[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： [KQ6Ta.  
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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。 EBmt9S
 
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背景： (Awm9|.{+  
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。 -DAlRz#d,  
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。 V^~:F  
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步骤 hFBe,'3M  
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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。 "J3x_~,[4m  
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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） \lNN Msd&  
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 HkVB80hv  
例如下所示： /_ajaz%  
Sample name:  EDF-C1-56 uXl3k:_n  
Merging data from file EDF-C1-56 0-0.txt f|oh.z_R  
Finished merging RPC data for sample EDF-C1-56 h zn6kbv  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt ;xn0;V'=  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 p{dj~
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a. 创建一个新的散射库 wwcBsJ1{  
b. 散射模型命名 ku M$UYTTX  
c. 改变散射模型为“Tabulated BSDF”. mRK>U$v  
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 ） _PR4`C*  
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。 f6"Z'{j  
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， \z} Ic%Tp  
g. 点击OK {BU
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5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 +x}<IS8  
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脚本代码： Rbv;?'O$L  
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'#Language "WWB-COM" ~WV"SaA)*U  
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Option Explicit vs{s_T7Mz]  
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Sub Main #C@FYOf*  
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    'Cleanup iO; 7t@]-  
    ClearOutputWindow() "U"Z 3*  
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    Print "Merging RPC Photonics BSDF Data Files" Dv`c<+q(#  
    SetTextColor(255,0,0) D^;Uq8NDKq  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." A&jlizN7  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." RViuJ;  
    SetTextColor(0,0,0) U:_^#\p  
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    'Current directory of this script (should be the same as the text files being merged) '1/i"yoW  
    Dim cDir As String 7. ;3e@s  
    cDir = MacroDir$ & "\" D.XvG_  
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    'Array which will be populated with the list of files to be merged R*r#E{!V;  
    Dim fList() As String, curFile As String P7/X|M z  
    GetFileList( cDir, fList ) _zMW=nypdx  
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    Print "" k|d+#u[Mj@  
    Print "Files found for merging:" hY8reQp1  
    For Each curFile In fList SasJic2M  
        Print Chr(9) & curFile *-p}z@8  
    Next :*\Pn!r  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. @f_+=}|dc  
    Dim nameArray() As String, sampName As String /&94 eC  
    nameArray = Split(fList(0)," 0-0.txt") 6)Lk-D  
    sampName  = nameArray(0)  ;4~hB  
    Print "" Y:a]00&)#Y  
    Print "Sample name: " & Chr(9) & sampName pz>>)c`  
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    'Open an output file and write the FRED header data czd~8WgOa  
    Dim outFile As String E< fVZ,  
    outFile = cDir & sampName & "_FRED.txt" Tnm.A?  
    Open outFile For Output As #1 83q6Sv  
    Print #1, "type bsdf_data" ~qOa\#x_  
    Print #1, "format angles=deg bsdf=value scale=1" +srGN5!  
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    'Loop the file list, skip the two header lines and write the remaining data to file OI*Xt`  
    Dim lineArray() As String, curLine As Long E?0%Z&1h  
    For Each curFile In fList 0"bcdG<}  
        Print "Merging data from file " & curFile @<&m|qtMsz  
        ReadFile( cDir & curFile, lineArray ) ,nm*q#R,0  
        For curLine = 2 To UBound(lineArray) ~Jz6O U*z  
            Print #1, lineArray(curLine) 8-77d^cprR  
        Next HA>OkA/  
    Next HC,Se.VYS  
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    'Close the output file 9qG6Pb  
    Close #1 )Z9>$V$j  
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    Print "Finished merging RPC data for sample " & sampName )P|),S,;Z  
    Print "FRED formatted data file: " & Chr(9) & outFile <W$mj04@  
End Sub ,DkNLE  
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'Utility function to read the contents of a file into an array of strings. Q$@I"V&G.  
Function ReadFile(ByVal fileName As String, _ y_lU=(%
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                  ByRef lineArray() As String) As Long YcpoL@ab  
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    ReadFile = -1 6j
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    Dim oFSO As Object g7W"  
    Set oFSO = CreateObject("Scripting.FileSystemObject") 7O-x<P;  
    Erase lineArray dNeVo|Y~h  
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    Dim fid As Long pg)WKbV  
    If oFSO.fileexists( fileName ) Then :X (=z;B;N  
        fid = FreeFile() ;@|n @ax  
        Open fileName For Input As fid kL"2=7m;  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) |_@>*Vmg  
        Close fid Z}Ft:7   
    End If @r/nF5  
    Set oFSO = Nothing b}TS0+TF  
    Return UBound( lineArray ) ?2Py_gkf  
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End Function P\rg" 3  
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Sub GetFileList( ByVal in_dir As String, _ vnZC,J `  
                 ByRef in_flist() As String ) @QPz#-  
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    'Redimension the file list array .5ha}=
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    Erase in_flist p4 ^yVa  
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    'Tracks how many files are found N U
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    Dim fCount As Long QX'qyojxN  
    fCount = 0 lp%pbx43s  
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    'Recurse directory and search for text files ^yN&ZI3P&  
    Dim f As String t=W}SH  
    f = Dir$(in_dir & "*.txt") 57']#j#"hj  
    While f <> "" -fW*vE:  
        ReDim Preserve in_flist(fCount) hy"\RW  
        in_flist(fCount) = f 9Y_HyOZ*GX  
        fCount += 1 K/yxE|w<  
        f = Dir$() :(*V?WI  
    Wend )cMh0SGcM1  
    ReDim Preserve in_flist(fCount-1) &powy7rR  
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End Sub 3K0A)W/YEs  
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