[技术]RPC Photonics扩散片BSDF [复制链接]

摘要： "\T-r2  
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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。 d*VvQU8C  
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背景： Bg[yn<) ]  
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。 "Da-e\yA  
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。 9_F&G('V{a  
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步骤 G
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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。 WT")tjVKA  
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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） 85)C7tJ-g  
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 Otx>S' 5  
例如下所示： X}i2qv  
Sample name:  EDF-C1-56 ,x!r^YO=  
Merging data from file EDF-C1-56 0-0.txt {.p;V  
Finished merging RPC data for sample EDF-C1-56 ],[<^=|  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt TBQ68o  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 FN<>L0  
a. 创建一个新的散射库 XP0;Q;WF}  
b. 散射模型命名 RticGQy&5  
c. 改变散射模型为“Tabulated BSDF”. s$qc&  
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 ） Ba5*]VGG  
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。 H!hd0.  
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， .0RQbc9  
g. 点击OK ,H,[)8
 
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 (V&d:tW  
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脚本代码： @t1pB]O:  
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'#Language "WWB-COM" tKcC{  
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Option Explicit C'y2!Q/"  
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Sub Main >i  >|]  
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    'Cleanup 8Dtpb7\o  
    ClearOutputWindow() )g^qgxnnV  
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    Print "Merging RPC Photonics BSDF Data Files" oQ/T5cOj  
    SetTextColor(255,0,0) )*XWe|H_  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." (!N2,1|  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." 6| o S 5  
    SetTextColor(0,0,0) yocFdI  
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    'Current directory of this script (should be the same as the text files being merged) gp{C89gP  
    Dim cDir As String Ab/JCZNn  
    cDir = MacroDir$ & "\" #.*&#w)  
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    'Array which will be populated with the list of files to be merged %,z;W-#gnY  
    Dim fList() As String, curFile As String /3^XJb$Sa  
    GetFileList( cDir, fList ) DCZG'eb  
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    Print "" eD2eDxN2  
    Print "Files found for merging:" yvzH}$!]  
    For Each curFile In fList *s"OqTM]x  
        Print Chr(9) & curFile 0%[IG$u)|  
    Next |39,n~"o&  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 4lc|~Fj++  
    Dim nameArray() As String, sampName As String 7}~w9jK"F  
    nameArray = Split(fList(0)," 0-0.txt") k+?gWZ\  
    sampName  = nameArray(0) 9_jiUZFje  
    Print "" l4r>#n\yj  
    Print "Sample name: " & Chr(9) & sampName N[\J#x!U  
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    'Open an output file and write the FRED header data Me?I8:/  
    Dim outFile As String S2Ez}*plp  
    outFile = cDir & sampName & "_FRED.txt" 6("bdx;!  
    Open outFile For Output As #1 +a|Q)Ob  
    Print #1, "type bsdf_data" }v|_]   
    Print #1, "format angles=deg bsdf=value scale=1" Nb !i_@m%s  
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    'Loop the file list, skip the two header lines and write the remaining data to file Ly^bP>2i  
    Dim lineArray() As String, curLine As Long oOvQAW8`  
    For Each curFile In fList u=W[ S)w  
        Print "Merging data from file " & curFile _4L6  
        ReadFile( cDir & curFile, lineArray ) R-NM ~gp  
        For curLine = 2 To UBound(lineArray) VY8cy2  
            Print #1, lineArray(curLine) N*$GP3]  
        Next b/R7Mk1  
    Next DW9MX`!Xc  
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    'Close the output file f sh9-iY8e  
    Close #1 C,eP!_O  
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    Print "Finished merging RPC data for sample " & sampName ] L#c <0  
    Print "FRED formatted data file: " & Chr(9) & outFile wf]?:'}  
End Sub W]7<PL*u  
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'Utility function to read the contents of a file into an array of strings. hI*v)c  
Function ReadFile(ByVal fileName As String, _ @M-w8!.~  
                  ByRef lineArray() As String) As Long K/N{F\  
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    ReadFile = -1 X-<,zRM  
    Dim oFSO As Object F09%f"9  
    Set oFSO = CreateObject("Scripting.FileSystemObject") jxkQ #Y  
    Erase lineArray bsU$$;  
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    Dim fid As Long cf"&22TQ+Z  
    If oFSO.fileexists( fileName ) Then aAGV\o{^  
        fid = FreeFile() yc3/5]E&  
        Open fileName For Input As fid yUo8-OaL7  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) YU[#4f~  
        Close fid |36%B7H  
    End If 0%L:jq{5  
    Set oFSO = Nothing GfK%UZ$C  
    Return UBound( lineArray ) X,3\c:  
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End Function 9,_~qWw  
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Sub GetFileList( ByVal in_dir As String, _ XK/l1E3N  
                 ByRef in_flist() As String ) w8Z#]kRv
 
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    'Redimension the file list array >I~Q[  
    Erase in_flist obF|;fwPnR  

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    'Tracks how many files are found !<~.>5UQ  
    Dim fCount As Long >M{98NH  
    fCount = 0 XtZd% #2},  
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    'Recurse directory and search for text files WUz69o be  
    Dim f As String B1~`*~@  
    f = Dir$(in_dir & "*.txt") Yq|_6zbYf  
    While f <> "" L(Twclrb  
        ReDim Preserve in_flist(fCount) "k@[7 7  
        in_flist(fCount) = f e/+.^ '{  
        fCount += 1 T|BlFJ0"  
        f = Dir$() ?3
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    Wend N]iarYc  
    ReDim Preserve in_flist(fCount-1) |?^qsnB  
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End Sub ]WYub1