RPC Photonics扩散片BSDF

cKi^C   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

@^y?Bh9jQ   摘要： /A[oj2un    T/WmS?   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。 iSZctsqE   $tt0D?$4   背景： U'Ja\Ek/f   Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术，可以解决其他技术的不足，大大改善了诸如光刻系统、有效固态照明，显示，背光，显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体（Engineered DiffusersTM）的新概念，与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同，工程漫射体要求对于每个散射中心，通常为微透镜单元，都进行控制。例如全息漫射体可以视为一组随机排列的透镜，但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制：而无法单独操控每个微透镜单元，这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面，在工程漫射体中，每个微透镜单元形成漫射体，由其凹形纵断面和在阵列中的位置所确定。同时，为了确保漫射体不受输入光束变化的影响，并且不产生衍射效果，微透镜单元的分布是随机的，根据产生相应的光束形状函数所选取的概率分布函数来确定。因此，工程漫射体同时保留了随机与确定性漫射体的优点，从而实现高性能的光束整形功能。 (A]m=   FRED是美国Photon Engineering 公司开发的光学工程仿真软件，其在杂散光分析中独特的算法、高效的准确性，使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 图1. RPC Photonics工程漫射体结构及光束投射形状 c5wkzY h   90y9~.v   PcN fTB{   |;U}'|6   步骤 n}9Msen   {l *&l2   1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下，选择“Raw data”文件。 :EQme0OW   图2. RPC Photonics工程漫射体不同类型的散射数据 zT4ulXN   UgD'Bi   2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。（脚本代码放在了本文的最后） .5K C'?   3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 @ (u?=x;   例如下所示： Kl46CZs#8   Sample name:  EDF-C1-56 4U! .UNi   Merging data from file EDF-C1-56 0-0.txt zV_-rf   Finished merging RPC data for sample EDF-C1-56 v]`A_)[   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt ].<sAmL^   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 QGbD=c7   a. 创建一个新的散射库 Z$#ZYD   b. 散射模型命名 ^pQo`T6   c. 改变散射模型为“Tabulated BSDF”. _r?;lnWx@   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 ） z:i X]df   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。 e??{&[   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， rs 1*H   g. 点击OK Br ^rK}|l   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 T956L'.+G   &x0TnW"g   n?P 5pJ   脚本代码： ]|$$:e^U9   C I~;B   '#Language "WWB-COM" ev: !,}]w   @DQ"vFj6<   Option Explicit DKVt8/vq   ]}l+ !NV<   Sub Main 9+is?Pj   5#9Wd9LP       'Cleanup ndCS<ojcBP       ClearOutputWindow() @+CSY-g$   Q@ )rw0$       Print "Merging RPC Photonics BSDF Data Files" NKUI! [       SetTextColor(255,0,0) 5KH'|z       Print "Note: Script should be located in the same folder as the BSDF TXT files." 0h@%q;g       Print "Note: Do not run this script multiple times without deleting the output file between executions." 6kF uMtjc       SetTextColor(0,0,0) 76i rb!-   2gD{Fgf@N       'Current directory of this script (should be the same as the text files being merged) n8O dRv       Dim cDir As String F;Xq:e8       cDir = MacroDir$ & "\" ;&^"q{m   _6-/S!7Y \       'Array which will be populated with the list of files to be merged mQA<t)1       Dim fList() As String, curFile As String ^n45N&916       GetFileList( cDir, fList ) r4NT`&`g?   3JE;:2O~P       Print "" Ze sD(       Print "Files found for merging:" 4Ig{#}<       For Each curFile In fList bq6{ty"           Print Chr(9) & curFile 5WNg+       Next ah Xq{>   ot+~|Dl       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 6% y)       Dim nameArray() As String, sampName As String "0 PN       nameArray = Split(fList(0)," 0-0.txt") uF3p1by       sampName  = nameArray(0) 5B.??;xtaV       Print "" ])wMUJWg2       Print "Sample name: " & Chr(9) & sampName ]o+|jgkt]   9]F&Fz/G       'Open an output file and write the FRED header data v3JIUdU=P       Dim outFile As String XsN#<"f;i       outFile = cDir & sampName & "_FRED.txt" OO wA{]gK       Open outFile For Output As #1 S5 nw       Print #1, "type bsdf_data" 6-X?uaY)os       Print #1, "format angles=deg bsdf=value scale=1" E)_!Hi0<s   qCkg\)Ks5I       'Loop the file list, skip the two header lines and write the remaining data to file 4p.{G%h       Dim lineArray() As String, curLine As Long [;#.DH]       For Each curFile In fList v zm4           Print "Merging data from file " & curFile ,sJfMY           ReadFile( cDir & curFile, lineArray ) =i5:*J           For curLine = 2 To UBound(lineArray) |AfQ_iT6c               Print #1, lineArray(curLine) ?.A/E?Oc           Next /~rO2]rZ@       Next 0?Wf\7   U?^|>cMr       'Close the output file 8'xnhV       Close #1 4qz{D"M   RHAr[$       Print "Finished merging RPC data for sample " & sampName ;_\       Print "FRED formatted data file: " & Chr(9) & outFile R:R@sU   End Sub )* nbEZm@   udy;Od t   'Utility function to read the contents of a file into an array of strings. Jo(}#_y?   Function ReadFile(ByVal fileName As String, _ 'C>SyU                     ByRef lineArray() As String) As Long RH4n0=2   ,L:)ZZgN       ReadFile = -1 h16Nr x       Dim oFSO As Object H.[&gm}p>       Set oFSO = CreateObject("Scripting.FileSystemObject") [}>6n72gNh       Erase lineArray p33GKg0i+(   _w /N[E       Dim fid As Long jTgh+j]AP       If oFSO.fileexists( fileName ) Then X$&Sw3c           fid = FreeFile() yaYt/?|           Open fileName For Input As fid 5XUI7Q%           lineArray = Split(Input(LOF(fid), fid), vbCrLf) |#jm=rT0y           Close fid r8?Lr-;       End If $K5s)!       Set oFSO = Nothing +&zCmkVC7       Return UBound( lineArray ) *K.7Zf0   y]Tn#4 ,/   End Function j2qfEvU   :tG".z   Sub GetFileList( ByVal in_dir As String, _ B@vH1T                    ByRef in_flist() As String ) o5x^"#   LHz<=]?@       'Redimension the file list array )-"L4TC)       Erase in_flist fDHISJv   )tch>.EQ_       'Tracks how many files are found RX\O'Zwlj       Dim fCount As Long p% %Y^=z       fCount = 0 BmF>IQ`M?   3D dG$@       'Recurse directory and search for text files [ =2In;       Dim f As String Df3v"iCq}       f = Dir$(in_dir & "*.txt") 4:PP[2?       While f <> "" Y1+lk^           ReDim Preserve in_flist(fCount) I_*>E A           in_flist(fCount) = f O~0 1)%           fCount += 1 w|o@r%Q#l           f = Dir$() d$~b`       Wend PQ1NQy8       ReDim Preserve in_flist(fCount-1)