[技术]RPC Photonics扩散片BSDF [复制链接]

摘要： dL!PpLR$2  
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RPC Photonics公司有高品质的的工程漫射体BSDF测试数据，但它对于FRED帮助甚少，下面这个步骤描述了如何利用FRED脚本转换RPC Photonics提供的TXT文件，并将数据直接应用到FRED的Tabulated scatter 散射模型。 fnl~0   
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背景： A@4sb W_  
Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术，可以解决其他技术的不足，大大改善了诸如光刻系统、有效固态照明，显示，背光，显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体（Engineered DiffusersTM）的新概念，与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同，工程漫射体要求对于每个散射中心，通常为微透镜单元，都进行控制。例如全息漫射体可以视为一组随机排列的透镜，但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制：而无法单独操控每个微透镜单元，这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面，在工程漫射体中，每个微透镜单元形成漫射体，由其凹形纵断面和在阵列中的位置所确定。同时，为了确保漫射体不受输入光束变化的影响，并且不产生衍射效果，微透镜单元的分布是随机的，根据产生相应的光束形状函数所选取的概率分布函数来确定。因此，工程漫射体同时保留了随机与确定性漫射体的优点，从而实现高性能的光束整形功能。 P`0}( '"U  
FRED是美国Photon Engineering 公司开发的光学工程仿真软件，其在杂散光分析中独特的算法、高效的准确性，使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 {94qsVxQZ  
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步骤 R1)v;^B|)  
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1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下，选择“Raw data”文件。 HJ~0_n&  
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2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。（脚本代码放在了本文的最后） `saDeur#X  
3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 DvhJkdLB>  
例如下所示： nB>C3e  
Sample name:  EDF-C1-56 sF[7pE  
Merging data from file EDF-C1-56 0-0.txt G&,F-|`  
Finished merging RPC data for sample EDF-C1-56 Z#+lwZD  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt g$+ $@~  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 xvU@,bzz  
a. 创建一个新的散射库 F/}(FG<'>I  
b. 散射模型命名 }&!fT\4  
c. 改变散射模型为“Tabulated BSDF”. G*`Y~SJp  
d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） ()%Not
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e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 d|I?%LX0p  
f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， ufq9+}  
g. 点击OK R<]f[  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 2z#gn9Wb  
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脚本代码： 4b5'nu  
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'#Language "WWB-COM" !'#Y-"=ypk  
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Option Explicit 4@0y$Dv\  
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Sub Main @
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    'Cleanup }*Z *wC  
    ClearOutputWindow() z"D'rHxy  
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    Print "Merging RPC Photonics BSDF Data Files" 'fo.1  
    SetTextColor(255,0,0) %OT}r  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." u]`ur
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    Print "Note: Do not run this script multiple times without deleting the output file between executions." *M^(A}+O  
    SetTextColor(0,0,0) L JW0UF|  
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    'Current directory of this script (should be the same as the text files being merged) O> .gcLA  
    Dim cDir As String >/J!:Htk+K  
    cDir = MacroDir$ & "\" #"&<^  
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    'Array which will be populated with the list of files to be merged Le,e,#hiY  
    Dim fList() As String, curFile As String ?xX9o  
    GetFileList( cDir, fList ) HnlCEW,^o  
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    Print "" ~3'}^V\  
    Print "Files found for merging:" 'jnR<>N  
    For Each curFile In fList $*-U
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        Print Chr(9) & curFile n=_jmR1  
    Next yUY* l@v]  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. x b6X8:  
    Dim nameArray() As String, sampName As String HEBKRpt  
    nameArray = Split(fList(0)," 0-0.txt") {V
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    sampName  = nameArray(0) `514HgR  
    Print "" ))9w)A@  
    Print "Sample name: " & Chr(9) & sampName _-6IB>  
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    'Open an output file and write the FRED header data ;:Kd?Tz$  
    Dim outFile As String SN<Dxa8Iy  
    outFile = cDir & sampName & "_FRED.txt" h
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    Open outFile For Output As #1 k\/idd[  
    Print #1, "type bsdf_data" e^%>_U  
    Print #1, "format angles=deg bsdf=value scale=1" myq:~^L ;  
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    'Loop the file list, skip the two header lines and write the remaining data to file (?W[#.=7  
    Dim lineArray() As String, curLine As Long
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    For Each curFile In fList p3`odmbN  
        Print "Merging data from file " & curFile xPp\OuwK  
        ReadFile( cDir & curFile, lineArray ) ~[*\YN);  
        For curLine = 2 To UBound(lineArray) gR#lRA/  
            Print #1, lineArray(curLine) Bk44 wz2X  
        Next .ey=gI!x0  
    Next KB@F^&L {  
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    'Close the output file P-Upv6J3  
    Close #1 u6#FG9W7  
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    Print "Finished merging RPC data for sample " & sampName }<=4A\LZ  
    Print "FRED formatted data file: " & Chr(9) & outFile n`TXmg  
End Sub
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'Utility function to read the contents of a file into an array of strings. Xg^9k00C  
Function ReadFile(ByVal fileName As String, _ #]vs*Sz  
                  ByRef lineArray() As String) As Long $C^tZFq  
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    ReadFile = -1 |,)=-21&;  
    Dim oFSO As Object =" Sb>_  
    Set oFSO = CreateObject("Scripting.FileSystemObject") aM6qYO!jA  
    Erase lineArray I[g;p8jr  
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    Dim fid As Long NW%u#MZ[h  
    If oFSO.fileexists( fileName ) Then Kh'7N!  
        fid = FreeFile() V'Z Z4og  
        Open fileName For Input As fid _VM()n;  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) 40i]I@:JK  
        Close fid vCe]iB  
    End If p*ic@n*G  
    Set oFSO = Nothing E9]\ I>v  
    Return UBound( lineArray ) 1;FtQnvH  
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End Function 8p0ZIrD%  
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Sub GetFileList( ByVal in_dir As String, _ {1VMwANj  
                 ByRef in_flist() As String ) _Yqog/sG  
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    'Redimension the file list array =bgu2#%Z  
    Erase in_flist UZDXv=r|  
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    'Tracks how many files are found .KeZZLH  
    Dim fCount As Long xC}9W6  
    fCount = 0 zMI_8lNz  
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    'Recurse directory and search for text files JIH6!  
    Dim f As String 0<4Nf]i  
    f = Dir$(in_dir & "*.txt") dd6m/3uUW  
    While f <> "" 8}_M1w6v  
        ReDim Preserve in_flist(fCount) ;GF+0~5>  
        in_flist(fCount) = f Wm#F~
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        fCount += 1 +`]AutNv  
        f = Dir$() K@R * V  
    Wend |%~Zo:Q<$>  
    ReDim Preserve in_flist(fCount-1) QoBM2QYO  
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End Sub q7k
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