[分享]RPC Photonics扩散片BSDF [复制链接]

摘要：
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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。 <HQ&-jx  
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背景： ?@UAL.y  
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。 "'A"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。 |C D}<r(N  
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步骤 f1Zt?=  
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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。 7Fl-(Nv`  
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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） l~1AT%  
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 lLCdmxbT  
例如下所示： `o si"o9  
Sample name:  EDF-C1-56 J#7y< s  
Merging data from file EDF-C1-56 0-0.txt o:UXPAj  
Finished merging RPC data for sample EDF-C1-56 &p"(-  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt I7m
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4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 s'L?;:)dyB  
a. 创建一个新的散射库 irMd jG  
b. 散射模型命名 Ror2qDF  
c. 改变散射模型为“Tabulated BSDF”. (X}@^]lpa  
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 ） Y {c5  
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。 J&6: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， HC7JMj  
g. 点击OK .7Kk2Y  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 iP "EA8  
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脚本代码： <y>:B}9'  
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'#Language "WWB-COM" #D)x}#V\  
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Option Explicit ~HDdO3  
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Sub Main K{b-TT 4  
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    'Cleanup C5n?0I9  
    ClearOutputWindow() \9/1L?@  
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    Print "Merging RPC Photonics BSDF Data Files" eb!_ie"D  
    SetTextColor(255,0,0) f\K#>u* Q  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." qtzRCA!9(Z  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." AS;.sjgk  
    SetTextColor(0,0,0) uD)-V;}P@;  
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    'Current directory of this script (should be the same as the text files being merged) T:!MBWYe|  
    Dim cDir As String Sz0+<F#5  
    cDir = MacroDir$ & "\" wUp)JI  
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    'Array which will be populated with the list of files to be merged X\sm[_I  
    Dim fList() As String, curFile As String #Lka+l;L7  
    GetFileList( cDir, fList ) yFM>T\@  
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    Print "" 77Q}=80GU;  
    Print "Files found for merging:" Oif,|:  
    For Each curFile In fList I/p]DT  
        Print Chr(9) & curFile 59!)j>f  
    Next h&'
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. {}\CL#~y  
    Dim nameArray() As String, sampName As String `Q%NSU
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    nameArray = Split(fList(0)," 0-0.txt") ,Y!zORv<7  
    sampName  = nameArray(0) BaL]mIx  
    Print "" Z> 74.r  
    Print "Sample name: " & Chr(9) & sampName p&3> `C  
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    'Open an output file and write the FRED header data r nBOj#N  
    Dim outFile As String Do;#NLrWb  
    outFile = cDir & sampName & "_FRED.txt" JO1 ,TtA  
    Open outFile For Output As #1 x9V {R9_gf  
    Print #1, "type bsdf_data" |.w;r   
    Print #1, "format angles=deg bsdf=value scale=1" #T%zfcUj  
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    'Loop the file list, skip the two header lines and write the remaining data to file v0 ];W|  
    Dim lineArray() As String, curLine As Long -:]@HD:  
    For Each curFile In fList #IX&9 aFB}  
        Print "Merging data from file " & curFile wkikD  
        ReadFile( cDir & curFile, lineArray ) u!1/B4!'O  
        For curLine = 2 To UBound(lineArray) (@Zcx9  
            Print #1, lineArray(curLine) A3s57.Z]|  
        Next #x~_`>mDN  
    Next yGEb7I$h  
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    'Close the output file ;Qa;@  
    Close #1 &O tAAE  
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    Print "Finished merging RPC data for sample " & sampName o#e7,O  
    Print "FRED formatted data file: " & Chr(9) & outFile SE!L :  
End Sub z5EVG  
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'Utility function to read the contents of a file into an array of strings. 3*WS"bt  
Function ReadFile(ByVal fileName As String, _ I:t^S.,  
                  ByRef lineArray() As String) As Long H#+xKYrp  
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    ReadFile = -1 }m_t$aaUc1  
    Dim oFSO As Object T %/  
    Set oFSO = CreateObject("Scripting.FileSystemObject") uaxB -PZ  
    Erase lineArray rzV"Dm$'  
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    Dim fid As Long W)-hU~^OM  
    If oFSO.fileexists( fileName ) Then EUZq$@uWL  
        fid = FreeFile() %6]\^
 
        Open fileName For Input As fid U**)H_S/~  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) 0yTQ{'Cc  
        Close fid (C\r&N  
    End If !!+Da>  
    Set oFSO = Nothing P6we(I`"2  
    Return UBound( lineArray ) IJIQ" s  
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End Function *w 21U!  
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Sub GetFileList( ByVal in_dir As String, _ %EoH4LzT  
                 ByRef in_flist() As String ) f0FP9t3k  
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    'Redimension the file list array [B,p,Q"  
    Erase in_flist dXO=ZU/N  
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    'Tracks how many files are found qUg9$oh{LI  
    Dim fCount As Long Ky6+~>  
    fCount = 0 H:Lt$  
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    'Recurse directory and search for text files $WClpvVj  
    Dim f As String MCHOK=G  
    f = Dir$(in_dir & "*.txt")
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    While f <> "" Nm"<!a<F  
        ReDim Preserve in_flist(fCount) N(BiOLZL6  
        in_flist(fCount) = f x~Cz?ljbn  
        fCount += 1 q_pmwJ:UL  
        f = Dir$() SS0_P jKz  
    Wend K=o:V&  
    ReDim Preserve in_flist(fCount-1) OA5f}+  
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End Sub 7@@<5&mN  
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