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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。 f~{}zGTM: HO)/dZNU 成像示意图 cLY c6 首先我们建立十字元件命名为Target ;Xvp6.: q.4A(, 创建方法: +;}#B~: k
n[Y 面1 :
qFQ8 面型:plane W5L iXM 材料:Air &sXRN&Fp 孔径:X=1.5, Y=6,Z=0.075,形状选择Box mo{MR:>) `#-P[q<v- ] b9-k 辅助数据: kql0J|P? 首先在第一行输入temperature :300K, )vg5((C emissivity:0.1; P|tNL}2`; R"MRnr_4K :,b
iyJt 面2 : :u8(^]N 面型:plane 0Uk@\[1ox 材料:Air SUKxkc( 孔径:X=1.5, Y=6,Z=0.075,形状选择Box I\~G|B ?Iyo9&1& C;QAT 位置坐标:绕Z轴旋转90度, +
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< #GDe08rOw 辅助数据: +Q=1AXe ]u l$* 首先在第一行输入temperature :300K,emissivity: 0.1; `@[c8j7 B+C);WQ, 'I;!pUfVp Target 元件距离坐标原点-161mm; )*; zW!H g.c8FP+ VvFC -r,=G 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 0;4t&v7 #_Z$2L"U Uw,2}yR 探测器参数设定: OouPj@r b^D$jY 在菜单栏中选择Create/Element Primitive /plane -[U1]R kr$b^"Ku ydw)mT44K ?pgG,=? #ET/ = )ZrS{vY 元件半径为20mm*20,mm,距离坐标原点200mm。 O=SkAsim %AOja+ 光源创建: MX4]Vpv PP:(EN1 光源类型选择为任意平面,光源半角设定为15度。 r]3'74j: E*L iM5+I OpM(j& 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。 Mu'8;9_6 `n$5+a+ 我们在位置选项又设定一行的目的是通过脚本自动控制光源在探测器平面不同划分区域内不同位置处追迹光线。 [,2|Flf
e AU-n&uX b'6-dU% 功率数值设定为:P=sin2(theta) theta为光源半角15度。我们为什么要这么设定,在第二部分会给出详细的公式推导。 8-y{a.,u. 7jnIv];i 创建分析面: yG Wnod' vSi_t
K4 Z2im@c67{ 到这里元件参数设定完成,现在我们设定元件的光学属性,在前面我们分别对第一和第二面设定的温度和发射系数,散射属性我们设定为黑朗伯,4%的散射。并分别赋予到面一和面二。 cUTE$/#s rx(2yf *tm0R> ?! 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。 Y0D}g3` PJ cwH6m FRED在探测器上穿过多个像素点迭代来创建热图 gTA%uRBa hstbz 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。 ^v.,y3 将如下的代码放置在树形文件夹 Embedded Scripts, hXqD<? 4C}bJzZ pb#?l6x$+ 打开后清空里面的内容,此脚本为通用脚本适用于一切可热成像的应用。 GnP|x}YM aW!@f[%~F 绿色字体为说明文字, z25m_[p2 R+&jD;U{ '#Language "WWB-COM" 5/po2V9) 'script for calculating thermal image map l}$ U])an# 'edited rnp 4 november 2005 t3dlS`O 5jUYN-$GO 'declarations >yY'7Ey Dim op As T_OPERATION :n /@z4# Dim trm As T_TRIMVOLUME z{Mr$%'EY Dim irrad(32,32) As Double 'make consistent with sampling S[7WW$lF Dim temp As Double TEDAb> Dim emiss As Double Duc#$YfGm Dim fname As String, fullfilepath As String *
S=\l@EW D@!=d@V. 'Option Explicit gn3jy^5 qhT@;W/X Sub Main Zh_|m#) 'USER INPUTS JPGzrEaZ nx = 31 i\W/C ny = 31 -!c"k}N= numRays = 1000 qIld;v8w"g minWave = 7 'microns T0&f8 maxWave = 11 'microns C-iK$/U sigma = 5.67e-14 'watts/mm^2/deg k^4 ;]_o4e6\p fname = "teapotimage.dat" [,TkFbDq"J {J^lX/D Print "" n> ^[T[.S Print "THERMAL IMAGE CALCULATION" 1UKg=A-q (
H6c{'& detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 :>+s0~ cK 06]-Y Print "found detector array at node " & detnode 1x[)/@.'f _1U1(^) srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 ?2>FdtH nxr!`^Mne Print "found differential detector area at node " & srcnode ;pnD0bH 8>7&E- GetTrimVolume detnode, trm 4q<=K= F detx = trm.xSemiApe R9B&dvG dety = trm.ySemiApe ^$t7+g area = 4 * detx * dety J_FNAdQt Print "detector array semiaperture dimensions are " & detx & " by " & dety %Qj;, #z Print "sampling is " & nx & " by " & ny |^A ;&// +Z85HY{ 'reset differential detector area dimensions to be consistent with sampling t*?0D\b
