[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： cW``M.d'F  
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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。 LjdYsa
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背景： I|/'Ds:  
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。 #~Q8M*~@  
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。 [k]|Qink  
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步骤 cywg[  
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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。 Ewo*yY>  
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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） s%;<O:x8o  
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 P ,K\  
例如下所示： uv4 _:   
Sample name:  EDF-C1-56 -PAF p3w\y  
Merging data from file EDF-C1-56 0-0.txt J?P]EQU  
Finished merging RPC data for sample EDF-C1-56 Pd
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FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt #B\=Aa`*  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 X9~m8c){z  
a. 创建一个新的散射库 2w?G.pO#  
b. 散射模型命名 {TZE/A3D,  
c. 改变散射模型为“Tabulated BSDF”. WfGH|u  
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 ） Nm8w/Q5D`  
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。 lVeH+"M?  
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， ;mO,3dV  
g. 点击OK ccO aCr  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 2ALj}  
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脚本代码： oA3d^%(c  
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'#Language "WWB-COM" <q7s`,rG  
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Option Explicit n0.8)=;2  
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Sub Main v+tO$QZ`  
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    'Cleanup 1hNEkpL^a  
    ClearOutputWindow() Dy
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    Print "Merging RPC Photonics BSDF Data Files" fjkT5LNxk  
    SetTextColor(255,0,0) #D:RhqjK  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." `9EVB;  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." 9`&77+|;e  
    SetTextColor(0,0,0) <t6d)mJ%  
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    'Current directory of this script (should be the same as the text files being merged) NhtEW0xCr  
    Dim cDir As String 1OPfRDn.bk  
    cDir = MacroDir$ & "\" nB}e1 /_y  
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    'Array which will be populated with the list of files to be merged akrCs&Kka5  
    Dim fList() As String, curFile As String
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    GetFileList( cDir, fList ) 3It8&x:  
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    Print "" W["HDR  
    Print "Files found for merging:" i\Q":4  
    For Each curFile In fList 9>zDJx  
        Print Chr(9) & curFile ]Qy,#p'~&H  
    Next *hl<Y,W(  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. k#-[ M.i  
    Dim nameArray() As String, sampName As String (aBP|rxg  
    nameArray = Split(fList(0)," 0-0.txt") *q[^Q'jnN  
    sampName  = nameArray(0) T)O]:v  
    Print "" )rS^F<C  
    Print "Sample name: " & Chr(9) & sampName \ /sF:~=  
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    'Open an output file and write the FRED header data s~#
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    Dim outFile As String `oan,wq+  
    outFile = cDir & sampName & "_FRED.txt"  MbM:3  
    Open outFile For Output As #1
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    Print #1, "type bsdf_data" -1#e^9Ve\  
    Print #1, "format angles=deg bsdf=value scale=1" mr
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    'Loop the file list, skip the two header lines and write the remaining data to file p$&_fzb  
    Dim lineArray() As String, curLine As Long `~sf}S :  
    For Each curFile In fList >l6XZQ >  
        Print "Merging data from file " & curFile v UJ sFR  
        ReadFile( cDir & curFile, lineArray ) X6n|Xq3k  
        For curLine = 2 To UBound(lineArray) xXl$Mp7  
            Print #1, lineArray(curLine) _dz:\v  
        Next zX006{vig  
    Next BZ8h*|uT"  
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    'Close the output file u_$6LEp-  
    Close #1 wpJ^}+kF  
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    Print "Finished merging RPC data for sample " & sampName *NKC\aV`0  
    Print "FRED formatted data file: " & Chr(9) & outFile PLlx~A  
End Sub +/1P^U /  
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'Utility function to read the contents of a file into an array of strings. D<$j`r  
Function ReadFile(ByVal fileName As String, _ Vz+=ZK r5  
                  ByRef lineArray() As String) As Long xNkwTDN5  
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    ReadFile = -1 9'1;-^U1  
    Dim oFSO As Object =iPd@f"$  
    Set oFSO = CreateObject("Scripting.FileSystemObject") f^>lObvd  
    Erase lineArray 1L(Nfkh  
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    Dim fid As Long +;4AG::GN  
    If oFSO.fileexists( fileName ) Then co(fGp#!  
        fid = FreeFile() UeC%Wa<[  
        Open fileName For Input As fid \5v=pDd4g  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) 9X*eE  
        Close fid Vf\?^h(tP  
    End If '44nk(hM69  
    Set oFSO = Nothing *RqO3=  
    Return UBound( lineArray ) 9x 6ca  
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End Function y("0Xve  
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Sub GetFileList( ByVal in_dir As String, _ 'AlSq:gZ  
                 ByRef in_flist() As String ) 5)o-]S>  
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    'Redimension the file list array SS<+fWXE  
    Erase in_flist D;#Yn M3  
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    'Tracks how many files are found ,BN}H-W\2  
    Dim fCount As Long 86) 3XE[5  
    fCount = 0 )Q pP1
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    'Recurse directory and search for text files 0m| Gp  
    Dim f As String ,Elga}7u  
    f = Dir$(in_dir & "*.txt") c75vAKZ2  
    While f <> "" *fy`
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        ReDim Preserve in_flist(fCount) (nZ=9+j]d  
        in_flist(fCount) = f 9j>sRE1  
        fCount += 1 R`3>0LrC8  
        f = Dir$() `8b6 /  
    Wend K]]rOF  
    ReDim Preserve in_flist(fCount-1) oG_'<5Bv>  
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End Sub {<{G 1y~  
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