infotek |
2023-04-06 08:38 |
十字元件热成像分析
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。 D2y[?RG !y$:}W?_
成像示意图 TQ,KPf$0U 首先我们建立十字元件命名为Target ee}HQ.}Ja >1$vG 创建方法: =d*5TyAcu 9n#lDL O 面1 : #Q]^9/;|4n 面型:plane ?mA%`*=q 材料:Air {f(RY j 孔径:X=1.5, Y=6,Z=0.075,形状选择Box ^vY[d]R _\ n^t!+
Wik8V 0( 辅助数据: SWLt5dV 首先在第一行输入temperature :300K, {@&%Bq*& emissivity:0.1; +T/T \[ rqi/nW \-W|)H 面2 : E*Z # fa 面型:plane _C%:AFPP> 材料:Air M%z$yU`ac 孔径:X=1.5, Y=6,Z=0.075,形状选择Box `3e>JIl"0 '@{Mq%` pQNTN.L9NZ 位置坐标:绕Z轴旋转90度, h@{mcz fe4Ki
6ec#3~ Y] 辅助数据: 9 S4bg7 ccY! OSae 首先在第一行输入temperature :300K,emissivity: 0.1; 8W2oGL6 NVX @1} (3Dz'X Target 元件距离坐标原点-161mm; 6%B) }{S+C[:_
Fz {T; 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 mHF?t.y (Zoopkxw UbEK2&q/8 探测器参数设定: ms{iQ:'9 GO]5~4k 在菜单栏中选择Create/Element Primitive /plane skP'- ^F~ b[rVr
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sKwUY{u\M mXOY,g2w !T"jvDYH 8)ykXx/f@ 元件半径为20mm*20,mm,距离坐标原点200mm。 ?`/DFI'_G LEC=@) B 光源创建: WD >z Y[rRz6.*( 光源类型选择为任意平面,光源半角设定为15度。 @q"HZO[ "O/
6SV isU4D 我们将光源设定在探测器位置上,具体的原理解释请见本章第二部分。 \h@3dJ4 (H6Mi.uZ 我们在位置选项又设定一行的目的是通过脚本自动控制光源在探测器平面不同划分区域内不同位置处追迹光线。 )?;+<, /@?lV!QiO &&ZX<wOM 功率数值设定为:P=sin2(theta) theta为光源半角15度。我们为什么要这么设定,在第二部分会给出详细的公式推导。 [tk6Kx8a uE,g|51H/ 创建分析面: c<ORmg6 Yy'CBIq#f 6E{(_i 到这里元件参数设定完成,现在我们设定元件的光学属性,在前面我们分别对第一和第二面设定的温度和发射系数,散射属性我们设定为黑朗伯,4%的散射。并分别赋予到面一和面二。 ;~GBD] <!q_C5>XJ
?UV|m 到此,所有的光学结构和属性设定完成,通过光线追迹我们可以查看光线是否可以穿过元件。 2QgD< im@QJ: FRED在探测器上穿过多个像素点迭代来创建热图 bJcO,M:2 hrW2#v FRED具有一个内置的可编译的Basic脚本语言。从Visual Basic脚本语言里,几乎所有用户图形界面(GUI)命令是可用这里的。FRED同样具有自动的客户端和服务器能力,它可以被调用和并调用其他可启动程序,如Excel。因此可以在探测器像素点上定义多个离轴光源,及在FRED Basic脚本语言里的For Next loops语句沿着探测器像素点向上和向下扫描来反向追迹光线,这样可以使用三维图表查看器(Tools/Open plot files in 3D chart)调用和查看数据。 ,Bs/.htQj 将如下的代码放置在树形文件夹 Embedded Scripts, l?B=5*0 .Vrl:
)lU9\"?o 打开后清空里面的内容,此脚本为通用脚本适用于一切可热成像的应用。 #A&49a3^1 @a i2A| 绿色字体为说明文字, E?FUr?-[ cHC4Y&&uZ '#Language "WWB-COM" @77+K:9I7 'script for calculating thermal image map 9v/=o`J#
'edited rnp 4 november 2005 X<Ag['r e F)my 'declarations ~3)d?{5 Dim op As T_OPERATION !j/54, Dim trm As T_TRIMVOLUME =~TPrO^ Dim irrad(32,32) As Double 'make consistent with sampling 1<Vke$ Dim temp As Double 05Q4$P Dim emiss As Double Gkm{b[ Dim fname As String, fullfilepath As String u6 Yp,!+ 2B"tT"f 'Option Explicit Vqr]Ui ji
C2B Sub Main ZgfhNI\ 'USER INPUTS B,] AfH nx = 31 +g;{c+Kw: ny = 31 3Ww 37V>h numRays = 1000 >T)tAZ?WK minWave = 7 'microns LqLhZBU9 maxWave = 11 'microns .hJcK/m sigma = 5.67e-14 'watts/mm^2/deg k^4 <}G/x*N fname = "teapotimage.dat" yL %88,/ QO:Z8{21So Print "" Zb&"W]HSf Print "THERMAL IMAGE CALCULATION" kGAB' \Vpv78QF; detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 $o/i /
