[技术]RPC Photonics扩散片BSDF [复制链接]

摘要： n1ly y0%u  
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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。 ~Y|*`C_)  
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背景： >8WP0Qx/  
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。 eYN5;bx)W  
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。 g#Sl
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步骤 A OISs4  
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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。 T 6)bD&  
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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） 9Uj$K>:  
3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 +av@$}  
例如下所示： ts\5uiB<%  
Sample name:  EDF-C1-56 6kpg+{;  
Merging data from file EDF-C1-56 0-0.txt 1*'HL#  
Finished merging RPC data for sample EDF-C1-56 nExU#/*~^  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt u%}nw :>  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 D^l%{IG
 
a. 创建一个新的散射库 g!lWu[d  
b. 散射模型命名 Cs9.&Y  
c. 改变散射模型为“Tabulated BSDF”. W+UfGk}A  
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 ） iBF|&h(\  
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。 D8Ykg >B;&  
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， #gz M|  
g. 点击OK n>ULRgiT:o  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 o]yl;I  
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脚本代码： . $BUw  
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'#Language "WWB-COM" gp>3I!bo[K  
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Option Explicit s
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Sub Main &dM. d!  
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    'Cleanup c3jx+Q  
    ClearOutputWindow() OGK}EI  
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    Print "Merging RPC Photonics BSDF Data Files" sDPs G5q<  
    SetTextColor(255,0,0) W42iu"@  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." B"h#C!E  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." NQBpX  
    SetTextColor(0,0,0) D{GfLib"U  
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    'Current directory of this script (should be the same as the text files being merged) B2
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    Dim cDir As String 'u*DA|HC  
    cDir = MacroDir$ & "\" y
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    'Array which will be populated with the list of files to be merged B3We|oe!  
    Dim fList() As String, curFile As String }Yb[  
    GetFileList( cDir, fList ) 4Jp:x
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    Print "" 4!Fo$9  
    Print "Files found for merging:" |iakz|])  
    For Each curFile In fList [xSF6  
        Print Chr(9) & curFile ) i;1*jK  
    Next u+Y\6~
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. _Gn2o2T  
    Dim nameArray() As String, sampName As String Q-_N2W?  
    nameArray = Split(fList(0)," 0-0.txt") ]~9tYn  
    sampName  = nameArray(0) '))0Lh l  
    Print "" Q_"]+i]s@  
    Print "Sample name: " & Chr(9) & sampName uGwm r  
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    'Open an output file and write the FRED header data ff]6aR/ UQ  
    Dim outFile As String BF\XEm?!  
    outFile = cDir & sampName & "_FRED.txt" /sx@$cvW  
    Open outFile For Output As #1 |c
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    Print #1, "type bsdf_data" mk;&yh  
    Print #1, "format angles=deg bsdf=value scale=1" |,S+@"0#  
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    'Loop the file list, skip the two header lines and write the remaining data to file ?9!6%]2D  
    Dim lineArray() As String, curLine As Long Nv#t:J9f  
    For Each curFile In fList /5S30 |K  
        Print "Merging data from file " & curFile 9]k @Q_  
        ReadFile( cDir & curFile, lineArray ) v[ .cd*b  
        For curLine = 2 To UBound(lineArray) h{%nC>m;  
            Print #1, lineArray(curLine) /KFfU1
 
        Next nEJq_  
    Next }q_<_lQ  
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    'Close the output file y&6FybIz  
    Close #1 WffQ:L?  
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    Print "Finished merging RPC data for sample " & sampName !\-{D$E?H  
    Print "FRED formatted data file: " & Chr(9) & outFile `.E[}W
  
End Sub HJ9Kz^TnC  
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'Utility function to read the contents of a file into an array of strings. Lf16j*}-Q  
Function ReadFile(ByVal fileName As String, _ Z/W:97M  
                  ByRef lineArray() As String) As Long *1uKr9  
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    ReadFile = -1 MV5_L3M  
    Dim oFSO As Object '.on)Zd.  
    Set oFSO = CreateObject("Scripting.FileSystemObject") U_Vs.M.p  
    Erase lineArray C_( *>!Z%  
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    Dim fid As Long }u\])I3  
    If oFSO.fileexists( fileName ) Then )Q=_0;#;k  
        fid = FreeFile() 6"wlg!k8  
        Open fileName For Input As fid rA3$3GLQ-  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) YJ^] u}  
        Close fid gR&Q3jlIV  
    End If 'H3^e}   
    Set oFSO = Nothing v|gw9  
    Return UBound( lineArray ) 0@[$lv;OS  
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End Function eX?OYDDC0j  
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Sub GetFileList( ByVal in_dir As String, _ qz+dmef  
                 ByRef in_flist() As String ) B\=L3eL<D  
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    'Redimension the file list array _G[g;$<  
    Erase in_flist Dl<bnx;0  
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    'Tracks how many files are found -?H#LUk  
    Dim fCount As Long 2V"B:X\  
    fCount = 0 Q!o'}nA  
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    'Recurse directory and search for text files .~)q};Z  
    Dim f As String ],>@";9u"  
    f = Dir$(in_dir & "*.txt") 4qO+_!x{)  
    While f <> "" "~#3&3HVS  
        ReDim Preserve in_flist(fCount) Tre]"2l  
        in_flist(fCount) = f EOIN^4V"  
        fCount += 1 :WjpzgPuN  
        f = Dir$() \MsTB|Z  
    Wend +Jlay1U&  
    ReDim Preserve in_flist(fCount-1) yg`j-9[8  
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End Sub |EIng0a