[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。 N,'[:{GOY  
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背景： vTe$77n
 
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。 .=et{\  
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。 B.CH9M  
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步骤 V PLC
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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。 gKm@B{rC  
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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） O,V6hU/ *  
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 GDNh?R  
例如下所示： a V+o\fId  
Sample name:  EDF-C1-56 S1x.pLHj8  
Merging data from file EDF-C1-56 0-0.txt B~'VDOG$Z  
Finished merging RPC data for sample EDF-C1-56 Jm*M7gj  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt ,&zjOc_v  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 r=iMo7q  
a. 创建一个新的散射库 `K@df<}%*,  
b. 散射模型命名 ib""Fv7{  
c. 改变散射模型为“Tabulated BSDF”. e!2%ku  
d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） mV! @oNCK  
e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 -KU)7V  
f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， 0
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g. 点击OK }?Yr>ZRi  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值
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脚本代码： DESViQM  
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'#Language "WWB-COM" +=
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Option Explicit _w5~/PbWt  
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Sub Main /
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    'Cleanup #@\NdW\  
    ClearOutputWindow() XnI ;7J  
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    Print "Merging RPC Photonics BSDF Data Files" ?3"D| cS1  
    SetTextColor(255,0,0) BHJ'[{U*w  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." mJDKxgGK  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." fj t_9-.  
    SetTextColor(0,0,0) AZ9\
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    'Current directory of this script (should be the same as the text files being merged) b]g&rwXYt  
    Dim cDir As String _AFt6
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    cDir = MacroDir$ & "\" Ignv|TYG  
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    'Array which will be populated with the list of files to be merged N>nvt.`P  
    Dim fList() As String, curFile As String Dy{`">a  
    GetFileList( cDir, fList ) Uh|__DUkh  
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    Print "" vb"dX0)<  
    Print "Files found for merging:" va/4q+1GfH  
    For Each curFile In fList I\uB"Z{9  
        Print Chr(9) & curFile )Y,?r[4{  
    Next `2mbF^-4  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. R$;&O. 5M  
    Dim nameArray() As String, sampName As String -IEP?NX  
    nameArray = Split(fList(0)," 0-0.txt") P7k$^n  
    sampName  = nameArray(0) ,8"[ /@  
    Print "" 2eR+dT  
    Print "Sample name: " & Chr(9) & sampName "O*W]e  
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    'Open an output file and write the FRED header data ;Y|~!%2~  
    Dim outFile As String } @fu~V/  
    outFile = cDir & sampName & "_FRED.txt" PSQ:'  
    Open outFile For Output As #1 7" STS7_  
    Print #1, "type bsdf_data" FvNSu"O~K1  
    Print #1, "format angles=deg bsdf=value scale=1" R5;eR(24G  
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    'Loop the file list, skip the two header lines and write the remaining data to file 3 cW"VrFy9  
    Dim lineArray() As String, curLine As Long +-!|%jG`%v  
    For Each curFile In fList ?6YUb
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        Print "Merging data from file " & curFile vBYT)S  
        ReadFile( cDir & curFile, lineArray ) B?ob{K@  
        For curLine = 2 To UBound(lineArray) 'GzhZ
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            Print #1, lineArray(curLine) 7fTg97eF  
        Next "QFADk1  
    Next 6p=xgk-q  
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    'Close the output file /e?ux~f|  
    Close #1 9H%xZ(`vN  
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    Print "Finished merging RPC data for sample " & sampName O9=H [b  
    Print "FRED formatted data file: " & Chr(9) & outFile 4Z~Dxo  
End Sub b G5  
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'Utility function to read the contents of a file into an array of strings. 2[&-y[1  
Function ReadFile(ByVal fileName As String, _ ^}7t:  
                  ByRef lineArray() As String) As Long U4L=3T+:[  
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    ReadFile = -1 ftU5A@(T  
    Dim oFSO As Object %PdYv _5  
    Set oFSO = CreateObject("Scripting.FileSystemObject") r\ Yur  
    Erase lineArray f uNXY-;  
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    Dim fid As Long Ru')X{]25  
    If oFSO.fileexists( fileName ) Then <IDzv'  
        fid = FreeFile() v_h*:c  
        Open fileName For Input As fid HeifFJn  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) k\<
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        Close fid wVJFA1  
    End If eL?si!ZL^  
    Set oFSO = Nothing qq_,"~  
    Return UBound( lineArray ) \Y[)bo6s  
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End Function Y <k,E  
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Sub GetFileList( ByVal in_dir As String, _ RZh)0S>J  
                 ByRef in_flist() As String ) N_Ld,J%g  
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    'Redimension the file list array "s<lLgi  
    Erase in_flist v!h-h&p O7  
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    'Tracks how many files are found &p4<@k\L  
    Dim fCount As Long KmOa^vY1.T  
    fCount = 0 5t?2B]  
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    'Recurse directory and search for text files B]F7t4Y!  
    Dim f As String l4reG:uYG  
    f = Dir$(in_dir & "*.txt") R./6Q1  
    While f <> "" Byj~\QMD|  
        ReDim Preserve in_flist(fCount) kD7(}N8YR  
        in_flist(fCount) = f &E`Z_}~  
        fCount += 1 Hll}8d6[  
        f = Dir$() &*GX:0=/>  
    Wend X )s7_  
    ReDim Preserve in_flist(fCount-1) \o)4m[oF  
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End Sub 2vQ^519  
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