[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： &\;<t,3A~  
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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。 :r1;}hIA9  
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背景： fOa6,  
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。 U0NOU#  
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。 zW*}`S"  
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步骤 ;j>*;Q`  
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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。 q*~gWn>T  
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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） bjPka{PBj  
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 N=OS\pz  
例如下所示： t9G}Yd[T  
Sample name:  EDF-C1-56 OJv}kwV  
Merging data from file EDF-C1-56 0-0.txt u~" si
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Finished merging RPC data for sample EDF-C1-56  uY.=4l  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt EoKC8/  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 m!rwG(  
a. 创建一个新的散射库 /h/6&R0l  
b. 散射模型命名 Q Oz9\,C  
c. 改变散射模型为“Tabulated BSDF”. .CVUEK@Z4  
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 ） <A)+|Y"^h6  
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。 .qSBh hH\  
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， 'I&|1I^  
g. 点击OK zL9VR;q  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 HbNYP/MN3  
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脚本代码： sT)6nV  
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'#Language "WWB-COM" .2e1S{9  
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Option Explicit %PzQ\c  
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Sub Main _)Qy4[S=d  
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    'Cleanup pFpZbU^  
    ClearOutputWindow() :v`o6x8  
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    Print "Merging RPC Photonics BSDF Data Files" [#0Yt/G  
    SetTextColor(255,0,0) QjLji+L  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." 4GVNw!V  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." ,~- ?l7  
    SetTextColor(0,0,0) 3@G;'|z  
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    'Current directory of this script (should be the same as the text files being merged) iSlFRv?a  
    Dim cDir As String tVunh3-  
    cDir = MacroDir$ & "\" i`+B4I8[  
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    'Array which will be populated with the list of files to be merged hm3jpWi8  
    Dim fList() As String, curFile As String k5a\Sq}  
    GetFileList( cDir, fList ) N0Gf0i>  
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    Print "" B s,as  
    Print "Files found for merging:" co/7lsW  
    For Each curFile In fList {DT4mG5  
        Print Chr(9) & curFile CN/IH  
    Next k^^:;OR  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. ^/*KNnAWp  
    Dim nameArray() As String, sampName As String =D].`  
    nameArray = Split(fList(0)," 0-0.txt") >dk9f}7-  
    sampName  = nameArray(0) {]^2R>0Q  
    Print "" ]ZTcOf  
    Print "Sample name: " & Chr(9) & sampName =Ey`M#t;  
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    'Open an output file and write the FRED header data kM!V.e[g  
    Dim outFile As String k(v
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    outFile = cDir & sampName & "_FRED.txt" |) Pi6Y  
    Open outFile For Output As #1 A W)a">|  
    Print #1, "type bsdf_data" G AQ 'Ti1!  
    Print #1, "format angles=deg bsdf=value scale=1" oEu>}JD  
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    'Loop the file list, skip the two header lines and write the remaining data to file s*Ih_Ag=:  
    Dim lineArray() As String, curLine As Long ,
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    For Each curFile In fList u g\w\b  
        Print "Merging data from file " & curFile se!mb _!  
        ReadFile( cDir & curFile, lineArray ) Fc8E Y*  
        For curLine = 2 To UBound(lineArray) JRO$<  
            Print #1, lineArray(curLine) M$A
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        Next HM&1yubh#  
    Next <C<`J{X0  
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    'Close the output file We}lx{E  
    Close #1 O"*`'D|hK  
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    Print "Finished merging RPC data for sample " & sampName )`8pd 7<.  
    Print "FRED formatted data file: " & Chr(9) & outFile D|_V<'  
End Sub DA"}A`HfI  
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'Utility function to read the contents of a file into an array of strings. "+|L_iuNQ  
Function ReadFile(ByVal fileName As String, _ XoR>H4xh  
                  ByRef lineArray() As String) As Long 7byCc_,
  
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    ReadFile = -1 Z0ReWrl;`  
    Dim oFSO As Object )NT5yF,m  
    Set oFSO = CreateObject("Scripting.FileSystemObject") 4:mCXP,x  
    Erase lineArray <y)E>Fl  
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    Dim fid As Long ^Y04qeRd  
    If oFSO.fileexists( fileName ) Then *Msr15  
        fid = FreeFile() e*]r  
        Open fileName For Input As fid 9<s4yZF@x  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) RY=1H  
        Close fid lj2=._@R  
    End If G> \Tbx  
    Set oFSO = Nothing )%Ru#}1X6  
    Return UBound( lineArray ) 4tXSYHd3  
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End Function ?4[H]BK  
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Sub GetFileList( ByVal in_dir As String, _ _+w/ pS`M  
                 ByRef in_flist() As String ) &mE?y%  
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    'Redimension the file list array :0^s0l  
    Erase in_flist 8o-bd_  
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    'Tracks how many files are found ~xyw>m+o.  
    Dim fCount As Long $-vo}k%M  
    fCount = 0 eW8[I'v_&  
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    'Recurse directory and search for text files /_\W+^
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    Dim f As String N/~N7MwJj  
    f = Dir$(in_dir & "*.txt") ^Jx$t/t  
    While f <> "" i0pU!`0  
        ReDim Preserve in_flist(fCount) ULBg{e?l8  
        in_flist(fCount) = f A6UO0lyu  
        fCount += 1 7m1KR#j  
        f = Dir$() 0ys~2Y!eH  
    Wend nr\q7  
    ReDim Preserve in_flist(fCount-1) SEF6B45}1  
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End Sub <I=$ry6 8  
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