[技术]RPC Photonics扩散片BSDF [复制链接]

摘要： 4>k I^  
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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。 "kr,x3 =  
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背景： d$[8w/5Of  
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。 @h(!<Ux_  
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。 WgPgG0VJE  
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步骤 $?$9y^\  
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1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下，选择“Raw data”文件。 SSQ
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2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。（脚本代码放在了本文的最后） EzpwGNfz}  
3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 ,R}Z=w#  
例如下所示： qguVaV4Y  
Sample name:  EDF-C1-56 {XHk6w *-  
Merging data from file EDF-C1-56 0-0.txt GA ik;R  
Finished merging RPC data for sample EDF-C1-56 u<kD}  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt `M)E*G  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 HEpM4xe$  
a. 创建一个新的散射库 k9&@(G[K3  
b. 散射模型命名 Q"'V9m7 i  
c. 改变散射模型为“Tabulated BSDF”. m>YWxa  
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 ） iokPmV  
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。 $+TYvA'N  
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/4NeD  
g. 点击OK 1MV
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5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 >b43%^yii  
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脚本代码： r`[B@
  
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'#Language "WWB-COM" r w\D>}\  
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Option Explicit _NT[ ~M_Q  
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Sub Main oXbI5XY)wb  
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    'Cleanup B0"0_n7-  
    ClearOutputWindow() 6qDfcs  
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    Print "Merging RPC Photonics BSDF Data Files" )7w@E$l"  
    SetTextColor(255,0,0) bKByU{t  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." 6}STp_x  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." S\b K+  
    SetTextColor(0,0,0) wibwyzo  
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    'Current directory of this script (should be the same as the text files being merged) j[H
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    Dim cDir As String 1
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    cDir = MacroDir$ & "\" pX^=be_  
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    'Array which will be populated with the list of files to be merged EIPnm%{1  
    Dim fList() As String, curFile As String oR#my ^  
    GetFileList( cDir, fList ) 0+|>-b/%  
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    Print "" W\NG>t  
    Print "Files found for merging:" }+_9"YQ:  
    For Each curFile In fList -_HRqw,Z0  
        Print Chr(9) & curFile uR
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    Next X?R |x[  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 1I b_Kmb-  
    Dim nameArray() As String, sampName As String Uh%6LPg^  
    nameArray = Split(fList(0)," 0-0.txt") 2md.S$V$,  
    sampName  = nameArray(0) E9L!)D]Y  
    Print "" ez+yP,.#  
    Print "Sample name: " & Chr(9) & sampName TwUsVM(~  
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    'Open an output file and write the FRED header data *V-
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    Dim outFile As String Y.X4*B  
    outFile = cDir & sampName & "_FRED.txt" /L$NE$D} "  
    Open outFile For Output As #1 ~hzEKvs  
    Print #1, "type bsdf_data" @C07k^j=U  
    Print #1, "format angles=deg bsdf=value scale=1" p&uCp7]U  
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    'Loop the file list, skip the two header lines and write the remaining data to file fRFYJFc n  
    Dim lineArray() As String, curLine As Long RJL
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    For Each curFile In fList 4M7^
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        Print "Merging data from file " & curFile I^@.Awt  
        ReadFile( cDir & curFile, lineArray ) P|8e%P  
        For curLine = 2 To UBound(lineArray) l<Lz{)OR  
            Print #1, lineArray(curLine) 3r`<(%\  
        Next 6$DG.p
 
    Next k0knPDbHv  
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    'Close the output file 4Lw'v:(  
    Close #1 %^T!@uZr  
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    Print "Finished merging RPC data for sample " & sampName t+J)dr  
    Print "FRED formatted data file: " & Chr(9) & outFile g/6nwa  
End Sub 'Nw6.5  
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'Utility function to read the contents of a file into an array of strings. P.!;Uf}32  
Function ReadFile(ByVal fileName As String, _ Z<I[vp6{  
                  ByRef lineArray() As String) As Long o:4CI  
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    ReadFile = -1 }pt-q[s>  
    Dim oFSO As Object y6\ [1nZ  
    Set oFSO = CreateObject("Scripting.FileSystemObject") bYK]G+Ww  
    Erase lineArray 1aVgwAI  
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    Dim fid As Long unpfA#&!"  
    If oFSO.fileexists( fileName ) Then [1mIdwS  
        fid = FreeFile() BJ"Ay@D*  
        Open fileName For Input As fid b6]e4DL:R  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) |KTpK(6p  
        Close fid ynxWQ%d(`  
    End If 1ZKz3)K  
    Set oFSO = Nothing > e;]mU`,  
    Return UBound( lineArray ) w9'H.Lq  
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End Function '8L(f w{k  
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Sub GetFileList( ByVal in_dir As String, _ $,g 3*A  
                 ByRef in_flist() As String ) 5=*@l  
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    'Redimension the file list array y{:]sHyG  
    Erase in_flist zo/0b/lQ  
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    'Tracks how many files are found bU:V%B?=]  
    Dim fCount As Long ^GrNfB[Qu  
    fCount = 0 >c&4_?d&,A  
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    'Recurse directory and search for text files Feh"!k <6k  
    Dim f As String ]j72P  
    f = Dir$(in_dir & "*.txt") -`,~9y;tx  
    While f <> "" dE+C
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        ReDim Preserve in_flist(fCount) 6vMDm0sv  
        in_flist(fCount) = f iZsau2K  
        fCount += 1 XryQ)x(  
        f = Dir$() F
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    Wend W<Bxm|  
    ReDim Preserve in_flist(fCount-1) :v|r=#OI  
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End Sub Mr#oT?