2 pixelx = 2 * detx / nx
6H'HxB4 pixely = 2 * dety / ny 5|1T}Z#; SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False clk[ /'1 Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 8O Soel 8cA~R- 'reset the source power z`\F@pX%wC SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) x:QgjK Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" zD<or&6 f4BnX(1u 'zero out irradiance array VqS#waNrx For i = 0 To ny - 1 AZmb!}m+d For j = 0 To nx - 1 9D4NX<_ irrad(i,j) = 0.0 HQB(* Next j D&S26jrZ Next i ;g~TWy^o 6,9o>zT%H 'main loop /IsS;0K%L EnableTextPrinting( False ) pZeE61c/
7[.6axL ypos = dety + pixely / 2 ,~"$k[M For i = 0 To ny - 1 "U\4:k`: xpos = -detx - pixelx / 2 TY Qwy* ypos = ypos - pixely 1Uqu>' >$ e9igwe EnableTextPrinting( True ) 5:kH;/U Print i ndeebXw* EnableTextPrinting( False ) 4 M(-xl? Lliqj1& gmm|A9+tv For j = 0 To nx - 1 mL4] l(U 1n@8Kv xpos = xpos + pixelx \.3D~2cU n+PzA[ 'shift source DS'n LockOperationUpdates srcnode, True qBCK40 GetOperation srcnode, 1, op {\(L%\sV@ op.val1 = xpos ;vIrGZV< op.val2 = ypos d`F&aC SetOperation srcnode, 1, op q5#J~n8Wr LockOperationUpdates srcnode, False tuhA
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D3 raytrace FD8N"p DeleteRays -k"^o!p CreateSource srcnode IhA* " TraceExisting 'draw ;]pJj6J&v >2Kh0rIH 'radiometry PoT`}-9 For k = 0 To GetEntityCount()-1 %Jrt4sg[j- If IsSurface( k ) Then smry2*g temp = AuxDataGetData( k, "temperature" ) o5Q{/ emiss = AuxDataGetData( k, "emissivity" ) xa
pq*oj If ( temp <> 0 And emiss <> 0 ) Then G;~V ProjSolidAngleByPi = GetSurfIncidentPower( k ) YxP@!U9dE, frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) jb^N|zb irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi \xS&v7b End If 48*Do}l] k0Uyf~p~ End If )kkhJI*v afb+GA! Next k Qu]z)";7 ,Bal Next j `^4vT3e F
3'9u# Next i wV^V]c ?U EnableTextPrinting( True ) zBe8,, e QJ7L7S 'write out file G3{=@Z1 fullfilepath = CurDir() & "\" & fname |K|h+fgG6* Open fullfilepath For Output As #1 7%{ | Print #1, "GRID " & nx & " " & ny aM$W*-Y Print #1, "1e+308" I;1lX
L Print #1, pixelx & " " & pixely A21N|$[ Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 ryFxn|4 #Z<a
maxRow = nx - 1 Z" uY}P3 maxCol = ny - 1 MC{
2X For rowNum = 0 To maxRow ' begin loop over rows (constant X) oun;rMq row = "" ?:L:EW8 For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) qvv2O1c"A row = row & irrad(colNum,rowNum) & " " ' append column data to row string T
N!=@Gy Next colNum ' end loop over columns +fnK/%b tT79p.z B Print #1, row rQaxr! Yp:KI7 Next rowNum ' end loop over rows %3$*K\Ai Close #1 ]7/
b/J Bdu&V*0g Print "File written: " & fullfilepath //4Xq8y Print "All done!!" u3o#{~E/# End Sub NZ3/5%We/ $e /^u[~: 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: gL3"Gg3 !0dNQ[$82 bcZf>:gVf 找到Tools工具,点击Open plot files in 3D chart并找到该文件 /-i!;! zrU{@z$l q]\g,a 打开后,选择二维平面图: c~v~2DM v%RP0%%{s
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