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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。 ^"7-`<J z"
tz-~ 成像示意图 he~8V.$ 首先我们建立十字元件命名为Target T^;b98* ?w(hPUd!2 创建方法: \C$e+qb~{
M ]047W 面1 : lPR^~&/ 面型:plane _b<;n|^ 材料:Air Z5TA4Q+Q 孔径:X=1.5, Y=6,Z=0.075,形状选择Box =u}~\ 'd {{G3^ysa t)j$lmQn 辅助数据: :jv(-RTI 首先在第一行输入temperature :300K, _OG9wi(Fpx emissivity:0.1; aUNA`
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Y\& LC]0c)v# 面2 : BeFyx"NBg 面型:plane J\@g3oGw 材料:Air bXJ(QXHd% 孔径:X=1.5, Y=6,Z=0.075,形状选择Box JL4E` bz>\n"' C')KZ|JIC 位置坐标:绕Z轴旋转90度, ?<jWEz= ((`\i=-o5 nam]eW 辅助数据: FNUs
.d" |9XoRGgXU 首先在第一行输入temperature :300K,emissivity: 0.1; m4~
|z Ee MKo 9]+zZP_# Target 元件距离坐标原点-161mm; <O=0 ^V Yr{hJGw[ tRI<K 单透镜参数设定:F=100, bend=0, 位置位于坐标原点 mTsyVji8 gOnZ# eV!(a8 探测器参数设定: 564L.^$@| 0V-jOc 在菜单栏中选择Create/Element Primitive /plane Khd A;bF
}&+,y<> {Y5@SIyE JYj*.Q0 )U|V |yem' H0&wn#);6R 元件半径为20mm*20,mm,距离坐标原点200mm。 GXm#\)
;@k=9o]A 光源创建:
kntY2FM BPv+gx(>k 光源类型选择为任意平面,光源半角设定为15度。 {HY3E}YJL ]h1.1@ >xc t0fgG/f' 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。 Q\s+w){f% c`x4."m 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。 w_>\Yd [ oUsfO-dET^ MR,I`9P e 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。 L/Kb\\f cQ<|Of 创建分析面: Zgh~7Z/ ma-GvWD2 UH0l8ixc 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。 @{RhO|UR @7"n X ;{0alhMZ 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。 JtY$AP$ sg-^ oy*^ FRED在探测器上穿过多个像素点迭代来创建热图 T^]]z}k >n/0od9 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。 ~Y
f8,m 将如下的代码放置在树形文件夹 Embedded Scripts, $k)K}U W=EcbH9/.) Tv'1IE 打开后清空里面的内容,此脚本为通用脚本适用于一切可热成像的应用。 3pML+Y|ij ;;i419 绿色字体为说明文字, c
nv%J}wq clyp0`,7 '#Language "WWB-COM" E>
pr})^w 'script for calculating thermal image map v+x rnz 'edited rnp 4 november 2005 `D=OEc 5"40{3 'declarations [4C_iaE Dim op As T_OPERATION HfH+U& Dim trm As T_TRIMVOLUME 4y}z+4 Dim irrad(32,32) As Double 'make consistent with sampling >0:3CpO* Dim temp As Double hj"JmF$m Dim emiss As Double @i'D)6sC Dim fname As String, fullfilepath As String `L$Av9X\ 0TV16-- 'Option Explicit 8IL5:7H8 [u*7( 4e Sub Main {?^ES*5 'USER INPUTS jTqJ(M}L nx = 31 X}
V]3 ny = 31 FZU1WBNL%t numRays = 1000 ~)$R'= minWave = 7 'microns Ff0V6j)ji maxWave = 11 'microns X ]&`"Z] sigma = 5.67e-14 'watts/mm^2/deg k^4 E`HA0/ fname = "teapotimage.dat" Am3j:|>* a}` M[%d7 Print "" ^y ', l Print "THERMAL IMAGE CALCULATION" _&q&ID .$d:c61X detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 jxW/"Q SF:{PgGMi Print "found detector array at node " & detnode MY\mo,# =;n>#< srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 OY|9V jX' pUO Print "found differential detector area at node " & srcnode ()8=U_BFz PDc4ok`) GetTrimVolume detnode, trm X`v6gv5qj detx = trm.xSemiApe :-+][ [ dety = trm.ySemiApe :T6zT3(")D area = 4 * detx * dety t3}_mJ Print "detector array semiaperture dimensions are " & detx & " by " & dety l0yflFGr Print "sampling is " & nx & " by " & ny yTbtS- [Z'4YXS 'reset differential detector area dimensions to be consistent with sampling aB G* pixelx = 2 * detx / nx 4E!Pxjl 3a pixely = 2 * dety / ny >d
