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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。 :KJG3j?
)N8[@ 成像示意图 LV^V`m0# 首先我们建立十字元件命名为Target Jj~c&LxrO dFu<h 创建方法: j"8 f,er {Q&@vbw' 面1 : qMk"i@" 面型:plane ,}("es\b 材料:Air 7lo`)3mB 孔径:X=1.5, Y=6,Z=0.075,形状选择Box (&=<UGY(w YkPc& Ac0^` 辅助数据:
KKfC^g 首先在第一行输入temperature :300K, =`8%qh emissivity:0.1; `W3;LTPEb Yt 9{:+[RK |
JmEI9n2 面2 : R::0.*FF 面型:plane ^[7ZB mS 材料:Air -|?I'~[#( 孔径:X=1.5, Y=6,Z=0.075,形状选择Box /_N*6a~ @E(_H$|E 7rc6 位置坐标:绕Z轴旋转90度, =Me94w>G3X ZQZBap" 3$.R=MQ7 辅助数据: nX@lR~g%F r[>=iim 首先在第一行输入temperature :300K,emissivity: 0.1; e~Oge Y7|R vLWoP qoNVp7uv Target 元件距离坐标原点-161mm; ,?OV39h Ca SoR | :'L^zGf 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 ?B)jnBh| 9q?\F x=UwyZ 探测器参数设定: M![aty@ )FNvtLZ 在菜单栏中选择Create/Element Primitive /plane L(p{>Ykcc `
>w4G|{ i\2d1Z l3d^V&Sk .|[5*- 5hVp2w- 元件半径为20mm*20,mm,距离坐标原点200mm。 S%h[e[[fST U"1z"PcV 光源创建: .L,xqd[zC WUVRwJ 5 光源类型选择为任意平面,光源半角设定为15度。 VtNY~ I:6N?lD4}0 iIOA5 4!o 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。 C*;g!~{ .
6wyu7oK 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。 P1<Y7+n $ekB+
t:cj e <Hbm 功率数值设定为:P=sin2(theta) theta为光源半角15度。我们为什么要这么设定,在第二部分会给出详细的公式推导。 (+@
Lnz\ X[Lwx.Ly8 创建分析面: nUAoPE )2@_V % -&PiD 到这里元件参数设定完成,现在我们设定元件的光学属性,在前面我们分别对第一和第二面设定的温度和发射系数,散射属性我们设定为黑朗伯,4%的散射。并分别赋予到面一和面二。 /H_,1Fu| 9<0p1W O 0!WF,)/T7i 到此,所有的光学结构和属性设定完成,通过光线追迹我们可以查看光线是否可以穿过元件。 ?tWcx;h:> K#j<G]I( @ FRED在探测器上穿过多个像素点迭代来创建热图 f0uzoeL<% 8PQn=k9 FRED具有一个内置的可编译的Basic脚本语言。从Visual Basic脚本语言里,几乎所有用户图形界面(GUI)命令是可用这里的。FRED同样具有自动的客户端和服务器能力,它可以被调用和并调用其他可启动程序,如Excel。因此可以在探测器像素点上定义多个离轴光源,及在FRED Basic脚本语言里的For Next loops语句沿着探测器像素点向上和向下扫描来反向追迹光线,这样可以使用三维图表查看器(Tools/Open plot files in 3D chart)调用和查看数据。 ]9xuLJ) 将如下的代码放置在树形文件夹 Embedded Scripts, BPp`r_m8w} `rt 8.-0_C*U; 打开后清空里面的内容,此脚本为通用脚本适用于一切可热成像的应用。 <kQ
5sG X!} t`` 绿色字体为说明文字, c7$L: mv7><C '#Language "WWB-COM" (!-gX"<b 'script for calculating thermal image map [dG&"%5vD 'edited rnp 4 november 2005 ,o$F~KPu 8MHYk>O~{G 'declarations m/,.3v Dim op As T_OPERATION "}_b,5lkGK Dim trm As T_TRIMVOLUME gWt}q-@nRR Dim irrad(32,32) As Double 'make consistent with sampling 1Sk=;Bic Dim temp As Double T#;W5<" Dim emiss As Double 3F5Y#[L` Dim fname As String, fullfilepath As String ].W)eMC*c( ` ZO#n 'Option Explicit hT`kma p2]@yE7w Sub Main
U 6(( 'USER INPUTS VR86ok nx = 31 M2K{{pGJ[& ny = 31 N=1zhI:VaQ numRays = 1000 4uQ\JD(*Eu minWave = 7 'microns 0GUm~zi1 maxWave = 11 'microns )tH.P:
1~, sigma = 5.67e-14 'watts/mm^2/deg k^4 "/ N ?$ fname = "teapotimage.dat" gb b2!q6p 4CO"> : Print "" 6OBe^/ZRt Print "THERMAL IMAGE CALCULATION" 3j'A.S kq;1Ax0{ detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 VrV
)qfG ]_Cm 5Z7 Print "found detector array at node " & detnode 3NI3b-7 Rne#z2Ok srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 v"nN[_T iD*%' #u Print "found differential detector area at node " & srcnode DtXQLL*fl( #BB,6E
GetTrimVolume detnode, trm HGuU6@~hu detx = trm.xSemiApe j_`
[Z dety = trm.ySemiApe []i/\0C^ area = 4 * detx * dety nz{
