RPC Photonics扩散片BSDF

F^;ez/Gl   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

wlqksG[B   摘要： Ow,w$0(D   &j"?\f?   RPC Photonics公司有高品质的的工程漫射体BSDF测试数据，但它对于FRED帮助甚少，下面这个步骤描述了如何利用FRED脚本转换RPC Photonics提供的TXT文件，并将数据直接应用到FRED的Tabulated scatter 散射模型。 /(*q}R3Kfo   f.$af4 u   背景： 583|blL   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。 0S!K{xyR   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 Zb>?8   zRr*7G   ]{@-HTt   $<EM+oJ|ER   步骤 Z@!+v19^   @#l= l   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。 VpDbHAg   图2. RPC Photonics工程漫射体不同类型的散射数据 {JMVV_}n   n{mfn*r.   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） NZ0;5xGR   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 0aB;p7~&   例如下所示： rg!r[1c   Sample name:  EDF-C1-56 & Ok) :`   Merging data from file EDF-C1-56 0-0.txt !%c\N8<>GD   Finished merging RPC data for sample EDF-C1-56 -FaJ^CN~   FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt 2c*GuF9(0   4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 |@d\S[~^G   a. 创建一个新的散射库 lt8|9"9<   b. 散射模型命名 4|DWOQ':   c. 改变散射模型为“Tabulated BSDF”. k5pN   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 ） vl:KF7:#m   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。 UP,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， _w+ Qy.   g. 点击OK u'BaKWPS   5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 vXje^>_6   U>N1Od4vTO   CLRdm^B   脚本代码： pW3^X=6   ISvpQ 3{)s   '#Language "WWB-COM" fE mr^R   /k3:']G,s   Option Explicit wf<M)Rs|   &tj!*k'   Sub Main <)D$51 &0   ]c'A%:f<       'Cleanup ew4U)2J+       ClearOutputWindow() /j.9$H'y   Q^")jPd       Print "Merging RPC Photonics BSDF Data Files" PEZ!n.'S       SetTextColor(255,0,0) w\O;!1iU       Print "Note: Script should be located in the same folder as the BSDF TXT files." Cw&KVw*       Print "Note: Do not run this script multiple times without deleting the output file between executions." pEA:L$&       SetTextColor(0,0,0) )Pv%#P-<   0</);g}       'Current directory of this script (should be the same as the text files being merged) Y.p;1"       Dim cDir As String ^iV)MTT       cDir = MacroDir$ & "\" tKXIk9e   }O p; g^W       'Array which will be populated with the list of files to be merged )9]PMA?u       Dim fList() As String, curFile As String r9?Mw06Wc5       GetFileList( cDir, fList ) qJ-/7-$ ^   sRb9`u=)       Print "" TB31- ()       Print "Files found for merging:" #Gi$DMW       For Each curFile In fList do'GlU oMC           Print Chr(9) & curFile $[ *w"iQ       Next G 01ON0   A@#E@;lm       'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. pd$[8Rmj_       Dim nameArray() As String, sampName As String 5)X=*I       nameArray = Split(fList(0)," 0-0.txt") xyXa .       sampName  = nameArray(0) x kD6Iw       Print "" I7]8Y=xf       Print "Sample name: " & Chr(9) & sampName gs`q6f%(   .T`%tJ-Em       'Open an output file and write the FRED header data /PKNLK       Dim outFile As String -mh3DhJ,       outFile = cDir & sampName & "_FRED.txt" JW&gJASGC       Open outFile For Output As #1 {_*yGK48n       Print #1, "type bsdf_data" \Vk:93OH21       Print #1, "format angles=deg bsdf=value scale=1" 7zj{wp!   s5.CFA       'Loop the file list, skip the two header lines and write the remaining data to file 0> \sQ,T       Dim lineArray() As String, curLine As Long yB!dp;gM{       For Each curFile In fList k;Y5BB           Print "Merging data from file " & curFile m]&SNz=           ReadFile( cDir & curFile, lineArray ) "<gOzXpa           For curLine = 2 To UBound(lineArray) 3OB"#Ap8<               Print #1, lineArray(curLine) @O~pV`_tD           Next dc'Y`e       Next ^B^9KEjTz   # f\rt        'Close the output file [#iz/q~}       Close #1 N$tGQ@   5mR 1@       Print "Finished merging RPC data for sample " & sampName ia? c0xL       Print "FRED formatted data file: " & Chr(9) & outFile 2fS:- 8N   End Sub h2QmQ>y"   fN2lLn9/u   'Utility function to read the contents of a file into an array of strings. G!yPw:X   Function ReadFile(ByVal fileName As String, _ $:^td/p J                     ByRef lineArray() As String) As Long q.}CU.dp   2Khv>#l       ReadFile = -1 !<h)w#>en       Dim oFSO As Object |':{lH6+1       Set oFSO = CreateObject("Scripting.FileSystemObject") !'I8:v&D       Erase lineArray |vC~HJpuv'   GA. 8@3       Dim fid As Long 'c~4+o4co       If oFSO.fileexists( fileName ) Then pK4)yu+           fid = FreeFile() H,NF;QPPC           Open fileName For Input As fid t#yuOUg           lineArray = Split(Input(LOF(fid), fid), vbCrLf) QsW/X0YBv           Close fid '<uq3?5       End If y)<q/       Set oFSO = Nothing e}W)LPR!       Return UBound( lineArray ) 5IG-~jzCLb   5-A\9UC*@   End Function 7[wPn`v2   "wc<B4"   Sub GetFileList( ByVal in_dir As String, _ `0R./|bv\I                    ByRef in_flist() As String ) 4P o_-4   i-&yH       'Redimension the file list array d d;T-wa}       Erase in_flist "Rl}VeDY   LH6vLuf       'Tracks how many files are found F:ELPs4"       Dim fCount As Long sR8"3b<qA       fCount = 0 A%-6`>   p b,. r       'Recurse directory and search for text files b`_Q8 J       Dim f As String Y9|!+,       f = Dir$(in_dir & "*.txt") #LCb       While f <> "" ,u!sjx           ReDim Preserve in_flist(fCount) yDS4h(^           in_flist(fCount) = f %XTI-B/K           fCount += 1 MO]&bHH7;           f = Dir$() Q@HV- (A       Wend g,Y/M3>(       ReDim Preserve in_flist(fCount-1)