RPC Photonics扩散片BSDF

%1{S{FB   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

XO;_F"H=   摘要： E/H9 #   ()|e xWW   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。 YMw,C:a4   \l=A2i7TQ   背景： d[h=<?E5   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。 OFohyy(   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 7oE:]   3mo<O}}   mCnl@   A@3'I ;   步骤 J)g +I   y0 vo-Q   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。 d*TH$-F!p   图2. RPC Photonics工程漫射体不同类型的散射数据 `&=%p|   &DQ_qO KD   2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。（脚本代码放在了本文的最后） ]fY:+Ru   3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 7 :\J2$P   例如下所示： {v!w2p@   Sample name:  EDF-C1-56 %5L~&W}^"   Merging data from file EDF-C1-56 0-0.txt R UCUEo63   Finished merging RPC data for sample EDF-C1-56 lGet)/w;c   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt -wUT@a   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 xRZ K&vkKE   a. 创建一个新的散射库 tG]W!\C'h   b. 散射模型命名 xz`0V}dPl   c. 改变散射模型为“Tabulated BSDF”. #F/W_G7v   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 ） $m)eO8S+   e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 #}1yBxB<=   f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， y@}WxSK*0   g. 点击OK \HD:#a   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 #+i5'p(4   Nl4uQ_"   Z2;~{$&M+   脚本代码： JiqhCt\   VVF9X(^rQ   '#Language "WWB-COM" z>W?\[E<2   b 2\J<Nw   Option Explicit PYCG#U   2kgSIvk\   Sub Main "Ml#,kU<T   P/S,dhs(       'Cleanup :S`12*_g"       ClearOutputWindow() VaonG]Ues   O>*Vo!z\f       Print "Merging RPC Photonics BSDF Data Files" " SuG6!k3       SetTextColor(255,0,0) ga'G)d3oS       Print "Note: Script should be located in the same folder as the BSDF TXT files." .Z`xNp       Print "Note: Do not run this script multiple times without deleting the output file between executions." L{ej<0yr       SetTextColor(0,0,0) 7#HSe#0J   n1x3q/~       'Current directory of this script (should be the same as the text files being merged) i1{)\/f3       Dim cDir As String OZKZv,       cDir = MacroDir$ & "\" 8VpmcGvc3   ra ,.vJuT       'Array which will be populated with the list of files to be merged jJ RaY3       Dim fList() As String, curFile As String [IyC}lSW^-       GetFileList( cDir, fList ) cr18`xU   >TGc0 z+       Print "" [pt U}       Print "Files found for merging:" ZP:+'\&J       For Each curFile In fList 5rtE/{A           Print Chr(9) & curFile \^cXmyQ<%       Next V o%ikR #   +Lr`-</VF       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. v/7^v}[<       Dim nameArray() As String, sampName As String C szZr> Z       nameArray = Split(fList(0)," 0-0.txt") xgsEe3|       sampName  = nameArray(0) &?j\=%       Print "" &[|Z 2}       Print "Sample name: " & Chr(9) & sampName V\c`O   SJ, ];mC0       'Open an output file and write the FRED header data !h^_2IX       Dim outFile As String Yi`DRkp]3       outFile = cDir & sampName & "_FRED.txt" 9*s:Vff{       Open outFile For Output As #1 Qdy/KL1]       Print #1, "type bsdf_data" nGDY::nUE       Print #1, "format angles=deg bsdf=value scale=1" ]P_yN:~   ~A(^<       'Loop the file list, skip the two header lines and write the remaining data to file %4wHiCOg       Dim lineArray() As String, curLine As Long I,/E.cRV<       For Each curFile In fList +wGvYr           Print "Merging data from file " & curFile !%D;H~mQ           ReadFile( cDir & curFile, lineArray ) $}H,g}@0           For curLine = 2 To UBound(lineArray) Rx@0EPV               Print #1, lineArray(curLine) #A~7rH%hi           Next JGYJ;j{E]       Next !Ks<%; rb   GG4FS       'Close the output file B;<zA' 1       Close #1 H=XdgOui   u`*1OqU       Print "Finished merging RPC data for sample " & sampName HSACaTVK       Print "FRED formatted data file: " & Chr(9) & outFile d(vt0   End Sub 'kJyE9*xU.   0Fs2* FS   'Utility function to read the contents of a file into an array of strings. 1_mq PMm   Function ReadFile(ByVal fileName As String, _ ]0")iY_                     ByRef lineArray() As String) As Long 7Xh ;dJAF3   {P==6/<2o       ReadFile = -1 $b)k       Dim oFSO As Object i@=(Y~tD`       Set oFSO = CreateObject("Scripting.FileSystemObject") rwpH9\GE       Erase lineArray z|<?=c2P   BtF7P}:MGf       Dim fid As Long P(p|NRD@1       If oFSO.fileexists( fileName ) Then  ,}^FV~           fid = FreeFile() j9f QV           Open fileName For Input As fid 1/=6s5vS}           lineArray = Split(Input(LOF(fid), fid), vbCrLf) Jb|dpu/e           Close fid 5_rx$avm       End If k4JTc2b       Set oFSO = Nothing h\|T(597.       Return UBound( lineArray ) d-I&--"ju   Go7 oj'"   End Function G[zVGqk   iG{xDj{CKv   Sub GetFileList( ByVal in_dir As String, _ b}ODc]3                    ByRef in_flist() As String ) %\1W0%w   :>3?|Z"Aj       'Redimension the file list array }n k[WW       Erase in_flist T?*f}J   Bf$`Hf6       'Tracks how many files are found <SSkCw       Dim fCount As Long .6pVt_f0/       fCount = 0 v+DXs!O{   C|S~>4`       'Recurse directory and search for text files =AX"'q       Dim f As String S3y(' PeF       f = Dir$(in_dir & "*.txt") 3#{Al[jq       While f <> "" +o K*5 Y           ReDim Preserve in_flist(fCount)  {Ok]$0L           in_flist(fCount) = f ? RID4xu!           fCount += 1 TV?MB(mN           f = Dir$() 8)YDUE%VH       Wend "|/Q5*L       ReDim Preserve in_flist(fCount-1)