RPC Photonics扩散片BSDF

{Q37a=;,   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

$OdBuJA   摘要： 7l$ u.[   q?Csm\ Y   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。 Ha|}Oj   2"?DaX   背景： #) :.1Z?   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。 f,E7eL@   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 gSw4\R   7I'C'.6iM   $/C1s"C@O   .MG83Si   步骤 UO&$1rV   tuIZYp8tIN   1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下，选择“Raw data”文件。 =k.%#h{   图2. RPC Photonics工程漫射体不同类型的散射数据 ZIa,pON   =?0v,;F9|   2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。（脚本代码放在了本文的最后） te2vv]W1   3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 2b"Dk Jj'   例如下所示： d1\nMm}v   Sample name:  EDF-C1-56 G 3,v'D5   Merging data from file EDF-C1-56 0-0.txt ]"HaE-`%   Finished merging RPC data for sample EDF-C1-56 ~a[/l   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt #:0-t!<0C   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 aIFlNS,y   a. 创建一个新的散射库 n<j+KD#a   b. 散射模型命名 3.?be.cq   c. 改变散射模型为“Tabulated BSDF”. &l7E|.JE   d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） z9[TjTH^}T   e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 yD7}   f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， ap )B%9   g. 点击OK ~qeFSU(   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 5Y^"&h[/   :=;{w~D   z/xPI)R[   脚本代码： !2.BLJE>   "E\mj'k   '#Language "WWB-COM" f\dfKNm6   [Cv./hE Qi   Option Explicit SDil\x   =/46;844T   Sub Main F""9O6u   Rv9jLH       'Cleanup wxo       ClearOutputWindow() 9;U?_    ]5S`y{j1       Print "Merging RPC Photonics BSDF Data Files" 0GrM:Lh y       SetTextColor(255,0,0) Na/Y1RW       Print "Note: Script should be located in the same folder as the BSDF TXT files." |A'I!Jm       Print "Note: Do not run this script multiple times without deleting the output file between executions." RSym9t90t       SetTextColor(0,0,0) *"8Ls0!   9%T"W       'Current directory of this script (should be the same as the text files being merged) K-C,n~-       Dim cDir As String (?\+        cDir = MacroDir$ & "\" rMxIujx   `9K5 ;]       'Array which will be populated with the list of files to be merged 6EyPZ{       Dim fList() As String, curFile As String )Q =>7%ZA       GetFileList( cDir, fList ) $!.> )n   @!f4>iUy       Print "" l(sVnhL6h       Print "Files found for merging:" /VT/KT{       For Each curFile In fList p 4>ThpX           Print Chr(9) & curFile $q@d.Z>;       Next ^-~JkW'z   UrvUt$WO       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. KN|<yF        Dim nameArray() As String, sampName As String mfQ#n!{ZH       nameArray = Split(fList(0)," 0-0.txt") 8-nf4=ll       sampName  = nameArray(0) <@-O06       Print "" gfg,V.:       Print "Sample name: " & Chr(9) & sampName B]"`}jn   R}Lk$#S#       'Open an output file and write the FRED header data ( *+'k1Ea       Dim outFile As String V[nPTYO4       outFile = cDir & sampName & "_FRED.txt" )FQ"l{P       Open outFile For Output As #1 1z-.e$&z       Print #1, "type bsdf_data" xGwImF$r       Print #1, "format angles=deg bsdf=value scale=1" lWId 0eNS   _ Ncbo#G       'Loop the file list, skip the two header lines and write the remaining data to file [v"Z2F<.=       Dim lineArray() As String, curLine As Long ;yt6Yp.6e       For Each curFile In fList SU~a()"           Print "Merging data from file " & curFile ! dzgi:           ReadFile( cDir & curFile, lineArray ) >s{I@#9           For curLine = 2 To UBound(lineArray) njy2pDC@               Print #1, lineArray(curLine) I y9hBAg\y           Next ={:a N)       Next 2H|:/y   .c"nDCFVR       'Close the output file }]vUr}Els       Close #1 %PYl   dM-cQo:       Print "Finished merging RPC data for sample " & sampName | ;tH?E       Print "FRED formatted data file: " & Chr(9) & outFile r<+C,h;aww   End Sub (gBKC]zvz3   'cs(gc0   'Utility function to read the contents of a file into an array of strings. !LN8=u.   Function ReadFile(ByVal fileName As String, _ !2L X+*;                     ByRef lineArray() As String) As Long ~ wb1sn3   =:WZV8@%       ReadFile = -1 O^@8Drg c       Dim oFSO As Object p'/\eBhG]=       Set oFSO = CreateObject("Scripting.FileSystemObject") Y.viOHL       Erase lineArray g<:Lcg"u   _ >OP       Dim fid As Long RPz[3y       If oFSO.fileexists( fileName ) Then 7]h%?W!           fid = FreeFile() y*i&p4Y*           Open fileName For Input As fid t}q e_c           lineArray = Split(Input(LOF(fid), fid), vbCrLf) ;28d7e}           Close fid u;`]U$Qq9       End If i1 E|lp)       Set oFSO = Nothing (0$~T}lH       Return UBound( lineArray ) Tru{8]uMH   W>@ti9\t   End Function &GP(yj]   d9f7 &   Sub GetFileList( ByVal in_dir As String, _ \H] |5fp*                    ByRef in_flist() As String ) 7OV^>"S   tDK@?PfKz       'Redimension the file list array v ccH(T       Erase in_flist k"N>pjgd$   r6DLShP-Ur       'Tracks how many files are found sU_K^=6*       Dim fCount As Long PF{uaKWk       fCount = 0 s.2f'i+   Dp'urf\*$       'Recurse directory and search for text files )pWgt5:7~       Dim f As String !7N:cx'Qy       f = Dir$(in_dir & "*.txt") sf> E       While f <> "" s6`E.Eevm           ReDim Preserve in_flist(fCount) .hT>a<           in_flist(fCount) = f "<CM'R           fCount += 1 F]$ Nu           f = Dir$() m%HT)`>bg       Wend ^)AECn       ReDim Preserve in_flist(fCount-1)