[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： 1#*^+A E  
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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。 ,vo]WIQ\:  
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背景： 86eaX+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。 )%b 5uZ  
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。 H& $M/`  
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步骤 nly}ly 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。 c_>AbF{  
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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） M?=I{}!@Q  
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 P+y XC^ ,  
例如下所示： &JYkh >  
Sample name:  EDF-C1-56 OnU-FX<  
Merging data from file EDF-C1-56 0-0.txt r7#.DJnN.  
Finished merging RPC data for sample EDF-C1-56 F2MC)&#  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt WFzM s  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 >5E1y!  
a. 创建一个新的散射库 K%_UNivN  
b. 散射模型命名
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c. 改变散射模型为“Tabulated BSDF”. 0176  
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 ） Mnk-"d  
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。 `e`DSl D>  
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， XwfR/4  
g. 点击OK ?p/}eRgi  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 DAg*  
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脚本代码： W]Nc6B*gI  
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'#Language "WWB-COM" 7SN61)[m  
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Option Explicit &*E! %57  
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Sub Main 7KGb2V<t  
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    'Cleanup i`Qa7  
    ClearOutputWindow() 15En$6>  
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    Print "Merging RPC Photonics BSDF Data Files" e2BC2K0  
    SetTextColor(255,0,0) x4MTE?hT  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." /fLm )vN  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." Q1{9>NI  
    SetTextColor(0,0,0) $RB p!7  
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    'Current directory of this script (should be the same as the text files being merged) KX3A|
  
    Dim cDir As String @y'ZM  
    cDir = MacroDir$ & "\" I}f7|hYX  
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    'Array which will be populated with the list of files to be merged *0?@/2&  
    Dim fList() As String, curFile As String /2hRLyeAZ  
    GetFileList( cDir, fList ) ^16zZ*
 
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    Print "" fYzP4  
    Print "Files found for merging:" o2hk!#5[4  
    For Each curFile In fList 3IjsV5a  
        Print Chr(9) & curFile Vy|4k2
 
    Next s? Xgo&rS_  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. ?=^\kXc[  
    Dim nameArray() As String, sampName As String Gg]Jp:GF  
    nameArray = Split(fList(0)," 0-0.txt") [k(b<'  
    sampName  = nameArray(0) \t/0Yh-'  
    Print "" tl*h"du^  
    Print "Sample name: " & Chr(9) & sampName Mu-kvgO`L  
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    'Open an output file and write the FRED header data &cJ?mSI  
    Dim outFile As String ~'0ZW<X.  
    outFile = cDir & sampName & "_FRED.txt" 61_-G#W  
    Open outFile For Output As #1 )''V}Zn.X  
    Print #1, "type bsdf_data" q_ryW$/_  
    Print #1, "format angles=deg bsdf=value scale=1" _%Ua8bR$  
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    'Loop the file list, skip the two header lines and write the remaining data to file 3:8p="$F  
    Dim lineArray() As String, curLine As Long En#Q p3  
    For Each curFile In fList bBXLW}W  
        Print "Merging data from file " & curFile &['x+vL9  
        ReadFile( cDir & curFile, lineArray ) "wg$ H1K  
        For curLine = 2 To UBound(lineArray) h^qZi@L  
            Print #1, lineArray(curLine) :vx<m_  
        Next Q$ Dx:  
    Next A%7f;&x!  
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    'Close the output file V82I%gPF  
    Close #1 "frioi`a2  
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    Print "Finished merging RPC data for sample " & sampName =J]EVD   
    Print "FRED formatted data file: " & Chr(9) & outFile 4zt:3bWU  
End Sub D/ sYH0.V$  
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'Utility function to read the contents of a file into an array of strings. 4\p%|G^hU  
Function ReadFile(ByVal fileName As String, _ ?*yB&(a:8  
                  ByRef lineArray() As String) As Long N
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    ReadFile = -1 wfEL .h  
    Dim oFSO As Object )G?\{n-  
    Set oFSO = CreateObject("Scripting.FileSystemObject") tg==Qgz  
    Erase lineArray guGX  G+  
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    Dim fid As Long $pAVTz  
    If oFSO.fileexists( fileName ) Then 5 r_Z3/%  
        fid = FreeFile() }{=}^c"t'  
        Open fileName For Input As fid ($/l_F  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) S w%6-  
        Close fid )bL(\~0g~  
    End If jpS$5Ct  
    Set oFSO = Nothing U{bv|vF  
    Return UBound( lineArray ) Fj2z$  
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End Function  :TR:tf  
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Sub GetFileList( ByVal in_dir As String, _  bKK'U4  
                 ByRef in_flist() As String ) -sZ'<(3  
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    'Redimension the file list array "+Ys}t~2  
    Erase in_flist 7CSz  
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    'Tracks how many files are found 8 l)K3;q_  
    Dim fCount As Long <uJ {>~  
    fCount = 0 e
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    'Recurse directory and search for text files i>[xN[U(  
    Dim f As String t']/2m.&p  
    f = Dir$(in_dir & "*.txt") <nG}]Smd7  
    While f <> "" o<Mccj  
        ReDim Preserve in_flist(fCount) _e;bB?S  
        in_flist(fCount) = f w+)wrJTtm  
        fCount += 1 -64;P9:A>  
        f = Dir$() \lQI;b;$  
    Wend EW vhT]<0  
    ReDim Preserve in_flist(fCount-1) }cGILH%  
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End Sub m9MYd  
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