RPC Photonics扩散片BSDF

J|xXo    RPC Photonics扩散片BSDF

时间:2016-01-08 23:10来源:讯技光电作者: 技术部点击:次打印

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。 Rq15AR   =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) eW5s,6   Wi)N/^;n   Wbmqf s   脚本代码： w2"]%WS%   4>=Y@z   '#Language "WWB-COM" n-9X<t|*?a   }LBrk0]   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" $>~4RXC       SetTextColor(255,0,0) 9&c *%mm       Print "Note: Script should be located in the same folder as the BSDF TXT files." Re\V<\$J       Print "Note: Do not run this script multiple times without deleting the output file between executions." ]=^NTm,       SetTextColor(0,0,0) )N ^g0L   4pu>f.       'Current directory of this script (should be the same as the text files being merged) <CP't[       Dim cDir As String ~o;*{ Q       cDir = MacroDir$ & "\" l&Fx< W   e3&.RrA       'Array which will be populated with the list of files to be merged $/i;UUd       Dim fList() As String, curFile As String ~f2-%~       GetFileList( cDir, fList ) vw q Y;7   %}~Ncn_r       Print "" vn 5]+-I       Print "Files found for merging:" X15e~;&       For Each curFile In fList T8QRO%t           Print Chr(9) & curFile FJ&?My,=J       Next ErMA$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 szb],)|18       Print #1, "type bsdf_data" ~); 7D'[       Print #1, "format angles=deg bsdf=value scale=1" Pd<>E*>}c.   F0FF:><       '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) N vfQa6?;               Print #1, lineArray(curLine) P\H$*6v(           Next vvG#O[ | O       Next O%kX=6   jkIgEF2d*       'Close the output file p[%FH?       Close #1 f~? MNJ2   2^7VDqLc       Print "Finished merging RPC data for sample " & sampName i/UHDqZ       Print "FRED formatted data file: " & Chr(9) & outFile }%9A+w}o   End Sub !_gHIJiq}   FCEFg)c5=   'Utility function to read the contents of a file into an array of strings. =sW(2Im   Function ReadFile(ByVal fileName As String, _ wGf SVA-q\                     ByRef lineArray() As String) As Long uD''0G \   3 tp'}v       ReadFile = -1 3Ga!)       Dim oFSO As Object 9q-9UC!g       Set oFSO = CreateObject("Scripting.FileSystemObject") qG%'Lt       Erase lineArray F|XRh6j   1yN/+Rq       Dim fid As Long >{^&;$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 <> "" '@h 5j6:2           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)