RPC Photonics扩散片BSDF

mRfF)   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

KWy4}7a@,s   摘要： ngEjbCV+   0?SdAF[:z   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。 e|AJx n]   }RG   背景： VILzx+v M   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。 lpve Yz   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 &^qD<eZ!Eq   ]t7<$L    rq}ew0&/   lh~!cOm\=E   步骤 ZxbWgM5rm   h{J2CWJ   1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下，选择“Raw data”文件。 J9I!d.U   图2. RPC Photonics工程漫射体不同类型的散射数据 l4hC>q$T   "=9L7.E)   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） v?!x,H$Qd   3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 8K6yqc H   例如下所示： .\{GU9|nO   Sample name:  EDF-C1-56 -`iZBC50   Merging data from file EDF-C1-56 0-0.txt (Pc:A!}   Finished merging RPC data for sample EDF-C1-56 "-A@>*g   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt f]%$HfF@   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 5 "^$3&)   a. 创建一个新的散射库 _hAp@? M   b. 散射模型命名 `dn|nI2   c. 改变散射模型为“Tabulated BSDF”. 8_8R$=V   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 ） ,t5Ku)eNm   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。 8>6+]]O   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， ga6M8eOI   g. 点击OK HWFo9as""v   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 uUwwR(R   !95ZK.UT   ^l7u^j    脚本代码： ~F+{P4%`<   HeNg<5v%Y   '#Language "WWB-COM" EFqWnz   zg0)9br   Option Explicit @FdtM<X   m+"?;;s   Sub Main d*3k]Ie%5f   u z4P       'Cleanup 80&JEtRh       ClearOutputWindow() yWsNG;>   R4]t D|       Print "Merging RPC Photonics BSDF Data Files" z6A rSLlZ       SetTextColor(255,0,0) |.)oV;9       Print "Note: Script should be located in the same folder as the BSDF TXT files." a 5:YP       Print "Note: Do not run this script multiple times without deleting the output file between executions." %mt|Dl       SetTextColor(0,0,0) m/Q@-   >j|.pi       'Current directory of this script (should be the same as the text files being merged) loLQ@?E       Dim cDir As String +I;b,p       cDir = MacroDir$ & "\" 1ePZs$    ]xCJ3.9       'Array which will be populated with the list of files to be merged M`9qo8zCi       Dim fList() As String, curFile As String k/u6Cw0/       GetFileList( cDir, fList ) KArR.o }   gieTkZ       Print "" [C,<Q       Print "Files found for merging:" C~yfuPr\B       For Each curFile In fList Zq}w}v           Print Chr(9) & curFile :0Rd )*k,v       Next /![S 3Ol   k>FMy#N|@       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. kBS;SDl)       Dim nameArray() As String, sampName As String o6'I%Gs       nameArray = Split(fList(0)," 0-0.txt") #Ne<=ayS       sampName  = nameArray(0) gah3d*d7       Print "" qb]n{b2       Print "Sample name: " & Chr(9) & sampName {W)Kz_   (/a2#iW       'Open an output file and write the FRED header data ~>VEg3#F       Dim outFile As String M$B 9?N6       outFile = cDir & sampName & "_FRED.txt" 1y2D]h/'       Open outFile For Output As #1 _[<R<&jG       Print #1, "type bsdf_data" t>)iC)^u       Print #1, "format angles=deg bsdf=value scale=1" /!=uM.   j\B]>PP5       'Loop the file list, skip the two header lines and write the remaining data to file hq6B pE       Dim lineArray() As String, curLine As Long `TYQ^Zm       For Each curFile In fList wc*5s7_           Print "Merging data from file " & curFile 3{LXx           ReadFile( cDir & curFile, lineArray ) @{iws@.           For curLine = 2 To UBound(lineArray) zH0%; o}               Print #1, lineArray(curLine) ug'I:#@2           Next jrbEJ.       Next n#uH^@#0   n (7m       'Close the output file HgvgO\`]       Close #1 @zL)R b%P$   +dX1`%RR[       Print "Finished merging RPC data for sample " & sampName ZR.1SA0x?O       Print "FRED formatted data file: " & Chr(9) & outFile Nwr.mtvh   End Sub m2E$[g   |Zr5I";   'Utility function to read the contents of a file into an array of strings. p(QB5at   Function ReadFile(ByVal fileName As String, _ >6*"g{/                     ByRef lineArray() As String) As Long MqGF~h|+   rbiNp6AdL       ReadFile = -1 ZF"f.aV8)       Dim oFSO As Object bW(+ Aw=O       Set oFSO = CreateObject("Scripting.FileSystemObject") IfzHe8>       Erase lineArray g0 v},n   }`8g0DPuD9       Dim fid As Long 9I0/KuZd O       If oFSO.fileexists( fileName ) Then O# .^}           fid = FreeFile() @kvgq 0ab           Open fileName For Input As fid ` wuA}v3!           lineArray = Split(Input(LOF(fid), fid), vbCrLf) %_0,z`f           Close fid jb~a z       End If $/90('D       Set oFSO = Nothing 1mhX3       Return UBound( lineArray ) 9!b,!#=   ?Z0T9e<   End Function LTj;e[   +6|Ys   Sub GetFileList( ByVal in_dir As String, _ DQ :w9                    ByRef in_flist() As String ) S+ 3'C   z~Ph=1O >p       'Redimension the file list array mr6/d1af_       Erase in_flist RIOR%~U   |7,|-s[R^       'Tracks how many files are found y3F13 Z@%       Dim fCount As Long wUWSW<       fCount = 0 34 - QgE   #P.jlpZk       'Recurse directory and search for text files `2c>M\c4U       Dim f As String }hrLM[       f = Dir$(in_dir & "*.txt") F@Y)yi?z       While f <> "" AWHB^}!}           ReDim Preserve in_flist(fCount) |-4C[5rM           in_flist(fCount) = f 4r;!b;3           fCount += 1 4o8uWS{`           f = Dir$() ;F9<Yv       Wend |7 n&I`#       ReDim Preserve in_flist(fCount-1)