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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。 m@4Dz| ";K w? 成像示意图 QU).q65p 首先我们建立十字元件命名为Target 4qQ,1&!]S }47h0 i 创建方法: eVXXn)> :L[>!~YG_n 面1 : {K,In)4 面型:plane aB]0?C y9( 材料:Air P6:C/B 孔径:X=1.5, Y=6,Z=0.075,形状选择Box oUv26t~ xnP!P2 ]{>AU^=U 辅助数据: @A/k"Ax{r 首先在第一行输入temperature :300K, Jz@~$L emissivity:0.1; (f# (B2j ym%UuC3^w P?54"$b 面2 : TktH28tK 面型:plane K+B978XD 材料:Air UiFH*HT 孔径:X=1.5, Y=6,Z=0.075,形状选择Box .|UQ)J?s u^80NR %Tm*^ 位置坐标:绕Z轴旋转90度, +a1x; {Mx(|)WkL $NXP)Lic) 辅助数据: F@w; .e! * QgKo$IF 首先在第一行输入temperature :300K,emissivity: 0.1; Uzu6>yT <wH+\ %`Re{%1; Target 元件距离坐标原点-161mm; {28|LwmL 4=zs& zw0w."V
单透镜参数设定:F=100, bend=0, 位置位于坐标原点 %bW_,b xP;r3u
s C8N)!5(A 探测器参数设定: !rvEo =^ )Fw/Cu 在菜单栏中选择Create/Element Primitive /plane vvoxK 0 vF$i"^;tJ; ZL MH~cc Ui{%q@ Vz{+3vfra6 6cQgp]% 元件半径为20mm*20,mm,距离坐标原点200mm。 KyvZ?R ?$ r`T]>`2 光源创建: d0cL9&~qW NFK`, 光源类型选择为任意平面,光源半角设定为15度。 $vO&C6m$ x0*{oP I.2J-pu} 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。 Jd2.j?P= 6*OL.~WE 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。 $o^Z$VmL gEA SYIQ ]I*c:(qwu 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。 !3v&+Jrf6 FMfpjuHk 创建分析面: gL; Kie6Z ZzT=m*tQ& 0c_xPBbB+ 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。 Bf_$BCyGW eRauyL"Q+ r-2k<#^r 到此,所有的光学结构和属性设定完成,通过光线追迹我们可以查看光线是否可以穿过元件。 sE1cvAw9l 8a)AuAi?! FRED在探测器上穿过多个像素点迭代来创建热图 C*9X;+S0J "tK%]c d- FRED具有一个内置的可编译的Basic脚本语言。从Visual Basic脚本语言里,几乎所有用户图形界面(GUI)命令是可用这里的。FRED同样具有自动的客户端和服务器能力,它可以被调用和并调用其他可启动程序,如Excel。因此可以在探测器像素点上定义多个离轴光源,及在FRED Basic脚本语言里的For Next loops语句沿着探测器像素点向上和向下扫描来反向追迹光线,这样可以使用三维图表查看器(Tools/Open plot files in 3D chart)调用和查看数据。 En5oi 将如下的代码放置在树形文件夹 Embedded Scripts, %x)bZ=An WWT1= #" f0<zK! 打开后清空里面的内容,此脚本为通用脚本适用于一切可热成像的应用。 /@os*c|je }Q7y tE 绿色字体为说明文字, boh?Xt-$ #;!&8iH '#Language "WWB-COM" W&z jb>0b0 'script for calculating thermal image map xU
*:a[g 'edited rnp 4 november 2005 n,la<N] &W `xZyb3 'declarations >}5?`.K~Q* Dim op As T_OPERATION gk ]QR. Dim trm As T_TRIMVOLUME g 7oY 1; Dim irrad(32,32) As Double 'make consistent with sampling Onmmcem Dim temp As Double 4s\spvJ Dim emiss As Double h}bfZL Dim fname As String, fullfilepath As String KKeMi@N QYJ
EUC@ 'Option Explicit 0=d2_YzSf 1Pf(.&/9_ Sub Main 49$P 'USER INPUTS 7#8Gn=g nx = 31 *kr/,_K ny = 31 V\~. numRays = 1000 ^aFm6HS1 minWave = 7 'microns {.Tx70kn maxWave = 11 'microns \l+v,ELX= sigma = 5.67e-14 'watts/mm^2/deg k^4 K}*ets1s} fname = "teapotimage.dat" .nV2n@SR DM.lQ0xk Print "" oy+|:[v:Fk Print "THERMAL IMAGE CALCULATION" |dRVSVN {C1crp>q detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 :qYp%Ub OLw]BJXYaE Print "found detector array at node " & detnode .Po"qoGy 8\"<t/_
W srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 |diI(2w L"_XWno Print "found differential detector area at node " & srcnode =KRM`_QShg 7 WJ\nK GetTrimVolume detnode, trm bMH~vR detx = trm.xSemiApe ZsGvv]P dety = trm.ySemiApe .6?"<zdPU area = 4 * detx * dety 5=>1>HYM Print "detector array semiaperture dimensions are " & detx & " by " & dety Lp`.fn8Ln Print "sampling is " & nx & " by " & ny A2
