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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。 uKF?UXc sU"D%G 成像示意图 'j>+eA> 首先我们建立十字元件命名为Target z,/0e@B > 5^lroC-(x 创建方法: 9B&QY 2v e _\]Q- 面1 : X^mvsY 面型:plane (CKx
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I@ 材料:Air i1RU5IRy|j 孔径:X=1.5, Y=6,Z=0.075,形状选择Box 9 ![oJ3 nHxos`Qx gIv :<EJ9 辅助数据: UO(B>Abp 首先在第一行输入temperature :300K, V
{R<R2h1 emissivity:0.1; OM5"&ZIZb g7!P| yGl
(QLk 面2 : -kY7~yS7 面型:plane (3YqM7cqt 材料:Air o3*IfD 孔径:X=1.5, Y=6,Z=0.075,形状选择Box x
8lgDO yIC.JmD* `M?C( 位置坐标:绕Z轴旋转90度, gIrVrAV# Fhw:@@= }}Ah-QU 辅助数据: !%b.k6%>w [OFg
(R- 首先在第一行输入temperature :300K,emissivity: 0.1; OoOKr G4g<PFx gNr/rp9A$m Target 元件距离坐标原点-161mm; \z!*)v/{- .&d]7@!qy z#*M}RR 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 S^|Uzc F. X{(8 O)C
y4[ 探测器参数设定: a x1 Di{T3~fqU 在菜单栏中选择Create/Element Primitive /plane rQT@:$) H|>dF)%pj F[/Bp>P7 l{wHu(1 hPtSY'_@_ kOR5'rh 元件半径为20mm*20,mm,距离坐标原点200mm。 dA-ik Omo1p(y 光源创建: !
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e= 光源类型选择为任意平面,光源半角设定为15度。 U085qKyCw `-!t 8BH @2Xw17[f35 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。 T'.U?G J<dr x_gc 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。 a>A29*q +
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")TP= 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。 \YO1 ;\W ]5IG00` 创建分析面: D%k%kg0, kSGFLP1FN [O*5\&6 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。 FEgM4m.(G< [ 9)9>- SPKGbp& 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。 ?H8w/{J cy|]}n85 FRED在探测器上穿过多个像素点迭代来创建热图 HU]Yv+3 tWL3F?wd 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。 cA%70Y:AV 将如下的代码放置在树形文件夹 Embedded Scripts, +r[u4? zOA{S~> 3~H_UGw 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。 K~"uZa^s H%NP4pK 绿色字体为说明文字, HV'xDy[) 9?<WRM3a> '#Language "WWB-COM" 0/?V _ 'script for calculating thermal image map 5Z{i't0CQ 'edited rnp 4 november 2005 ~PYMtg=i @8X)hpHf 'declarations
HSHY0 Dim op As T_OPERATION $ ;cZq Dim trm As T_TRIMVOLUME >mRA|0$ Dim irrad(32,32) As Double 'make consistent with sampling ^qXc%hj g Dim temp As Double NT?Gl( Dim emiss As Double *BzqAi0 Dim fname As String, fullfilepath As String >?K@zsv} d5&avL\ 'Option Explicit `
MIZqHM @ R,[dEP Sub Main yHL 2! 'USER INPUTS 6J[ {?, nx = 31 }MBxfZ 4I ny = 31 F?Cx"JYix numRays = 1000 Wk w.z minWave = 7 'microns ?)<DEu:Y maxWave = 11 'microns nDx}6}5) sigma = 5.67e-14 'watts/mm^2/deg k^4 +[C(hhk(" fname = "teapotimage.dat" Gs]m; "o|
d*80eB9P Print "" 9^ITP!~e* Print "THERMAL IMAGE CALCULATION" "<6X=|C _bB:1l?V detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 M:V'vme)+ q_PxmPE@3v Print "found detector array at node " & detnode \fG?j@Qx 3>X]`Oj7y srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 :tclYX @-y.Y}k#$~ Print "found differential detector area at node " & srcnode KSsv~!3Yf 4DaLt&1 GetTrimVolume detnode, trm >jxo,xz detx = trm.xSemiApe }gw
