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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。 <RKT
| !Au#j^5K-o 成像示意图 XO+rg&Pu 首先我们建立十字元件命名为Target =*1NVi $n T*nP-b 创建方法: K)U[xS;< \<ysJgqUG 面1 : l0C`teO
面型:plane 4(p`xdr}K 材料:Air C]p@7"l 孔径:X=1.5, Y=6,Z=0.075,形状选择Box -n8d#Qm) hD=.rDvO j+@3.^vK 辅助数据: uFhaN\S 首先在第一行输入temperature :300K, )U=]HpuzI emissivity:0.1; !I.}[9N Ptf(p` ^GyZycch 面2 : $xWUzg1<U 面型:plane z_N";Rn 材料:Air \5 rJ 孔径:X=1.5, Y=6,Z=0.075,形状选择Box k/D{&(F ~ `CI_zc=jx G bclR:G 位置坐标:绕Z轴旋转90度, 0EF~Ouef g/fpXO\ P#7=h:.522 辅助数据: - Z`RKR8C UKQ"sC 首先在第一行输入temperature :300K,emissivity: 0.1; #=={h?UDT pQK SPr > (9\ cF{ Target 元件距离坐标原点-161mm; .p, VZ9 O`Gq7=X J|].h 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 W"^ =RY ~7 U~ marZA'u%B1 探测器参数设定: T4HJy| a5GLbanF 在菜单栏中选择Create/Element Primitive /plane EG;E !0 BqY_N8l&E )+hV+rM jp P/girce0 CF2Bd:mfZ Hddc-7s 元件半径为20mm*20,mm,距离坐标原点200mm。 tw>2<zmSi% avL_>7q 光源创建: JD~;.3$/k Z sTtSM\Ac 光源类型选择为任意平面,光源半角设定为15度。 4]uj+J uTxa5j `}$o<CJ 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。 Ph1XI&us9 L]|mWyzT 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[T+/Ej& n+Kv^Y`qxO B+j]C$8} 功率数值设定为:P=sin2(theta) theta为光源半角15度。我们为什么要这么设定,在第二部分会给出详细的公式推导。 J6AHc"k. O,%,dtD[a 创建分析面: jb-kg</A WXl+w7jr w8UuwFG?< 到这里元件参数设定完成,现在我们设定元件的光学属性,在前面我们分别对第一和第二面设定的温度和发射系数,散射属性我们设定为黑朗伯,4%的散射。并分别赋予到面一和面二。 /v8Q17O?e q8?kBKP S@FO&o 0 到此,所有的光学结构和属性设定完成,通过光线追迹我们可以查看光线是否可以穿过元件。 Ki2!sADd cKe %P|8 FRED在探测器上穿过多个像素点迭代来创建热图 %, kP_[!>Q _!R$a- 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。 Jpj=d@Of70 将如下的代码放置在树形文件夹 Embedded Scripts, `t&{^ a&Y" #Ub_m@@4 t>I.1AS 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。 .h7s.p? L^3&
绿色字体为说明文字, _`|1B$@x K>@yk9)vi '#Language "WWB-COM" \ ;npdFy 'script for calculating thermal image map xzm]v9k& 'edited rnp 4 november 2005 aa`(2%(: U]iI8c 'declarations @h%V:c Dim op As T_OPERATION 2Wz8E2. Dim trm As T_TRIMVOLUME a /sj W Dim irrad(32,32) As Double 'make consistent with sampling uZS : Dim temp As Double ^dHQ<L3.* Dim emiss As Double gBm'9|? Dim fname As String, fullfilepath As String PgWWa*Ew NXU:b"G
S 'Option Explicit !Rn6x
$_ Ae+)RBpc Sub Main `Vb 'USER INPUTS Nr~$i% [ nx = 31 <(L@@.87R ny = 31 cz>,sz~i numRays = 1000 2 |s ohF minWave = 7 'microns I,j4 BU4 maxWave = 11 'microns 5i!Q55Yv=, sigma = 5.67e-14 'watts/mm^2/deg k^4 WQK<z!W5 fname = "teapotimage.dat" Oj5UG* FzT.9Vz7 Print "" ,,'jyqD Print "THERMAL IMAGE CALCULATION" I0Pw~Jj{ ~s!Q0G^G detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 SS=<\q#MS 4G c
M Print "found detector array at node " & detnode 1i76u!{U 9%/hoA) srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 za>UE,?h Z*%;;&? Print "found differential detector area at node " & srcnode kQ`tY`3F 'cW^ S7 GetTrimVolume detnode, trm Ms{";qiG detx = trm.xSemiApe 3S0.sU~_U dety = trm.ySemiApe Td=4V,BN area = 4 * detx * dety -/yqiC-yx Print "detector array semiaperture dimensions are " & detx & " by " & dety `g)}jo`W Print "sampling is " & nx & " by " & ny )`\hK U
