| infotek |
2022-01-24 09:30 |
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。 9+o`/lk1 *Fe
成像示意图 l&f"qF? 首先我们建立十字元件命名为Target :QV-! quPNwNy 创建方法: &2EimP <FfdOK_ 面1 : _RHB ^y;- 面型:plane Xj^Hy"HC^~ 材料:Air 9Rg|o CP_ 孔径:X=1.5, Y=6,Z=0.075,形状选择Box 4._U 0A}'@N@G)
?7Y6: zo$^ 辅助数据: b;X|[tB 首先在第一行输入temperature :300K, \LQ?s)~ emissivity:0.1; BmP!/i_ AP8YY8,
X{j`H\'L 面2 : ?IWLH-fkP 面型:plane 5w#
Ceg9 材料:Air srbU}u3VZ 孔径:X=1.5, Y=6,Z=0.075,形状选择Box bCv^za]P6 Sas&P:#r ZT\=:X*e 位置坐标:绕Z轴旋转90度, aOj(=s dZ1/w0<M2
[-*1M4D9 辅助数据: HX(Z(rcI _|!FhZ 首先在第一行输入temperature :300K,emissivity: 0.1; }5 2] |N{?LKR
% L1'#wH Target 元件距离坐标原点-161mm; ac-R q.GQY ]~!jf
nbVlP 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 l Wa4X#~. a2{nrGD P2q'P& 探测器参数设定: [HV>4,,3" Od?M4Ed( 在菜单栏中选择Create/Element Primitive /plane eq|G\XJ ?W#>9WQi
errT7&@,A -27uh y2>XLELy @213KmB. 元件半径为20mm*20,mm,距离坐标原点200mm。 @bc=O1vX~; rW~hFSrV[o 光源创建: $[p<}o/6v] &s +DK` 光源类型选择为任意平面,光源半角设定为15度。 3M;[.b ~F</s. `YZK$
-, 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。 Y55Yo5<j/+ 7lo`)3mB 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。 @+9x8*~S' /GzA89N( ]w3-No 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。 bD&^-&
G Lq&;`)BJ 创建分析面: `30og]F0YJ rj.]M6# Zd~l_V f 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。 w
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4oY<O 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。 )9^0Qk' ] AI$r^t1 FRED在探测器上穿过多个像素点迭代来创建热图 bJ[{[|yEd OZ/P@`kN.f FRED具有一个内置的可编译的Basic脚本语言。从Visual Basic脚本语言里,几乎所有用户图形界面(GUI)命令是可用这里的。FRED同样具有自动的客户端和服务器能力,它可以被调用和并调用其他可启动程序,如Excel。因此可以在探测器像素点上定义多个离轴光源,及在FRED Basic脚本语言里的For Next loops语句沿着探测器像素点向上和向下扫描来反向追迹光线,这样可以使用三维图表查看器(Tools/Open plot files in 3D chart)调用和查看数据。 FD}hw9VyF@ 将如下的代码放置在树形文件夹 Embedded Scripts, 4`x.d c
k$ > yk
{Hv/|.),hu 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。 Y7|R vLWoP kl0!*j 绿色字体为说明文字, ,?OV39h Ca SoR | '#Language "WWB-COM" :YZqrcr} 'script for calculating thermal image map mSw$?
> 'edited rnp 4 november 2005 O4Wn+$AN x=UwyZ 'declarations Cr!}qZq Dim op As T_OPERATION .>5KwEK~ Dim trm As T_TRIMVOLUME 4K_ fN Dim irrad(32,32) As Double 'make consistent with sampling %n^jho5 Dim temp As Double %0>DjzYt Dim emiss As Double e?Pzhha Dim fname As String, fullfilepath As String >S3,_@C GI&XL'K& 'Option Explicit !>~W5c^ c$cb2V7, Sub Main N36<EHq 'USER INPUTS C q/936`O nx = 31 `N+A8 ny = 31 U_/sY9gz( numRays = 1000 SDdefB minWave = 7 'microns x@-bY maxWave = 11 'microns :# 1d;jx sigma = 5.67e-14 'watts/mm^2/deg k^4 6`KAl rH fname = "teapotimage.dat" P/BWFN1 8"d0Su4r Print "" uR|?5DK Print "THERMAL IMAGE CALCULATION" r<Il;?S6 mN>7vJ detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 th@a./h" "bO\Wt#Mf Print "found detector array at node " & detnode %i7bkdcwk @yBg)1AL srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 %J*z!Fe8s ;#3l&HRKH1 Print "found differential detector area at node " & srcnode *O>OHX ogcEv>0 GetTrimVolume detnode, trm `$IuN* detx = trm.xSemiApe JGP<'6"L$ dety = trm.ySemiApe &WSxg&YG)\ area = 4 * detx * dety zJp}JO Print "detector array semiaperture dimensions are " & detx & " by " & dety W`baD!* Print "sampling is " & nx & " by " & ny hXsd12 %/l9$>{ 'reset differential detector area dimensions to be consistent with sampling }gk37_}X\I pixelx = 2 * detx / nx 6mP
s;I pixely = 2 * dety / ny jOJ$QT SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False 4!'1o`8vs Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 UL81x72O _l?InNv 'reset the source power e:SBX/\j SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) KeU|E<|! Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" 7
Jxhn! AlW0GK=N-p 'zero out irradiance array W6.
