[技术]RPC Photonics扩散片BSDF [复制链接]

摘要： k~#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。 k,>sBk8  
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背景： HH[b1z2D  
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。 | fAt[e_E  
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。 " &B/v"nj  
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步骤 s8T}ah!  
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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。 %\?2W8Qv_J  
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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） 6 flc  
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 (KaP=t}  
例如下所示： yyJ4r}TE  
Sample name:  EDF-C1-56 D'e'xU  
Merging data from file EDF-C1-56 0-0.txt +OkR7bl  
Finished merging RPC data for sample EDF-C1-56 "J(#|v0  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt J2_DP  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 :.B};;N  
a. 创建一个新的散射库 wXf_2qB9  
b. 散射模型命名 K1O0/2O  
c. 改变散射模型为“Tabulated BSDF”. yu~~"Rq)  
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 ） E 5PefD\m  
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。 h
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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， k WYjqv  
g. 点击OK n0#HPI"  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 9,y*kC  
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脚本代码： l+S08IZ  
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'#Language "WWB-COM" T'2(sHk  
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Option Explicit v/6QE;BY&Q  
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Sub Main TfK$tTkM  
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    'Cleanup M
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    ClearOutputWindow() )}\T~#Q]y  
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    Print "Merging RPC Photonics BSDF Data Files" %^}3:0G  
    SetTextColor(255,0,0) D^P_3 B+  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." E7^r3#s  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." i
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    SetTextColor(0,0,0) X<J NwjM%  
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    'Current directory of this script (should be the same as the text files being merged) ,6?L.L  
    Dim cDir As String C#X|U2$  
    cDir = MacroDir$ & "\" gl-O"%rMcL  
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    'Array which will be populated with the list of files to be merged hh`7b,+ 4  
    Dim fList() As String, curFile As String n *|F=fl  
    GetFileList( cDir, fList ) ,dK<2XP  

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    Print "" K:/%7A_{  
    Print "Files found for merging:" G^J|_!.a  
    For Each curFile In fList !Y/$I?13Z  
        Print Chr(9) & curFile !u@e^J{Ao  
    Next C0;c'4(  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. GMRw+z4  
    Dim nameArray() As String, sampName As String bCHA!zO
 
    nameArray = Split(fList(0)," 0-0.txt") Ul7)CT2:  
    sampName  = nameArray(0) iqURlI);P  
    Print "" ziCTvT  
    Print "Sample name: " & Chr(9) & sampName jI!}}K)d  
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    'Open an output file and write the FRED header data <zH24[  
    Dim outFile As String g|8G!7O  
    outFile = cDir & sampName & "_FRED.txt" hrPm$`  
    Open outFile For Output As #1 !\.x7N<)0  
    Print #1, "type bsdf_data" lpLjfHr  
    Print #1, "format angles=deg bsdf=value scale=1" 9/TF#  
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    'Loop the file list, skip the two header lines and write the remaining data to file 0dA'f0Uy\X  
    Dim lineArray() As String, curLine As Long 8W Mhe=[  
    For Each curFile In fList rI)op1K  
        Print "Merging data from file " & curFile }6MHIr=o  
        ReadFile( cDir & curFile, lineArray ) smW 7zGE  
        For curLine = 2 To UBound(lineArray) Fu:VRul=5$  
            Print #1, lineArray(curLine) Va>~7  
        Next ZAVjq;bq  
    Next 4~=/CaG~  
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    'Close the output file Vr0-evwfo  
    Close #1 EOWLGleD1  
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    Print "Finished merging RPC data for sample " & sampName 3 4CqLPg8  
    Print "FRED formatted data file: " & Chr(9) & outFile l -us j%\  
End Sub =B_v
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'Utility function to read the contents of a file into an array of strings. 'Y{fah  
Function ReadFile(ByVal fileName As String, _ &u0JzK  
                  ByRef lineArray() As String) As Long 1*<m,.$  
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    ReadFile = -1 aaW(S K  
    Dim oFSO As Object Mq;m+{B  
    Set oFSO = CreateObject("Scripting.FileSystemObject") .XQ_,  
    Erase lineArray ," ~ew ,  
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    Dim fid As Long W
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    If oFSO.fileexists( fileName ) Then l1XA9>n  
        fid = FreeFile() yUcWX bT@  
        Open fileName For Input As fid [`^5Zb  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) 6jT+kq)  
        Close fid ;2-%IA,  
    End If !2>MaV1,  
    Set oFSO = Nothing O+hN?/>v  
    Return UBound( lineArray ) `MtI>x c  
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End Function R,?
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Sub GetFileList( ByVal in_dir As String, _ /f2HZfj  
                 ByRef in_flist() As String ) 4sOo>.<x  
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    'Redimension the file list array rkOLTi[$  
    Erase in_flist |c,,*^  
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    'Tracks how many files are found ea!_/Y  
    Dim fCount As Long seO7/h_a  
    fCount = 0 cC@B\Q  
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    'Recurse directory and search for text files H0tjBnu   
    Dim f As String jt9fcw  
    f = Dir$(in_dir & "*.txt") e7rD,`NiV  
    While f <> "" Bbk=0+ ^8I  
        ReDim Preserve in_flist(fCount) #_)<~  
        in_flist(fCount) = f CtiTXDc_  
        fCount += 1 . AJ(nJ)  
        f = Dir$() 6S*L[zBnA\  
    Wend >;I$&  
    ReDim Preserve in_flist(fCount-1) 3Q'Q %2  
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End Sub $e>(
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