_>:2L row = row & irrad(colNum,rowNum) & " " ' append column data to row string _Ym]Mj' ln Next colNum ' end loop over columns <S5BDk
|{&{ Print #1, row d.[8c=$ _H9 MwJ Next rowNum ' end loop over rows .fn\]rUv Close #1 ;p.v]0]is d}Xr} Print "File written: " & fullfilepath Av$]|b Print "All done!!" OP;v bZ End Sub b
k~(^!R +*\u :n 在输出报告中,我们会看到脚本对光源的孔径和功率做了修改,并最终经过31次迭代,将所有的热成像数据以dat的格式放置于: |e=,oV" c\/=iVw, y>S.?H:P 找到Tools工具,点击Open plot files in 3D chart并找到该文件 Juo^ , N'F77
. n"$jG:AQJ 打开后,选择二维平面图: &PL8 |