[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： `_i-BdW  
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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。 +Z*%,m=N(  
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背景： hNy S  
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。 $ 1ZY Vw  
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。 $n"Llw&)  
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步骤 Xv:IbM> Qc  
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1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下，选择“Raw data”文件。 LAeXe!y  
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2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。（脚本代码放在了本文的最后） D6WsEd>  
3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 4{KsCd)  
例如下所示： f14c}YY  
Sample name:  EDF-C1-56 qfU3Cwy  
Merging data from file EDF-C1-56 0-0.txt Sj?'T@  
Finished merging RPC data for sample EDF-C1-56 aJ5R
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FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt M&dtXG8<^  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 DVl:s  
a. 创建一个新的散射库 Apn#
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b. 散射模型命名 e+[J9;g  
c. 改变散射模型为“Tabulated BSDF”. 2}twt  
d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） 25L{bcng  
e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 u+_#qk0NfK  
f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， xo$ZPnf(zv  
g. 点击OK ?H&p zY~H  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 F`u~Jx8.*  
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脚本代码： %}[??R0  
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'#Language "WWB-COM" 5z_)  
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Option Explicit @!$NUY8,A#  
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Sub Main UL/>t}AG  
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    'Cleanup $$@Tgkg?o  
    ClearOutputWindow() J*k4&l  
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    Print "Merging RPC Photonics BSDF Data Files" ,#G@ri:B  
    SetTextColor(255,0,0) N5\<w>  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." iJi|*P5dw  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." ZeO>Ag^
 
    SetTextColor(0,0,0) 9M<? *8)  

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    'Current directory of this script (should be the same as the text files being merged) / @&Sqv4?  
    Dim cDir As String zkMQ=,[  
    cDir = MacroDir$ & "\" r2G<::<zL  
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    'Array which will be populated with the list of files to be merged jhL
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    Dim fList() As String, curFile As String 9\8""-  
    GetFileList( cDir, fList ) -n9e-0  
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    Print "" xn"g_2Hi  
    Print "Files found for merging:" fAs:[  
    For Each curFile In fList =T$E lXwJ  
        Print Chr(9) & curFile 0\+Qi?&  
    Next ",}VB8K  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. URAipLvN  
    Dim nameArray() As String, sampName As String ;Y"J j  
    nameArray = Split(fList(0)," 0-0.txt") 1pV"<,t  
    sampName  = nameArray(0) "a: ;  
    Print "" iB?@(10}ES  
    Print "Sample name: " & Chr(9) & sampName ,w6?} N  
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    'Open an output file and write the FRED header data \;3r  
    Dim outFile As String _VlNZ/V  
    outFile = cDir & sampName & "_FRED.txt" =8iM,Vl3  
    Open outFile For Output As #1 hCmOSDym  
    Print #1, "type bsdf_data" c_iF S  
    Print #1, "format angles=deg bsdf=value scale=1" O!g>
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    'Loop the file list, skip the two header lines and write the remaining data to file )"1D-Bc\Q  
    Dim lineArray() As String, curLine As Long "\9@gfsp)  
    For Each curFile In fList 7@sWT<P  
        Print "Merging data from file " & curFile ;cO0Y.V9l  
        ReadFile( cDir & curFile, lineArray ) e9 NHbq  
        For curLine = 2 To UBound(lineArray) #_E8>;)k  
            Print #1, lineArray(curLine) _ReQQti[
 
        Next lY1m%  
    Next /nrD
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    'Close the output file 4nY2v['m0  
    Close #1 =3"Nn4Z  
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    Print "Finished merging RPC data for sample " & sampName yR`-rJb V  
    Print "FRED formatted data file: " & Chr(9) & outFile 1kpI?Plki  
End Sub @ +7'0[y?  
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'Utility function to read the contents of a file into an array of strings. 1t)6wk N  
Function ReadFile(ByVal fileName As String, _ >$?Z&7Lv  
                  ByRef lineArray() As String) As Long rdK.*oT  
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    ReadFile = -1 -B_dE-l,  
    Dim oFSO As Object PH]q#/'  
    Set oFSO = CreateObject("Scripting.FileSystemObject") .VUZ4e  
    Erase lineArray qb! vI3  
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    Dim fid As Long 'g^]ZTxb  
    If oFSO.fileexists( fileName ) Then #*9*[Xbi  
        fid = FreeFile() &v:iC u^|  
        Open fileName For Input As fid lu>>~vy6  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) snyx$Qx(  
        Close fid =v_ju;C=  
    End If P`"dj@1'  
    Set oFSO = Nothing i{`>!)U  
    Return UBound( lineArray ) OxD\e5r  
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End Function |BXq8Erh  
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Sub GetFileList( ByVal in_dir As String, _ nB
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                 ByRef in_flist() As String ) 97 1
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    'Redimension the file list array [iDa6mcth  
    Erase in_flist N%T-Q9k  
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    'Tracks how many files are found `xtN+y F  
    Dim fCount As Long v!x=fjr<  
    fCount = 0 /O8'8sL5  
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    'Recurse directory and search for text files !0w'S>e  
    Dim f As String x$Lt?'  
    f = Dir$(in_dir & "*.txt") P[Qr[74)  
    While f <> "" m,*f6g  
        ReDim Preserve in_flist(fCount) xd>2TW l#  
        in_flist(fCount) = f &Z
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        fCount += 1 AD8~  
        f = Dir$() wi9fYfuv3R  
    Wend k_!z=6?[:  
    ReDim Preserve in_flist(fCount-1) YKk%lZ.8  
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End Sub *EotYT  
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