[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： Zc~7R`v7}  
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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。 ^ l]!'"  
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背景： =exCpW>  
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。 "73y}'  
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 { oVz],  
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步骤 JL87a^ro  
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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。 cl^UFlf[  
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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） w
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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 2v ~8fr4
  
例如下所示： 1sj7]G]`
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Sample name:  EDF-C1-56 @9 S ::  
Merging data from file EDF-C1-56 0-0.txt }VJ>}i*  
Finished merging RPC data for sample EDF-C1-56 VX.LL 5  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt EWDsBNZaI  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 49*f=gpGj2  
a. 创建一个新的散射库 Q;3`T7  
b. 散射模型命名 n>.@@  
c. 改变散射模型为“Tabulated BSDF”. \2y/:  
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 ） *bFWNJ}`q  
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。 S,:!H@~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， wd*B3  
g. 点击OK ZiuD0#"!  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 7/<~s]D[%  
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脚本代码： kQ\ $0=6N9  
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'#Language "WWB-COM" 3'.3RKV  
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Option Explicit Lf%3-P  
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Sub Main Lld45Bayb  
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    'Cleanup Jp"29 )w  
    ClearOutputWindow() eWv:wNouk  
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    Print "Merging RPC Photonics BSDF Data Files" BT[|f[1  
    SetTextColor(255,0,0) ASy?^Jrs5  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." apm%\dN  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." GZaB z#U  
    SetTextColor(0,0,0) |E6_TZ#=  
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    'Current directory of this script (should be the same as the text files being merged) y$7Ys:R~  
    Dim cDir As String >A{Dpsi\  
    cDir = MacroDir$ & "\" UeFJ5n'x:  
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    'Array which will be populated with the list of files to be merged ldTXW(^j  
    Dim fList() As String, curFile As String Rf4K Rhi  
    GetFileList( cDir, fList ) H3$py|}lL  
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    Print "" F,S)P`?  
    Print "Files found for merging:" b(N\R_IQ~  
    For Each curFile In fList ShC$ue?Q  
        Print Chr(9) & curFile z**2-4 z  
    Next w3q'n%  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. h9 DUS,G9,  
    Dim nameArray() As String, sampName As String F&!vtlV)  
    nameArray = Split(fList(0)," 0-0.txt") cy@Ri#  
    sampName  = nameArray(0) sTP\}  
    Print "" t!3s@  
    Print "Sample name: " & Chr(9) & sampName R4 eu,,J  

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    'Open an output file and write the FRED header data 4Lg ,J9  
    Dim outFile As String  I\_2=mL  
    outFile = cDir & sampName & "_FRED.txt" 99*k&mb  
    Open outFile For Output As #1 py\:u5QS  
    Print #1, "type bsdf_data" $)NS]wJ]3  
    Print #1, "format angles=deg bsdf=value scale=1" sm'_0EUg  
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    'Loop the file list, skip the two header lines and write the remaining data to file v@QnS  
    Dim lineArray() As String, curLine As Long N4,oO H~  
    For Each curFile In fList mOj;0 R  
        Print "Merging data from file " & curFile Q(-&}cY  
        ReadFile( cDir & curFile, lineArray ) Z:^#9D{  
        For curLine = 2 To UBound(lineArray) IH=$ wc  
            Print #1, lineArray(curLine) +pG+ xI  
        Next =5*Wu+S4r  
    Next
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    'Close the output file &!4E3&+2m  
    Close #1 EGgw#JAi#t  
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    Print "Finished merging RPC data for sample " & sampName rK'Lvt@w  
    Print "FRED formatted data file: " & Chr(9) & outFile hK)'dG*  
End Sub (U#,;  
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'Utility function to read the contents of a file into an array of strings. octQ[QXo#  
Function ReadFile(ByVal fileName As String, _ RK-bsf  
                  ByRef lineArray() As String) As Long O^CBa$  
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    ReadFile = -1 mW!n%f  
    Dim oFSO As Object k^|z.$+  
    Set oFSO = CreateObject("Scripting.FileSystemObject") !HU$V9C  
    Erase lineArray Htr]_<@  
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    Dim fid As Long wipl5O@L  
    If oFSO.fileexists( fileName ) Then !%M,x~H  
        fid = FreeFile() u-&V, *3l  
        Open fileName For Input As fid D$4GNeB+#  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) &'i_A%V  
        Close fid MzUKp"  
    End If zAM9%W2v_  
    Set oFSO = Nothing Nb:j]U  
    Return UBound( lineArray ) >b"@{MZ@t  
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End Function ]
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Sub GetFileList( ByVal in_dir As String, _ !yj1X Ar  
                 ByRef in_flist() As String ) IWi0? V  
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    'Redimension the file list array Ht+roY  
    Erase in_flist :_i1gY)  
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    'Tracks how many files are found -"ZNkC=
 
    Dim fCount As Long =%I[o=6  
    fCount = 0 yx`@f8Kr  
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    'Recurse directory and search for text files 32+N?[9 *  
    Dim f As String /Z*$k{qIR&  
    f = Dir$(in_dir & "*.txt") XelFGTE  
    While f <> "" ynra%"sd  
        ReDim Preserve in_flist(fCount) &u|t{C#0  
        in_flist(fCount) = f vh"';L_*37  
        fCount += 1 U7fpaxc-  
        f = Dir$() Mfz(%F|<  
    Wend V9<E`C  
    ReDim Preserve in_flist(fCount-1) OO/>}? ob  
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End Sub +Q_xY>ej  
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