首页 -> 登录 -> 注册 -> 回复主题 -> 发表主题
光行天下 -> 讯技光电&黉论教育 -> 十字元件热成像分析 [点此返回论坛查看本帖完整版本] [打印本页]

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。 : fYfXm  
ts@$*  
成像示意图
qk3 ~]</  
首先我们建立十字元件命名为Target Q#ksf h!D  
-UzWLVB^  
创建方法: z2,NWmP|w  
StTxga|  
面1 : Je9Z:s[  
面型:plane 1pDU}rPJ.  
材料:Air 1EQ:@1  
孔径:X=1.5, Y=6,Z=0.075,形状选择Box y $uq`FW  
fSVM[  
PX&}g-M9  
辅助数据: Rc4=zimr+  
首先在第一行输入temperature :300K, d#bg(y\G|  
emissivity:0.1; A=|a!N/  
G"u4]!$/  
+N+117m  
面2 : [qkW/qS  
面型:plane g5Io=e@s  
材料:Air <6+B;brh  
孔径:X=1.5, Y=6,Z=0.075,形状选择Box V3VTbgF  
]|w~{X!b4  
%_p]6doF  
位置坐标:绕Z轴旋转90度, lnjs{`^  
tq'hiS(b  
[] "bn9 +  
辅助数据: Wrp+B[ {r\  
T>#~.4A0  
首先在第一行输入temperature :300K,emissivity: 0.1; *,O3@,+>H  
<GQ=PrT|/  
$qZ6i  
Target 元件距离坐标原点-161mm; ZK'WKC  
OT|0_d?bD  
)*uotV  
单透镜参数设定:F=100, bend=0, 位置位于坐标原点 [U^Cz{G  
MzKl=G  
l"X,[  
探测器参数设定: z+wegF  
Ic!x y  
在菜单栏中选择Create/Element Primitive /plane \?8q&o1=]  
tIod=a)  
8JR&s  
k6z]"[yu  
DyZ6&*s$  
W)  
元件半径为20mm*20,mm,距离坐标原点200mm。 .Sa=VC?EZ  
?g@X+!RB  
光源创建: /.A"HGAk  
,`a8@  
光源类型选择为任意平面,光源半角设定为15度。 |<oqT+?i  
2dJE` XL  
jll|y0  
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。 z`\KQx  
KX cRm)  
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。 x*TJYST  
ObreDv^,  
|90/tNe  
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。 En&gI`3n  
7o!t/WEEq  
创建分析面: xy&*s\=:  
3tUn?; 9B  
<)sL8G9Y  
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。 ^vxNS[C`;  
e(b$LUV  
+eLL)uk  
到此,所有的光学结构和属性设定完成,通过光线追迹我们可以查看光线是否可以穿过元件。 j*f\Z!EeZ  
r[7*1'. p  
FRED在探测器上穿过多个像素点迭代来创建热图 P;'ZdZ(SLu  
y )<+?@sP  
FRED具有一个内置的可编译的Basic脚本语言。从Visual Basic脚本语言里,几乎所有用户图形界面(GUI)命令是可用这里的。FRED同样具有自动的客户端和服务器能力,它可以被调用和并调用其他可启动程序,如Excel。因此可以在探测器像素点上定义多个离轴光源,及在FRED Basic脚本语言里的For Next loops语句沿着探测器像素点向上和向下扫描来反向追迹光线,这样可以使用三维图表查看器(Tools/Open plot files in 3D chart)调用和查看数据。 itiSZL,  
将如下的代码放置在树形文件夹 Embedded Scripts, _;S~nn  
fN<Y3^i"  
)_o^d>$da  
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。 fF9hL3h?)  
-G_3B(]`  
绿色字体为说明文字, Y;g\ @j  
F1M:"-bda  
'#Language "WWB-COM" l4iklg3  
'script for calculating thermal image map 8$ X3J[_j  
'edited rnp 4 november 2005 :+ 1Wmg  
`@:TS)6X0  
'declarations 2!b##`UjA7  
Dim op As T_OPERATION N Mx:Jh-YN  
Dim trm As T_TRIMVOLUME eC6wrpZO  
Dim irrad(32,32) As Double 'make consistent with sampling I};*O6D`  
Dim temp As Double +/M%%:>mY  
Dim emiss As Double #@1(  
Dim fname As String, fullfilepath As String u'DpZ  
_nX8f &  
'Option Explicit V(io!8,  
&=:3/;c  
Sub Main 37jrWe6xwp  
    'USER INPUTS Vu E$-)&)  
    nx = 31 uAoZ&8D6  
    ny = 31 <viC~=k;  
    numRays = 1000 ]-SJ";aU  
    minWave = 7    'microns tAY{+N]f  
    maxWave = 11   'microns _bgv +/  
    sigma = 5.67e-14 'watts/mm^2/deg k^4 J ^<uo (  
    fname = "teapotimage.dat" <Kl$ek8  
%@TC- xx  
    Print "" dq'f >S z}  
    Print "THERMAL IMAGE CALCULATION" i*!2n1c[  
|pq9i)e&  
    detnode = FindFullName( "Geometry.Detector.Surface" ) '找到探测器平面节点 /Ah&d@b  
N&Ho$,2s  
    Print "found detector array at node " & detnode /s=veiH  
v#X#F9C  
    srcnode = FindFullName( "Optical Sources.Source 1" ) '找到光源节点 5)hfI7{d  
}owl7G3  
    Print "found differential detector area at node " & srcnode MQ0r ln?  
CHD.b%_|  
    GetTrimVolume detnode, trm _G25$%/LU  
    detx = trm.xSemiApe r}D#(G$  
    dety = trm.ySemiApe 6Q_A-X3hk  
    area = 4 * detx * dety apfr>L3  
    Print "detector array semiaperture dimensions are " & detx & " by " & dety n%4/@M  
    Print "sampling is " & nx & " by " & ny $p$p C/:%  
?~yJ7~3TS<  
    'reset differential detector area dimensions to be consistent with sampling <l5m\A  
    pixelx = 2 * detx / nx &%t&[Se_~  
    pixely = 2 * dety / ny Nv6"c<(L=  
    SetSourcePosGridRandom srcnode, pixelx / 2, pixely / 2, numRays, False MHye!T6fO\  
