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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。 HA.NZkq.tV :IT U0%;!+ 成像示意图 `?o1cf A
首先我们建立十字元件命名为Target _ K+V?-= {.D2ON 创建方法: 1xdESorX( ~R?dDL 面1 : <,X+`m& 面型:plane ul=a\;3x#| 材料:Air /IJ9_To 孔径:X=1.5, Y=6,Z=0.075,形状选择Box
~\:j9cC Kpp*^ ilRm}lU|x 辅助数据: !:5`im;i 首先在第一行输入temperature :300K, 4}8+)Pd emissivity:0.1; M`C~6Mf+ zUEfa!#? [%iUg\'7d 面2 : KG-k$glD 面型:plane G\:psx/ 材料:Air Z:o
86~su 孔径:X=1.5, Y=6,Z=0.075,形状选择Box L >Ez- rGn5QV ngkeJ)M0$ 位置坐标:绕Z轴旋转90度, QK3j_'F=E nhQ44qRgQ 61+pryW%g 辅助数据: Y0L5W;iM D=82$$ 首先在第一行输入temperature :300K,emissivity: 0.1; 2 -p [zh4W*K_cq {80oRD2=Q Target 元件距离坐标原点-161mm; !7kLFW 17n+4J] / 8WpX 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 j""y2c1 }[KDE{,V tJh3$K\ 探测器参数设定: ;vI*ThzdD EBIa%, 在菜单栏中选择Create/Element Primitive /plane *_{l !rsa4t@t (ifqwl62 TJyH/C ET,0ux9F ! =\DC,-CB 元件半径为20mm*20,mm,距离坐标原点200mm。 ~`~%(DA= r(,= uLc 光源创建:
rTP5-4 w;yiX<t< 光源类型选择为任意平面,光源半角设定为15度。 yBPt%EF ]{Mci]H6T cXOje"5i 我们将光源设定在探测器位置上,具体的原理解释请见本章第二部分。 bRK CY6 q:2aPfo& 我们在位置选项又设定一行的目的是通过脚本自动控制光源在探测器平面不同划分区域内不同位置处追迹光线。 TXd5v#_vo v9t47>V aDN6MZM 功率数值设定为:P=sin2(theta) theta为光源半角15度。我们为什么要这么设定,在第二部分会给出详细的公式推导。 LXh@o1 hs!UX=x| 创建分析面: |5}rX!wS4 8 l'bRyuS xf V,==uF 到这里元件参数设定完成,现在我们设定元件的光学属性,在前面我们分别对第一和第二面设定的温度和发射系数,散射属性我们设定为黑朗伯,4%的散射。并分别赋予到面一和面二。 !"`@sd~ ih+*T1#:( 7]/dg*A )C 到此,所有的光学结构和属性设定完成,通过光线追迹我们可以查看光线是否可以穿过元件。 {[M0y*^64$ "<PoJPh FRED在探测器上穿过多个像素点迭代来创建热图 KMxNH,5 `2B*CMW{ 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。 }
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?n?' 将如下的代码放置在树形文件夹 Embedded Scripts, d]O_E4X* `G=ztL!gq {h/OnBwG 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。 h`
irO5 p3M#XC_H] 绿色字体为说明文字, /~o7Q$)-b YBYB OH '#Language "WWB-COM" 8iMF 8\ 'script for calculating thermal image map z+3<$Z 'edited rnp 4 november 2005 ~-XOvKJb ]&Y#)ebs 'declarations T[5gom Dim op As T_OPERATION ~t'#n V Dim trm As T_TRIMVOLUME -M7K8 Dim irrad(32,32) As Double 'make consistent with sampling x4CtSGG85f Dim temp As Double -Z:]<;qU Dim emiss As Double |?OdV<5C Dim fname As String, fullfilepath As String .dD9&n;#^ +V)qep" 'Option Explicit OOEV-= 2Pbe~[ Sub Main ES^>[2Y 'USER INPUTS Uj4Lu nx = 31 u]
F70C^~ ny = 31 qSFc=Wwc numRays = 1000 XXa(305 minWave = 7 'microns iP<k1#k maxWave = 11 'microns Um]p&phVL sigma = 5.67e-14 'watts/mm^2/deg k^4 6-mmi7IfO fname = "teapotimage.dat" 6OfdD.y z=ML(1c= Print "" GE%2/z p Print "THERMAL IMAGE CALCULATION" -'I _*fu ]vm\3=@}9 detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 Sa%zre@ uz ]E_&2 Print "found detector array at node " & detnode @O@fyAz `@h:_d srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 .CVUEK@Z4 RXGHD19] Print "found differential detector area at node " & srcnode .qSBh
hH\ ;knd7SC GetTrimVolume detnode, trm Nc{]zWL9 detx = trm.xSemiApe d!`lsh@tF dety = trm.ySemiApe Qm
$(
area = 4 * detx * dety Hl4\M]]/& Print "detector array semiaperture dimensions are " & detx & " by " & dety 7N>oY$&) Print "sampling is " & nx & " by " & ny vT?Q^PTO CXTt(-FT 'reset differential detector area dimensions to be consistent with sampling *i`v~> pixelx = 2 * detx / nx
