[技术]RPC Photonics扩散片BSDF [复制链接]

摘要： pbePxOG  
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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。 |.Y}2>{  
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背景： a
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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。 "xKykSk  
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。 '&hk?  
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步骤 TY6Q;BTU  
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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。 iy\ 6e k1  
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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） V*1hoC#  
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 #XPY\n^k  
例如下所示： txp^3dZ`^  
Sample name:  EDF-C1-56 7I`8r2H  
Merging data from file EDF-C1-56 0-0.txt R *uwp'@  
Finished merging RPC data for sample EDF-C1-56 $)6%LG_@  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt T>2_r6;  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 e;G}T%W  
a. 创建一个新的散射库 z[~ph/
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b. 散射模型命名 ;bhD:$NB X  
c. 改变散射模型为“Tabulated BSDF”. A4>
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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 ） rCp'O\@S  
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。 f5ttQ&@FF  
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， U1^3 &N8  
g. 点击OK |%l&H/  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 ]oIP;J:&  
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脚本代码： 64R
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'#Language "WWB-COM" !/RL.`!>  
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Option Explicit V+Y;  
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Sub Main fIwG9cR  
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    'Cleanup _k O<|ev  
    ClearOutputWindow() >%1mx\y^  
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    Print "Merging RPC Photonics BSDF Data Files" LzGS
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    SetTextColor(255,0,0) i8|0zI  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." m4~>n(  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." :xy4JRcF  
    SetTextColor(0,0,0) gPqdl6#c  
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    'Current directory of this script (should be the same as the text files being merged) !}I+)@~
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    Dim cDir As String +Jw+rjnP  
    cDir = MacroDir$ & "\" ]g
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    'Array which will be populated with the list of files to be merged ly( LMr  
    Dim fList() As String, curFile As String #,B+&SK{  
    GetFileList( cDir, fList ) hZwJ@ Vm#  
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    Print "" Cc&SHG*R  
    Print "Files found for merging:" 9:JQ*O$  
    For Each curFile In fList kG>m(n  
        Print Chr(9) & curFile x=YV*  
    Next D*}_

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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. ^t}8E2mq  
    Dim nameArray() As String, sampName As String ;Q\MH t*  
    nameArray = Split(fList(0)," 0-0.txt") ,-`A6ehg  
    sampName  = nameArray(0) IutU~%wv  
    Print "" +<rWYF(ii/  
    Print "Sample name: " & Chr(9) & sampName A Qm!7,  
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    'Open an output file and write the FRED header data w^E$R  
    Dim outFile As String 'mYUAVmSC#  
    outFile = cDir & sampName & "_FRED.txt" ^,{ r[}  
    Open outFile For Output As #1 t7 +U!  
    Print #1, "type bsdf_data" |"aop|  
    Print #1, "format angles=deg bsdf=value scale=1" H>Q X?>j  
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    'Loop the file list, skip the two header lines and write the remaining data to file W0k7(v)  
    Dim lineArray() As String, curLine As Long 8iUYZF  
    For Each curFile In fList @M!nAQ8hY  
        Print "Merging data from file " & curFile ]/[$3rPwZ  
        ReadFile( cDir & curFile, lineArray ) BPd *@l  
        For curLine = 2 To UBound(lineArray) 
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            Print #1, lineArray(curLine) :!L>_ f  
        Next CPci 'SO  
    Next COH9E
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    'Close the output file V6kJoSyde  
    Close #1 W%@0Ym`7  
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    Print "Finished merging RPC data for sample " & sampName j7yUya&
 
    Print "FRED formatted data file: " & Chr(9) & outFile \[L|  
End Sub b8&z~'ieR  
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'Utility function to read the contents of a file into an array of strings. ODKHI\U  
Function ReadFile(ByVal fileName As String, _ n'83P%x  
                  ByRef lineArray() As String) As Long <lP5}F87  
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    ReadFile = -1 j
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    Dim oFSO As Object 7`
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    Set oFSO = CreateObject("Scripting.FileSystemObject") thSXri?kl  
    Erase lineArray `<(o;*&Gd  
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    Dim fid As Long M3s:B& /  
    If oFSO.fileexists( fileName ) Then WDF6.i ?  
        fid = FreeFile() -IS$1  
        Open fileName For Input As fid 
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        lineArray = Split(Input(LOF(fid), fid), vbCrLf) Ygc.0VKMR  
        Close fid `=E4J2"  
    End If zcOG[-  
    Set oFSO = Nothing /
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    Return UBound( lineArray ) wDKA1i%G  
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End Function BHR(B]EI  
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Sub GetFileList( ByVal in_dir As String, _ H(DI /"N  
                 ByRef in_flist() As String ) <*z9:jzQ  
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    'Redimension the file list array (t"e#b(:  
    Erase in_flist :8Ugz~i  
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    'Tracks how many files are found ?|{tWR,Vb  
    Dim fCount As Long Thuwme  
    fCount = 0 RpzW-  
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    'Recurse directory and search for text files c.uD%  
    Dim f As String +GT"n$)+  
    f = Dir$(in_dir & "*.txt") WnQ+  
    While f <> "" 8>'vzc/*>  
        ReDim Preserve in_flist(fCount) H'jo3d~+  
        in_flist(fCount) = f I]Vkaf I>(  
        fCount += 1 Z8o8>C\d9/  
        f = Dir$() ' [%?j?2r  
    Wend m5lTf
 
    ReDim Preserve in_flist(fCount-1) +krDmU9(  
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End Sub N2&h yM