v0r:qku 摘要: u9;3Xn8 jGLmgJG-P 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。 Rq15AR =0e>'Iw2 背景: tDAX
pi( 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。 o< b 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。图1. RPC Photonics工程漫射体结构及光束投射形状 nILUo2e~ f$ /C.E :V8oWMY v*excl~ 步骤 2;:]Q.g uYTyR;a 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。 G]l/L\{ 图2. RPC Photonics工程漫射体不同类型的散射数据 bIt{kzuQC :qXREF@h 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) P,S!Z&! 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 !6.LSY,E 例如下所示: O0^Y1l Sample name: EDF-C1-56 H{P*d=9v Merging data from file EDF-C1-56 0-0.txt &}gH!5L m Finished merging RPC data for sample EDF-C1-56 fpNq FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt '(ETXQ@ 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 [e=k<gKH a. 创建一个新的散射库 l7ES*==&@0 b. 散射模型命名 Uwiy@T Z c. 改变散射模型为“Tabulated BSDF”. %Y`)ZKh
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 ) *[nS*D\: 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。 :@~3wD[y 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, -}qay@cDt g. 点击OK mznE Cy 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 o)
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s 脚本代码: w2"]%WS % 4>=Y@z '#Language "WWB-COM" n-9X<t|*?a }L Brk0] Option Explicit -J!k|GK#MX #z}IW(u< Sub Main ({rescQB {flxZ} 'Cleanup ;f3))x ClearOutputWindow() $I@. <J* p'SY 2xq-, Print "Merging RPC Photonics BSDF Data Files" $>~4RXC SetTextColor(255,0,0) 9&c *%mm Print "Note: Script should be located in the same folder as the BSDF TXT files." Re\V<\$J Print "Note: Do not run this script multiple times without deleting the output file between executions." ]=^NTm, SetTextColor(0,0,0) )N
^g0L 4p u>f. 'Current directory of this script (should be the same as the text files being merged) <CP't[ Dim cDir As String ~o;*{ Q cDir = MacroDir$ & "\" l&Fx<
W e3&.RrA 'Array which will be populated with the list of files to be merged $/i;UUd Dim fList() As String, curFile As String ~f2-%~ GetFileList( cDir, fList ) vw
q Y;7 %}~Ncn_r Print "" vn5]+-I Print "Files found for merging:" X15e~;& For Each curFile In fList T8QRO%t Print Chr(9) & curFile FJ&?My,=J Next ErMA$UkJ c;7ekj 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. W^nG\"T^ Dim nameArray() As String, sampName As String 7+p=4i^@Zs nameArray = Split(fList(0)," 0-0.txt") QXT*O sampName = nameArray(0) V@>s]]HMq# Print "" R75np^ Print "Sample name: " & Chr(9) & sampName ,e>N9\* T*C]:=) 'Open an output file and write the FRED header data 2:S
4M.j Dim outFile As String n47v5.Wn outFile = cDir & sampName & "_FRED.txt" ?Da!QH
>,] Open outFile For Output As #1 szb],)|18 Print #1, "type bsdf_data" ~); 7D'[ Print #1, "format angles=deg bsdf=value scale=1" Pd<>E*>}c. F0 FF:>< 'Loop the file list, skip the two header lines and write the remaining data to file w+owx(mN@ Dim lineArray() As String, curLine As Long 5AT[1@H(_ For Each curFile In fList j1,ir Print "Merging data from file " & curFile <yrl_vl{ ReadFile( cDir & curFile, lineArray ) ?g'? Ou For curLine = 2 To UBound(lineArray) NvfQa6?; Print #1, lineArray(curLine) P\H$*6v( Next vvG#O[| O Next
O%kX=6 j kIgEF2d* 'Close the output file p[%FH? Close #1 f~? MNJ2 2^7VDqLc Print "Finished merging RPC data for sample " & sampName i/UHDqZ Print "FRED formatted data file: " & Chr(9) & outFile }%9A+w}o End Sub !_gHIJiq} FCEFg)c5= 'Utility function to read the contents of a file into an array of strings. =sW(2Im Function ReadFile(ByVal fileName As String, _ wGf SVA-q\ ByRef lineArray() As String) As Long uD''0G\ 3 tp'}v ReadFile = -1 3Ga!) Dim oFSO As Object 9q-9UC!g Set oFSO = CreateObject("Scripting.FileSystemObject") q G%'Lt Erase lineArray F|XRh 6j 1yN/+Rq Dim fid As Long >{^&;$G+* If oFSO.fileexists( fileName ) Then /K9Tn fid = FreeFile() ,$96bF "# Open fileName For Input As fid 58Fan*fO lineArray = Split(Input(LOF(fid), fid), vbCrLf) aD@sb o Close fid {\L /?# End If $>;U^- #3 Set oFSO = Nothing f6ad@2 Return UBound( lineArray ) 1/YWDxo, w#5^A(NR End Function G~I@'[ur qqSf17sW Sub GetFileList( ByVal in_dir As String, _ Y\len ByRef in_flist() As String ) N (W;(7 _kb
$S 'Redimension the file list array Bp`?inKBOd Erase in_flist K
-!YD}OF .j}dk.#h 'Tracks how many files are found Uzb~L_\Rmt Dim fCount As Long mh"&KX86W fCount = 0 G:QaWqUb d3#
>\QCD9 'Recurse directory and search for text files S3u>a\ Dim f As String DDT)l+: XP f = Dir$(in_dir & "*.txt") Q0I22? While f <> "" '@h5j6:2 ReDim Preserve in_flist(fCount) EC2KK)=n} in_flist(fCount) = f 2Ke?* fCount += 1 H\7Qf8s|{ f = Dir$() vJT
%ET Wend c@%:aiEl ReDim Preserve in_flist(fCount-1) |