RPC Photonics扩散片BSDF

x:O?Fj   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

B%Dy;zdWd/   摘要： }]N7CWy   K0yTHX?(.   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。 g}@_ @   1[C,*\X8v   背景： y. @7aT5   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。 li8l+5d q   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 Cp&lS=   QQ!%lbMK]   YQ g03i   x"K<@mR5G   步骤 uz".!K[,wE   EE#4,d`J   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。 nM34zVy   图2. RPC Photonics工程漫射体不同类型的散射数据  +|).dm   =|bM|8,   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） ooreforr   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 1]aM)},   例如下所示： bv 5,Yk   Sample name:  EDF-C1-56 :h=];^/E   Merging data from file EDF-C1-56 0-0.txt l|^p;z:d   Finished merging RPC data for sample EDF-C1-56 sbZ)z#Tr   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt YTpSR~!Rj   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 o*eU0   a. 创建一个新的散射库 :"g^y6i   b. 散射模型命名 [MdVgJ9'   c. 改变散射模型为“Tabulated BSDF”. Cy4@\X% W   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 ） f}0(qN/G   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。 Zk"'x,]#   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， RlyF#X#7{   g. 点击OK c<wsWs 4V   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 UGj!I   e3"GC_*#   Oj\lg2Ck   脚本代码： q|b#=Af]g   OGh9^,v   '#Language "WWB-COM" [0El z@.C   RmY5/IYR|:   Option Explicit lPSyFb"   [U]U *x   Sub Main !JzM< hyg3   qxf!]jm       'Cleanup b4ZZyw       ClearOutputWindow() A&jkc'   Ij` %'/J       Print "Merging RPC Photonics BSDF Data Files" d }=fJ       SetTextColor(255,0,0) __teh>MC       Print "Note: Script should be located in the same folder as the BSDF TXT files." %/"I.\%d       Print "Note: Do not run this script multiple times without deleting the output file between executions." ci0)kxUBF       SetTextColor(0,0,0) vm"LPwSk>   g&!UaJ[#9       'Current directory of this script (should be the same as the text files being merged) 5,} )x]'x       Dim cDir As String ^.p({6H       cDir = MacroDir$ & "\" ?OW 4J0B'   a\ fG)Fqp       'Array which will be populated with the list of files to be merged x2=Bu#Y       Dim fList() As String, curFile As String Yrs7F.Y"       GetFileList( cDir, fList ) 9Bvi2 3   7n9&@D3:P       Print "" f_Ma~'3       Print "Files found for merging:" jzI70+E       For Each curFile In fList K'%2'd           Print Chr(9) & curFile f(:+JH<P~       Next QML z   T$%r?p(s       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. HC(Vu       Dim nameArray() As String, sampName As String FeoI+KA       nameArray = Split(fList(0)," 0-0.txt") $nF|n+m       sampName  = nameArray(0) [Gop-Vi/~       Print "" FM;NA{       Print "Sample name: " & Chr(9) & sampName 3u#bx1   z/!LC; (       'Open an output file and write the FRED header data dv-L!C       Dim outFile As String E-IVv       outFile = cDir & sampName & "_FRED.txt" e+6mbJ7y       Open outFile For Output As #1 ?g^42IYG       Print #1, "type bsdf_data" `|coA2$rw       Print #1, "format angles=deg bsdf=value scale=1" |a4cER.'2^   vT~ey       'Loop the file list, skip the two header lines and write the remaining data to file pqe7a3jr       Dim lineArray() As String, curLine As Long w^z5O6        For Each curFile In fList w\,N}' G           Print "Merging data from file " & curFile k-IL%+U           ReadFile( cDir & curFile, lineArray ) /N= }w C           For curLine = 2 To UBound(lineArray) vZ,DJ//U,               Print #1, lineArray(curLine) 7]W6\Z           Next #(swVo:+E       Next %jk7JDvl   0t*e#,y       'Close the output file |y9(qcKn$       Close #1 EP,j+^RVf   xfoQx_]$Im       Print "Finished merging RPC data for sample " & sampName ]H|O       Print "FRED formatted data file: " & Chr(9) & outFile c?5?TJpm   End Sub m}A|W[p<   fwQVxJe   'Utility function to read the contents of a file into an array of strings. \]C_ul'   Function ReadFile(ByVal fileName As String, _ dUN{@a\R0                     ByRef lineArray() As String) As Long R !g'zS'   R!i\-C1 S       ReadFile = -1 L$L/5/       Dim oFSO As Object 4`yE'%6.}       Set oFSO = CreateObject("Scripting.FileSystemObject") C7*n<+e       Erase lineArray =LXjq~p   wcH,!;3z+       Dim fid As Long ,w`g+ 9v       If oFSO.fileexists( fileName ) Then |w5m2Z           fid = FreeFile() `%QXaKO-           Open fileName For Input As fid 1lo.X_           lineArray = Split(Input(LOF(fid), fid), vbCrLf) L4O.=*P1           Close fid @)#EZQix       End If RW~!)^       Set oFSO = Nothing v[;R(pt?       Return UBound( lineArray ) srPczVG*   ^'9.VVyz   End Function /RVwhA+c   U#V&=~-   Sub GetFileList( ByVal in_dir As String, _ UQZl:DYa                    ByRef in_flist() As String ) R [ZY;g:p   m) 7Ql!l       'Redimension the file list array  Q XSS       Erase in_flist wE[gp+X~   {W+IUvn       'Tracks how many files are found d1P|v( `S9       Dim fCount As Long 1aI&jdJk       fCount = 0 QyghNImp   (E;+E\E       'Recurse directory and search for text files ;b{yu|       Dim f As String {FQ@eeU       f = Dir$(in_dir & "*.txt") =yF]#>Ah       While f <> "" Ii9[[I           ReDim Preserve in_flist(fCount) (Bq^ D9           in_flist(fCount) = f rJZR8bo           fCount += 1 H*j!_>W           f = Dir$() cY5w,.Q/!       Wend GO?hB4 9T       ReDim Preserve in_flist(fCount-1)