l?F tRjv- 'reset differential detector area dimensions to be consistent with sampling Daf|.5>(@ pixelx = 2 * detx / nx dj gk7 pixely = 2 * dety / ny 56.!L SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False ^@fD{]I Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 =C\Tl-$\f F^ q{[Z 'reset the source power HB07 n4 | SetSourcePower( srcnode, Sin(DegToRad(15))^2 )
'g v0;L Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" *dBy<dIy sqkWQ`Ur 'zero out irradiance array FaHOutP For i = 0 To ny - 1 (f/(q-7VWt For j = 0 To nx - 1 ^W |YE72Y irrad(i,j) = 0.0 PN*
.9;5Z Next j ^'UM@dd?! Next i ;?h[WIy {gMe<y 'main loop Mw[3711v EnableTextPrinting( False ) qpQ;,8X-" [lmF2 ypos = dety + pixely / 2 {DO 9%ej) For i = 0 To ny - 1 j#HXuV6 xpos = -detx - pixelx / 2 (*-wiL ypos = ypos - pixely }T5@P {3P3 \S}/2]* 1 EnableTextPrinting( True ) '|}A/` Print i XM'tIE+| EnableTextPrinting( False ) A U~DbU0O i'Y8-}) Q_mphW:[ For j = 0 To nx - 1 .Rr^AGA4 ;hj lRQ\ xpos = xpos + pixelx Rv1W &s& -L2.cN_ 'shift source c3]t"TA, LockOperationUpdates srcnode, True '%$Vmf)= GetOperation srcnode, 1, op )f?I{ op.val1 = xpos +p u[JHF op.val2 = ypos >%/x~UFc5 SetOperation srcnode, 1, op E@VQxB7+ LockOperationUpdates srcnode, False ?m7:@GOE1 )~2\4t4|g raytrace S-t#d7'B DeleteRays YQ0#j'}/ CreateSource srcnode 5es t TraceExisting 'draw )JMqC+J3*t +C~h( 'radiometry EJ:O 1 For k = 0 To GetEntityCount()-1 M/ S~"iD If IsSurface( k ) Then }'[>~&/" temp = AuxDataGetData( k, "temperature" ) EQ%o oAb8 emiss = AuxDataGetData( k, "emissivity" ) ;i@S}LwL If ( temp <> 0 And emiss <> 0 ) Then Z\
hcK: ProjSolidAngleByPi = GetSurfIncidentPower( k ) mK:gj&N7X| frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) OGZD$j irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi IDct!53~ End If dT|XcVKg 7_~ A*LM End If reu[rZ& NcA
`E_3 Next k C% -Tw]T$_ @3`5(xwzm Next j zlMh^+rMX ybaY+![* Next i +p 6Ty2rz EnableTextPrinting( True ) ]r`;89:s> Eq-+g1a 'write out file hHJiGVJ=V fullfilepath = CurDir() & "\" & fname `[H^` Open fullfilepath For Output As #1 o.Kn DY Print #1, "GRID " & nx & " " & ny 5|*{~O| Print #1, "1e+308" "GMU~594 Print #1, pixelx & " " & pixely U]hqRL Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 IQ&PPC aH}/+Hu- maxRow = nx - 1 bBIh}aDN maxCol = ny - 1 0ix(1`Z For rowNum = 0 To maxRow ' begin loop over rows (constant X) *aErwGLB8 row = "" e=;A3S For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) 1UP
{j`-K| row = row & irrad(colNum,rowNum) & " " ' append column data to row string l7`{ O/hN Next colNum ' end loop over columns Jn+ -G4h$ n#!c!EfG Print #1, row I`_2Q:r Es>' N3A
z Next rowNum ' end loop over rows pRQ7rT',v Close #1 KL \>-
4DL;Y Print "File written: " & fullfilepath BU -;P Print "All done!!" 7@@g|l] End Sub -A#p22D,5 ; Z:[LJd 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/cV59 bjVk9XvH6 461g7R%r 找到Tools工具,点击Open plot files in 3D chart并找到该文件 21TR_0g&< KV0*dB; b1Vr>:sK47 打开后,选择二维平面图: eT
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