.|I& SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False S=<
]u Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 nWYfe-zQxg v(O@~8(I 'reset the source power 4;Hm%20g SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) s#0m Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" 70*yx?T V `.VkR5/ 'zero out irradiance array uGlz|C For i = 0 To ny - 1 ]Zay9jD}c- For j = 0 To nx - 1 zYPvpZV/ irrad(i,j) = 0.0 7~MWp4. Next j DT;;4-{ Next i S)2 U oj [A!=Hv_$ 'main loop _fj@40i M EnableTextPrinting( False ) *"/BD=INv} (|6!pQ7 ypos = dety + pixely / 2 86&r;c: For i = 0 To ny - 1 {[H#lX 4 xpos = -detx - pixelx / 2 ;''S}; ypos = ypos - pixely I[ZWOi\-
; |~D~#Nz EnableTextPrinting( True ) blbzh';0} Print i /xA`VyHO EnableTextPrinting( False ) 6NFLk+kqN tnmz5Q 7V\M)r{q7 For j = 0 To nx - 1 \=W t{ 5oD%~Fk l xpos = xpos + pixelx -Xgup,}? kP~ ;dJD 'shift source #zd}xla0] LockOperationUpdates srcnode, True ,n5 [Y) GetOperation srcnode, 1, op %%O_:@9x, op.val1 = xpos Mr K?,7*Xi op.val2 = ypos +w3k_^X9c SetOperation srcnode, 1, op #>$w9}gFi LockOperationUpdates srcnode, False BxxqzN+ 5i3nz=~o raytrace V SH64 DeleteRays DGAg#jh CreateSource srcnode TU8K\;l] TraceExisting 'draw +qF,XJ2 P}p6{ 'radiometry f%d
=X>_ For k = 0 To GetEntityCount()-1 1\,wV, If IsSurface( k ) Then w\.z-6G temp = AuxDataGetData( k, "temperature" ) Y2p~chx9 emiss = AuxDataGetData( k, "emissivity" ) "l09Ae'V If ( temp <> 0 And emiss <> 0 ) Then OEN'c0;5 ProjSolidAngleByPi = GetSurfIncidentPower( k ) .3,Ow(3l frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) Vuo 8[h> irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi L@5g#mSl End If [SLBA_d _UeIzdV9 End If h@?BA<'S pe@/tO&I Next k h<2O+"^
?#;zB Next j {?'c|\n Li !g-19at Next i {~d8_%:b EnableTextPrinting( True ) o[eIwGxZ d5B96;3 'write out file nR~L$Wu5_a fullfilepath = CurDir() & "\" & fname G@n%P~ Open fullfilepath For Output As #1 W%7m3/d Print #1, "GRID " & nx & " " & ny [R[Suf Print #1, "1e+308" AJH-V
6 Print #1, pixelx & " " & pixely B\!.o=<h Print #1, -detx+pixelx/2 & " " & -dety+pixely/2 ?_c*(2i&^ ]hkway maxRow = nx - 1 *[_>d.i maxCol = ny - 1 eqE%ofW For rowNum = 0 To maxRow ' begin loop over rows (constant X) 5zBsu lRt row = "" f9 b=Zm' For colNum = maxCol To 0 Step -1 ' begin loop over columns (constant Y) vl}uHdeP9 row = row & irrad(colNum,rowNum) & " " ' append column data to row string mI~k@ !3 Next colNum ' end loop over columns mM7S9^<UH rj].bGQ,+ Print #1, row Q:B : q[SUYb;, Next rowNum ' end loop over rows N^.!l_ Close #1 xcYYo'U =w!14@W Print "File written: " & fullfilepath i;>Hy| Print "All done!!" "i1~YE End Sub IZ6[|Ach6 =2eG j'} 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: B/CP/Pfb ou@ P#:<B o5FBqt 找到Tools工具,点击Open plot files in 3D chart并找到该文件 WV"{oED DjjG?(1 GZ];U]_ 打开后,选择二维平面图: ?9801Da#/ Q
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