;]U1 Print "detector array semiaperture dimensions are " & detx & " by " & dety s)Gnj; Print "sampling is " & nx & " by " & ny bW"bkA80 -s?f <f{ 'reset differential detector area dimensions to be consistent with sampling ^!Y]l pixelx = 2 * detx / nx xC3h m pixely = 2 * dety / ny ,2t|(V*"& SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False @vsgmz Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 ?q^o|Y/ n$2IaE;v 'reset the source power fL0dy[Ch@ SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) w}8
,ICL Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" AcZ{B< A
-C.Bi;/ 'zero out irradiance array r]h>Bb For i = 0 To ny - 1 OQlmzg For j = 0 To nx - 1 7a$K@iWU irrad(i,j) = 0.0 #Hn<4g"AjM Next j -cgLEl1 J Next i Q6Ay$*y=D s9[?{}gd 'main loop a0wSXd EnableTextPrinting( False ) NCrNlHIF )b%t4~7 ypos = dety + pixely / 2 rJjNoY For i = 0 To ny - 1 m:6^yfS xpos = -detx - pixelx / 2 Mi>! ypos = ypos - pixely ae%Bl[ a&^HvXO(>( EnableTextPrinting( True ) [b2KBww\ Print i ,9A1p06 EnableTextPrinting( False ) 'CQ~ZV5 B$ =oU DOaTp f For j = 0 To nx - 1 WGmXq. @AB}r1E2 xpos = xpos + pixelx }3825 c)*,">$# 'shift source I cJy$+ LockOperationUpdates srcnode, True w3n6md GetOperation srcnode, 1, op 1bz%O2U-( op.val1 = xpos *VUD!`F op.val2 = ypos {PGiNY%q SetOperation srcnode, 1, op }1xD*[W
LockOperationUpdates srcnode, False ;\'d9C k)3b0T@b 'raytrace 9QXBz=Fnf DeleteRays D'8xP %P CreateSource srcnode [Qw BSq8) TraceExisting 'draw Exb?eHO
rSg OQ 'radiometry ;s$,}O. For k = 0 To GetEntityCount()-1 V}Ok>6(~ If IsSurface( k ) Then [ML|,kq! temp = AuxDataGetData( k, "temperature" ) ts:YJAu+F emiss = AuxDataGetData( k, "emissivity" ) ^)nIf)9}7 If ( temp <> 0 And emiss <> 0 ) Then 3(oB[9]s ProjSolidAngleByPi = GetSurfIncidentPower( k ) |j2$G~B6 frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) E%b*MU irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi nk*T
x End If N,3 )`Vm MaS-*;BY, End If ,q K'! B*@0l: Next k )MWbZAI @oNYMQ@)d Next j @e#{Sm _'mK=`>u Next i 1CR)1H EnableTextPrinting( True ) 4=nh'
U38 8C=8Wjm 'write out file TFZxk fullfilepath = CurDir() & "\" & fname =h>jo&=Wad Open fullfilepath For Output As #1 (|2:^T+ Print #1, "GRID " & nx & " " & ny }~#Tsv Print #1, "1e+308" YlC$L$%Zd. Print #1, pixelx & " " & pixely z.T>=C Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 hnnVp_<] I_s* pT maxRow = nx - 1 rYCIU maxCol = ny - 1 M:*)l( For rowNum = 0 To maxRow ' begin loop over rows (constant X) wZg~k\_lF row = "" e9;5.m For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) zq'KX/o row = row & irrad(colNum,rowNum) & " " ' append column data to row string 8b:GyC5L Next colNum ' end loop over columns S}3? 7PbwCRg Print #1, row STL+tLJ 3rj7]:Vr Next rowNum ' end loop over rows W|L#Q/
RX Close #1 C <d]0) @:/H)F^x Print "File written: " & fullfilepath _Wtwh0[r* Print "All done!!" yIu_DFq% End Sub 2dCD.9s9~ FL[,?RU?2 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: -`CE; ?s@=DDB\u ?$6(@>`f&t 找到Tools工具,点击Open plot files in 3D chart并找到该文件 > ofWHl[- HE:]zH G.~Ffk 打开后,选择二维平面图: xz-?sD/xe )@],0yL
QQ:2987619807 XC!Y {lp
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