[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： [) 0JI6  
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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。 SHs [te[  
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背景： `*[\b9>  
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。 tH&eKM4
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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。 4lR+nmAZ  
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步骤 g)\Tex<  
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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。 p+<qI~  
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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） xI<B)6D;f  
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 sxA]o|  
例如下所示： ;~DrsQb  
Sample name:  EDF-C1-56 "=n%L +6%  
Merging data from file EDF-C1-56 0-0.txt %TRJ  
Finished merging RPC data for sample EDF-C1-56 [T4{K&  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt WMnSkO  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 x1Y/^ks@2  
a. 创建一个新的散射库 @GD $KR9  
b. 散射模型命名 BJ]L@L%  
c. 改变散射模型为“Tabulated BSDF”. Y'jgp Vt  
d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） zRmVV}b  
e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 AA)pV-  
f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， -fV\JJ  
g. 点击OK % >a /m.$  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 k>Fw2!mA^  
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脚本代码： Xs|d#WbX  
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'#Language "WWB-COM" g]JRAM  
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Option Explicit [kpQ:'P3
 
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Sub Main l%('5oz@\  
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    'Cleanup a * CXg.i  
    ClearOutputWindow() ZvQZD=,F  
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    Print "Merging RPC Photonics BSDF Data Files" -xLK/QAL  
    SetTextColor(255,0,0) x^_c4,i)  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." uPbdzUk$  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." y{<js!au  
    SetTextColor(0,0,0) O"|d~VQ  
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    'Current directory of this script (should be the same as the text files being merged) R\X;`ptT  
    Dim cDir As String : O@(Sv  
    cDir = MacroDir$ & "\" 8+7*> FD)1  
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    'Array which will be populated with the list of files to be merged -K$ugDi  
    Dim fList() As String, curFile As String i;/;zG^=_  
    GetFileList( cDir, fList ) J=8Y D"1  
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    Print "" t'J4zV  
    Print "Files found for merging:" rNicg]:\x  
    For Each curFile In fList **z^aH?B2  
        Print Chr(9) & curFile ^fsC]9NS  
    Next 6:8Nz   
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. x!W5'DO  
    Dim nameArray() As String, sampName As String G9xO>Xp^Al  
    nameArray = Split(fList(0)," 0-0.txt") Het>G{  
    sampName  = nameArray(0) 6Y6t.j0vN.  
    Print "" gBWr)R  
    Print "Sample name: " & Chr(9) & sampName a
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    'Open an output file and write the FRED header data 9bRUN<  
    Dim outFile As String 6{udNv X  
    outFile = cDir & sampName & "_FRED.txt" m5] a  
    Open outFile For Output As #1 _,v?rFLE  
    Print #1, "type bsdf_data" nO'C2)bBSG  
    Print #1, "format angles=deg bsdf=value scale=1" YMNLn9  
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    'Loop the file list, skip the two header lines and write the remaining data to file G(shZ=fq  
    Dim lineArray() As String, curLine As Long [~cz|C#  
    For Each curFile In fList ?IS[2 v$  
        Print "Merging data from file " & curFile ?G7*^y&Q  
        ReadFile( cDir & curFile, lineArray ) eHGx00:  
        For curLine = 2 To UBound(lineArray) ]oz>/\!  
            Print #1, lineArray(curLine) @].!}tz  
        Next `'P&={p8  
    Next 3}3b@:<  
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    'Close the output file J(~1mIJjC  
    Close #1 )K::WqR%w)  
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    Print "Finished merging RPC data for sample " & sampName m~W[,7NE0&  
    Print "FRED formatted data file: " & Chr(9) & outFile z0a`*3 -2  
End Sub 1 |)
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'Utility function to read the contents of a file into an array of strings. s S3RK  
Function ReadFile(ByVal fileName As String, _ =\oW{?  
                  ByRef lineArray() As String) As Long   </5  
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    ReadFile = -1 c68y\  
    Dim oFSO As Object (d,OLng  
    Set oFSO = CreateObject("Scripting.FileSystemObject") Q3$DX,8?  
    Erase lineArray J{kS4v*J  
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    Dim fid As Long t;PG  
    If oFSO.fileexists( fileName ) Then j"pyK@v2B  
        fid = FreeFile() /[/{m]  
        Open fileName For Input As fid .!lLj1?p  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) XhWo~zh"  
        Close fid 1=9GV+`n  
    End If CK|AXz+EN  
    Set oFSO = Nothing cH:&S=>h  
    Return UBound( lineArray ) -`z%<)!Y  
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End Function #4"eQ*.*"  
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Sub GetFileList( ByVal in_dir As String, _ R^$EnrY(<  
                 ByRef in_flist() As String ) 1gt 7My  
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    'Redimension the file list array 8:*ZuR|~  
    Erase in_flist D^p)`*  
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    'Tracks how many files are found #D?w,<_8,  
    Dim fCount As Long BNb_i H  
    fCount = 0 M0)0~#?.D  
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    'Recurse directory and search for text files @8a
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    Dim f As String h -091N  
    f = Dir$(in_dir & "*.txt") S5Pn6'w  
    While f <> "" *A}td8(  
        ReDim Preserve in_flist(fCount) _/.VXW  
        in_flist(fCount) = f hBaG*J{  
        fCount += 1 *}Z  
        f = Dir$() Y$)y:.2#  
    Wend QGGBI Ku   
    ReDim Preserve in_flist(fCount-1) dNqj|Vu  
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End Sub Fe$o*r,  
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