[技术]RPC Photonics扩散片BSDF [复制链接]

摘要： JLT':e~PX  
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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。 z=?ainnKx  
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背景： @H]g_yw [:  
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。 SXwgn >  
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。 p!hewtb5  
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步骤 v$+G_@  
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1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下，选择“Raw data”文件。 TG{=~2  
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2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。（脚本代码放在了本文的最后） .NQoqXR  
3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 %
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例如下所示： O JvEq@  
Sample name:  EDF-C1-56 !xj>~7  
Merging data from file EDF-C1-56 0-0.txt 0}Kl47}aD  
Finished merging RPC data for sample EDF-C1-56 riFE.;  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt 6;*tw i  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 }{=%j~V;&  
a. 创建一个新的散射库 ir \d8.  
b. 散射模型命名 cvn,&G-`  
c. 改变散射模型为“Tabulated BSDF”. ds5<4SLj  
d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） IW6;ZDP  
e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 :d)@|SR1  
f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， r>$jMo.S"  
g. 点击OK <%qbU-  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 r[EN`AxDb  
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脚本代码： KXicy_@DC`  
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'#Language "WWB-COM" 8$?a?7,>|  
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Option Explicit .'__ [|-{;  
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Sub Main dXrv  
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    'Cleanup n+Fl|4  
    ClearOutputWindow() 9.vHnMcq  
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    Print "Merging RPC Photonics BSDF Data Files" s7a\L=#p(  
    SetTextColor(255,0,0) 9R'rFI  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." pZjyzH{~  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." M#F;eK2pf  
    SetTextColor(0,0,0) cN&b$8O=%  
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    'Current directory of this script (should be the same as the text files being merged) 
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    Dim cDir As String QVzLf+R~  
    cDir = MacroDir$ & "\" JK[7&C-O  
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    'Array which will be populated with the list of files to be merged ;I5HMc_a"  
    Dim fList() As String, curFile As String 7/Ve=7]  
    GetFileList( cDir, fList ) U{i9h6b"18  
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    Print "" }v=q6C#Q>  
    Print "Files found for merging:"
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    For Each curFile In fList P(A%z2Ql  
        Print Chr(9) & curFile a/>={mbKi  
    Next -!w
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. '3%!Gi!g  
    Dim nameArray() As String, sampName As String Z{u*vUC&  
    nameArray = Split(fList(0)," 0-0.txt") !C#q  
    sampName  = nameArray(0) d:<{!}BR3  
    Print "" h'IBVI!P  
    Print "Sample name: " & Chr(9) & sampName gt}/C4|  
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    'Open an output file and write the FRED header data -I\_v*nA  
    Dim outFile As String s{<rc>  
    outFile = cDir & sampName & "_FRED.txt" 3smcCQA%  
    Open outFile For Output As #1 Q0ev*MS9Z  
    Print #1, "type bsdf_data" {PYN3\N,  
    Print #1, "format angles=deg bsdf=value scale=1" #t3ju^ |?  
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    'Loop the file list, skip the two header lines and write the remaining data to file 2 B5kpmH:  
    Dim lineArray() As String, curLine As Long _y5b>+  
    For Each curFile In fList aViJ?*  
        Print "Merging data from file " & curFile ke)3*.Y%C  
        ReadFile( cDir & curFile, lineArray ) 3#0nus|=S  
        For curLine = 2 To UBound(lineArray) '<4OA!,^)  
            Print #1, lineArray(curLine) D@O'8  
        Next ~mmI] p
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    Next WpSdukXY{  
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    'Close the output file 7m@pdq5Ub  
    Close #1 %# J8
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    Print "Finished merging RPC data for sample " & sampName BC!l)2  
    Print "FRED formatted data file: " & Chr(9) & outFile DRf~l9f  
End Sub 0&-!v?6)  
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'Utility function to read the contents of a file into an array of strings. N#]f?6*R  
Function ReadFile(ByVal fileName As String, _ ~>s^/`|?  
                  ByRef lineArray() As String) As Long lE=Q(QUr  
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    ReadFile = -1 l|j&w[c[Q0  
    Dim oFSO As Object oaRPYgh4  
    Set oFSO = CreateObject("Scripting.FileSystemObject") 2ORWdR.b  
    Erase lineArray ^_)CQ%W?  
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    Dim fid As Long URJ"  
    If oFSO.fileexists( fileName ) Then ruF+X)  
        fid = FreeFile() @oYTJd(v{  
        Open fileName For Input As fid -[Zau$;J<  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) N|7<*\o  
        Close fid j!:U*}f  
    End If |w /txn8G|  
    Set oFSO = Nothing /KlA7MH6  
    Return UBound( lineArray ) <Hm:#<\  
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End Function x1mxM#ql  
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Sub GetFileList( ByVal in_dir As String, _ 98o;_tU'  
                 ByRef in_flist() As String ) 5 MQRb?[  
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    'Redimension the file list array ukq9Cjs  
    Erase in_flist A 7DdUNR  
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    'Tracks how many files are found Mk,8v],-Tj  
    Dim fCount As Long 2MB\!fh  
    fCount = 0 b^hCm`2w*  
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    'Recurse directory and search for text files ,ulNap"R  
    Dim f As String rw_&t>Ri;  
    f = Dir$(in_dir & "*.txt")  Q+dBSKSK  
    While f <> "" cr,o<  
        ReDim Preserve in_flist(fCount) U|U/B  
        in_flist(fCount) = f #Yj0'bgK  
        fCount += 1 vlzjALy  
        f = Dir$() >fs-_>1d  
    Wend o)S>x0|[  
    ReDim Preserve in_flist(fCount-1) \mWXr*;  
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End Sub .7E-