[技术]RPC Photonics扩散片BSDF [复制链接]

摘要： JXt_
  
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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。 g{>0Pa1?C  
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背景： ,5T1QWn^f  
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。 Tgla_sMb  
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。 8NNs_~+x}  
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步骤  O^
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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。 _2<UcC~  
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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） v7hw%9(=  
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 VKlC`k8L  
例如下所示： KCp9P2kv.  
Sample name:  EDF-C1-56 a>d`g
 
Merging data from file EDF-C1-56 0-0.txt GZuWAa  
Finished merging RPC data for sample EDF-C1-56 JIYzk]Tj  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt |-cXb.M[  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 mxpw4  
a. 创建一个新的散射库 7@k3-?q  
b. 散射模型命名 !4Sd^"  
c. 改变散射模型为“Tabulated BSDF”. H,7!"!?@N  
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 ） s bR*[2  
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。 im)r4={ 9  
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， udc9KuR@  
g. 点击OK )7#3n(_np  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 '0o^T 7C  
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脚本代码： ,Qo:]
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'#Language "WWB-COM" z/p^C~|}  
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Option Explicit MJH>rsTQ  
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Sub Main q['3M<q  
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    'Cleanup 6o(.zk`d  
    ClearOutputWindow() J*:_3Wsy  
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    Print "Merging RPC Photonics BSDF Data Files" ' eWG v  
    SetTextColor(255,0,0) j+gh*\:q  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." l0ZK)  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." `f
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    SetTextColor(0,0,0) +br' 2Pn  
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    'Current directory of this script (should be the same as the text files being merged) DFRgn  
    Dim cDir As String i3$G)W  
    cDir = MacroDir$ & "\" Pj BBXI1i  
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    'Array which will be populated with the list of files to be merged "WbKhE  
    Dim fList() As String, curFile As String CC$rt2\e  
    GetFileList( cDir, fList ) fgF@ x  
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    Print "" :DuEv:;v  
    Print "Files found for merging:" /_8nZVu  
    For Each curFile In fList rH\oFCzC  
        Print Chr(9) & curFile z-sq9Qp&x  
    Next INCD5dihJ  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. r5$!41   
    Dim nameArray() As String, sampName As String n%02,pC6,  
    nameArray = Split(fList(0)," 0-0.txt") zx+}>(U\U  
    sampName  = nameArray(0) i!(5y>I_  
    Print "" xsS;<uCD  
    Print "Sample name: " & Chr(9) & sampName <'hoN/g  
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    'Open an output file and write the FRED header data (b"q(:5oX  
    Dim outFile As String #%#N.tB5  
    outFile = cDir & sampName & "_FRED.txt" *#?9@0b@  
    Open outFile For Output As #1 ^i3!1cS  
    Print #1, "type bsdf_data" B=}QgXg  
    Print #1, "format angles=deg bsdf=value scale=1" Kf,AnKkn'  
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    'Loop the file list, skip the two header lines and write the remaining data to file T5:xia>8O  
    Dim lineArray() As String, curLine As Long 3mg:9]X9  
    For Each curFile In fList iorQ/(  
        Print "Merging data from file " & curFile `
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        ReadFile( cDir & curFile, lineArray ) 45jImCm  
        For curLine = 2 To UBound(lineArray) $_\x}`c~.  
            Print #1, lineArray(curLine) #2Iw%H2q&  
        Next pRjrMS  
    Next q
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    'Close the output file cveQ6 -`K  
    Close #1 Cj YI*  
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    Print "Finished merging RPC data for sample " & sampName [ThAvQ_$  
    Print "FRED formatted data file: " & Chr(9) & outFile uy<b5.!-  
End Sub >S{8sN
 
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'Utility function to read the contents of a file into an array of strings. (>lH=&%zj  
Function ReadFile(ByVal fileName As String, _ w:R#F( 'B  
                  ByRef lineArray() As String) As Long w:=:D=xH2  
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    ReadFile = -1 zzd PR}VG  
    Dim oFSO As Object WHUl.h  
    Set oFSO = CreateObject("Scripting.FileSystemObject") O+=}x]q*y  
    Erase lineArray 7(|f@Y~*  
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    Dim fid As Long J5xZLv  
    If oFSO.fileexists( fileName ) Then ^^a%Lz)U  
        fid = FreeFile() VG50n<m9  
        Open fileName For Input As fid s |o(~2j  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) >>8{N)c5E  
        Close fid T&Z
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    End If 'tX}6wurf  
    Set oFSO = Nothing KYz@H#M  
    Return UBound( lineArray ) j;-2)ZLm  
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End Function LIyb+rH#yg  
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Sub GetFileList( ByVal in_dir As String, _ eIhfhz?Q;#  
                 ByRef in_flist() As String ) HJlxpX$_  
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    'Redimension the file list array MfdkvJ'  
    Erase in_flist D^f;X.Qm  
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    'Tracks how many files are found ~I~lb/  
    Dim fCount As Long M(^ e)7a1  
    fCount = 0 l?Ls=J*  
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    'Recurse directory and search for text files VS_I'SPPIc  
    Dim f As String ?H_>?,^  
    f = Dir$(in_dir & "*.txt") 4B
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    While f <> "" S?c<Lf~W  
        ReDim Preserve in_flist(fCount) "x 3C3Zu.;  
        in_flist(fCount) = f ]c6h'}  
        fCount += 1 S/YHT)0x[  
        f = Dir$() K=pG,[ChA  
    Wend z2#k/3%o=  
    ReDim Preserve in_flist(fCount-1) :0bjPQj  
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End Sub ]x%sX|Rj