[分享]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。 LOX[h$
 
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背景： Ufv{6"sH  
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。 UIL5K 
 
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。 L-Xd3RCD  
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步骤 Ki^m&P   
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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。 b/"gkFe#  
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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） <z#r3J  
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 /_*:  
例如下所示： kX'1.<[  
Sample name:  EDF-C1-56 B6 x5E  
Merging data from file EDF-C1-56 0-0.txt L0UAS'hf  
Finished merging RPC data for sample EDF-C1-56 KFAB  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt }.NR+:0  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 3Nr8H.u&q  
a. 创建一个新的散射库 x4*8q/G=D  
b. 散射模型命名 r4J4|&ym  
c. 改变散射模型为“Tabulated BSDF”. GE Xz)4[  
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 ） A!Ng@r  
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。 xE9^4-Px*  
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， -3wg9uZ&  
g. 点击OK &VR<'^>  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 5irewh'R  
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脚本代码： ^P"
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'#Language "WWB-COM" ^[&*B#(  
R j(="+SPj  
Option Explicit xW/JItF  
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Sub Main twf;{lZ(  
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    'Cleanup r\@"({q}_-  
    ClearOutputWindow() M[<O]p6  
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    Print "Merging RPC Photonics BSDF Data Files" zLOmtZ(['  
    SetTextColor(255,0,0) LMsbTF@E  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." Y +HVn0~qz  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." 0Yfk/}5  
    SetTextColor(0,0,0) N%y%)MI8  
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    'Current directory of this script (should be the same as the text files being merged) DMfC(w.d  
    Dim cDir As String 9tl Fbu  
    cDir = MacroDir$ & "\" GZI[qKDfB  
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    'Array which will be populated with the list of files to be merged pRMM1&H  
    Dim fList() As String, curFile As String tSYe
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    GetFileList( cDir, fList ) %m+ZrH(  
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    Print "" <u->hT  
    Print "Files found for merging:" eC[g"Ef  
    For Each curFile In fList uKpl+>  
        Print Chr(9) & curFile )byQ=-<1  
    Next oJ6 d:  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. [C771~BL>  
    Dim nameArray() As String, sampName As String Bfi9%:eG  
    nameArray = Split(fList(0)," 0-0.txt") FuEHO6nx  
    sampName  = nameArray(0) e=8ccj  
    Print "" -7=pb#y  
    Print "Sample name: " & Chr(9) & sampName +Tq _n@  
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    'Open an output file and write the FRED header data QfcW  
    Dim outFile As String v^,A~oe`t  
    outFile = cDir & sampName & "_FRED.txt"
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    Open outFile For Output As #1 ~Ja>x`5  
    Print #1, "type bsdf_data" HK2`.'D  
    Print #1, "format angles=deg bsdf=value scale=1" Qf=%%5+?8  
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    'Loop the file list, skip the two header lines and write the remaining data to file Yd/qcC(&  
    Dim lineArray() As String, curLine As Long HL88  
    For Each curFile In fList v]!|\]  
        Print "Merging data from file " & curFile WY*}
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        ReadFile( cDir & curFile, lineArray ) _r^&.'q  
        For curLine = 2 To UBound(lineArray) ^QYI`u`4  
            Print #1, lineArray(curLine) ?#FAa,  
        Next {K[+nX=#  
    Next _fMooI)U1  
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    'Close the output file ^.-P]I]  
    Close #1 Dtr'X@U  
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    Print "Finished merging RPC data for sample " & sampName @B&hR} 4  
    Print "FRED formatted data file: " & Chr(9) & outFile F},JP'\X  
End Sub #jDO?Y Sa  
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'Utility function to read the contents of a file into an array of strings. 9wtl|s%A%  
Function ReadFile(ByVal fileName As String, _ <D&75C#  
                  ByRef lineArray() As String) As Long v- {kPc=:#  
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    ReadFile = -1 !w
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    Dim oFSO As Object Y61E|:fV!  
    Set oFSO = CreateObject("Scripting.FileSystemObject") Aq";z.gi+  
    Erase lineArray F"0tv$  
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    Dim fid As Long g|nPr)<  
    If oFSO.fileexists( fileName ) Then ja9y  
        fid = FreeFile() &JF^a  
        Open fileName For Input As fid B<0lif|  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) }F1^gN&QF  
        Close fid Z ,T TI>P  
    End If %/sf#8^m  
    Set oFSO = Nothing nY~CAo/:  
    Return UBound( lineArray ) cFH,fj  
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End Function xNm<` Y?  
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Sub GetFileList( ByVal in_dir As String, _ 3J:!8Gmk  
                 ByRef in_flist() As String ) kM9E)uT>(<  
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    'Redimension the file list array v$,9l+p/  
    Erase in_flist ^l iyWl  
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    'Tracks how many files are found ]INbRytvc  
    Dim fCount As Long cdEZ Y  
    fCount = 0 t`Hwq   
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    'Recurse directory and search for text files 7v=Nh  
    Dim f As String =o5hD,>e  
    f = Dir$(in_dir & "*.txt") U` bvv'38#  
    While f <> "" 3S <5s}  
        ReDim Preserve in_flist(fCount) Ag?@fuk$J  
        in_flist(fCount) = f 2I#fwsb  
        fCount += 1 A\ LTAp(I  
        f = Dir$() %q:V  
    Wend 8-+IcyUza  
    ReDim Preserve in_flist(fCount-1) vU~#6sl  
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End Sub ZA:YoiaC#  
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