[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： m^cr-'  
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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。 (dD+?ZOO  
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背景： ]-"~?  
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。 9
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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。 t"M&Yy  
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步骤 ,jJ&x7ra8  
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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:S/ ?v  
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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） r&sm&4)p-5  
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 5&a4c"fU  
例如下所示： T0BFit6  
Sample name:  EDF-C1-56 3YT>3f!\  
Merging data from file EDF-C1-56 0-0.txt ~]X4ru5,4  
Finished merging RPC data for sample EDF-C1-56 kBolDPvBG  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt Q\>9PKK  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 ,grdl|Dg  
a. 创建一个新的散射库 -JOtvJIQI  
b. 散射模型命名 -oc@$*t  
c. 改变散射模型为“Tabulated BSDF”. zf-)c1$*r  
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 ） g]au|$L4  
e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 /V@~Vlww  
f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， }T=0]u4,  
g. 点击OK cU <T;1VQ  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 R3+y*<<e  
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脚本代码： ,{wA%Oy,  
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'#Language "WWB-COM" I4'mU$)U  
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Option Explicit VZ"W_U,  
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Sub Main P.^%8L  
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    'Cleanup lx9tUTaus/  
    ClearOutputWindow() p)l>bC?3  
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    Print "Merging RPC Photonics BSDF Data Files" t\LAotTF/  
    SetTextColor(255,0,0) _SU%ul  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." ^8dd  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." WrvSYqN  
    SetTextColor(0,0,0) #wz1uw[pI!  
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    'Current directory of this script (should be the same as the text files being merged) b+/XVEsr  
    Dim cDir As String Fy1@B(V%  
    cDir = MacroDir$ & "\" L"|4 v  
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    'Array which will be populated with the list of files to be merged &"!s+_  
    Dim fList() As String, curFile As String 'r`#u@TTZ  
    GetFileList( cDir, fList ) p H&Tb4  
GFM$1}  
    Print "" r&F(VF0 6  
    Print "Files found for merging:" 5 :O7cBr  
    For Each curFile In fList  L~F"  
        Print Chr(9) & curFile }.md$N_F  
    Next z'cVq}vl  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. GilaON*pK.  
    Dim nameArray() As String, sampName As String +#qW 0g  
    nameArray = Split(fList(0)," 0-0.txt") Y1e>P  
    sampName  = nameArray(0) EOqvu=$6  
    Print "" bb<qnB  
    Print "Sample name: " & Chr(9) & sampName &YMz3ugI  
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    'Open an output file and write the FRED header data aH@Ux?-}  
    Dim outFile As String U)IW6)q  
    outFile = cDir & sampName & "_FRED.txt" 7WZ).,qxY  
    Open outFile For Output As #1 zY?GO"U"  
    Print #1, "type bsdf_data" E]zTd$v6  
    Print #1, "format angles=deg bsdf=value scale=1" tK9_]663  
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    'Loop the file list, skip the two header lines and write the remaining data to file _-^bAr`z  
    Dim lineArray() As String, curLine As Long O{b.-<  
    For Each curFile In fList JNY;;9o  
        Print "Merging data from file " & curFile i3C5"\y  
        ReadFile( cDir & curFile, lineArray ) ,E&PIbDL1  
        For curLine = 2 To UBound(lineArray) Wi a%rm  
            Print #1, lineArray(curLine) h\+U+?u  
        Next x13t@b  
    Next S`,(10Y  
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    'Close the output file 8Ar5^.k  
    Close #1 W<Ms0  
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    Print "Finished merging RPC data for sample " & sampName 1pe eecE  
    Print "FRED formatted data file: " & Chr(9) & outFile ?m&?BsW$)  
End Sub J*)Vpk  
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'Utility function to read the contents of a file into an array of strings. |&JCf=  
Function ReadFile(ByVal fileName As String, _ *=]hc@  
                  ByRef lineArray() As String) As Long pJM~'tlHV  
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    ReadFile = -1 ]"'$i4I{R  
    Dim oFSO As Object lq2Ah=FuN  
    Set oFSO = CreateObject("Scripting.FileSystemObject") u,<#z0R|;$  
    Erase lineArray _D%aT6,G+(  
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    Dim fid As Long ,sEu[m  
    If oFSO.fileexists( fileName ) Then 5<o8prtB  
        fid = FreeFile() r:h\{DVf  
        Open fileName For Input As fid 9qIdwDRY  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) 1mT3$Z  
        Close fid #:rywz+  
    End If w+ZeVZv!r  
    Set oFSO = Nothing w2BIf[~t  
    Return UBound( lineArray ) V!!E)I  
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End Function jq6BwUN  
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Sub GetFileList( ByVal in_dir As String, _ 9 yH/5'  
                 ByRef in_flist() As String ) 0(A(Vb5J.T  
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    'Redimension the file list array `% sKF  
    Erase in_flist A%H"a+  
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    'Tracks how many files are found w6C0]vh  
    Dim fCount As Long >kK;IF9h  
    fCount = 0 Ns.b8Y  
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    'Recurse directory and search for text files x!CCSM;q  
    Dim f As String fVCpG~&t  
    f = Dir$(in_dir & "*.txt") g_z%L?N  
    While f <> "" ya7/&Z )0  
        ReDim Preserve in_flist(fCount) <^j,jX  
        in_flist(fCount) = f '~?\NeO=  
        fCount += 1 C3|(XChqC  
        f = Dir$() yp%7zrU  
    Wend c}9.Or`?  
    ReDim Preserve in_flist(fCount-1) 98u$5=Z'/  
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End Sub CBC0X}_`  
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