RPC Photonics扩散片BSDF

2tr2:PB`   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

N{9<Tf*   摘要： 3mJHk<m8T   H1?1mH   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。 r\3In-(AT   `a6;* ry   背景： /BIPLDN6   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。 \:=Phbn   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 D\`$   B)-S@.u   d=5D 9'+   z{n=G   步骤 yQx>h6   ?APzx@$D.   1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下，选择“Raw data”文件。 0"QE,pLe4   图2. RPC Photonics工程漫射体不同类型的散射数据 1Xs!ew)>   B\=&v8   2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。（脚本代码放在了本文的最后） 'QV4=h`   3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 2)8lJXM$L   例如下所示： u51/B:+   Sample name:  EDF-C1-56 isd[l-wAmf   Merging data from file EDF-C1-56 0-0.txt Va 5U`0   Finished merging RPC data for sample EDF-C1-56 9/%|#b-z   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt X! ]~]%K$y   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 ji8Rd"S   a. 创建一个新的散射库 w}1)am&pD   b. 散射模型命名 'RA[_Z   c. 改变散射模型为“Tabulated BSDF”. Qxvz}r.l]   d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） JIQzP?+?   e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 [)Ge^yI7   f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， T#BOrT>V   g. 点击OK 95<:-?4C;W   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 1=D!C lcb   , \m c.80   W[?B@sdSZ   脚本代码： vK{K#{   ?)X@4Jem   '#Language "WWB-COM" MJC Yi<D   +|?c_vD   Option Explicit hB.dqv]^   `Q8D[   Sub Main @3@%9E   &qU[wn:1       'Cleanup 1)R)+`y       ClearOutputWindow() D[r   MQ+ek4       Print "Merging RPC Photonics BSDF Data Files" 1,QRfckks       SetTextColor(255,0,0) /f[_]LeV]       Print "Note: Script should be located in the same folder as the BSDF TXT files." a9I8WQ        Print "Note: Do not run this script multiple times without deleting the output file between executions." zXD@M{       SetTextColor(0,0,0) O92Yd$S   ^ UzF nW@a       'Current directory of this script (should be the same as the text files being merged) ,J^Op        Dim cDir As String 3q>"#+R.t       cDir = MacroDir$ & "\" 9VByFQgM   'SieZI m)       'Array which will be populated with the list of files to be merged >H1d9y+Z       Dim fList() As String, curFile As String Jc)1}       GetFileList( cDir, fList ) p\WUk@4   5^dw!^d       Print "" EyeLC6u       Print "Files found for merging:" U)!AH^{32       For Each curFile In fList E;4a(o]{t           Print Chr(9) & curFile O,{ (       Next Wg%-m%7O   Ae#6=]V+^       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. w}0Qy       Dim nameArray() As String, sampName As String T42g4j/l~       nameArray = Split(fList(0)," 0-0.txt") 7q2YsI       sampName  = nameArray(0) fh^_=R(/       Print "" 0- UeFy       Print "Sample name: " & Chr(9) & sampName JdHc'WtS!|   6!nb)auVi       'Open an output file and write the FRED header data MUrY>FYgx       Dim outFile As String }D^Gt)       outFile = cDir & sampName & "_FRED.txt" ="DgrH       Open outFile For Output As #1 L@Z &v'A       Print #1, "type bsdf_data" 7|-xM>L$A       Print #1, "format angles=deg bsdf=value scale=1" 0Nu]N)H5<l   oc(bcU       'Loop the file list, skip the two header lines and write the remaining data to file a{+oN $       Dim lineArray() As String, curLine As Long N::;J       For Each curFile In fList "{_"NjH           Print "Merging data from file " & curFile 1Tq$E[           ReadFile( cDir & curFile, lineArray ) c)8wO=!           For curLine = 2 To UBound(lineArray) $D5U #               Print #1, lineArray(curLine) IJ8DN@w9           Next 7gwZ9Fob       Next `<zb   S nHAY<       'Close the output file F4x7;?W{*       Close #1 hYn'uL^~[   x]oQl^F       Print "Finished merging RPC data for sample " & sampName E/ZJ\@gzD       Print "FRED formatted data file: " & Chr(9) & outFile *u/|NU&X   End Sub (weokP!   LrMFzd}_O   'Utility function to read the contents of a file into an array of strings. [bG>qe1}&   Function ReadFile(ByVal fileName As String, _ 4E>(Y98                     ByRef lineArray() As String) As Long < 6C9R>   noA\5&hqW       ReadFile = -1 k~f+LO       Dim oFSO As Object /8}+#h)[       Set oFSO = CreateObject("Scripting.FileSystemObject") S I7B6c       Erase lineArray :XSc#H4   es[5B* 5       Dim fid As Long zD^f%p ["#       If oFSO.fileexists( fileName ) Then S=,1} XZ           fid = FreeFile() Oq, .Kz           Open fileName For Input As fid #2jn4>           lineArray = Split(Input(LOF(fid), fid), vbCrLf) Q!X_&ao)O           Close fid nnL$m_K~       End If rA,Y_1b *       Set oFSO = Nothing "g%:#'5       Return UBound( lineArray ) &&1Y"dFs   93IOG{OAY   End Function lE)rRG+JLW   Czr4 -#2   Sub GetFileList( ByVal in_dir As String, _ _(`X .D                    ByRef in_flist() As String ) `u~   z<6P3x|       'Redimension the file list array +){a[@S@x       Erase in_flist 9]@J*A}=l   ;"Y;l=9_       'Tracks how many files are found K#UA M.       Dim fCount As Long #)A?PO2       fCount = 0 p@8krOo`   #IaBl?}r^       'Recurse directory and search for text files 3Ge<G       Dim f As String 5**5b9bj-9       f = Dir$(in_dir & "*.txt") @MZ6E$I       While f <> "" U.Chf9a-           ReDim Preserve in_flist(fCount) b?] S&)"9           in_flist(fCount) = f xrVZxK:!           fCount += 1 RO$@>vL           f = Dir$() Da8$Is;n       Wend Z#Zzi5<       ReDim Preserve in_flist(fCount-1)