\w?/ dety = trm.ySemiApe V'TBt=!=] area = 4 * detx * dety +\~.cP7[ Print "detector array semiaperture dimensions are " & detx & " by " & dety $g? ]9}p Print "sampling is " & nx & " by " & ny fWo}gH~ L{_Q%!h3] 'reset differential detector area dimensions to be consistent with sampling C-Y~T;53 pixelx = 2 * detx / nx Q?df5{6 pixely = 2 * dety / ny NzB"u+jB SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False J`/ t;xk Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 zzlV((8~ fLM5L_S}Y 'reset the source power +>BLox6 SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) -Lh\] Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" <1i:Z*l. KLVkPix;$ 'zero out irradiance array 7Gg3$E+#* For i = 0 To ny - 1 j>f For j = 0 To nx - 1 n.+%eYM< irrad(i,j) = 0.0 m~`d<RM/ Next j jI})\5<R Next i :&*Y
Io /SDN7M]m! 'main loop J^t-p U EnableTextPrinting( False ) \@IEqm6 V`*N2ztSL ypos = dety + pixely / 2 39
D!e& For i = 0 To ny - 1 kpT>xS^6< xpos = -detx - pixelx / 2 Zj,1)ii ypos = ypos - pixely 45g:q ~<[$.8* EnableTextPrinting( True ) .!#0eAT Print i -J7BEx EnableTextPrinting( False ) 7.V'T=@x3) SrlTwcD c8uFLM j For j = 0 To nx - 1 KO*# ^+g )Fe6>tE xpos = xpos + pixelx 6T*MKu 7X+SK&PX 'shift source m/
D ~D~ LockOperationUpdates srcnode, True mab921-n GetOperation srcnode, 1, op *`D}voU op.val1 = xpos e:W]B)0/e op.val2 = ypos O9%`G SetOperation srcnode, 1, op ^qB
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LockOperationUpdates srcnode, False 0j{Rsy &6ymGo raytrace *uJ0ZO9 DeleteRays m
|Isi CreateSource srcnode 0v7#vZ TraceExisting 'draw o2AfMSt. 1Ce7\A 'radiometry Ax"]+pb For k = 0 To GetEntityCount()-1 ^"lVTDsU If IsSurface( k ) Then QMO.Bnek temp = AuxDataGetData( k, "temperature" ) eyM<#3\\S emiss = AuxDataGetData( k, "emissivity" ) /\7E&n:)2 If ( temp <> 0 And emiss <> 0 ) Then g|STeg g ProjSolidAngleByPi = GetSurfIncidentPower( k ) \mK;BWg) frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) `!BP.-Zv irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi \zCwD0Z End If h7r*5E P8&BtA End If :mYVHLmea g:dtfa/] Next k KM-d8^\: io&FW!J. Next j }Gvu!a#R pL [JGn Next i ,J*C'#sW EnableTextPrinting( True ) ey/{Z<D X}V}% 'write out file "O}u2B b fullfilepath = CurDir() & "\" & fname Am'%tw
~ Open fullfilepath For Output As #1 jw 4B^2} Print #1, "GRID " & nx & " " & ny ?hC,49 Print #1, "1e+308" S4ys)!V1V Print #1, pixelx & " " & pixely mJU1n
Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 VTUY#+3 #fGI#]SG? maxRow = nx - 1 C%RYQpY*c maxCol = ny - 1 W(#u^,$e[ For rowNum = 0 To maxRow ' begin loop over rows (constant X) Y5fz_ [(" row = "" i! <1&{ For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) R:+cumHr
row = row & irrad(colNum,rowNum) & " " ' append column data to row string I4"(4u@P Next colNum ' end loop over columns |KMwK
png [r#m +R"N Print #1, row 7g7[a/Bts uh<e-;vU Next rowNum ' end loop over rows oKMr Pr[` Close #1 v\Y8+dD saa3BuV 6 Print "File written: " & fullfilepath PDgd'y Print "All done!!" M\_IQj End Sub f1$'av -HU4Ow 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: Ee3-oHa x
DiGN Jc A8X3|<n= 找到Tools工具,点击Open plot files in 3D chart并找到该文件 \1ncr4 Ur9L8EdC wJc`^gj 打开后,选择二维平面图: j 06mky Y*QoD9<T?;
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