[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： nX^1$')gp  
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RPC Photonics公司有高品质的的工程漫射体BSDF测试数据，但它对于FRED帮助甚少，下面这个步骤描述了如何利用FRED脚本转换RPC Photonics提供的TXT文件，并将数据直接应用到FRED的Tabulated scatter 散射模型。 3A,rHYS  
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背景： Y]N,.pv=  
Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术，可以解决其他技术的不足，大大改善了诸如光刻系统、有效固态照明，显示，背光，显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体（Engineered DiffusersTM）的新概念，与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同，工程漫射体要求对于每个散射中心，通常为微透镜单元，都进行控制。例如全息漫射体可以视为一组随机排列的透镜，但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制：而无法单独操控每个微透镜单元，这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面，在工程漫射体中，每个微透镜单元形成漫射体，由其凹形纵断面和在阵列中的位置所确定。同时，为了确保漫射体不受输入光束变化的影响，并且不产生衍射效果，微透镜单元的分布是随机的，根据产生相应的光束形状函数所选取的概率分布函数来确定。因此，工程漫射体同时保留了随机与确定性漫射体的优点，从而实现高性能的光束整形功能。
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FRED是美国Photon Engineering 公司开发的光学工程仿真软件，其在杂散光分析中独特的算法、高效的准确性，使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 ;AIc?Cg  
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步骤 B=X,7  
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1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下，选择“Raw data”文件。 --fFpM3EvS  
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2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。（脚本代码放在了本文的最后） z0bJ?~w,  
3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 2i7e
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例如下所示： '91".c,3?  
Sample name:  EDF-C1-56 wRtZ`o  
Merging data from file EDF-C1-56 0-0.txt P"3*lk+w  
Finished merging RPC data for sample EDF-C1-56 7&B$HZ  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt j1-,Sqi  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 ZA(T  
a. 创建一个新的散射库 cz/Q/%j$/  
b. 散射模型命名 MYLsHIPC  
c. 改变散射模型为“Tabulated BSDF”. ycAKK?O*  
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 ） WYrI|^[>  
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。 bb-qO#E  
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， EU-]sTJLF  
g. 点击OK k2 Q qZxm!  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 $`VFdAe  
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脚本代码： 6oD\-H  
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'#Language "WWB-COM" NbRn*nb/T  
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Option Explicit -&2B@]
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Sub Main ^aZAw%K  
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    'Cleanup %9v@0}5V  
    ClearOutputWindow() FFKGd/:!  
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    Print "Merging RPC Photonics BSDF Data Files"  vZj`|  
    SetTextColor(255,0,0) O) atNE  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." ~b~2 >c9  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." ,u9M<B<F  
    SetTextColor(0,0,0) @A<PkpNL  
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    'Current directory of this script (should be the same as the text files being merged) 790-)\:CY  
    Dim cDir As String ^P'{U26  
    cDir = MacroDir$ & "\" ]D2udeg  
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    'Array which will be populated with the list of files to be merged n(seNp%_  
    Dim fList() As String, curFile As String IiBD?}  
    GetFileList( cDir, fList ) }J:+{4Yn  
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    Print "" 81LNkE,  
    Print "Files found for merging:" NB_)ZEmF  
    For Each curFile In fList 2d>hi32I
 
        Print Chr(9) & curFile cvd\/pG)  
    Next q@hzo>[  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. b75$?_+  
    Dim nameArray() As String, sampName As String }Z-Z|G)#  
    nameArray = Split(fList(0)," 0-0.txt") wIB`%V  
    sampName  = nameArray(0) `o]g~AKX  
    Print "" 'B5^P  
    Print "Sample name: " & Chr(9) & sampName q#w8wH"  
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    'Open an output file and write the FRED header data uc7Eq45  
    Dim outFile As String u9+kLepOT  
    outFile = cDir & sampName & "_FRED.txt" 8lF\v/vN  
    Open outFile For Output As #1 66x?A0P  
    Print #1, "type bsdf_data" mm[2wfT
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    Print #1, "format angles=deg bsdf=value scale=1" G;NF5`*4mc  
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    'Loop the file list, skip the two header lines and write the remaining data to file t\P<X^d%  
    Dim lineArray() As String, curLine As Long osARA3\Xt  
    For Each curFile In fList c;0Vs,DUmG  
        Print "Merging data from file " & curFile b45|vX+j  
        ReadFile( cDir & curFile, lineArray ) css64WX^0c  
        For curLine = 2 To UBound(lineArray) K~=UUB  
            Print #1, lineArray(curLine) !`1'2BC  
        Next 9O{b]=>wq  
    Next @%k}FL=:t(  
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    'Close the output file nJ4pTOc  
    Close #1 /~*_x=p:  
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    Print "Finished merging RPC data for sample " & sampName vAY,E=&XvM  
    Print "FRED formatted data file: " & Chr(9) & outFile 3rLTF\  
End Sub N7E$G{T
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'Utility function to read the contents of a file into an array of strings. ljl^ GFo  
Function ReadFile(ByVal fileName As String, _ 6T 8!xyi-+  
                  ByRef lineArray() As String) As Long W>-Et7&2  
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    ReadFile = -1 4DZ-bt'  
    Dim oFSO As Object 0TpK#OlI|c  
    Set oFSO = CreateObject("Scripting.FileSystemObject") uqz]J$
 
    Erase lineArray ^B8b%'\  
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    Dim fid As Long `al<(FwGE  
    If oFSO.fileexists( fileName ) Then )95f*wte  
        fid = FreeFile() @gY)8xMbA  
        Open fileName For Input As fid lHgs;>U$  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) quY:pqG38q  
        Close fid %v20~xW:o  
    End If Ft}@1w5  
    Set oFSO = Nothing h=;{oY<V)?  
    Return UBound( lineArray )
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End Function 9B;{]c  
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Sub GetFileList( ByVal in_dir As String, _ 1GzAG;UUo6  
                 ByRef in_flist() As String ) k:7(D_  
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    'Redimension the file list array W6Y]N/v3>  
    Erase in_flist 21"1NJzP  
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    'Tracks how many files are found 3Z1CWzq(  
    Dim fCount As Long Y]&j,j&  
    fCount = 0 HTG%t/S  
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    'Recurse directory and search for text files =>-Rnc@  
    Dim f As String F6z%VWU  
    f = Dir$(in_dir & "*.txt") #\=FO>  
    While f <> "" ^0Mt*e{q  
        ReDim Preserve in_flist(fCount) `nu''B H  
        in_flist(fCount) = f 4<BjC[@~Z{  
        fCount += 1 Yw-G'  
        f = Dir$() VVlr*`  
    Wend -fDnA4;  
    ReDim Preserve in_flist(fCount-1) q.;u?,|E/  
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End Sub v/_  
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