[技术]RPC Photonics扩散片BSDF [复制链接]

摘要： U?@ 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。 (]_smsok  
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背景： xbVvK+  
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。 p`+=) 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。 2F}D?]A  
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步骤 ^ gy"$F3{`  
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1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下，选择“Raw data”文件。 1{fu  
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2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。（脚本代码放在了本文的最后） `@_jDo  
3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 ES4[@RX  
例如下所示： j7
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Sample name:  EDF-C1-56 MH0xD  
Merging data from file EDF-C1-56 0-0.txt n_ 3g  
Finished merging RPC data for sample EDF-C1-56 S17iYjy#8T  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt Th'B5:`  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 ]QJN` ;b0  
a. 创建一个新的散射库 q PveG1+25  
b. 散射模型命名 KbXENz&C  
c. 改变散射模型为“Tabulated BSDF”. *GZ7S m  
d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） bMA\_?  
e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 d`w3I`P1  
f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， .!`y(N0hc  
g. 点击OK JEL.*[/  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 mX
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脚本代码： HV?Q{XK.b  
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'#Language "WWB-COM" r|ID]}w  
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Option Explicit Ya*<me>`  
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Sub Main _{C =d3  
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    'Cleanup n>XfXt =  
    ClearOutputWindow() .T\jEH8E  
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    Print "Merging RPC Photonics BSDF Data Files" Y& p ~8  
    SetTextColor(255,0,0) #dj,=^1_14  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." rw }wQP_'  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." C"*8bVx]$n  
    SetTextColor(0,0,0) +a'["Gjq;  
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    'Current directory of this script (should be the same as the text files being merged) t_"]n*zk1  
    Dim cDir As String xbNL <3"a  
    cDir = MacroDir$ & "\" OpLo[Y\  
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    'Array which will be populated with the list of files to be merged
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    Dim fList() As String, curFile As String 0s72BcP  
    GetFileList( cDir, fList ) $/FL)m8.3  
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    Print "" }Y&|v q  
    Print "Files found for merging:" Q3'L\_1L  
    For Each curFile In fList ?ZAynZF|#  
        Print Chr(9) & curFile K[^BRn  
    Next ([ODmZHv  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. PLueH/gC.  
    Dim nameArray() As String, sampName As String ^//`Dz  
    nameArray = Split(fList(0)," 0-0.txt") O$(#gB'B  
    sampName  = nameArray(0) K9tr Iy$v  
    Print "" WzqYBa  
    Print "Sample name: " & Chr(9) & sampName (&!x2M  
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    'Open an output file and write the FRED header data K}(@Ek  
    Dim outFile As String j2`%sBo  
    outFile = cDir & sampName & "_FRED.txt" Fql|0Fq  
    Open outFile For Output As #1 S7h?tR*u  
    Print #1, "type bsdf_data" E#VF7 9L  
    Print #1, "format angles=deg bsdf=value scale=1" |0nt u+  
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    'Loop the file list, skip the two header lines and write the remaining data to file aflBDo1c  
    Dim lineArray() As String, curLine As Long miB+
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    For Each curFile In fList /_!Ed]  
        Print "Merging data from file " & curFile {lbNYjknS  
        ReadFile( cDir & curFile, lineArray ) y41~
  
        For curLine = 2 To UBound(lineArray) gXvE^fE  
            Print #1, lineArray(curLine)
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        Next Ya29t98Pk  
    Next Lk]W?  
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    'Close the output file I\<)9`O  
    Close #1 71c(Nw~iQ  
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    Print "Finished merging RPC data for sample " & sampName <"@5. f1"Y  
    Print "FRED formatted data file: " & Chr(9) & outFile Sv\399(  
End Sub
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'Utility function to read the contents of a file into an array of strings. {.r #j|  
Function ReadFile(ByVal fileName As String, _ f/670Acv  
                  ByRef lineArray() As String) As Long [{.9#cQ"  
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    ReadFile = -1 Gg y7xb  
    Dim oFSO As Object B)BR y%  
    Set oFSO = CreateObject("Scripting.FileSystemObject") =\IUBH+C  
    Erase lineArray }$` PZUw>  
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    Dim fid As Long 2Ft#S8  
    If oFSO.fileexists( fileName ) Then A-l[f\  
        fid = FreeFile() &HtG&RvQf  
        Open fileName For Input As fid FyqsFTh_  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) I_is3y0  
        Close fid "eIE5h  
    End If vu~7Z;y(<j  
    Set oFSO = Nothing g4Nl"s*~
 
    Return UBound( lineArray ) F./P,hhN9  
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End Function ;umbld0  
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Sub GetFileList( ByVal in_dir As String, _ H`nd |  
                 ByRef in_flist() As String ) vT#m 8Kg  
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    'Redimension the file list array N
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    Erase in_flist 6o]j@o8V  
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    'Tracks how many files are found `S|T&|ad0  
    Dim fCount As Long wg^'oy  
    fCount = 0 H^XTzE  
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    'Recurse directory and search for text files < 49\B  
    Dim f As String $9ys! <g  
    f = Dir$(in_dir & "*.txt") ok{ F=z  
    While f <> "" W)Mc$`nX  
        ReDim Preserve in_flist(fCount) jZ0/@zOf  
        in_flist(fCount) = f z}-8p
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        fCount += 1 .RPh#FI6J  
        f = Dir$() c@lH  
    Wend r85j/YK  
    ReDim Preserve in_flist(fCount-1) ZOy^TR  
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End Sub V U
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