[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： Z[s{  
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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。 q3#07o_dV  
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背景： PSNfh7g  
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。 aHvTbpJ  
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。 cK"b0K/M?B  
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步骤 0ZlF#PJA  
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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。 *2Il{KOA^  
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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） "X=l7{c/  
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 =Wn11JGh  
例如下所示： tT>~;l%'  
Sample name:  EDF-C1-56 LzEs_B=9  
Merging data from file EDF-C1-56 0-0.txt 1-!u=]JDE  
Finished merging RPC data for sample EDF-C1-56 3@f@4t@5V  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt 2&S*> (  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 #XE`8$  
a. 创建一个新的散射库 x|&A^hQ  
b. 散射模型命名 l:5x*QSX  
c. 改变散射模型为“Tabulated BSDF”. 3iMh)YH5b  
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 ） +}@1X&v:  
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。 L}7c{6!F7  
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， X`YAJG  
g. 点击OK rZm|7A)i  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 c;
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脚本代码： }D-h=,];  
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'#Language "WWB-COM" <iDqt5)N  
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Option Explicit `'H"|WsT  
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Sub Main cPZD#";f  
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    'Cleanup g&I/b/A  
    ClearOutputWindow() ppH5>Y 6c  
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    Print "Merging RPC Photonics BSDF Data Files" >jMq-#*4  
    SetTextColor(255,0,0) !B_i~Rmg  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." Uv?s<  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." Y).5(t7zaR  
    SetTextColor(0,0,0) ?4vf2n@  
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    'Current directory of this script (should be the same as the text files being merged) [9| 8p$  
    Dim cDir As String $Kw)BnV  
    cDir = MacroDir$ & "\" :I*G tq   
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    'Array which will be populated with the list of files to be merged QhUv(]
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    Dim fList() As String, curFile As String x@/ N9*  
    GetFileList( cDir, fList ) 7.@$D;L9  
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    Print "" t ' _Au8  
    Print "Files found for merging:" ~7a(KJgvd"  
    For Each curFile In fList {YnR]|0&  
        Print Chr(9) & curFile S3EM6`q'  
    Next zG)XB*c  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. @=4K%
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    Dim nameArray() As String, sampName As String IO3`/R-  
    nameArray = Split(fList(0)," 0-0.txt") FaS}$-0  
    sampName  = nameArray(0) [
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    Print "" ?`T< sk8c  
    Print "Sample name: " & Chr(9) & sampName `D)ay  
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    'Open an output file and write the FRED header data CZaUrr  
    Dim outFile As String (s`oJLW>  
    outFile = cDir & sampName & "_FRED.txt" ;o*n*N  
    Open outFile For Output As #1 5MUM{(C  
    Print #1, "type bsdf_data" <Th)&  
    Print #1, "format angles=deg bsdf=value scale=1" n-iy;L^b  
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    'Loop the file list, skip the two header lines and write the remaining data to file
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    Dim lineArray() As String, curLine As Long mHc
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    For Each curFile In fList 1 ?X(q  
        Print "Merging data from file " & curFile .<uxZ  
        ReadFile( cDir & curFile, lineArray ) uLFnuK  
        For curLine = 2 To UBound(lineArray) wV\;,(<x=%  
            Print #1, lineArray(curLine) 1HOYp*{#wP  
        Next +|6 '7Z(9  
    Next lFvRXV^+f  
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    'Close the output file fT)u`voE,  
    Close #1 ACQbw)tiv}  
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    Print "Finished merging RPC data for sample " & sampName 15PFnk6E|  
    Print "FRED formatted data file: " & Chr(9) & outFile Z(g9rz']0  
End Sub zdY+?s)p  
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'Utility function to read the contents of a file into an array of strings. 9v[cy`\  
Function ReadFile(ByVal fileName As String, _ N$u;Q(^  
                  ByRef lineArray() As String) As Long 0V{a{>+  
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    ReadFile = -1 xDtq@Rb}  
    Dim oFSO As Object QUa_gYp0v  
    Set oFSO = CreateObject("Scripting.FileSystemObject") )nJo\HFXv  
    Erase lineArray +%yVW f  
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    Dim fid As Long YbS$D  
    If oFSO.fileexists( fileName ) Then (S~|hk^  
        fid = FreeFile() BGAqg=nDV  
        Open fileName For Input As fid )C>4?)  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) qf7:Q?+.|  
        Close fid S0X%IG  
    End If 8)I,WWj  
    Set oFSO = Nothing ];@"-H  
    Return UBound( lineArray ) ~pM\]OC  
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End Function Z.9?u;  
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Sub GetFileList( ByVal in_dir As String, _ w7n6@"q  
                 ByRef in_flist() As String ) j9)WInYc:  
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    'Redimension the file list array &S\q*H=}i  
    Erase in_flist <PBrW#:'  
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    'Tracks how many files are found Z+jgFl 4  
    Dim fCount As Long ?_
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    fCount = 0 i1ph{;C  
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    'Recurse directory and search for text files h@nNm30i  
    Dim f As String +(>!nsf  
    f = Dir$(in_dir & "*.txt") j@OGl&'^-  
    While f <> "" hD OEJ  
        ReDim Preserve in_flist(fCount) K@ZK@++  
        in_flist(fCount) = f &zVF!xNy&  
        fCount += 1 (e>.hfrs  
        f = Dir$() 'G3;!xk$  
    Wend UzLe#3MU  
    ReDim Preserve in_flist(fCount-1) h
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End Sub fC!]MhA"i  
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