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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。 cz~11j# 5OqsnL_V 成像示意图 J3S byI!T 首先我们建立十字元件命名为Target m3!MHe~t ph'SS=!. 创建方法: >Vm (2\ekct ^ 面1 : `e;Sjf< 面型:plane [ Zqg"` 材料:Air cZF;f{t 孔径:X=1.5, Y=6,Z=0.075,形状选择Box QS?9&+JM | B-p5;h> 7
,~Krzv 辅助数据: \yizIo.Y` 首先在第一行输入temperature :300K, NP`ll0s emissivity:0.1; ;HwJw\fo ;Wm)e~`, tJfN6 面2 : ~(P\F&A(& 面型:plane Y$5v3E\uc 材料:Air NW
Qu-]P 孔径:X=1.5, Y=6,Z=0.075,形状选择Box _BaS\U%1( `X03Q[:q"[ s/|'1E\F 位置坐标:绕Z轴旋转90度, ?O^:j!C6 T<,tC" `.Q3s?1F 辅助数据: AQGE(%X 5fv6RQD 首先在第一行输入temperature :300K,emissivity: 0.1; =umS^fJ5` A+*(Pds bv" ({:x Target 元件距离坐标原点-161mm; .tZ$a_O /P}tgcs l),13"?C( 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 %R "nm / UBAQ8TR &,|uTIs 探测器参数设定: [NDYJ'VGe @D{[Hj`< 在菜单栏中选择Create/Element Primitive /plane IUG.q8 <VsZ$ ds[~Cp skArocs K?eo)|4)DB 'm((G4 元件半径为20mm*20,mm,距离坐标原点200mm。 ;:1mv cne[-E 光源创建: </Lqk3S-! *xKR;?. 光源类型选择为任意平面,光源半角设定为15度。 _~<TAFBr n-WvIy Ds/zl Z 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。 Onyq' I[ C.iILL 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。 0nn#U RH'R6 Dn!V)T 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。 sNTfRPC 1 crjRbi 创建分析面: w|#79,& o4795r,jz XRin~wz|S 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。 u^9,u/gj vsR&1hs W5 }zJ)x 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。 ,+{ 43;a Rh^$0Q*2 FRED在探测器上穿过多个像素点迭代来创建热图 5$w1[}UUd JJa?"82FXZ 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。 $S/ 8T 将如下的代码放置在树形文件夹 Embedded Scripts, BC+qeocg IS~oyFS (~4AG \ 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。 [ j_jee d{jl&:
绿色字体为说明文字, .d,Zx mZ%\`H+ '#Language "WWB-COM" kE}Ib4]J 'script for calculating thermal image map xDS9gGr 'edited rnp 4 november 2005 H(| v P n DZi 'declarations 48VsHqG Dim op As T_OPERATION v4G kf Dim trm As T_TRIMVOLUME >@o*v*25 Dim irrad(32,32) As Double 'make consistent with sampling c{0?gt. Dim temp As Double ~<3yTl> Dim emiss As Double 'rgV]Oy Dim fname As String, fullfilepath As String
%G*D0pE P7!Sc 'Option Explicit ~Hf,MLMdTf :yeTzIz] Sub Main `Hqu2
'` 'USER INPUTS c@P, nx = 31 aJts ny = 31 ZBWe,Xvq numRays = 1000 O)?0G$0 minWave = 7 'microns =v}.sJ V? maxWave = 11 'microns 1['A1, sigma = 5.67e-14 'watts/mm^2/deg k^4 0%GWc}o fname = "teapotimage.dat" 6 s/O\A 62q-7nV Print "" ' =kX Print "THERMAL IMAGE CALCULATION" .0
K8h:I 'AoH2 | detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 6lGL.m'Ra gYZgo Print "found detector array at node " & detnode }\ F>z $}829<gh7 srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 V l%k: C%&7,F7 Print "found differential detector area at node " & srcnode
J&?kezs iT5%X GetTrimVolume detnode, trm pJIH_H detx = trm.xSemiApe gDrqs>8 dety = trm.ySemiApe }`X$
' area = 4 * detx * dety "(5}=T@, Print "detector array semiaperture dimensions are " & detx & " by " & dety [
