[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： g"60{  
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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。 C/J
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背景： 8fn7!  
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。 |r]f2Mrm  
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。 f1a >C  
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步骤 {M7`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。 oBA]qI  
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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） JQ>GKu~  
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 JJ50(
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例如下所示： PY4RwN  
Sample name:  EDF-C1-56 fQ\nK H~  
Merging data from file EDF-C1-56 0-0.txt ^V DJGBk  
Finished merging RPC data for sample EDF-C1-56 B@:c8}2.  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt BZ]6W/0  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 ElAho3W  
a. 创建一个新的散射库 `]Uu`b  
b. 散射模型命名 LqH<HGMFD  
c. 改变散射模型为“Tabulated BSDF”. &B^zu+J  
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 ） p19[qy~.  
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},IQ,Az:Z  
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， (RDY-~#~  
g. 点击OK kWF/SsE  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 >@NH Al  
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脚本代码： fn%Gu s~  
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'#Language "WWB-COM" %idn7STJ}  
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Option Explicit n{>Ge,enP0  
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Sub Main r/X4Hy0!lT  
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    'Cleanup b`NXe7A  
    ClearOutputWindow() hX-([
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    Print "Merging RPC Photonics BSDF Data Files" z (N3oBW  
    SetTextColor(255,0,0) E8TJ*ZU  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." hSxlj7Eo^T  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." !]%M  
    SetTextColor(0,0,0) IETdL{`~  
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    'Current directory of this script (should be the same as the text files being merged) L<kIzB !  
    Dim cDir As String Kn9O=?Xh;  
    cDir = MacroDir$ & "\" zW`Zmt\T2  
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    'Array which will be populated with the list of files to be merged jlmP1b9  
    Dim fList() As String, curFile As String ;j#$d@VG"  
    GetFileList( cDir, fList ) <b-BJ2],k  
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    Print "" 5ryzAB O\2  
    Print "Files found for merging:" '}3m('u  
    For Each curFile In fList Fq{Z-yVp  
        Print Chr(9) & curFile [x{S ,?6  
    Next sU {'  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. '%W'HqVcG1  
    Dim nameArray() As String, sampName As String ;z6Gk&?  
    nameArray = Split(fList(0)," 0-0.txt") kmJ{(y)w  
    sampName  = nameArray(0) A),nkw0X  
    Print "" 2<dl23  
    Print "Sample name: " & Chr(9) & sampName kzA%.bP|  
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    'Open an output file and write the FRED header data s\c*ibxM,  
    Dim outFile As String P;&rh U^[  
    outFile = cDir & sampName & "_FRED.txt" -1tdyCez  
    Open outFile For Output As #1 QN%w\JXS  
    Print #1, "type bsdf_data" 2gn*B$a  
    Print #1, "format angles=deg bsdf=value scale=1" "W_C%elg  
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    'Loop the file list, skip the two header lines and write the remaining data to file !i0jk,[B=  
    Dim lineArray() As String, curLine As Long VS$ZR'OP0  
    For Each curFile In fList /h4 ::,  
        Print "Merging data from file " & curFile E,Q>jH  
        ReadFile( cDir & curFile, lineArray ) 8\-Q(9q(  
        For curLine = 2 To UBound(lineArray) m6%csh-N1  
            Print #1, lineArray(curLine) +/A`\9QT  
        Next t6.hg3Y  
    Next +39Vxe:Oy  
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    'Close the output file ],*^wQ
 
    Close #1 _":yUa0D  
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    Print "Finished merging RPC data for sample " & sampName > ,L'A;c}  
    Print "FRED formatted data file: " & Chr(9) & outFile Mr}]P(4h  
End Sub cD-.thHO  
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'Utility function to read the contents of a file into an array of strings. 9N9dQ}[:g  
Function ReadFile(ByVal fileName As String, _ ;T0Y=yC  
                  ByRef lineArray() As String) As Long lYlU8l5>  
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    ReadFile = -1 39;Z+s";  
    Dim oFSO As Object SrV+Ox  
    Set oFSO = CreateObject("Scripting.FileSystemObject") :kycIM]s  
    Erase lineArray I0 y+,~\  
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    Dim fid As Long N0be=IO5#  
    If oFSO.fileexists( fileName ) Then o.tCw\M$g  
        fid = FreeFile() K\ww,S  
        Open fileName For Input As fid /Kmzi9j+  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) 1sFTXl  
        Close fid +):t6oX|  
    End If 5YJn<XEc  
    Set oFSO = Nothing
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    Return UBound( lineArray ) K 7)1wiEj  
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End Function Si<9Oh  
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Sub GetFileList( ByVal in_dir As String, _ GyV3]Qqj  
                 ByRef in_flist() As String ) -GkNA"2M[  
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    'Redimension the file list array H'myd=*h~8  
    Erase in_flist ||y5XXs  
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    'Tracks how many files are found IxT[1$e  
    Dim fCount As Long Bcx-t)[  
    fCount = 0 j
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    'Recurse directory and search for text files hWK}] gF  
    Dim f As String bS{7*S  
    f = Dir$(in_dir & "*.txt") wiWpzJz  
    While f <> "" Hz$l)g}
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        ReDim Preserve in_flist(fCount) >;',U<Wd  
        in_flist(fCount) = f N> RabD  
        fCount += 1 r}
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        f = Dir$() v}hmI']yf  
    Wend eqcV70E8cK  
    ReDim Preserve in_flist(fCount-1) lkf(t&vL2  
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End Sub l-"c-2-!  
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