[技术]RPC Photonics扩散片BSDF [复制链接]

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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。 xYI
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背景： bKMWWJf*'  
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。 f2yq8/J8.  
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。 O2.'-  
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步骤 CvK3H\.&;k  
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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。 $W&:(&  
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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） nIn2 *r  
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 %
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例如下所示： :g2  }C  
Sample name:  EDF-C1-56 x7dEo%j  
Merging data from file EDF-C1-56 0-0.txt pY
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Finished merging RPC data for sample EDF-C1-56 m`y9Cuk  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt sb^mLH] 3  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 7+nm31,<O  
a. 创建一个新的散射库 I{ ryD -!  
b. 散射模型命名 FI"HJwAs  
c. 改变散射模型为“Tabulated BSDF”. 7 Wl-n  
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 ） B+] D5K  
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。 yK1ie  
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， $DebXxJw0l  
g. 点击OK rp's
 
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 pu9^e4B9  
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脚本代码： ;3"@g]e  
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'#Language "WWB-COM" &Z;_TN
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Option Explicit _=EKXE)&}  
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Sub Main dJ ~Zr)>  
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    'Cleanup 5~'IKcW<  
    ClearOutputWindow() "Sridh?  
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    Print "Merging RPC Photonics BSDF Data Files" ~"K,7sw!Y  
    SetTextColor(255,0,0) V'G Ju  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." pOT7;-#n  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." "6CMA0R  
    SetTextColor(0,0,0) DinPxtT?a  
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    'Current directory of this script (should be the same as the text files being merged) lv%9MW0 z  
    Dim cDir As String xY<{qHcX  
    cDir = MacroDir$ & "\" `P}9i@C  
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    'Array which will be populated with the list of files to be merged t2>fmQIQ  
    Dim fList() As String, curFile As String 2%B'3>a  
    GetFileList( cDir, fList ) 5/MKzoB  
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    Print "" |[$~\MU  
    Print "Files found for merging:" SaOYu &>  
    For Each curFile In fList Gl}Qxv#$  
        Print Chr(9) & curFile Iu[|<C
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    Next T
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. bBc[bc>R  
    Dim nameArray() As String, sampName As String p-GAe,2q  
    nameArray = Split(fList(0)," 0-0.txt") )e|=mtp  
    sampName  = nameArray(0) T>`74B:  
    Print "" vBcq_sbo  
    Print "Sample name: " & Chr(9) & sampName 2c5-)Dt)T  
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    'Open an output file and write the FRED header data )2IH 5  
    Dim outFile As String (kv?33  
    outFile = cDir & sampName & "_FRED.txt" lQ'GX9hN@  
    Open outFile For Output As #1 AlXNg!j;5K  
    Print #1, "type bsdf_data" aj^wRzJ}zA  
    Print #1, "format angles=deg bsdf=value scale=1" V[o`\|<  
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    'Loop the file list, skip the two header lines and write the remaining data to file qOih`dla  
    Dim lineArray() As String, curLine As Long 7&qy5y-Ap  
    For Each curFile In fList /U&Opo {aO  
        Print "Merging data from file " & curFile Uu 8,@W+  
        ReadFile( cDir & curFile, lineArray ) `-h8vj5uG  
        For curLine = 2 To UBound(lineArray) hrGM|_BE  
            Print #1, lineArray(curLine) ~Wo)?q8UY,  
        Next ngohtB^]  
    Next ?L&'- e@  
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    'Close the output file ="wzq+U  
    Close #1 R\@/U=iqR  
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    Print "Finished merging RPC data for sample " & sampName Qx;\USv  
    Print "FRED formatted data file: " & Chr(9) & outFile CCBfKp  
End Sub I M-L'9  
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'Utility function to read the contents of a file into an array of strings. CHrFM@CM  
Function ReadFile(ByVal fileName As String, _ ?=m?jNa;nC  
                  ByRef lineArray() As String) As Long gL_Y,A~Q{  
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    ReadFile = -1 ?qCK7$j  
    Dim oFSO As Object )E@A0W  
    Set oFSO = CreateObject("Scripting.FileSystemObject") 0U%f)mG  
    Erase lineArray V-<GT?  
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    Dim fid As Long ]QzGE8jp*  
    If oFSO.fileexists( fileName ) Then wr[,  
        fid = FreeFile() 3s/H2fz  
        Open fileName For Input As fid vnW
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        lineArray = Split(Input(LOF(fid), fid), vbCrLf) h4q|lA6!k8  
        Close fid O+y-}7YX  
    End If L#E] BY  
    Set oFSO = Nothing oE#d
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    Return UBound( lineArray ) rM'=_nmi  
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End Function |B?27PD  
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Sub GetFileList( ByVal in_dir As String, _ uV!^,,~  
                 ByRef in_flist() As String ) ;\f gF@  
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    'Redimension the file list array kS bu]AB  
    Erase in_flist U}[I   
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    'Tracks how many files are found zIh['^3.n  
    Dim fCount As Long .Fdgb4>BXX  
    fCount = 0
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    'Recurse directory and search for text files -r-k_6QP  
    Dim f As String "?V0$-DR  
    f = Dir$(in_dir & "*.txt") ;kY(<{2  
    While f <> "" Ney/[3 A  
        ReDim Preserve in_flist(fCount) j'A_'g'^  
        in_flist(fCount) = f mV3cp rRqv  
        fCount += 1
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        f = Dir$() :]\([Q+a  
    Wend 9I&xfvD,  
    ReDim Preserve in_flist(fCount-1) ;M)QwF1  
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End Sub M7pOLP_1jB