[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： Y3F.hk}O  
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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。 ;Z<*.f'^fc  
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背景： bJ5z??  
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。 1x5CsmS  
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。 0GLB3I >  
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步骤 x>/@Z6Wxz  
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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。 9kiy^0 7
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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） G"R>aw  
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 .Af)y_  
例如下所示： [T&y5"@  
Sample name:  EDF-C1-56 s)ajy^6'M  
Merging data from file EDF-C1-56 0-0.txt C=f(NpyD6  
Finished merging RPC data for sample EDF-C1-56 dg@/HLZ  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt Bwvc@(3v  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 |gxB; GG  
a. 创建一个新的散射库 761"S@tf$}  
b. 散射模型命名 4BL,/(W] x  
c. 改变散射模型为“Tabulated BSDF”. u+T, n  
d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） ;DWp>jgy  
e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 .0/Z'.c8  
f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， \:^n-D*fX  
g. 点击OK 5/VB'N#7s  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 =-&iF  
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脚本代码： "f$A0RL  
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'#Language "WWB-COM" tQ<2K*3]  
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Option Explicit  x a,LV  
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Sub Main by3kfY]4s  
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    'Cleanup 0-O.*Q^  
    ClearOutputWindow() 5?Ao9Q]@  
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    Print "Merging RPC Photonics BSDF Data Files" R
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    SetTextColor(255,0,0) D#AxgF_
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    Print "Note: Script should be located in the same folder as the BSDF TXT files." ^]K)V  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." eEFT(e5.>3  
    SetTextColor(0,0,0) h$h`XBVZe;  
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    'Current directory of this script (should be the same as the text files being merged) /{} ]Hu  
    Dim cDir As String l3$?eGGM  
    cDir = MacroDir$ & "\" VrP%4P+  
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    'Array which will be populated with the list of files to be merged "qp_*Y  
    Dim fList() As String, curFile As String c>k6i?u:X7  
    GetFileList( cDir, fList ) LKG|S<s  
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    Print "" $e\R5Lu  
    Print "Files found for merging:" 9~af\G  
    For Each curFile In fList Za?&\  
        Print Chr(9) & curFile aB_z4dqwU  
    Next 'hWRwP|  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. c
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    Dim nameArray() As String, sampName As String Z@umbyM  
    nameArray = Split(fList(0)," 0-0.txt") 0pz X!f1~  
    sampName  = nameArray(0) >FhBl\oIi  
    Print "" 7K4%`O   
    Print "Sample name: " & Chr(9) & sampName T!E LH!  
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    'Open an output file and write the FRED header data t0(hc7`  
    Dim outFile As String Un+Jz ?Y  
    outFile = cDir & sampName & "_FRED.txt" 4 ETVyK|  
    Open outFile For Output As #1 );LwWKa  
    Print #1, "type bsdf_data" v#G ^W  
    Print #1, "format angles=deg bsdf=value scale=1" \rO>FE  
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    'Loop the file list, skip the two header lines and write the remaining data to file S?<Qa;  
    Dim lineArray() As String, curLine As Long MQu6Tm H  
    For Each curFile In fList 6Z=H>
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        Print "Merging data from file " & curFile ],4LvIPD  
        ReadFile( cDir & curFile, lineArray ) Ss}0.5Bq  
        For curLine = 2 To UBound(lineArray) %m`QnRX?D  
            Print #1, lineArray(curLine) nrS_t y  
        Next {5`?0+  
    Next 'z:p8"h}  
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    'Close the output file ,j<"~"] =  
    Close #1 ?i"FdpW  
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    Print "Finished merging RPC data for sample " & sampName +f+yh0Dj  
    Print "FRED formatted data file: " & Chr(9) & outFile fZC,%p  
End Sub /|f]L9)2<  
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'Utility function to read the contents of a file into an array of strings. 6h%(0=^  
Function ReadFile(ByVal fileName As String, _ h'+ swPh  
                  ByRef lineArray() As String) As Long Y'9deX+  
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    ReadFile = -1 d8I/7 ;F X  
    Dim oFSO As Object Cz%ih#^b  
    Set oFSO = CreateObject("Scripting.FileSystemObject") ' r/1+.  
    Erase lineArray D?R z|  
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    Dim fid As Long 0Og =H79<  
    If oFSO.fileexists( fileName ) Then `1gsrHi4N  
        fid = FreeFile() mUxD.;P  
        Open fileName For Input As fid y-mmc}B>N  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) +Gko[<  
        Close fid oZCO$a  
    End If _JS'~JO3{  
    Set oFSO = Nothing CDhk!O..  
    Return UBound( lineArray ) ewY X\  
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End Function ns-x\B?^  
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Sub GetFileList( ByVal in_dir As String, _ +]X^b
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                 ByRef in_flist() As String ) t$J-6dW  
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    'Redimension the file list array "rtmDNpL  
    Erase in_flist ]3G2mY;`"%  
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    'Tracks how many files are found smggr{-  
    Dim fCount As Long apXq$wWq{D  
    fCount = 0 '4iu0ie>D  
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    'Recurse directory and search for text files })Jp5vv  
    Dim f As String ;FUd.vg{  
    f = Dir$(in_dir & "*.txt") Nf1l{N  
    While f <> "" '@FKgy;B)-  
        ReDim Preserve in_flist(fCount) %PpB$  
        in_flist(fCount) = f .dV!du  
        fCount += 1 #oaX<,  
        f = Dir$() chy7hPxC;  
    Wend DIY WFVh  
    ReDim Preserve in_flist(fCount-1) > 01k u  
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End Sub H:`r!5&Qb5  
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