[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： Hly$ Wm  
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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。 <3'r&ks  
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背景： a4?:suX$  
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。 I%
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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
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步骤 R4{2+q=0  
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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。 L0}"H .  
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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） tJc9R2  
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 -rUn4a  
例如下所示： _jp8;M~Z  
Sample name:  EDF-C1-56 uGOvZO^v  
Merging data from file EDF-C1-56 0-0.txt `zF=h#i  
Finished merging RPC data for sample EDF-C1-56 0]&~ddL  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt Ie4}F|#=  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 5TqX;=B  
a. 创建一个新的散射库 Ao2t=vg  
b. 散射模型命名 HKV]Rn  
c. 改变散射模型为“Tabulated BSDF”. ht` !@B  
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 ） al1Uf]xh  
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。 ]oj 2  
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， {2A/@$?  
g. 点击OK 7i`8 c =.  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 dx?4)lb  
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脚本代码： #7GbG\  
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'#Language "WWB-COM" =JY9K0S~  
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Option Explicit GHfsq|*j,Z  
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Sub Main f3h^R20qmO  
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    'Cleanup Mz_*`lRN  
    ClearOutputWindow() _Uc le  
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    Print "Merging RPC Photonics BSDF Data Files" %&0_0BU  
    SetTextColor(255,0,0) UoCFj2?C  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." se2ay_<F+  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." Cwl#(;@  
    SetTextColor(0,0,0) 6x7pqHM  
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    'Current directory of this script (should be the same as the text files being merged) l*rli[No  
    Dim cDir As String dX?8@uzu  
    cDir = MacroDir$ & "\" %i:Sf  
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    'Array which will be populated with the list of files to be merged u6j\@U6I  
    Dim fList() As String, curFile As String l.Iov?e1S  
    GetFileList( cDir, fList ) e4ym6q<6!  
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    Print "" eX;C.[&7;8  
    Print "Files found for merging:" fL>>hBCqC  
    For Each curFile In fList x8|sdZFxo  
        Print Chr(9) & curFile NBU[>P  
    Next v2][gn+58  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. !36jtKdM  
    Dim nameArray() As String, sampName As String ;Sl]8IZ  
    nameArray = Split(fList(0)," 0-0.txt") Y%m^V?k  
    sampName  = nameArray(0) b=(?\  
    Print "" >VIb|YA  
    Print "Sample name: " & Chr(9) & sampName ?VaWOwWI  
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    'Open an output file and write the FRED header data ;n0VF77>O  
    Dim outFile As String N{w)}me[YY  
    outFile = cDir & sampName & "_FRED.txt" KG=h!]Meq  
    Open outFile For Output As #1 qRC-+k:  
    Print #1, "type bsdf_data" +X#JCLD  
    Print #1, "format angles=deg bsdf=value scale=1" tj7{[3~-[  
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    'Loop the file list, skip the two header lines and write the remaining data to file I
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    Dim lineArray() As String, curLine As Long KElzYZl8  
    For Each curFile In fList csABfxi
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        Print "Merging data from file " & curFile IWc?E  
        ReadFile( cDir & curFile, lineArray ) M`{~AIqd(  
        For curLine = 2 To UBound(lineArray) |:Q`9;  
            Print #1, lineArray(curLine) XpS].P9  
        Next `0'Bg2'  
    Next bLSXQStB  
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    'Close the output file @'XxMO[Z!<  
    Close #1 ':Avh|q3N  
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    Print "Finished merging RPC data for sample " & sampName _ljdo`j#N  
    Print "FRED formatted data file: " & Chr(9) & outFile 2g?O+'JD  
End Sub :56f  
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'Utility function to read the contents of a file into an array of strings. =GGt:3Kx-  
Function ReadFile(ByVal fileName As String, _ j6@5"wx  
                  ByRef lineArray() As String) As Long N3O~_=/v?  
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    ReadFile = -1 vMT:j  
    Dim oFSO As Object ii,/omn:  
    Set oFSO = CreateObject("Scripting.FileSystemObject") wX7|a/|@  
    Erase lineArray yhwwF n\  
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    Dim fid As Long N i\*<:_  
    If oFSO.fileexists( fileName ) Then {tqLH2cO  
        fid = FreeFile() UTT7a"  
        Open fileName For Input As fid gpt98:w:  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) 3JnBKh\n  
        Close fid BM6 J  
    End If .~>Uh3S  
    Set oFSO = Nothing e(t,~(  
    Return UBound( lineArray ) b d!|/Lk  
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End Function {
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Sub GetFileList( ByVal in_dir As String, _ YS7R8|  
                 ByRef in_flist() As String ) F?>rWP   
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    'Redimension the file list array qQzf&"  
    Erase in_flist 1lA
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    'Tracks how many files are found MGoYL\  
    Dim fCount As Long 1#o>< ?  
    fCount = 0 $]H^?  
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    'Recurse directory and search for text files #:C?:RMS  
    Dim f As String kZ^}  
    f = Dir$(in_dir & "*.txt") ">?ocJ\9  
    While f <> "" e7fA-,DV  
        ReDim Preserve in_flist(fCount) C9?R*2L>  
        in_flist(fCount) = f g(9\r  
        fCount += 1 _9@D o6  
        f = Dir$() HC'k81Q  
    Wend u2p5*gzZ  
    ReDim Preserve in_flist(fCount-1) 2d%j6D  
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End Sub )@%wj;>a  
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