RXBb:f pixely = 2 * dety / ny b& V`<'{ SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False L'>s(CR Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 |</"N-#S ,
Hn7(^t 'reset the source power ue@8voZhS/ SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) wuKl-:S;Vs Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" ,!`SY) 0Qm"n6NQ 'zero out irradiance array gF3TwAr For i = 0 To ny - 1 mV<i JZh For j = 0 To nx - 1 DMB"Y, irrad(i,j) = 0.0 Xq|nJ|h Next j (B&h;U$HAH Next i UV4u.7y prZ55MS. 'main loop WE")xhV6 EnableTextPrinting( False ) ?L=A2C\_- o
w2$o\hC ypos = dety + pixely / 2 cqEHYJ;B For i = 0 To ny - 1 ,*dzJT$k xpos = -detx - pixelx / 2 <{giHT ypos = ypos - pixely N=#4L$@- 7$
d}!S EnableTextPrinting( True ) Q!K`e )R Print i M`~!u/D7 EnableTextPrinting( False ) $_)=8"Sn ,>u=gA&} ob'n{T+lZ For j = 0 To nx - 1 k^^:;OR AliRpxxd xpos = xpos + pixelx 7IW> >RBF {7X#4o0 'shift source 8Y#bN*! LockOperationUpdates srcnode, True 0N{+y}/G GetOperation srcnode, 1, op ,d|vP)SS op.val1 = xpos hq?jdNy
: op.val2 = ypos ~s#e,Kav" SetOperation srcnode, 1, op IZ 8y}2 LockOperationUpdates srcnode, False =MC~GXJSNw 6
mO" 'raytrace o'Pu'y DeleteRays ^uW%v2 CreateSource srcnode [?KJ9~+0 TraceExisting 'draw #.<V^ 9=
V>f)R 'radiometry 'S?;J ,/ For k = 0 To GetEntityCount()-1 &x0C4Kh If IsSurface( k ) Then zE`R,:VI temp = AuxDataGetData( k, "temperature" ) cx^{/U?9} emiss = AuxDataGetData( k, "emissivity" ) YsP/p- If ( temp <> 0 And emiss <> 0 ) Then B!b sTvX ProjSolidAngleByPi = GetSurfIncidentPower( k ) )47MFNr~> frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) ?+r!z irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi qX$u4I!, End If LmQ/#Gx m=TJDr- End If ?z/Vgk+9| (R'+jWH Next k z856 nl =x0No*#|' Next j sS!w}o2X \dq!q=b\ Next i 5)'P'kVi7. EnableTextPrinting( True ) B8m_'!;; "+|L_iuNQ 'write out file Y-p<qL|_ fullfilepath = CurDir() & "\" & fname (ZP87Gz Open fullfilepath For Output As #1 [$a<b/4 Print #1, "GRID " & nx & " " & ny PJgp+u< Print #1, "1e+308" j'GtgT Print #1, pixelx & " " & pixely }"zC
>eX& Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 |NrrTN?> phP>3f.T maxRow = nx - 1 !QEL"iJ6M' maxCol = ny - 1 f:xWu- For rowNum = 0 To maxRow ' begin loop over rows (constant X) #Qbl=o4 row = "" k\N4@UK For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) (][LQ6Pc row = row & irrad(colNum,rowNum) & " " ' append column data to row string :Q@)*kQH Next colNum ' end loop over columns 0oU=RbC ;/LD)$_ Print #1, row [vTMS2 s_eOcm Next rowNum ' end loop over rows 0JY WrPR Close #1 7*s8ttX 4h|dHXYZ Print "File written: " & fullfilepath DQJG,?e{ Print "All done!!" 0^~\COa End Sub 6EJVD!#[K 61_f3S(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: xx8U$,Ng UG2w 1xqHw N4UM82N 找到Tools工具,点击Open plot files in 3D chart并找到该文件 $-vo}k%M eW8[I'v_& |n6Eg9 打开后,选择二维平面图: bJ3(ckhq N/~N7MwJj
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