v2.Jo/Q 'reset differential detector area dimensions to be consistent with sampling `ONjEl pixelx = 2 * detx / nx m&.LJ*uM\K pixely = 2 * dety / ny X 'Ss#s>g SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False bx0.(Nv/X Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 y+k_&ss +)Z]<O 'reset the source power ALF0d|>=uj SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) YG "Ta|@5 Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" 51#*8u+L ^9g$/8[^c_ 'zero out irradiance array "g{q=[U} For i = 0 To ny - 1 v, $r.g; For j = 0 To nx - 1 @IT[-d irrad(i,j) = 0.0 aAo|3KCs Next j dGIdSQ~ _ Next i DD|0?i L$ZjMJ 'main loop b+rxin". EnableTextPrinting( False ) 4"d,=P.{ 8:ubtB ypos = dety + pixely / 2 hnnB4]c For i = 0 To ny - 1 {!"UBALxc xpos = -detx - pixelx / 2 NVyBEAoh ypos = ypos - pixely @CMI$}!{V +>ju,;4WK EnableTextPrinting( True ) #lYyL`B+~ Print i ks405 EnableTextPrinting( False ) i! .]U@{k cG|fau<G @=-(H<0 For j = 0 To nx - 1 LCF}Y{ ]z'&oz xpos = xpos + pixelx {15j'Qwm !b8V&< 'shift source <I+k B^ Er LockOperationUpdates srcnode, True ({f}Z-% GetOperation srcnode, 1, op _jWs(OmJ op.val1 = xpos k[6J;/ op.val2 = ypos Ltlp9 S SetOperation srcnode, 1, op ]?9*Vr:P^ LockOperationUpdates srcnode, False J2mHPVA3 /x VHd raytrace UhxM85M;x DeleteRays _y@28t CreateSource srcnode c4JV~VS+ TraceExisting 'draw <2$vo Q@D7\<t 'radiometry du65=w4E! For k = 0 To GetEntityCount()-1 %I1@{>OxG If IsSurface( k ) Then inP2y ?j temp = AuxDataGetData( k, "temperature" ) "<,lqIqA; emiss = AuxDataGetData( k, "emissivity" ) +8Xjk\Hi If ( temp <> 0 And emiss <> 0 ) Then |z-f8$ ProjSolidAngleByPi = GetSurfIncidentPower( k ) *ap,r&]#F frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) *a9cBl'_ irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi !09)WtsEfx End If C @(@n!o:! {)YbksrJ{ End If uLhGp@Dx iaGA9l<b Next k IH|zNg{\Y pUIN`ya[[ Next j qeZG/\, |v&)O)Jg Next i 1w,_D.1' EnableTextPrinting( True ) ]so/AdT9hA %~rEJB@{ 'write out file oD)x\ )t8 fullfilepath = CurDir() & "\" & fname byHc0ktI\ Open fullfilepath For Output As #1 E`HoJhB Print #1, "GRID " & nx & " " & ny XlppA3JON| Print #1, "1e+308" 4:/]Y=)x Print #1, pixelx & " " & pixely ^e:z ul{;] Print #1, -detx+pixelx/2 & " " & -dety+pixely/2
hkK>h 'gwh: maxRow = nx - 1 H2X_WSwm maxCol = ny - 1 K#3^GB3P For rowNum = 0 To maxRow ' begin loop over rows (constant X) LdUz;sb row = "" '+Dsmoy For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) T(!1\ TB row = row & irrad(colNum,rowNum) & " " ' append column data to row string Ly=. Next colNum ' end loop over columns pF;.nt) qe]D4K8`Q3 Print #1, row /[R=-s ; 0s n$QmW: Next rowNum ' end loop over rows D
T5d]MU Close #1 V@'Xj .ze ,NO[Piok Print "File written: " & fullfilepath YPK@BmAdE Print "All done!!" 5'!fi]Z End Sub z)Rkd0/X Kz'GAm\ 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: ak 7% K1
f1T {`HbpM<=m] 找到Tools工具,点击Open plot files in 3D chart并找到该文件 kQ\GVI11? ib,`0=0= O ~WrpJjI[ 打开后,选择二维平面图: l)r\SE1 +3,7 Apj
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