[技术]RPC Photonics扩散片BSDF [复制链接]

摘要： xBG&ZM4"^f  
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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。 ?A(=%c|,g  
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背景： L|S#(0  
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。 u)&6;A4  
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。 PmvTCfsg  
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步骤 ~Ht[kO  
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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。 &k&tkE  
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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） P~;NwHZ?k  
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 Vy
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例如下所示： $b\Gl=YX^  
Sample name:  EDF-C1-56 |GL#E"[&'  
Merging data from file EDF-C1-56 0-0.txt h\C  
Finished merging RPC data for sample EDF-C1-56 4xT(Uj  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt p}R)qz-=5U  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 tA
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a. 创建一个新的散射库 /,2Em>  
b. 散射模型命名 W3{k{~  
c. 改变散射模型为“Tabulated BSDF”. I6YN&9Y  
d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） ,":ADO-  
e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 oQ8W0`bZa  
f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， NJs )2  
g. 点击OK =B*,S#r  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 e_g7E+6  
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脚本代码： DDN#w<#  
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'#Language "WWB-COM" _(<[!c!@0  
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Option Explicit YX18!OhQ  
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Sub Main e}(ws~.  
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    'Cleanup 3VB{Qj  
    ClearOutputWindow() 0>4:(t7h\  
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    Print "Merging RPC Photonics BSDF Data Files" wR@fB  
    SetTextColor(255,0,0) \2: JX?Jw!  
    Print "Note: Script should be located in the same folder as the BSDF TXT files."  -"\z|OQ  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." wCkhE,#-_  
    SetTextColor(0,0,0) }7X85@jC  
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    'Current directory of this script (should be the same as the text files being merged) fJd!;ur)0  
    Dim cDir As String %z`bu
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    cDir = MacroDir$ & "\" OY51~#BF  
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    'Array which will be populated with the list of files to be merged bxc#bl3  
    Dim fList() As String, curFile As String L 2Os\  
    GetFileList( cDir, fList ) 1}QU\
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    Print "" &( b\jyf  
    Print "Files found for merging:" ,l#V eC  
    For Each curFile In fList n$a
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        Print Chr(9) & curFile y2TJDb1  
    Next Pp@P]  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. g
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    Dim nameArray() As String, sampName As String #Ji&.T^U/  
    nameArray = Split(fList(0)," 0-0.txt") 7 H.2]X  
    sampName  = nameArray(0) S)n~^q  
    Print "" elJLT
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    Print "Sample name: " & Chr(9) & sampName &f|LjpMCf  
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    'Open an output file and write the FRED header data ORA+>  
    Dim outFile As String [q?{
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    outFile = cDir & sampName & "_FRED.txt" = =cAL"Z  
    Open outFile For Output As #1 ^bexXYh  
    Print #1, "type bsdf_data" @2L+"=u#  
    Print #1, "format angles=deg bsdf=value scale=1" 3!Gnc0%c  
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    'Loop the file list, skip the two header lines and write the remaining data to file b_|`jHes  
    Dim lineArray() As String, curLine As Long bs kG!w  
    For Each curFile In fList k129)79  
        Print "Merging data from file " & curFile GW]Ygf1t  
        ReadFile( cDir & curFile, lineArray ) # yAt `
 
        For curLine = 2 To UBound(lineArray) 2Rc#{A  
            Print #1, lineArray(curLine) ]pzf{8%  
        Next 8)\ ?6C  
    Next /Pxt f~$  
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    'Close the output file HKP<
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    Close #1 X) owj7U;  
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    Print "Finished merging RPC data for sample " & sampName ^}a..@|%W  
    Print "FRED formatted data file: " & Chr(9) & outFile BB.^-0up  
End Sub MQG(n+c  
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'Utility function to read the contents of a file into an array of strings. :Z- =1b~  
Function ReadFile(ByVal fileName As String, _ :tl*>d~  
                  ByRef lineArray() As String) As Long VA&_dU]*  
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    ReadFile = -1 \3"4;fM!i  
    Dim oFSO As Object K pDKIi  
    Set oFSO = CreateObject("Scripting.FileSystemObject") z|Q)^  
    Erase lineArray 9G[!"eZ}  
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    Dim fid As Long c/jU+,_g  
    If oFSO.fileexists( fileName ) Then
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        fid = FreeFile() N<zD<q  
        Open fileName For Input As fid \'xF\V  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) I%ivY  
        Close fid o+*YX!]#L  
    End If 2`9e20  
    Set oFSO = Nothing j_H9l,V  
    Return UBound( lineArray ) j2#RO>`,I  
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End Function e4fh<0gX  
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Sub GetFileList( ByVal in_dir As String, _ 6ey{+8  
                 ByRef in_flist() As String ) --6C>iY[&u  
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    'Redimension the file list array z\Hg@J&#  
    Erase in_flist s/"&k  
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    'Tracks how many files are found n`8BE9h^  
    Dim fCount As Long 6!sC  
    fCount = 0 sG7G$G*ta!  
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    'Recurse directory and search for text files 3k(A&]~v  
    Dim f As String s1.EE|h,5  
    f = Dir$(in_dir & "*.txt")  ?12[8  
    While f <> "" j#G4A%_  
        ReDim Preserve in_flist(fCount) RL4J{4
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        in_flist(fCount) = f Q"7vzri  
        fCount += 1 }$iKz*nx|  
        f = Dir$() Y)H~*-vGu  
    Wend ,P ~jO  
    ReDim Preserve in_flist(fCount-1) He vZ}.  
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End Sub )
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