[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： 0\cnc^Z  
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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。 ` /I bWu  
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背景： Pqy-gWOv  
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。 U@.u-)oX  
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。 }rzdm9  
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步骤 /[a|DUoHO  
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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。 [1z{T(d
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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） Ro'jM0(KE  
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 CN.6E<9'kK  
例如下所示： koOyZ>  
Sample name:  EDF-C1-56 r0F_;  
Merging data from file EDF-C1-56 0-0.txt 3<c*v/L{C\  
Finished merging RPC data for sample EDF-C1-56 O.*jR`
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FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt T>#TDMU#Fm  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 <9ma(PFa  
a. 创建一个新的散射库 W1xf2=z`)T  
b. 散射模型命名 }*iAE>;  
c. 改变散射模型为“Tabulated BSDF”. Ur^YG4(  
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 ） W`#gpi)7N  
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。 3PsxOb+  
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， B-!guf rnY  
g. 点击OK <O;&qT*b  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 @. "
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脚本代码： 43
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'#Language "WWB-COM" X*0k>j  
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Option Explicit Q}=fVY  
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Sub Main .+OB!'dDK^  
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    'Cleanup $u:<x
  
    ClearOutputWindow() O{~KR/  
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    Print "Merging RPC Photonics BSDF Data Files" vruD U#  
    SetTextColor(255,0,0) '}_=kp'X  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." 5\WUoSgy  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." NN^QU
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    SetTextColor(0,0,0) ThtMRB)9  
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    'Current directory of this script (should be the same as the text files being merged) 47KNT7C  
    Dim cDir As String -!l^]MU  
    cDir = MacroDir$ & "\" J<rlz5':  
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    'Array which will be populated with the list of files to be merged @a0Q0M  
    Dim fList() As String, curFile As String ] @ufV  
    GetFileList( cDir, fList ) avg4K*
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    Print "" E30Ln_^o  
    Print "Files found for merging:" !:3^ hb  
    For Each curFile In fList #G[t X6gU  
        Print Chr(9) & curFile e^zHw^js  
    Next Y~}5axSPH  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. ?IILt=)<  
    Dim nameArray() As String, sampName As String nWk e#{[  
    nameArray = Split(fList(0)," 0-0.txt") n&$/Q$d&  
    sampName  = nameArray(0) B[CA 5Ry  
    Print "" :5jexz."M  
    Print "Sample name: " & Chr(9) & sampName TKo<~?  
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    'Open an output file and write the FRED header data 9mDnKW  
    Dim outFile As String NEw$q4  
    outFile = cDir & sampName & "_FRED.txt"
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    Open outFile For Output As #1 `Ug tvo  
    Print #1, "type bsdf_data" >OK#n)U`  
    Print #1, "format angles=deg bsdf=value scale=1" gX^ PSsp  
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    'Loop the file list, skip the two header lines and write the remaining data to file wN(&5rfS  
    Dim lineArray() As String, curLine As Long OM)3Y6rK  
    For Each curFile In fList {rDq_^  
        Print "Merging data from file " & curFile WqE '(  
        ReadFile( cDir & curFile, lineArray ) e\D|
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        For curLine = 2 To UBound(lineArray) }RIU8=P  
            Print #1, lineArray(curLine) RU|X*3";T  
        Next ,:UX<6l R  
    Next <: :VCA%  
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    'Close the output file epkD*7  
    Close #1 ^s-25 6iI  
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    Print "Finished merging RPC data for sample " & sampName 8
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    Print "FRED formatted data file: " & Chr(9) & outFile E{%SR  
End Sub g*J@[y;  
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'Utility function to read the contents of a file into an array of strings. KP{3iUqvO  
Function ReadFile(ByVal fileName As String, _ E7`qmn  
                  ByRef lineArray() As String) As Long Da_()e[9p  
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    ReadFile = -1 "%@v++4y  
    Dim oFSO As Object mp1ttGUtM  
    Set oFSO = CreateObject("Scripting.FileSystemObject") 0%#\w*X8  
    Erase lineArray Qnt5HSSt  
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    Dim fid As Long 2w?hgNz  
    If oFSO.fileexists( fileName ) Then ?aWx(dVQ  
        fid = FreeFile() 0` 5e  
        Open fileName For Input As fid T$mbk3P  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) EI1? GB)b  
        Close fid )];aIA$  
    End If p$XKlg&  
    Set oFSO = Nothing 0BK5qz  
    Return UBound( lineArray ) >bIF>9T  
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End Function h/m6)m.D  
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Sub GetFileList( ByVal in_dir As String, _ N'?u1P4G  
                 ByRef in_flist() As String )  uMd. j$$  
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    'Redimension the file list array kO_5|6  
    Erase in_flist ?fK1  
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    'Tracks how many files are found ^R~~L  
    Dim fCount As Long GBQn_(b9I  
    fCount = 0 :_HF j.JW  
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    'Recurse directory and search for text files z7T0u.4Ss  
    Dim f As String r\qz5G *6  
    f = Dir$(in_dir & "*.txt") DNP@A4~  
    While f <> "" 27#5y_ `  
        ReDim Preserve in_flist(fCount) N+g@8Q2s;5  
        in_flist(fCount) = f [po "To  
        fCount += 1 fY W|p<Q0  
        f = Dir$() ."6[:MF  
    Wend 5o0Ch  
    ReDim Preserve in_flist(fCount-1) SSA W52xC  
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End Sub 0xMj=3']  
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