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摘要: P-[6xu+] gO4`e(W 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。 ?%(8RQ \MQ|( 背景: 8.Wf^j$+{ 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。 W1M<6T.{7 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。 c&IIqT@Gb0 图1. RPC Photonics工程漫射体结构及光束投射形状 z#GZvB/z) Uaj8}7v u!?.vx<qy 步骤 vL{sk|2& BdB/`X* 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。 $S|bD$e Uaog_@2n, 图2. RPC Photonics工程漫射体不同类型的散射数据 3J~Q pw0< 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) &,2XrXiFu 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 HlgF%\@a+U 例如下所示: Hq"i0Xm Sample name: EDF-C1-56 "zJ1vIZY Merging data from file EDF-C1-56 0-0.txt 9a"[-B: Finished merging RPC data for sample EDF-C1-56 pJ"Wg@+ FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt 5Q,#Co 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 D`,W1Z# a. 创建一个新的散射库 QNJ )HNLp b. 散射模型命名 1om :SHw c. 改变散射模型为“Tabulated BSDF”. m^@,0\F 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 ) ,*%%BTnR 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。 F]@vmzr 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, :% )va g. 点击OK -("sp 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 \I1+J9Gl r ,D
T> p)RASIB 脚本代码: oOUL<ihe? 6MvjNbQ '#Language "WWB-COM" ,IF3VE&r CWdA8)n. Option Explicit q+5g+9 ob05:D_bc9 Sub Main <XiHQ
B! lt`(R*B% 'Cleanup gUwg\>UC ClearOutputWindow() wP8Wx~Q= !E8y!|7$ Print "Merging RPC Photonics BSDF Data Files" v8W .84e- SetTextColor(255,0,0) ;D&FZ|`(u Print "Note: Script should be located in the same folder as the BSDF TXT files." EE(1;]d- Print "Note: Do not run this script multiple times without deleting the output file between executions." 2'Cwx-_G` SetTextColor(0,0,0) <0g.<n, ozwPtF5 'Current directory of this script (should be the same as the text files being merged) A^nB!veh Dim cDir As String =v]\{. cDir = MacroDir$ & "\" 109dB$+$ F=!p7msRB 'Array which will be populated with the list of files to be merged }m0*w3 Dim fList() As String, curFile As String P~`gWGC} GetFileList( cDir, fList ) | s%--W S#_g/3w Print "" ad1 I2 Print "Files found for merging:" m1H_kJ For Each curFile In fList L|pMq!@J Print Chr(9) & curFile #N9^C@ Next W{:^P0l o|O730"2F 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. _rt+OzZ*L Dim nameArray() As String, sampName As String zrVw l\& nameArray = Split(fList(0)," 0-0.txt")
2%P{fJbwd sampName = nameArray(0) ^=`7]E [p Print "" +A%|.; Print "Sample name: " & Chr(9) & sampName &0cfTb)dG 5IE3[a%X 'Open an output file and write the FRED header data ?_)b[-N! Dim outFile As String /}A"F[5 outFile = cDir & sampName & "_FRED.txt" HO[W2b Open outFile For Output As #1 t 66Cx Print #1, "type bsdf_data" /iURP-rl Print #1, "format angles=deg bsdf=value scale=1" d1]CN6 7{G |2t
g3m@ 'Loop the file list, skip the two header lines and write the remaining data to file HR'sMu3 Dim lineArray() As String, curLine As Long " E+V>V+ For Each curFile In fList 5"5!\Zo Print "Merging data from file " & curFile /2z, ?,jL ReadFile( cDir & curFile, lineArray ) =2v/f_ For curLine = 2 To UBound(lineArray) j"=F\S&! Print #1, lineArray(curLine) kq|(t{@Rp Next @'n075)h Next @A32|p} jHjap:i`cI 'Close the output file =D-u".{ Close #1 wT\JA4 3
UUOB. Print "Finished merging RPC data for sample " & sampName 0PEg
`Wq Print "FRED formatted data file: " & Chr(9) & outFile $O
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^ End Sub -YvnX0j+ PgOOFRwP 'Utility function to read the contents of a file into an array of strings. {BV0Y.O Function ReadFile(ByVal fileName As String, _ 5<64 C}fE3 ByRef lineArray() As String) As Long RTC;Wj 7m.#No>^ ReadFile = -1 JR6r3W Dim oFSO As Object 709/'#- ^ Set oFSO = CreateObject("Scripting.FileSystemObject") g{ () Erase lineArray )+GwYt )LC"rSNx% Dim fid As Long _43'W{% If oFSO.fileexists( fileName ) Then P^'TI[\L9 fid = FreeFile() 'Fq+\J#% Open fileName For Input As fid $'*q]] lineArray = Split(Input(LOF(fid), fid), vbCrLf) jxc^OsYj Close fid L5[{taZ, End If ?iXN..6x Set oFSO = Nothing KBC?SxJSJc Return UBound( lineArray ) Gxh r0' sdp3geBYo End Function !d.bCE~ [?>\] Sub GetFileList( ByVal in_dir As String, _ W6c]a/ ByRef in_flist() As String ) X!xmto S:(YZ%# 'Redimension the file list array vKO/hZBh Erase in_flist X+2uM+ OsT|MX 'Tracks how many files are found c-VIp A1 Dim fCount As Long }INj~d<: fCount = 0 !jWE^@P/B )4#YS$B$@) 'Recurse directory and search for text files )L/0X40<. Dim f As String LWdA3% f = Dir$(in_dir & "*.txt") WAt= T3 While f <> "" ]?G|:Kx$y% ReDim Preserve in_flist(fCount) Ce/l[v in_flist(fCount) = f q0C%">>1# fCount += 1 rnyXMt.q f = Dir$() *^oL$_Y Wend Q}9!aB, ReDim Preserve in_flist(fCount-1) oRZ98?Y\B
:%-w/QwTR End Sub fc&djd`FuX baoyU#X9 (kTu6t* QQ:2987619807 5pT8 }?7
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