[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： <(lA C
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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。 _K~h? \u  
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背景： }R['Zoh4I  
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。 aDNB~CwZZ  
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。 sg $db62>  
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步骤 f)/Z7*Z  
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1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下，选择“Raw data”文件。 fkzSX8a9}  
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2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。（脚本代码放在了本文的最后） y d97ys  
3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 <xy@%  
例如下所示： 4!Js="  
Sample name:  EDF-C1-56 ^&
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Merging data from file EDF-C1-56 0-0.txt l/X_CM8y~  
Finished merging RPC data for sample EDF-C1-56 AatSN@,~z  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt +NPL.b|  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 Lj1l]OD  
a. 创建一个新的散射库 wX"hUu  
b. 散射模型命名 Ht Fr(g\"$  
c. 改变散射模型为“Tabulated BSDF”. ~$HB}/  
d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） m+Ye`]  
e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 l$;"yVdks  
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， I@'[>t  
g. 点击OK K&L!O3#(  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 X8|H5Y:  

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脚本代码： JtL>mH  
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'#Language "WWB-COM" \]tBwa  
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Option Explicit A5XMA|2_  
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Sub Main k)p`x"To  
} !m43x/&  
    'Cleanup Z,).)y#B  
    ClearOutputWindow() 6R6Ub 0  
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    Print "Merging RPC Photonics BSDF Data Files" E`IXBI  
    SetTextColor(255,0,0) ;p(h!4E  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." B5lwQp]  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." nh} Xu~#_  
    SetTextColor(0,0,0) R}&?9tVRR  
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    'Current directory of this script (should be the same as the text files being merged) ;,4*uU'vq  
    Dim cDir As String -H-U8/WC  
    cDir = MacroDir$ & "\" #I/P9)4  
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    'Array which will be populated with the list of files to be merged Th)
  
    Dim fList() As String, curFile As String Y <6|z3  
    GetFileList( cDir, fList ) CsO!Y\'FY  
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    Print "" "<CM'R  
    Print "Files found for merging:" F]$ Nu  
    For Each curFile In fList m%HT)`>bg  
        Print Chr(9) & curFile 2f,8Jnia  
    Next dN{
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. noZbsI4  
    Dim nameArray() As String, sampName As String O=0p}{3l  
    nameArray = Split(fList(0)," 0-0.txt") bfxE}>  
    sampName  = nameArray(0) }LUvh  
    Print "" PUdv1__C  
    Print "Sample name: " & Chr(9) & sampName ng1E'c]0@  
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    'Open an output file and write the FRED header data q*hn5K*  
    Dim outFile As String W5|{A])N  
    outFile = cDir & sampName & "_FRED.txt" t~+M>Fjm?d  
    Open outFile For Output As #1 =M\yh,s!  
    Print #1, "type bsdf_data" fv;Q*; oC&  
    Print #1, "format angles=deg bsdf=value scale=1" ,1-%C)  
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    'Loop the file list, skip the two header lines and write the remaining data to file {]CZgqE{  
    Dim lineArray() As String, curLine As Long (m/:B=K  
    For Each curFile In fList 1-kuK<KR  
        Print "Merging data from file " & curFile 529;_|  
        ReadFile( cDir & curFile, lineArray ) (XZ[-M7  
        For curLine = 2 To UBound(lineArray) e{)giJY9  
            Print #1, lineArray(curLine) W|PAI[N  
        Next o@Ye_aM~?Y  
    Next jFSR+mP!  
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    'Close the output file 1$*8F  
    Close #1 +t7HlAXB#  
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    Print "Finished merging RPC data for sample " & sampName 8lF9LZ8  
    Print "FRED formatted data file: " & Chr(9) & outFile [L%Ltmx  
End Sub mR0`wrt  
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'Utility function to read the contents of a file into an array of strings. WIWo4[(  
Function ReadFile(ByVal fileName As String, _ ]3,'U(!+  
                  ByRef lineArray() As String) As Long !r/i<~'Bx  
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    ReadFile = -1 #$WnMJ@  
    Dim oFSO As Object rZI63S  
    Set oFSO = CreateObject("Scripting.FileSystemObject") %`Ce#b()'  
    Erase lineArray (B#FLoK  
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    Dim fid As Long htB2?%S=T  
    If oFSO.fileexists( fileName ) Then ]OpGD5jZ  
        fid = FreeFile() HNZ$CaJh  
        Open fileName For Input As fid E~y8X9HZ)  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) igu1s}F  
        Close fid qnP4wRpr  
    End If <@J$hs9s  
    Set oFSO = Nothing g~<[;6&{  
    Return UBound( lineArray ) U]Q5};FK  
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End Function 49"C'n0wST  
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Sub GetFileList( ByVal in_dir As String, _ wBt7S!>G  
                 ByRef in_flist() As String ) N XB8u6  
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    'Redimension the file list array TOiLv.Dor  
    Erase in_flist [n9l[dN  
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    'Tracks how many files are found ZK4V-?/[6  
    Dim fCount As Long AO<T6VK  
    fCount = 0 N[@~q~v  
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    'Recurse directory and search for text files 5bb#{?2i  
    Dim f As String /`cy4<  
    f = Dir$(in_dir & "*.txt") 6jpzyf=~  
    While f <> "" \Fjasz5E'  
        ReDim Preserve in_flist(fCount) :[a*I6/^  
        in_flist(fCount) = f g9C-!X-<T  
        fCount += 1 %)V=)l.j  
        f = Dir$() 6$"IeBRO  
    Wend IB|!51H  
    ReDim Preserve in_flist(fCount-1) Rd8mn'A  
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End Sub fBX@ MedC  
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