wcj $>T(31)c Print "found detector array at node " & detnode B`YD>oCN ~~@dbB srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 `FwE^_9d ?6UjD5NkX Print "found differential detector area at node " & srcnode ]Upr<! ix"BLn]YZ GetTrimVolume detnode, trm 7\N }QP0"u detx = trm.xSemiApe ~14|y|\/ dety = trm.ySemiApe ..5.": area = 4 * detx * dety i-9W8A Print "detector array semiaperture dimensions are " & detx & " by " & dety r4d#;S9{o Print "sampling is " & nx & " by " & ny S f6%A eVd:C8q 'reset differential detector area dimensions to be consistent with sampling kgI8PybY pixelx = 2 * detx / nx T[<554
pixely = 2 * dety / ny u@tH6k*cBz SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False q/Zs]Gz Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 wYLodMaYH H^dw=kS 'reset the source power U'u_'5{ SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) ui-]%~ Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" %{rPA3Xoy hl0\$ 'zero out irradiance array uzT+, For i = 0 To ny - 1 x3sX=jIW_ For j = 0 To nx - 1 rGrR; irrad(i,j) = 0.0 L c
)i Next j FzykC Next i XMz*}B6GQ X"9N<)C 'main loop 6"NtVfui EnableTextPrinting( False ) YkE_7r(1 5V~vND*
s ypos = dety + pixely / 2 WX]O1Y For i = 0 To ny - 1 _BONN6=*y xpos = -detx - pixelx / 2 (BngwLVDK ypos = ypos - pixely IVy<>xpt s}-j.jzB{ EnableTextPrinting( True ) 4>HaKJ-c# Print i 2.N)N%@ EnableTextPrinting( False ) It<VjN9
\RtFF @eDs)mY For j = 0 To nx - 1 f96`n+>xi fwmXIpteK xpos = xpos + pixelx
?!<Q8= -ssmj8:Q\| 'shift source mkfDDl2 GP LockOperationUpdates srcnode, True X&h?1lMJ / GetOperation srcnode, 1, op ,F*HZBNFZ op.val1 = xpos j9yOkaVEg op.val2 = ypos NEPK SetOperation srcnode, 1, op m`):= ^nC LockOperationUpdates srcnode, False oRJ!TAbD aOd|;Z 'raytrace R*D5n>~ DeleteRays *&\6x}.I4 CreateSource srcnode w{u,YM(Q TraceExisting 'draw :R3iLy kr@!j@j$ 'radiometry ;(jL`L F For k = 0 To GetEntityCount()-1 fJ0V|o If IsSurface( k ) Then CrSBN~ temp = AuxDataGetData( k, "temperature" ) G Y.iCub emiss = AuxDataGetData( k, "emissivity" ) ]N;nq If ( temp <> 0 And emiss <> 0 ) Then 'U*#71S ProjSolidAngleByPi = GetSurfIncidentPower( k ) _ker,;{9C frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) ~kj96w4eAR irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi ^Sj;~ End If O*bzp-6\ zGNW5S9G End If )_n(u3' >8x)\'w Next k /R?[/`)f& -T i<H9OV Next j F6{/iF SS24@:"{ Next i tN_=&|{WE4 EnableTextPrinting( True ) U$y wO4. YJ-<t6 'write out file y\(xYB>T fullfilepath = CurDir() & "\" & fname _~{J."q Open fullfilepath For Output As #1 3
{hUp81> Print #1, "GRID " & nx & " " & ny )db:jPkwd Print #1, "1e+308" Oo-4WqRJ Print #1, pixelx & " " & pixely ),y`Iw Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 ,fTC}>s4 7'65+c[& maxRow = nx - 1 -;ra(L` maxCol = ny - 1 %`K{0b For rowNum = 0 To maxRow ' begin loop over rows (constant X) fAz4>_4 row = "" E.sZjo1 For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) w^^l, row = row & irrad(colNum,rowNum) & " " ' append column data to row string 3TLym& Next colNum ' end loop over columns [i.c;'Wy/ :8`$BbV Print #1, row FGie*t e==/+ Next rowNum ' end loop over rows LR!%iP Close #1 $T:;KcW) o2bmsnXQ Print "File written: " & fullfilepath nk_X_y Print "All done!!" &cT | |