RPC Photonics扩散片BSDF

F{.\i*$   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

G$2@N6   摘要： /!MVpi'6&   no W]E}nN   RPC Photonics公司有高品质的的工程漫射体BSDF测试数据，但它对于FRED帮助甚少，下面这个步骤描述了如何利用FRED脚本转换RPC Photonics提供的TXT文件，并将数据直接应用到FRED的Tabulated scatter 散射模型。 I)yF!E &   <&# MX   背景： f%i%QZP   Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术，可以解决其他技术的不足，大大改善了诸如光刻系统、有效固态照明，显示，背光，显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体（Engineered DiffusersTM）的新概念，与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同，工程漫射体要求对于每个散射中心，通常为微透镜单元，都进行控制。例如全息漫射体可以视为一组随机排列的透镜，但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制：而无法单独操控每个微透镜单元，这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面，在工程漫射体中，每个微透镜单元形成漫射体，由其凹形纵断面和在阵列中的位置所确定。同时，为了确保漫射体不受输入光束变化的影响，并且不产生衍射效果，微透镜单元的分布是随机的，根据产生相应的光束形状函数所选取的概率分布函数来确定。因此，工程漫射体同时保留了随机与确定性漫射体的优点，从而实现高性能的光束整形功能。 Xhq6l3M   FRED是美国Photon Engineering 公司开发的光学工程仿真软件，其在杂散光分析中独特的算法、高效的准确性，使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 图1. RPC Photonics工程漫射体结构及光束投射形状 z:$ibk4#h   nzaA_^`mB   jRd$Vt   YCQ$X   步骤 7BL)FJ]UR]   zhm0J-g   1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下，选择“Raw data”文件。 [sjkm+ ?   图2. RPC Photonics工程漫射体不同类型的散射数据 %<x!mE x   46pR!k   2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。（脚本代码放在了本文的最后） l? U!rFRq`   3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 r~2hTie   例如下所示： =JW-EQ6[T   Sample name:  EDF-C1-56 d$n31F   Merging data from file EDF-C1-56 0-0.txt )UM^#<-   Finished merging RPC data for sample EDF-C1-56 5A*&!1T   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt 8Y.9%@   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 K, I   a. 创建一个新的散射库 mLpM8~L   b. 散射模型命名 yW(|auq   c. 改变散射模型为“Tabulated BSDF”. R^$|D)(   d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） ruGeN   e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 R"9wVM;*c   f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， huS*1xl   g. 点击OK jS~ Pdz   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 M:{Aq&.   /.<v,CR   |oke)w=gn   脚本代码： /KX+'@   !{(Bc8 hT   '#Language "WWB-COM" Z#L4n#TT   )0iN2L]U;   Option Explicit Zi. ' V   i/ %lB   Sub Main (or"5}\6-   Pv/v=s>X       'Cleanup giX[2`^NG       ClearOutputWindow() |Ia9bg'1U   GPK\nz }       Print "Merging RPC Photonics BSDF Data Files" r+8D|stS       SetTextColor(255,0,0) F{!pii5O9       Print "Note: Script should be located in the same folder as the BSDF TXT files." cO*g4VL"[       Print "Note: Do not run this script multiple times without deleting the output file between executions." 3>-h- cpMX       SetTextColor(0,0,0) %Qlc?Wl:   3g;,       'Current directory of this script (should be the same as the text files being merged) #aU!f"SS       Dim cDir As String HyU:BW;       cDir = MacroDir$ & "\" P+}~6}wJE   Q`<{cFsU       'Array which will be populated with the list of files to be merged LCH\;07V#       Dim fList() As String, curFile As String cQyN@W       GetFileList( cDir, fList ) <cp9+P <   o~IAZU39       Print "" 7>__ fQu       Print "Files found for merging:" `.@sux!lu       For Each curFile In fList X!ruQem /           Print Chr(9) & curFile ;_e9v,       Next |cf-S8pwY   @m9pb+=v       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. WC`h+SC`.       Dim nameArray() As String, sampName As String 'UIFP#GtFO       nameArray = Split(fList(0)," 0-0.txt") #@$80eFq       sampName  = nameArray(0) fUkqhqe       Print "" >8"Svt$       Print "Sample name: " & Chr(9) & sampName /;#kV]nF   eZa*WI=       'Open an output file and write the FRED header data vTO9XHc E       Dim outFile As String #`*uX6C       outFile = cDir & sampName & "_FRED.txt" OL >>/T       Open outFile For Output As #1 @@Ybg6.+*       Print #1, "type bsdf_data" ORs:S$Nt$       Print #1, "format angles=deg bsdf=value scale=1" q>.7VN[ vE   #dWz,e3        'Loop the file list, skip the two header lines and write the remaining data to file tF`L]1r>       Dim lineArray() As String, curLine As Long <|}Z6Ti       For Each curFile In fList Qh1pX}X           Print "Merging data from file " & curFile 6:#o0OeBP           ReadFile( cDir & curFile, lineArray ) RW. qw4           For curLine = 2 To UBound(lineArray) 0Idek               Print #1, lineArray(curLine) 't5ufAT           Next 6DHK&<=D8       Next SH{@yS[c!   G;G*!nlWf       'Close the output file 0!\C@wnH       Close #1 G&g;ROgY   $*#^C; 7O       Print "Finished merging RPC data for sample " & sampName 89FAh6uE       Print "FRED formatted data file: " & Chr(9) & outFile ,=u;1   End Sub /grTOf&   [`\VgKeu   'Utility function to read the contents of a file into an array of strings.  !Ld5Y$   Function ReadFile(ByVal fileName As String, _ ^Spu/55_                     ByRef lineArray() As String) As Long )}@D\(/@   )j36Y =r3       ReadFile = -1 ?Ij (B}D       Dim oFSO As Object f CU]       Set oFSO = CreateObject("Scripting.FileSystemObject") ?.46X^       Erase lineArray @sLN   fs'SCwx       Dim fid As Long ; j!dbT~5       If oFSO.fileexists( fileName ) Then '? 5 -           fid = FreeFile() 5^g*           Open fileName For Input As fid ,<Q           lineArray = Split(Input(LOF(fid), fid), vbCrLf) HoGYgye=           Close fid ,>a!CnK=       End If %GhI0F #       Set oFSO = Nothing ="voJgvw       Return UBound( lineArray ) ,eyh%k*hz   F06o-xH=   End Function v76Gwu$d   ^^N|:80   Sub GetFileList( ByVal in_dir As String, _ +F8{4^w1                    ByRef in_flist() As String ) |(>`qL{|   Dp([r       'Redimension the file list array Tx;a2:6\[       Erase in_flist b)d;eS   Nm ?^cR5r       'Tracks how many files are found qIi \[Ugh       Dim fCount As Long :<J7g`f       fCount = 0 QHR,p/p   EqW~ K@       'Recurse directory and search for text files Ek{QNlQ]4       Dim f As String $tmdE)"&       f = Dir$(in_dir & "*.txt") vE:*{G;Y       While f <> "" uHgq"e           ReDim Preserve in_flist(fCount) 9 J3fiA_           in_flist(fCount) = f 6.D|\;9{c           fCount += 1 E_ns4k#uG           f = Dir$() !Km[Qw k-       Wend io4<HN       ReDim Preserve in_flist(fCount-1)