[技术]RPC Photonics扩散片BSDF [复制链接]

摘要： S-:l 60.  
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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。 U:xr['  
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背景： PhM3?$  
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。 OY6lt.t  
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。 (a1s~  
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步骤 )fR'1_  
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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。
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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） r/fLm8+  
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 6546"sU  
例如下所示： &}%3yrU  
Sample name:  EDF-C1-56 xq.,7#3  
Merging data from file EDF-C1-56 0-0.txt )}7rM6hv  
Finished merging RPC data for sample EDF-C1-56 p}}o#a~V),  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt kL,AY-Iu{@  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 6`{Y#2T  
a. 创建一个新的散射库 HkEfBQmh  
b. 散射模型命名 ,`MUd0 n  
c. 改变散射模型为“Tabulated BSDF”. TgVvp0F;  
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 ） o|AV2FM)  
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。 =g$%.  
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， $GYcZN&  
g. 点击OK IiIF4 pQ,  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 ^6|Q$]}Ok  
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脚本代码： uG2Hzav  
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'#Language "WWB-COM" `$7j:<c=  
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Option Explicit InM
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Sub Main }i./,  
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    'Cleanup (5re'Pl  
    ClearOutputWindow() G0|j3y9$  
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    Print "Merging RPC Photonics BSDF Data Files" V,fSn:8%M  
    SetTextColor(255,0,0) ?A;x%8}  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." YUat}-S  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." N)03{$WM  
    SetTextColor(0,0,0) yNP M-  
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    'Current directory of this script (should be the same as the text files being merged) lW1Al>dW<  
    Dim cDir As String tpO%)*  
    cDir = MacroDir$ & "\" OW
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    'Array which will be populated with the list of files to be merged aRdzXq#x  
    Dim fList() As String, curFile As String c%yhODq/  
    GetFileList( cDir, fList ) +dcBh Dq  
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    Print "" [84ss;.$  
    Print "Files found for merging:" <T+)~&g$  
    For Each curFile In fList M3c-/7
 
        Print Chr(9) & curFile oQ1>*[e<u  
    Next ] hGU.C"(  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. x4Mq{MrWp  
    Dim nameArray() As String, sampName As String LWuciHfd+  
    nameArray = Split(fList(0)," 0-0.txt") z;JyHC)  
    sampName  = nameArray(0) 5fMVjd  
    Print "" @k>}h\w  
    Print "Sample name: " & Chr(9) & sampName 9}p?h1NrY  
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    'Open an output file and write the FRED header data /-)\$T1d  
    Dim outFile As String HKbyi~8N=  
    outFile = cDir & sampName & "_FRED.txt" )HQ':ZE$  
    Open outFile For Output As #1 z'Atw"kA  
    Print #1, "type bsdf_data"  eme7y  
    Print #1, "format angles=deg bsdf=value scale=1" 9AO`Zk{/Ez  
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    'Loop the file list, skip the two header lines and write the remaining data to file DJvmwFx  
    Dim lineArray() As String, curLine As Long ^pruQp1X  
    For Each curFile In fList N"1o> !  
        Print "Merging data from file " & curFile S=B?bD_,c  
        ReadFile( cDir & curFile, lineArray ) ul$k xc=N  
        For curLine = 2 To UBound(lineArray) $L7Z_JD5  
            Print #1, lineArray(curLine) \ :To\6\Ri  
        Next ~(OG3`W!  
    Next \H^DiF%f9  
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    'Close the output file ^S:S[0\,  
    Close #1 Vea2 oQq  
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    Print "Finished merging RPC data for sample " & sampName :}'5'oVG  
    Print "FRED formatted data file: " & Chr(9) & outFile p5`iq~e9
 
End Sub @lpo$lN0R  
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'Utility function to read the contents of a file into an array of strings. B;x5os  
Function ReadFile(ByVal fileName As String, _ AX($LIy9P  
                  ByRef lineArray() As String) As Long T%74JRQ  
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    ReadFile = -1 }z%fQbw  
    Dim oFSO As Object 'EzKu~*  
    Set oFSO = CreateObject("Scripting.FileSystemObject") )!z4LE  
    Erase lineArray yp}J+/PX}  
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    Dim fid As Long a',6WugIP  
    If oFSO.fileexists( fileName ) Then _y:-_q
 
        fid = FreeFile() kjAARW  
        Open fileName For Input As fid >7g #e,d  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) e}lF#$  
        Close fid ) uM*`%  
    End If /LwS|c6}}  
    Set oFSO = Nothing {A^3<=|  
    Return UBound( lineArray ) 8XfhXm>~  
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End Function /bdL.Y#V  
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Sub GetFileList( ByVal in_dir As String, _ E8X(AZ 2  
                 ByRef in_flist() As String ) lw+54lZX|  
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    'Redimension the file list array p^.qwP\P  
    Erase in_flist |D*a"*1+A  
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    'Tracks how many files are found 2P35#QI[)  
    Dim fCount As Long L6d^e53AP  
    fCount = 0 \ -n&z;`  
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    'Recurse directory and search for text files 3+[;  
    Dim f As String /(oxK>*F  
    f = Dir$(in_dir & "*.txt") Ms<v81z5T  
    While f <> "" %CoO-1@C  
        ReDim Preserve in_flist(fCount) GVT| fE  
        in_flist(fCount) = f pyUzHF0  
        fCount += 1 &/m0N\n?  
        f = Dir$() #W$6[#7=I  
    Wend G*s5GG@Z.  
    ReDim Preserve in_flist(fCount-1) y^0 mf|  
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End Sub (N"9C+S}