[技术]RPC Photonics扩散片BSDF [复制链接]

摘要： ew~?&=  
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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。 !uO@4]:Y  
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背景： ,>za|y<n  
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。 +\;Ro18?  
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。 DVMdRfA  
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步骤 5j$&Zgx51  
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1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下，选择“Raw data”文件。 >d
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2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。（脚本代码放在了本文的最后） V6'u
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3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 |=0w_)Fa]  
例如下所示： d*VvQU8C  
Sample name:  EDF-C1-56 "I
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Merging data from file EDF-C1-56 0-0.txt @YQ*a4`  
Finished merging RPC data for sample EDF-C1-56 TJZ/lJU  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt WTM  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 LI25VDZ|iP  
a. 创建一个新的散射库 J\w4N",  
b. 散射模型命名 Y .cjEeL@  
c. 改变散射模型为“Tabulated BSDF”. NZ&ZK@h}.  
d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） Rm}5AJ  
e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 -mGG:#yP  
f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， /5z,G r  
g. 点击OK <|.]$QSi  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 <66%(J>  
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脚本代码： &-p~UZy  
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'#Language "WWB-COM" 5Phsh  
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Option Explicit
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Sub Main q_`j-!  
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    'Cleanup i+in?!@G:  
    ClearOutputWindow() X%znNx  
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    Print "Merging RPC Photonics BSDF Data Files" K]Vp! G  
    SetTextColor(255,0,0) wB'!@>db  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." %
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    Print "Note: Do not run this script multiple times without deleting the output file between executions." [tJn!cMs  
    SetTextColor(0,0,0) ~av#r=x  
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    'Current directory of this script (should be the same as the text files being merged) 7&wxnxSk^  
    Dim cDir As String q5hE S  
    cDir = MacroDir$ & "\" ,!alNNY  
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    'Array which will be populated with the list of files to be merged B8"c+<b  
    Dim fList() As String, curFile As String ]s^+/8d=  
    GetFileList( cDir, fList ) F[%k;aJ  
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    Print "" >B~? }@^Gk  
    Print "Files found for merging:" 8@(?E[&O>  
    For Each curFile In fList SCe$v76p#  
        Print Chr(9) & curFile ot2zY dWAz  
    Next 3{t[>O;  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. v0! 1W  
    Dim nameArray() As String, sampName As String , .~k  
    nameArray = Split(fList(0)," 0-0.txt") 7RBEEE`)  
    sampName  = nameArray(0) %+,*$wk#*  
    Print "" <-b9 )>  
    Print "Sample name: " & Chr(9) & sampName 3h>L0  
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    'Open an output file and write the FRED header data %HtgZeY  
    Dim outFile As String }N(gP_?n  
    outFile = cDir & sampName & "_FRED.txt" Y@#N_]oXj  
    Open outFile For Output As #1 mIDV
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    Print #1, "type bsdf_data" EmrkaV-?k  
    Print #1, "format angles=deg bsdf=value scale=1" EK[J!~  
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    'Loop the file list, skip the two header lines and write the remaining data to file DUl+Jqn4B  
    Dim lineArray() As String, curLine As Long !03JA9lo  
    For Each curFile In fList N\Lu+ x5  
        Print "Merging data from file " & curFile OaY89ko  
        ReadFile( cDir & curFile, lineArray ) {5{VGAD&]>  
        For curLine = 2 To UBound(lineArray) X0^@E  
            Print #1, lineArray(curLine) y9/nkF1p  
        Next hLuv  
    Next .81Y/Gad_  
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    'Close the output file  ^,ISz-4  
    Close #1 XR7v
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    Print "Finished merging RPC data for sample " & sampName Sa9VwVUE  
    Print "FRED formatted data file: " & Chr(9) & outFile w}OBp^V^  
End Sub l5VRdZ4Uf  
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'Utility function to read the contents of a file into an array of strings. dm=?o  
Function ReadFile(ByVal fileName As String, _ uQx/o^  
                  ByRef lineArray() As String) As Long S ;rd0+J  
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    ReadFile = -1 zng.(]U/?H  
    Dim oFSO As Object *U$]U0M  
    Set oFSO = CreateObject("Scripting.FileSystemObject") *<67h*|)  
    Erase lineArray =M*pym]QSY  
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    Dim fid As Long #>)z}a]  
    If oFSO.fileexists( fileName ) Then
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        fid = FreeFile() P/1YN  
        Open fileName For Input As fid #;^UW  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) 3~3tjhw;]9  
        Close fid 9oGcbD4*  
    End If ;Bz|hB{  
    Set oFSO = Nothing _Y&.Nw  
    Return UBound( lineArray ) F_R\  

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End Function 2P8wvNDG  
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Sub GetFileList( ByVal in_dir As String, _ B?-w<":!  
                 ByRef in_flist() As String ) g&F$hm  
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    'Redimension the file list array C^4,L \E  
    Erase in_flist )}N:t:rry  
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    'Tracks how many files are found 0wVM%Dng  
    Dim fCount As Long y3 N[F  
    fCount = 0 x X3I`  
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    'Recurse directory and search for text files ^(C4Q?[2m  
    Dim f As String @SxZ>|r-|v  
    f = Dir$(in_dir & "*.txt") 8+gp"!E  
    While f <> "" ^VMCs/g6  
        ReDim Preserve in_flist(fCount) 62'9lriQ  
        in_flist(fCount) = f >}~[ew  
        fCount += 1 wH@S$WT  
        f = Dir$() Fs4shrt  
    Wend 5,^DT15a4P  
    ReDim Preserve in_flist(fCount-1) )mOM!I7D@  
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End Sub ibQ xL3