[技术]RPC Photonics扩散片BSDF [复制链接]

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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。 B4yh3cf  
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背景： D.*>;5:0'  
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。 /\E [  
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。 )acV-+{  
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步骤 |!LnAh  
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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。 ?QpNjsF  
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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） %fhNxR  
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 AhxGj
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例如下所示： #w>~u2W  
Sample name:  EDF-C1-56 v01#>,R  
Merging data from file EDF-C1-56 0-0.txt &5Y_>{,  
Finished merging RPC data for sample EDF-C1-56 Gt~JA0+C)7  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt {1~T]5  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 :ejJV 6.  
a. 创建一个新的散射库 uLVBM]Qj  
b. 散射模型命名 *YvRNHP  
c. 改变散射模型为“Tabulated BSDF”. x(~<tX~  
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 ） HI!4  
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。 mX\ ;
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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， wss?|XCI  
g. 点击OK M"wue*&  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 p2d\ZgWD=)  
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脚本代码： YD&_^3-XM  
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'#Language "WWB-COM" D7Zm2Kj  
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Option Explicit -t3i^&fj8  
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Sub Main PW)aLycPK  
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    'Cleanup T+CajSV  
    ClearOutputWindow() %l$W*.j|;  
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    Print "Merging RPC Photonics BSDF Data Files" m,tXE%l  
    SetTextColor(255,0,0)  CL3xg)x6  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." u%2KwRQ  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." v?j!&d>  
    SetTextColor(0,0,0) ([LIjaoi  
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    'Current directory of this script (should be the same as the text files being merged) 3!#/k+,C  
    Dim cDir As String JwP:2-o  
    cDir = MacroDir$ & "\" w*~Tm>U  
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    'Array which will be populated with the list of files to be merged r<yhI>>;<  
    Dim fList() As String, curFile As String I3)Zr+  
    GetFileList( cDir, fList ) ?L|yaC~  
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    Print "" IZNOWX|Z;  
    Print "Files found for merging:" x"\
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    For Each curFile In fList tZ8e`r*  
        Print Chr(9) & curFile A 's-'8m  
    Next eOY^$#Y  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. /A07s[L  
    Dim nameArray() As String, sampName As String m5-9yQ=.  
    nameArray = Split(fList(0)," 0-0.txt") :zp`6l  
    sampName  = nameArray(0) VKuAO$s$  
    Print "" tT5pggml  
    Print "Sample name: " & Chr(9) & sampName {fz$Z!8-  
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    'Open an output file and write the FRED header data aj8Rb&  
    Dim outFile As String 0k[2jh  
    outFile = cDir & sampName & "_FRED.txt" Eipp~GD  
    Open outFile For Output As #1 o8S"&O ?  
    Print #1, "type bsdf_data" # cFr   
    Print #1, "format angles=deg bsdf=value scale=1" o"q+,"QL  
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    'Loop the file list, skip the two header lines and write the remaining data to file 5%i:4sMx *  
    Dim lineArray() As String, curLine As Long xJhU<q~?  
    For Each curFile In fList G|4^_`-  
        Print "Merging data from file " & curFile \b8\Ug~t  
        ReadFile( cDir & curFile, lineArray ) npH?4S-8G  
        For curLine = 2 To UBound(lineArray) ?F@%S3h.  
            Print #1, lineArray(curLine) O)#U ^  
        Next -5Utlos  
    Next
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    'Close the output file &ab|2*3?X  
    Close #1 P:{<*`q  
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    Print "Finished merging RPC data for sample " & sampName !G?gsW0\h  
    Print "FRED formatted data file: " & Chr(9) & outFile qVgd(?hJ#  
End Sub +U8Bln  
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'Utility function to read the contents of a file into an array of strings. &M[f&_"8Q  
Function ReadFile(ByVal fileName As String, _ T*>`,}J  
                  ByRef lineArray() As String) As Long wL{qD  
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    ReadFile = -1 w{,4rk;Hr  
    Dim oFSO As Object 8]"(!i_;)  
    Set oFSO = CreateObject("Scripting.FileSystemObject") )K]pnH|  
    Erase lineArray UY>v"M  
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    Dim fid As Long s] au/T6b  
    If oFSO.fileexists( fileName ) Then {"}V&X160o  
        fid = FreeFile() ;hDa@3|]34  
        Open fileName For Input As fid Q!'qC*Gyfn  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) GDhM<bVqM*  
        Close fid q mQfLz7&x  
    End If -_0?_Cb  
    Set oFSO = Nothing bbN%$/d  
    Return UBound( lineArray ) ?J!
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End Function m7jA ,~O  
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Sub GetFileList( ByVal in_dir As String, _ 7+,vTsCd  
                 ByRef in_flist() As String ) xvm5  
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    'Redimension the file list array vNDu9ovs-  
    Erase in_flist P~ 0Jg# V  
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    'Tracks how many files are found 1|| nR4yK  
    Dim fCount As Long A o/vp-e  
    fCount = 0 m VxO$A,  
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    'Recurse directory and search for text files ]\c,BWC@e  
    Dim f As String PlxIfL  
    f = Dir$(in_dir & "*.txt") Te
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    While f <> "" %w}gzxN^  
        ReDim Preserve in_flist(fCount) uh3)0.nR  
        in_flist(fCount) = f b>=_*nw9  
        fCount += 1 [c&B|h=>  
        f = Dir$()
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    Wend `:|@Zln  
    ReDim Preserve in_flist(fCount-1) jgu*Y{ocm  
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End Sub OSDy'@