RPC Photonics扩散片BSDF

N.\- 8?>   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

23c 8   摘要： v-#Q7T   S'4(0j   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。 J&M o%"[)   $ {O#   背景： y`F3Hr c   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。 ~rDZ?~%   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 6kNrYom   8vMG5 #U[   |.F$G<   VtnRgdJ   步骤 JBXrFC;   }q $5ig   1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下，选择“Raw data”文件。 AyNI$Q6Z   图2. RPC Photonics工程漫射体不同类型的散射数据 Ove<mFI\   g+pml*LJ   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） #:[t^}   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 q=%RDG+   例如下所示： 4x   Sample name:  EDF-C1-56 g]4(g<:O   Merging data from file EDF-C1-56 0-0.txt {@+Ty]e   Finished merging RPC data for sample EDF-C1-56 w2 a 1mU/   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt i+p^ ^t\   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 .!f$ \1l   a. 创建一个新的散射库 Y8m1M-#w   b. 散射模型命名 Y~L2   c. 改变散射模型为“Tabulated BSDF”. (Tn- >).AO   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 ） E%rk[wI   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。 <kGU,@6PF   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， M}yDXJx   g. 点击OK ZUoxMm   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 1guJG_;z   ^>jwh   QR%mj*@Wle   脚本代码： [R=yF ~-   \Ta"}TF8   '#Language "WWB-COM" ~8GFQ ph   IF44F3(V4   Option Explicit /H8g(   =<?+#-;p   Sub Main f"%{%M$K   nEJY5Bz$       'Cleanup 8=NM|i       ClearOutputWindow() _#r+ !e   Q36qIq_0e       Print "Merging RPC Photonics BSDF Data Files" 5]AC*2(       SetTextColor(255,0,0) mj9 <%P       Print "Note: Script should be located in the same folder as the BSDF TXT files." aqj@Cjk4Z       Print "Note: Do not run this script multiple times without deleting the output file between executions." L*&p!       SetTextColor(0,0,0) czS+< w   )N7Y^CN~       'Current directory of this script (should be the same as the text files being merged) [8T^@YN       Dim cDir As String ,N!o       cDir = MacroDir$ & "\" b:tob0TB   G#d{,3Gq1       'Array which will be populated with the list of files to be merged umt.Um.m2       Dim fList() As String, curFile As String 1Cv-       GetFileList( cDir, fList ) j)<IRD^   ;<j0f~G`       Print "" &Low/Y'.jJ       Print "Files found for merging:" KG|n       For Each curFile In fList ]x(e&fyHB           Print Chr(9) & curFile m^ tFi7c       Next PIdikA   TFkZpe;       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. `f*Q$Ulqx       Dim nameArray() As String, sampName As String ^j31S*f&:       nameArray = Split(fList(0)," 0-0.txt") G 8g<>d{j       sampName  = nameArray(0) $W!!wN=B       Print "" *>n;SuT_       Print "Sample name: " & Chr(9) & sampName tt0f-:#   j g8fU       'Open an output file and write the FRED header data VGpWg rmHk       Dim outFile As String 0n;< ge&~R       outFile = cDir & sampName & "_FRED.txt" 7"20hAd       Open outFile For Output As #1 JM x>][xD       Print #1, "type bsdf_data" \s=t|Wpu2       Print #1, "format angles=deg bsdf=value scale=1" 7UVzp v   W4pL ,(S       'Loop the file list, skip the two header lines and write the remaining data to file Xq_5Qv       Dim lineArray() As String, curLine As Long WtG~('g>&       For Each curFile In fList "4riSxEyF           Print "Merging data from file " & curFile bN]+_ mF           ReadFile( cDir & curFile, lineArray ) C8Qa$._           For curLine = 2 To UBound(lineArray) F'4w;-ax               Print #1, lineArray(curLine) 0 q}*S~           Next '98VYCL       Next pTPi@SBaP{   {khqu:HUn`       'Close the output file mS(fgq6       Close #1 m[~V/N3   WD]pU       Print "Finished merging RPC data for sample " & sampName nbm&wa[       Print "FRED formatted data file: " & Chr(9) & outFile j|U#)v/   End Sub ++6`sMJ   \m(VdE   'Utility function to read the contents of a file into an array of strings. eg(6^:z?f   Function ReadFile(ByVal fileName As String, _ xJ>fm%{5                     ByRef lineArray() As String) As Long $c]fPt"i   o U056       ReadFile = -1 =t9\^RIx)?       Dim oFSO As Object :=u?Fqqws       Set oFSO = CreateObject("Scripting.FileSystemObject") /?@3.3sl_       Erase lineArray /{+y2.{j   =e9>FWf>       Dim fid As Long 2NC.Z;       If oFSO.fileexists( fileName ) Then CG0 M           fid = FreeFile() g.BdlVB\           Open fileName For Input As fid cq}EZ@ .           lineArray = Split(Input(LOF(fid), fid), vbCrLf) =Xi07_8Ic<           Close fid wQ^EYKD       End If _P0T)-X\(       Set oFSO = Nothing YB(Q\hT~\;       Return UBound( lineArray ) d:BG#\e]v   coW:DFX   End Function JMrEFk   A#.edVj.g4   Sub GetFileList( ByVal in_dir As String, _ ;j[>9g                    ByRef in_flist() As String ) ,\_1w   ,]9P{k]O       'Redimension the file list array G`cHCP_n       Erase in_flist 2oVSn"   em,u(#)&       'Tracks how many files are found R3x3]]D       Dim fCount As Long `uOT+B%R       fCount = 0 1S{D6#bE   B2 >H_dmQ       'Recurse directory and search for text files 'u*DA|HC       Dim f As String y v t.       f = Dir$(in_dir & "*.txt") U{2BVqM       While f <> "" ULs\+U           ReDim Preserve in_flist(fCount) */sS`/Lx           in_flist(fCount) = f ojaws+(& y           fCount += 1 >3p\m           f = Dir$() '(U-(wTC'/       Wend X <f8,n       ReDim Preserve in_flist(fCount-1)