    Print "resetting source dimensions to " & pixelx / 2 & " by " & pixely / 2 u3pFH(  
HSAr6h  
    'reset the source power g0B%3v  
    SetSourcePower( srcnode, Sin(DegToRad(15))^2 ) rK:cUW0]X  
    Print "resetting the source power to " & GetSourcePower( srcnode ) & " units" r`h".=oD  
1)z Xv  
    'zero out irradiance array *yjnC  
    For i = 0 To ny - 1 ={N1j<%fh  
        For j = 0 To nx - 1 g]`YI5  
            irrad(i,j) = 0.0 # h4FLF_w  
        Next j P~iZae  
    Next i n&?)gKL0g  
ZrZDyXL  
    'main loop &oy')\H  
    EnableTextPrinting( False ) K{"hf:k  
)4c?BCgy  
    ypos =  dety + pixely / 2 fBv: TC%  
    For i = 0 To ny - 1 CA5`uh  
        xpos = -detx - pixelx / 2 mdEl CC0  
        ypos = ypos - pixely PiCGZybCA  
uLPBl~Y  
        EnableTextPrinting( True ) af9KtX+  
        Print i lI.oyR'  
        EnableTextPrinting( False ) FOMJRq  
c-n/E. E  
cY kb3(  
        For j = 0 To nx - 1 M6Np!0G  
nbf/WOCk  
            xpos = xpos + pixelx 8"ZS|^#  
\hBzP^*"n  
            'shift source rKyulgP  
            LockOperationUpdates srcnode, True JPng !tvR  
            GetOperation srcnode, 1, op p:W]  
            op.val1 = xpos ,c{ckm  
            op.val2 = ypos bcpsjUiy#  
            SetOperation srcnode, 1, op }*xjO/Ey  
            LockOperationUpdates srcnode, False $uyx  
@7C.0>W_A  
raytrace C])s'XTs  
            DeleteRays UOl*wvy  
            CreateSource srcnode @DY"~c cH  
            TraceExisting 'draw 1 ptyiy  
[(5.?  
            'radiometry cBZEyy&  
            For k = 0 To GetEntityCount()-1 y1Z>{SDiq  
                If IsSurface( k ) Then {+E]c:{  
                    temp = AuxDataGetData( k, "temperature" ) Ef28  
                    emiss = AuxDataGetData( k, "emissivity" ) g,]m8%GHE  
                    If ( temp <> 0 And emiss <> 0 ) Then PoPR34] ^J  
                        ProjSolidAngleByPi = GetSurfIncidentPower( k ) 3,6f}:CG  
                        frac = BlackBodyFractionalEnergy ( minWave, maxWave, temp ) 9q_{_%G%  
                        irrad(i,j) = irrad(i,j) + frac * emiss * sigma * temp^4 * ProjSolidAngleByPi q` IY;"~  
                    End If qIsf!1I?  
mTxqcQc:7  
                End If [YHtBM:y  
,p#B5Dif/  
            Next k rqqd} kA  
F4= =a8  
        Next j W0~G`A(:;  
Y7r;}^+WY  
    Next i NjOUe?BQ  
    EnableTextPrinting( True ) jHn7H)F8  
2%`= LGQC  
    'write out file oeZuvPCl  
    fullfilepath = CurDir() & "\" & fname ?Y,^Moc:  
    Open fullfilepath For Output As #1 OoH-E.lp  
    Print #1, "GRID " & nx & " " & ny }^&f {   
    Print #1, "1e+308" tzIP4CR~F&  
    Print #1, pixelx & " " & pixely ?{^_z_,  
    Print #1, -detx+pixelx/2 & " " & -dety+pixely/2  ID,_0b  
E1OrL.A6  
    maxRow = nx - 1 P@vUQ  
    maxCol = ny - 1 BO G.[?yx  
    For rowNum = 0 To maxRow                    ' begin loop over rows (constant X) % _E?3  
            row = "" prz COw  
        For colNum = maxCol To 0 Step -1            ' begin loop over columns (constant Y) -8Mb~Hfl0  
            row = row & irrad(colNum,rowNum) & " "     ' append column data to row string U{M3QOF  
        Next colNum                     ' end loop over columns 1*dN. v:5  
%gAT\R_f  
            Print #1, row xwof[BnEZ  
W3/bM>1  
    Next rowNum                         ' end loop over rows :e;6oC*"q  
    Close #1 #YE?&5t  
Z,E$4Z  
    Print "File written: " & fullfilepath k/wD@H N  
    Print "All done!!" ,mp<<%{u  
End Sub 0ck3II  
~at@3j}W  
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: aPEI_P+Ls  
:#^qn|{e  
@GQfBV|3  
找到Tools工具,点击Open plot files in 3D chart并找到该文件 :1j8!R5  
  
/ta}12Z  
'%[ Y  
打开后,选择二维平面图: l X+~;94  
K%\r[NF  
查看本帖完整版本: [-- 十字元件热成像分析 --] [-- top --]

Copyright © 2005-2025 光行天下 蜀ICP备06003254号-1 网站统计