[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： #NxvLW/  

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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。 t|XC4:/>T  
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背景： 5rSth.&  
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。 ~_\2\6%1^n  
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。 \O4=
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步骤 Ceb i9R[  
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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。 YLd%"H $n  
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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） 30-wTcG  
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 #>oO[uaY  
例如下所示： 7!r`DZ"yF  
Sample name:  EDF-C1-56 AFA*_9Ut  
Merging data from file EDF-C1-56 0-0.txt r+yLK(<zp  
Finished merging RPC data for sample EDF-C1-56 YZJP7nN  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt )y Y;%
 
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 |"*:ZSj  
a. 创建一个新的散射库 %'< qhGJ  
b. 散射模型命名
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c. 改变散射模型为“Tabulated BSDF”. ?*dx=UI  
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 ） : s3Vl  
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。 tq
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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， sbIhg/:ok  
g. 点击OK 8=Ht+Br  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 OOwJ3I >]>  
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脚本代码： k9?+9bExXA  
a}{! %5  
'#Language "WWB-COM" 'D{abm0  
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Option Explicit 4h(Hy&1C  
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Sub Main |U0@(H  
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    'Cleanup .;s4T?j@w  
    ClearOutputWindow() 6U]7V  
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    Print "Merging RPC Photonics BSDF Data Files" ~;` #{$/C&  
    SetTextColor(255,0,0) ],4LvIPD  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." Ss}0.5Bq  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." upKrr  
    SetTextColor(0,0,0) ('oUcDOFTS  
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    'Current directory of this script (should be the same as the text files being merged) ^)I:82"|?  
    Dim cDir As String $r_gFv  
    cDir = MacroDir$ & "\" HB:i0m2fJW  
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    'Array which will be populated with the list of files to be merged f{oWd]eAhb  
    Dim fList() As String, curFile As String $4]PN2d&  
    GetFileList( cDir, fList ) GC2<K  
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    Print "" egvWPht'_  
    Print "Files found for merging:" ]y e&#  
    For Each curFile In fList b*i+uV?  
        Print Chr(9) & curFile %cL:*D4oz  
    Next 03T.Owd  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. nm.d.A/]Z  
    Dim nameArray() As String, sampName As String cCs:z
 
    nameArray = Split(fList(0)," 0-0.txt") B*7o\~5  
    sampName  = nameArray(0) !NtY4O/  
    Print "" t=#)3C`Q}  
    Print "Sample name: " & Chr(9) & sampName 0XNb@ogo  
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    'Open an output file and write the FRED header data !T)>q%@ai  
    Dim outFile As String DFMWgBL  
    outFile = cDir & sampName & "_FRED.txt" ~r3g~MCHS  
    Open outFile For Output As #1 We2=|AB  
    Print #1, "type bsdf_data" I6_+3}Hm{  
    Print #1, "format angles=deg bsdf=value scale=1" lVHJ}(<'p  
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    'Loop the file list, skip the two header lines and write the remaining data to file ej `$-hBBV  
    Dim lineArray() As String, curLine As Long -u{:39y{n  
    For Each curFile In fList ;f\0GsA#  
        Print "Merging data from file " & curFile DQd&:J@?  
        ReadFile( cDir & curFile, lineArray ) @,vSR
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        For curLine = 2 To UBound(lineArray) %qMk&1  
            Print #1, lineArray(curLine) =*I9qjla[?  
        Next tti.-  
    Next @B6[RZ
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    'Close the output file U<x3=P  
    Close #1 DWG}}vN:&  
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    Print "Finished merging RPC data for sample " & sampName rcOmpgew  
    Print "FRED formatted data file: " & Chr(9) & outFile I5mS!m/X  
End Sub tx.sUu6  
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'Utility function to read the contents of a file into an array of strings. ?(z3/"g]  
Function ReadFile(ByVal fileName As String, _ d{&z^  
                  ByRef lineArray() As String) As Long =0Mmxd&o=M  
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    ReadFile = -1 WW
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    Dim oFSO As Object he,T\};  
    Set oFSO = CreateObject("Scripting.FileSystemObject") XcXd7e  
    Erase lineArray
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    Dim fid As Long c72/e7gV  
    If oFSO.fileexists( fileName ) Then g?ft;kR6S  
        fid = FreeFile() Xs`/q}R  
        Open fileName For Input As fid oKU
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        lineArray = Split(Input(LOF(fid), fid), vbCrLf) GZ"O%:d  
        Close fid t0Uax-E(  
    End If ?AEpg.9R-  
    Set oFSO = Nothing [ 6M8a8C  
    Return UBound( lineArray ) {,m!%FDL  
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End Function VH/_0  
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Sub GetFileList( ByVal in_dir As String, _ q(C+D%xB  
                 ByRef in_flist() As String ) iMSS8J  
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    'Redimension the file list array ?w.Yx$Z"  
    Erase in_flist U;_;_  
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    'Tracks how many files are found Ky+TgR  
    Dim fCount As Long ,,?t>|3  
    fCount = 0 vR-/c  
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    'Recurse directory and search for text files 1.+MX(w  
    Dim f As String 5i0<BZDTef  
    f = Dir$(in_dir & "*.txt") #8'%CUF*<8  
    While f <> "" a 3HS!/  
        ReDim Preserve in_flist(fCount) B|8(}Ciqx  
        in_flist(fCount) = f iS"rMgq  
        fCount += 1 b[$>HB_Na  
        f = Dir$() MSA*XDnN  
    Wend Tsa&R:SE  
    ReDim Preserve in_flist(fCount-1) F](kU#3"S  
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End Sub {pVD`#Tl[  
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