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摘要: >$,y5 	AJ&  9 `w)
 RPC Photonics公司有高品质的的工程漫射体BSDF测试数据,但它对于FRED帮助甚少,下面这个步骤描述了如何利用FRED脚本转换RPC Photonics提供的TXT文件,并将数据直接应用到FRED的Tabulated scatter 散射模型。 Jte#ZnP    =n'
4?W@  背景:  r,Nq7Txn?  Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术,可以解决其他技术的不足,大大改善了诸如光刻系统、有效固态照明,显示,背光,显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体(Engineered DiffusersTM)的新概念,与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同,工程漫射体要求对于每个散射中心,通常为微透镜单元,都进行控制。例如全息漫射体可以视为一组随机排列的透镜,但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制:而无法单独操控每个微透镜单元,这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面,在工程漫射体中,每个微透镜单元形成漫射体,由其凹形纵断面和在阵列中的位置所确定。同时,为了确保漫射体不受输入光束变化的影响,并且不产生衍射效果,微透镜单元的分布是随机的,根据产生相应的光束形状函数所选取的概率分布函数来确定。因此,工程漫射体同时保留了随机与确定性漫射体的优点,从而实现高性能的光束整形功能。 o`q_wdy?	  FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 n Ml%'[u
 图1. RPC Photonics工程漫射体结构及光束投射形状ZJ	77[    lME)?LOI    hwIMn33  步骤 ]Wq?H-B{ E)9yH\$6  1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 f}@jFhr'<    !\,kZ|#>
 图2. RPC Photonics工程漫射体不同类型的散射数据4)<~4	'  2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) N]<!j$pOz  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 W!"}E%zx  例如下所示: `/MvQ/  Sample name:  EDF-C1-56  zWb4([P;  Merging data from file EDF-C1-56 0-0.txt  \C`~S7jC  Finished merging RPC data for sample EDF-C1-56  {|yob4N  FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt  "luR9l,RRE  4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 RNhJ'&SYs  a. 创建一个新的散射库 E gDQ+(
-  b. 散射模型命名 ^+1#[E  c. 改变散射模型为“Tabulated BSDF”. 9Y<#=C  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 ) W5' 3$,X9  e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 'D%w|Pe?Q  f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, _C+b]r/E  g. 点击OK `r_m+]  5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 ??i4z[0M    v
(2GX     s9>(Jzcf9  脚本代码: %Jf<l&K.`    ?^EXTU85`"  '#Language "WWB-COM" &k1T08C*    )
9oH,gZ  Option Explicit 03iv3/{H    E3*\
^Q_  Sub Main d|*"IFe    Z-B%'/.      'Cleanup <uc1D/~^:      ClearOutputWindow() ejO}t:}P    n?:=        Print "Merging RPC Photonics BSDF Data Files" [*Z`Kc      SetTextColor(255,0,0) {h	KjD"?      Print "Note: Script should be located in the same folder as the BSDF TXT files." <soz#}e      Print "Note: Do not run this script multiple times without deleting the output file between executions." QERU5|.wc      SetTextColor(0,0,0) 033T>qY    Jy	
aag-      'Current directory of this script (should be the same as the text files being merged) rO:u6."_      Dim cDir As String B<~U3b      cDir = MacroDir$ & "\" u?[ q=0.J7    7E @+      'Array which will be populated with the list of files to be merged a@pz*e      Dim fList() As String, curFile As String \)48904^      GetFileList( cDir, fList ) ?~QIALA    t
nS+5F      Print "" 4TwQO$C      Print "Files found for merging:" JNFIT;L      For Each curFile In fList +]@Az.E          Print Chr(9) & curFile T'fcc6D5p      Next nCKbgM'"    aRc '      'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. b`_w])Y@      Dim nameArray() As String, sampName As String '&;69`FSe      nameArray = Split(fList(0)," 0-0.txt") {@u<3 s      sampName  = nameArray(0) ZCg`z      Print "" s6}Xt=j      Print "Sample name: " & Chr(9) & sampName sK	2
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pAu72O?      'Open an output file and write the FRED header data EHlytG}@      Dim outFile As String 4{qB X?      outFile = cDir & sampName & "_FRED.txt" K{l5m{:%      Open outFile For Output As #1 Se!)n;?7Sw      Print #1, "type bsdf_data" =_[Z	W      Print #1, "format angles=deg bsdf=value scale=1" s(_+!d6    9Z6C8Jv      'Loop the file list, skip the two header lines and write the remaining data to file R1-k3;v^      Dim lineArray() As String, curLine As Long $iM=4
3W      For Each curFile In fList L;QY<b          Print "Merging data from file " & curFile ?_`0G/xl          ReadFile( cDir & curFile, lineArray ) &)pK%SAM          For curLine = 2 To UBound(lineArray) w G8Wez%              Print #1, lineArray(curLine) jFerYv&K~          Next m/`IGT5J      Next r
Db>&s3    (H?ZSeWx      'Close the output file IB|]fzy      Close #1 4UAvw    9B)(>~q      Print "Finished merging RPC data for sample " & sampName A.Bk/N1G      Print "FRED formatted data file: " & Chr(9) & outFile &gc`<kLu  End Sub +@VYs*&&    r?l;I3~  'Utility function to read the contents of a file into an array of strings. h<+|x7u  Function ReadFile(ByVal fileName As String, _ CDp8)=WJFF                    ByRef lineArray() As String) As Long _N3}gFh>    k*-NsNPw$      ReadFile = -1 l
oqvi      Dim oFSO As Object #3kXmeyrD      Set oFSO = CreateObject("Scripting.FileSystemObject") &2EBk= X      Erase lineArray Xev54!619    CQODXB^      Dim fid As Long cbKL$|      If oFSO.fileexists( fileName ) Then &14W	vAU          fid = FreeFile() Poa?Ej           Open fileName For Input As fid Y(GN4@`S          lineArray = Split(Input(LOF(fid), fid), vbCrLf) J<JBdk          Close fid J  fcMca       End If /'y5SlE[J      Set oFSO = Nothing 4x'AC%&Qi      Return UBound( lineArray ) U	'[?9/T    |t\|:E>"	}  End Function l9{#sas    .F0]6#(  Sub GetFileList( ByVal in_dir As String, _ ykq'g|                   ByRef in_flist() As String ) ]Qi,j#X    	c!&Qj      'Redimension the file list array :G'xi2bs      Erase in_flist dmR3Y.\jd    JZ`L%      'Tracks how many files are found ui'F'"tPz      Dim fCount As Long OoP@-D"e      fCount = 0 n_$yV:MuT!    !Y;<:zx5      'Recurse directory and search for text files LCQkgRs}~{      Dim f As String =sQ(iso%f      f = Dir$(in_dir & "*.txt") ID8k/t!      While f <> "" Jm![W8L          ReDim Preserve in_flist(fCount) \_oy$>;          in_flist(fCount) = f 2ALj}          fCount += 1 RT"O;P           f = Dir$() @)sc6
*lnW      Wend Bt>}LLBS2      ReDim Preserve in_flist(fCount-1) vmKTF!;    )
YSh D  End Sub |}qjqtZ |