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摘要: zYY$D. ^|!I+ RPC Photonics公司有高品质的的工程漫射体BSDF测试数据,但它对于FRED帮助甚少,下面这个步骤描述了如何利用FRED脚本转换RPC Photonics提供的TXT文件,并将数据直接应用到FRED的Tabulated scatter 散射模型。 C?4JXW V 9wI\0 背景: %+)o'nf"U Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术,可以解决其他技术的不足,大大改善了诸如光刻系统、有效固态照明,显示,背光,显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体(Engineered DiffusersTM)的新概念,与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同,工程漫射体要求对于每个散射中心,通常为微透镜单元,都进行控制。例如全息漫射体可以视为一组随机排列的透镜,但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制:而无法单独操控每个微透镜单元,这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面,在工程漫射体中,每个微透镜单元形成漫射体,由其凹形纵断面和在阵列中的位置所确定。同时,为了确保漫射体不受输入光束变化的影响,并且不产生衍射效果,微透镜单元的分布是随机的,根据产生相应的光束形状函数所选取的概率分布函数来确定。因此,工程漫射体同时保留了随机与确定性漫射体的优点,从而实现高性能的光束整形功能。 (1R?s>3o FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 h#r^teui) 图1. RPC Photonics工程漫射体结构及光束投射形状 *?ITns W< nmU_N:Y a:,y
Z 步骤 fvq,,@23 P>ceeoYQuA 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 Q/ms]Du oR1^/e 图2. RPC Photonics工程漫射体不同类型的散射数据 x%+{VStA 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) epHJ@ W@# 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 y&m0Lz53Z 例如下所示: %xZG*2vc!B Sample name: EDF-C1-56 WE6a' Merging data from file EDF-C1-56 0-0.txt #oeG!<Mn Finished merging RPC data for sample EDF-C1-56 JA)?p{j FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt *OJ/V O 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 h%; e0Xz| a. 创建一个新的散射库 <h).fX b. 散射模型命名 [#Lc]$ c. 改变散射模型为“Tabulated BSDF”. \c v?^AI 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 ) 6lwta`2 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。 'ly?P8h 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, vbx6I>\Y g. 点击OK 7?8wyk|x 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 "xmP6=1 :2
>hoAJJ u%/fx~t$ 脚本代码: acP+3u?r \0l>q , '#Language "WWB-COM" `1*nL,i n% 'tKU\q Option Explicit =gfI!w Ho DVn/lr Sub Main uwf
5!Z:> n+@F`]Ke 'Cleanup fj7|D'c ClearOutputWindow() Pg9hW Oa;X+ Print "Merging RPC Photonics BSDF Data Files" O%g$9-?F0 SetTextColor(255,0,0) ^D^4
YJz Print "Note: Script should be located in the same folder as the BSDF TXT files." %*aJLn+]_R Print "Note: Do not run this script multiple times without deleting the output file between executions." b*a2,MiM SetTextColor(0,0,0) S##1GOO !Fo*e 'Current directory of this script (should be the same as the text files being merged) iv`O/T Dim cDir As String ;6@r-r cDir = MacroDir$ & "\" WW+l' 6. "mL++>ZSQ 'Array which will be populated with the list of files to be merged 2!&&|Mh} Dim fList() As String, curFile As String HEL!GC># GetFileList( cDir, fList ) t}IkK=f Uv
YF[@ Print "" ~\x:<) Print "Files found for merging:" ;.xoN|Per For Each curFile In fList .=m,hu~ Print Chr(9) & curFile /bj
<Ft\ Next lis/`B\x H&r,FmI@ 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. 3lV^B[$ Dim nameArray() As String, sampName As String +`7KSwa nameArray = Split(fList(0)," 0-0.txt") EbeI{-'aF sampName = nameArray(0) K{n{KB&_& Print "" -a*K$rnB Print "Sample name: " & Chr(9) & sampName @
'@:sM_ ]yjl~3 'Open an output file and write the FRED header data syU9O&< Dim outFile As String m}>F<;hQ outFile = cDir & sampName & "_FRED.txt" {`2R,Jb%S Open outFile For Output As #1 cvwhSdZu8 Print #1, "type bsdf_data" LIg{J% Print #1, "format angles=deg bsdf=value scale=1" #%J5\+ua
h:lt<y 'Loop the file list, skip the two header lines and write the remaining data to file Oj<S.fi Dim lineArray() As String, curLine As Long 2[0JO.K
4 For Each curFile In fList iU6Gp-<M, Print "Merging data from file " & curFile |ZodlYF ReadFile( cDir & curFile, lineArray ) BpX6aAx For curLine = 2 To UBound(lineArray) >~`C-K# Print #1, lineArray(curLine) ,=?{("+ Next XqM3<~$ Next 2pdvWWh3l u?sVcD[ 'Close the output file r`c_e)STO Close #1 R/"x}B1d + [Hh,I7 Print "Finished merging RPC data for sample " & sampName n$xQ[4eH) Print "FRED formatted data file: " & Chr(9) & outFile 6<K6Y5<6 End Sub 52upoU>}2 CK,
6ytB 'Utility function to read the contents of a file into an array of strings. ~4q5
k5., Function ReadFile(ByVal fileName As String, _ P{Q=mEQ ByRef lineArray() As String) As Long rJ KZ)N{ UT}i0I9 ReadFile = -1 ~ %B<
Dim oFSO As Object `9k0Gd Set oFSO = CreateObject("Scripting.FileSystemObject") "UwH\T4I Erase lineArray 5k|9gICyd* ?5kHa_^ Dim fid As Long 5>AX*]c If oFSO.fileexists( fileName ) Then fwzb!"!.@ fid = FreeFile() Y.^=]-n, Open fileName For Input As fid L@JOGCYy lineArray = Split(Input(LOF(fid), fid), vbCrLf) Qp`gswvE Close fid g/13~UM\ End If &@ JvnO: Set oFSO = Nothing []s^
Return UBound( lineArray ) >
xIJE2 %LYnxo7#C End Function 0a"igq9t 02BuX]_0g Sub GetFileList( ByVal in_dir As String, _ wf1lyS ByRef in_flist() As String ) %X9r_Hx a~8[<F omj 'Redimension the file list array y\{%\ $ Erase in_flist xeGb?DPu @3kKJ 'Tracks how many files are found IKie1!ZU{" Dim fCount As Long F[ewn/]n fCount = 0 %,ngRYxT# -GLMmZJt 'Recurse directory and search for text files Ali9pvE Dim f As String q\H[am f = Dir$(in_dir & "*.txt") i1RiGS While f <> "" ws^4?O ReDim Preserve in_flist(fCount) "fq{Y~F%` in_flist(fCount) = f ZcYh) HD fCount += 1 mS0udHod f = Dir$() Ie%EH Wend 7=(Hy\Q5xH ReDim Preserve in_flist(fCount-1) F5o+kz$; " LJq%E End Sub GRY2?'` LY+|[qka >3&O::]3 QQ:2987619807 "O(9 m.CZ
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