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摘要: 3,?LpdTS 4W#DLip9 RPC Photonics公司有高品质的的工程漫射体BSDF测试数据,但它对于FRED帮助甚少,下面这个步骤描述了如何利用FRED脚本转换RPC Photonics提供的TXT文件,并将数据直接应用到FRED的Tabulated scatter 散射模型。 0<93i {krBAz& 背景: {2 k]$| Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术,可以解决其他技术的不足,大大改善了诸如光刻系统、有效固态照明,显示,背光,显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体(Engineered DiffusersTM)的新概念,与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同,工程漫射体要求对于每个散射中心,通常为微透镜单元,都进行控制。例如全息漫射体可以视为一组随机排列的透镜,但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制:而无法单独操控每个微透镜单元,这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面,在工程漫射体中,每个微透镜单元形成漫射体,由其凹形纵断面和在阵列中的位置所确定。同时,为了确保漫射体不受输入光束变化的影响,并且不产生衍射效果,微透镜单元的分布是随机的,根据产生相应的光束形状函数所选取的概率分布函数来确定。因此,工程漫射体同时保留了随机与确定性漫射体的优点,从而实现高性能的光束整形功能。 ^?NLA&v< FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 RM;Uq>l 图1. RPC Photonics工程漫射体结构及光束投射形状 P$Q,t2$A }N&?8s= vXm'ARj
步骤 G*_qqb{B 60 %VG 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 }U ' C1>zwU_zo 图2. RPC Photonics工程漫射体不同类型的散射数据 Q5lt[2Zyzd 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) q@g#DP+C 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 /DjsnU~3 例如下所示: )-0+O=v Sample name: EDF-C1-56 8@Bm2?$}g Merging data from file EDF-C1-56 0-0.txt "
sC]z} Finished merging RPC data for sample EDF-C1-56 C]Y%dQh+a FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt yf7|/M 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 l(W?]{C[% a. 创建一个新的散射库 K|Eelhm b. 散射模型命名 IXG@$O?y/ c. 改变散射模型为“Tabulated BSDF”. 5|cRHM# d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) _xmQGX!| e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 $6(a6! f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, UVXSW*$ g. 点击OK IEfYg(c0U 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 #^BttI 5KP\ #Y S'\e"w 脚本代码: ltlo$`PR `5e{ec
c7 '#Language "WWB-COM" YUHiD* w51l;2$des Option Explicit wqi0%Cu* 7377g'jL Sub Main R$+p4@?S jZC[_p; 'Cleanup >JAWcT)d ClearOutputWindow() vw4b@v-XQ3 ^`B;SSV Print "Merging RPC Photonics BSDF Data Files" e`:^7$ SetTextColor(255,0,0) T:@7EL Print "Note: Script should be located in the same folder as the BSDF TXT files." ]-9w'K d Print "Note: Do not run this script multiple times without deleting the output file between executions." .rITzwgB SetTextColor(0,0,0) M9""(`U hO&_VCk 'Current directory of this script (should be the same as the text files being merged) \A,zwdt
P Dim cDir As String /&<V5?1| cDir = MacroDir$ & "\" lZuH:AH TQmrL 'Array which will be populated with the list of files to be merged m[KmXPFht1 Dim fList() As String, curFile As String % P Ex GetFileList( cDir, fList ) %1$#fxR 7~F~ 'V Print "" E3l*_b0 Print "Files found for merging:" IRwtM'%0 For Each curFile In fList =JW-EQ6[T Print Chr(9) & curFile d$n31F Next
)UM^#<- 5A*&!1T 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. 8Y.9%@ Dim nameArray() As String, sampName As String 2aX*|DGpw nameArray = Split(fList(0)," 0-0.txt") yi*EobP sampName = nameArray(0) -fl6M-CYX Print "" ~bCA8 Print "Sample name: " & Chr(9) & sampName %T\hL\L? }{VOy PG 'Open an output file and write the FRED header data D4,>g )B Dim outFile As String kaXq. outFile = cDir & sampName & "_FRED.txt" QF\nf_X Open outFile For Output As #1 q[C?1Kc.z Print #1, "type bsdf_data" &e@)yVLL Print #1, "format angles=deg bsdf=value scale=1" AB`.K{h 9aY8`B 'Loop the file list, skip the two header lines and write the remaining data to file (/N&_r4x Dim lineArray() As String, curLine As Long RG""/x; For Each curFile In fList IlB8~{p_ Print "Merging data from file " & curFile 9i}$245lB ReadFile( cDir & curFile, lineArray ) (nt`8 0 For curLine = 2 To UBound(lineArray) 4$[o; t> Print #1, lineArray(curLine) {\(MMTQ Next $q)YC.5$ Next z&tC5]# sHc-xnd 'Close the output file xBA"w:< Close #1 ~cCMLK em G:":CX"O( Print "Finished merging RPC data for sample " & sampName LCH\;07V# Print "FRED formatted data file: " & Chr(9) & outFile z'_Fg0kR{ End Sub dY S(}U ,
:#bo]3 'Utility function to read the contents of a file into an array of strings. xBVOIc[4( Function ReadFile(ByVal fileName As String, _ |cf-S8pwY ByRef lineArray() As String) As Long )6C+0b* $TXxhd 6 ReadFile = -1 p>`rTaeZg Dim oFSO As Object () _RLA Set oFSO = CreateObject("Scripting.FileSystemObject") hr
fF1
>A Erase lineArray J8alqs7 j#n ]q{s4 Dim fid As Long P3&s<mh If oFSO.fileexists( fileName ) Then Yt]`>C[|D fid = FreeFile() nc k/Dw Open fileName For Input As fid M?eP1v:<+G lineArray = Split(Input(LOF(fid), fid), vbCrLf) PN
l/}' Close fid AygdAg'\ End If ]`&_!T Set oFSO = Nothing })/P[^ Return UBound( lineArray ) 5qtk#FB .[O{,r End Function a|7C6#iz$ \34vE@V* Sub GetFileList( ByVal in_dir As String, _ Jw;~ $ ByRef in_flist() As String ) 5E'/8xp bB 2X@9o4_4q 'Redimension the file list array F]
c\Qt Erase in_flist 'v6@5t19j @Z~YFnEJi 'Tracks how many files are found jq,M1 Dim fCount As Long f8:nKb>nq$ fCount = 0 PXMd=,} }
{1IB 'Recurse directory and search for text files }HoCfiE=X Dim f As String YhN<vZ}U!~ f = Dir$(in_dir & "*.txt") F06o-xH= While f <> "" W@T\i2r$z ReDim Preserve in_flist(fCount) c;VqEpsbl in_flist(fCount) = f l)%PvLbL fCount += 1 n~I-mR)" f = Dir$() dR S:S_ Wend PILpWhjL$9 ReDim Preserve in_flist(fCount-1) "v1{ $tmdE)"& End Sub keAoJeG,J
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