)7Y, For i = 0 To ny - 1 _:hrm%^ For j = 0 To nx - 1 . ZuRH_pI irrad(i,j) = 0.0 vwVK^B Next j C-
Aiv@@<= Next i Fai_v{&? 8dg\_H_ 'main loop z6~cm6 j EnableTextPrinting( False ) ^[K3]*!@ 6S#Y$2
P ypos = dety + pixely / 2 /}G+PUk7 For i = 0 To ny - 1 ^
olaq(z xpos = -detx - pixelx / 2 OE{{,HFa`G ypos = ypos - pixely z/IA
@ XLEEd?Vct9 EnableTextPrinting( True ) ~r<@`[-L Print i cL31g_u EnableTextPrinting( False ) R+'$V$g\X k[TVu5R VMry$ For j = 0 To nx - 1 )
>_xHc ? XILB>o.^3 xpos = xpos + pixelx ~vqVASUc, zV)(i<Q 'shift source b2}>{Li0 LockOperationUpdates srcnode, True
q|An GetOperation srcnode, 1, op &h(>jY7b; op.val1 = xpos L-B"P& op.val2 = ypos =?o, ' n0 SetOperation srcnode, 1, op P$YY4|` LockOperationUpdates srcnode, False :O`7kZ]=n Y(aEp_kV raytrace 20 <$f DeleteRays 4(
Q_J4}P CreateSource srcnode IM.sW'E TraceExisting 'draw eWKFs)C] {{hp;&x 'radiometry
HaJs)j For k = 0 To GetEntityCount()-1 o!R.QI^2VT If IsSurface( k ) Then 4?+K:e #F temp = AuxDataGetData( k, "temperature" ) 12 8aJ emiss = AuxDataGetData( k, "emissivity" ) cB$OkaG# If ( temp <> 0 And emiss <> 0 ) Then ] !7%) ProjSolidAngleByPi = GetSurfIncidentPower( k ) }ufzlHD frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) /_WAF90R? irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi w}8
,ICL End If AcZ{B< kJQH{n+)R End If r]h>Bb OQlmzg Next k $|kq{@< #Hn<4g"AjM Next j -cgLEl1 J mLEJt,X Next i l#%qF Db EnableTextPrinting( True ) 0bG[pp$[ uDtml$9rN 'write out file b 7XTOB_HO fullfilepath = CurDir() & "\" & fname %G'{G Open fullfilepath For Output As #1 m:6^yfS Print #1, "GRID " & nx & " " & ny Mi>! Print #1, "1e+308" ae%Bl[ Print #1, pixelx & " " & pixely a&^HvXO(>( Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 BlLK6"gJT ,9A1p06 maxRow = nx - 1 ^sF/-/ {?U maxCol = ny - 1 B$ =oU For rowNum = 0 To maxRow ' begin loop over rows (constant X) m|')
A row = "" ]\~s83?X For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) *F<Ar\f5 row = row & irrad(colNum,rowNum) & " " ' append column data to row string #EG
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f Next colNum ' end loop over columns :P2{^0$ 5T*Uq>x0 Print #1, row ftb .CPWI CXQ +h Next rowNum ' end loop over rows Ci-CY/]s Close #1 Vn=K5nm mNII-XG Print "File written: " & fullfilepath VQ R
E] Print "All done!!" XRl!~Y| End Sub ,`pUz[wl R|@?6< 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: +g9CklJ N9dx^+\ .4[\%r\i 找到Tools工具,点击Open plot files in 3D chart并找到该文件 @u>:(9bp e,?qwZK:y
vE~>9 打开后,选择二维平面图: 3>T2k } r"_U-w
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