[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： 65A>p:OO  
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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。 `Tf<w+H  
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背景： ?3i-wpzMp  
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。 K31rt-IIt  
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'&eV  
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步骤 *o[*,1Pw  
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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。 ~F]- +|  
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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-j%``I?h  
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 %lPFq-  
例如下所示： vi>V6IC4v  
Sample name:  EDF-C1-56 qx/GioPU  
Merging data from file EDF-C1-56 0-0.txt F3a"SKMW  
Finished merging RPC data for sample EDF-C1-56 (sn|`k3I  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt f-6E>  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 [OsW  
a. 创建一个新的散射库 sOW-GWSE<  
b. 散射模型命名 ODM<$Yo:d  
c. 改变散射模型为“Tabulated BSDF”. DI!l.w5P_  
d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） 'u.`!w '|L  
e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 !NYc!gYD  
f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线，
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g. 点击OK { lLUZM  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 z
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脚本代码： ^fb4g+Au  
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'#Language "WWB-COM" PHD$E s  

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Option Explicit >UuLSF}  
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Sub Main 5kJ>pb$/  
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    'Cleanup /gHRJ$2|Sx  
    ClearOutputWindow() Oy[t}*Ik  
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    Print "Merging RPC Photonics BSDF Data Files" z0Gh |N@)  
    SetTextColor(255,0,0) GI7CZ  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." ;LH?Qu;e  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." `)H.TMI   
    SetTextColor(0,0,0) d|6*1hby  
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    'Current directory of this script (should be the same as the text files being merged) iygdX2  
    Dim cDir As String P5vMy'1X  
    cDir = MacroDir$ & "\" ">voi$Kzey  
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    'Array which will be populated with the list of files to be merged B
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    Dim fList() As String, curFile As String "Rs^0iT7>  
    GetFileList( cDir, fList ) M* QqiE  
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    Print "" Ctt{j'-[  
    Print "Files found for merging:" M6|Q~8$  
    For Each curFile In fList WE`Y!  
        Print Chr(9) & curFile E9226  
    Next 8X*6i-j5E  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 1/w['d4l!  
    Dim nameArray() As String, sampName As String Cg21-G.  
    nameArray = Split(fList(0)," 0-0.txt") >&U]j*'4  
    sampName  = nameArray(0) 'n.eCdj  
    Print "" m=NX;t  
    Print "Sample name: " & Chr(9) & sampName )n
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    'Open an output file and write the FRED header data -oe&1RrdVg  
    Dim outFile As String ybf`7KEP2A  
    outFile = cDir & sampName & "_FRED.txt" +69sG9BA  
    Open outFile For Output As #1 %t%+;(M9  
    Print #1, "type bsdf_data" G*Z4~-E4*  
    Print #1, "format angles=deg bsdf=value scale=1" {?BxVDD07  
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    'Loop the file list, skip the two header lines and write the remaining data to file d:=5y)  
    Dim lineArray() As String, curLine As Long Z:9"7^+  
    For Each curFile In fList KH2a 2  
        Print "Merging data from file " & curFile iu&'v  
        ReadFile( cDir & curFile, lineArray ) 't^OIil  
        For curLine = 2 To UBound(lineArray) P7"g/j""  
            Print #1, lineArray(curLine) > -Jd@7-  
        Next ; >.>vLF  
    Next 7PP76$  
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    'Close the output file ep
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    Close #1 )>$xbo")k  
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    Print "Finished merging RPC data for sample " & sampName (?YTQ8QR  
    Print "FRED formatted data file: " & Chr(9) & outFile sRb)*p'  
End Sub 0P\)L`cG  
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'Utility function to read the contents of a file into an array of strings. :)?w2'O  
Function ReadFile(ByVal fileName As String, _ 0j4bu}@  
                  ByRef lineArray() As String) As Long >,A:zbs&  
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    ReadFile = -1 Q6kkMLh  
    Dim oFSO As Object +:wOzTUN  
    Set oFSO = CreateObject("Scripting.FileSystemObject") !1)lGjMW  
    Erase lineArray y$#mk3(e~t  
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    Dim fid As Long SG;]Vr  
    If oFSO.fileexists( fileName ) Then (PE"_80Z  
        fid = FreeFile() ,S}[48$  
        Open fileName For Input As fid p@NE^aMn  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) nXk<DlTws  
        Close fid |zGwt Z  
    End If Nx;U]O6
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    Set oFSO = Nothing 4vW:xK  
    Return UBound( lineArray ) lySeq^y?Q  
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End Function qA#!3<  
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Sub GetFileList( ByVal in_dir As String, _ mn?< Zz  
                 ByRef in_flist() As String ) =MRg  
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    'Redimension the file list array B@=+Fg DD  
    Erase in_flist $2 ~RZpS  
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    'Tracks how many files are found UP 75}h9  
    Dim fCount As Long #ZRQVC;b;  
    fCount = 0 X'IW&^
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    'Recurse directory and search for text files [&j!g  
    Dim f As String g(>;Z@Y  
    f = Dir$(in_dir & "*.txt") 89U<9j   
    While f <> "" tB'F`HM:mq  
        ReDim Preserve in_flist(fCount) J,_I$* _0  
        in_flist(fCount) = f |\*7J!Liv  
        fCount += 1
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        f = Dir$() mH}/QfUlq  
    Wend 8sx\b  
    ReDim Preserve in_flist(fCount-1) r,A750P^  
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End Sub wtndXhVC4>  
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