kknY+n1 Print "sampling is " & nx & " by " & ny +q(D]:@,[ d0,I] " 'reset differential detector area dimensions to be consistent with sampling "T'!cy pixelx = 2 * detx / nx j8b:+io pixely = 2 * dety / ny l40$}!!< SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False 6m]L{ buP Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 z)0F k 2+'&||h 'reset the source power
Qj~0vx! SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) 9f
"*Oj Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" _i&\G}mrC ]PFc8qv{ 'zero out irradiance array Ldu!uihx For i = 0 To ny - 1 >/>a++19 For j = 0 To nx - 1 S'WmPv irrad(i,j) = 0.0 ;pNfdII( Next j psMagzr&)e Next i J]%P
fWV
tnsYY 'main loop )gR&Ms4 EnableTextPrinting( False ) >TE&myZ?* 9H<:\-: ypos = dety + pixely / 2 LRs{nN.N For i = 0 To ny - 1 `yhL11]~ xpos = -detx - pixelx / 2 P
_ SJK ypos = ypos - pixely ,Ubnz U>>J_2 EnableTextPrinting( True ) qIk6S6 Print i iJ\#su EnableTextPrinting( False ) )z aMycW \6N\6=t!A q/[)mr|~ For j = 0 To nx - 1 Deam%)bXM] 6Hz=VhQrN xpos = xpos + pixelx 0-5:"SN' w9 NUm 'shift source mr*zl* LockOperationUpdates srcnode, True .RT5sj\d GetOperation srcnode, 1, op -~5yl} op.val1 = xpos `1P
& op.val2 = ypos DCNuvrZ SetOperation srcnode, 1, op B!5gD
LockOperationUpdates srcnode, False '
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| fF9vV. } raytrace -Ju!2by DeleteRays `a J[
!O CreateSource srcnode m^ILcp!
TraceExisting 'draw Jlzhn#5c- <"t >!I 'radiometry 8mV35A7l For k = 0 To GetEntityCount()-1 h7*m+/ O If IsSurface( k ) Then ]!f=b\-Av temp = AuxDataGetData( k, "temperature" ) #):FXB$a emiss = AuxDataGetData( k, "emissivity" ) 67#;.}4a If ( temp <> 0 And emiss <> 0 ) Then rsP1?Hxq ProjSolidAngleByPi = GetSurfIncidentPower( k ) uto4bs: frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) #R)$nv:h?^ irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi dkXK0k End If j3FDGDrg e]rWR End If -O ej6sILO /JvNJ
f Next k [1s B 0iwx$u7[ Next j 5VISP4a kefQH\<X Next i a.q= EnableTextPrinting( True ) ua2SW(C@ x1TB
(^aX 'write out file S3 &L fullfilepath = CurDir() & "\" & fname E*CY/F I_ Open fullfilepath For Output As #1 \s,ZE6dQ Print #1, "GRID " & nx & " " & ny wp} PQw: Print #1, "1e+308" .~Td/o7 Print #1, pixelx & " " & pixely r;9F@/ Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 .aNy)Yu8 b,I$.&BD maxRow = nx - 1 :sJVklK maxCol = ny - 1
B[8 For rowNum = 0 To maxRow ' begin loop over rows (constant X) Jz3u r)| row = "" A9[l5E For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) c$>Tfa'H row = row & irrad(colNum,rowNum) & " " ' append column data to row string /S]<MS Next colNum ' end loop over columns <zrGPwk 3C5<MxtK
Print #1, row @dw0oRF p6|0JBm Next rowNum ' end loop over rows z`'{l{ Close #1 u3kZOsG ^xFZ;Yf Print "File written: " & fullfilepath |LWG7
ZE Print "All done!!" !}<Y^=" End Sub IojF/ IE,xiV 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: E7ixl~ HPT$)NeNc ]H%y7kH8 找到Tools工具,点击Open plot files in 3D chart并找到该文件 EE-jU<>| 8eQ 4[wJY tKu'Q;J 打开后,选择二维平面图: Y=\;$:L[ bfhap(F~(e
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