[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： 9
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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。 Dwa.ZY}-  
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背景： M'sq{K9  
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。 s)-O{5;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。 ~gA^tc3G  
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步骤 :7L[v9'  
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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。 hEk0MY  
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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） /`+ubF
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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 O3En+m~3n)  
例如下所示： m_C#fR /I  
Sample name:  EDF-C1-56 Prqr,  
Merging data from file EDF-C1-56 0-0.txt )>r sX)  
Finished merging RPC data for sample EDF-C1-56 B{2WvPX~q  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt bS&XlgnKi  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 `+]e}*7$f  
a. 创建一个新的散射库 V:h3F7  
b. 散射模型命名 fb_q2p} G  
c. 改变散射模型为“Tabulated BSDF”. N@3&e;y  
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 ）
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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 % 0c{E~  
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， `6FH@" |I  
g. 点击OK /:+MUw7~  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 (3 ]!ZV  
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脚本代码： z *~rd2  
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'#Language "WWB-COM" yGE)EBH  
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Option Explicit 3dB{DuQ  
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Sub Main sL4+O P-
 
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    'Cleanup jVInTR0f[  
    ClearOutputWindow() Gi Max  
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    Print "Merging RPC Photonics BSDF Data Files" '~n=<Y  
    SetTextColor(255,0,0) 3bZ:*6W.6  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." M2piJ'T4u  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." LR%P\~  
    SetTextColor(0,0,0) t`G<}t  
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    'Current directory of this script (should be the same as the text files being merged) o!sHK9hvJ)  
    Dim cDir As String JTdcLmL  
    cDir = MacroDir$ & "\" f,:2\b?.  
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    'Array which will be populated with the list of files to be merged sZ%wQqy~k  
    Dim fList() As String, curFile As String 2^ kK2D$o  
    GetFileList( cDir, fList ) GEZ!z5";BQ  
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    Print "" }ZkGH}K_}  
    Print "Files found for merging:" z18<rj  
    For Each curFile In fList m:5x"o7)ln  
        Print Chr(9) & curFile m?]= =9  
    Next oG' 'my#3  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 4ad-'  
    Dim nameArray() As String, sampName As String UmOK7SPi  
    nameArray = Split(fList(0)," 0-0.txt") R0bWI`$Z  
    sampName  = nameArray(0) f (ug3(j  
    Print "" )g[7XB/w  
    Print "Sample name: " & Chr(9) & sampName q|S,^0cU  
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    'Open an output file and write the FRED header data M(#]NTr ~4  
    Dim outFile As String E#/vgm=W;  
    outFile = cDir & sampName & "_FRED.txt" 9B2`FJ  
    Open outFile For Output As #1 mL]5Tnc  
    Print #1, "type bsdf_data" Q0(3ps~H  
    Print #1, "format angles=deg bsdf=value scale=1" jGFDj"Y  
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    'Loop the file list, skip the two header lines and write the remaining data to file C0-,<X  
    Dim lineArray() As String, curLine As Long h45RwQ5Z  
    For Each curFile In fList Dt Ry%fA_  
        Print "Merging data from file " & curFile EBx!q8zz  
        ReadFile( cDir & curFile, lineArray ) TM0DR'.  
        For curLine = 2 To UBound(lineArray) Rkh ^|_<!  
            Print #1, lineArray(curLine) p0@l581  
        Next RxXiSc`^z  
    Next 0w ;#4X:m  
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    'Close the output file % QI6`@Y"  
    Close #1 d1hXzJs  
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    Print "Finished merging RPC data for sample " & sampName Vo(V<2lw}  
    Print "FRED formatted data file: " & Chr(9) & outFile `!7QegJa"  
End Sub @+(a{%~7y  
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'Utility function to read the contents of a file into an array of strings. B+2Jea,N  
Function ReadFile(ByVal fileName As String, _ _{48s8V  
                  ByRef lineArray() As String) As Long mFJb9,  
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    ReadFile = -1 u\P)x~-TM  
    Dim oFSO As Object ^ Mw=!n[  
    Set oFSO = CreateObject("Scripting.FileSystemObject") .tt=\R  
    Erase lineArray &T[BS;  
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    Dim fid As Long VQHQvFRZ)  
    If oFSO.fileexists( fileName ) Then avEsX
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        fid = FreeFile() m_,j)A%  
        Open fileName For Input As fid p^i]{"sjbU  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) /<it2=  
        Close fid VIg=|Oe),  
    End If k=JT%  
    Set oFSO = Nothing 'QxPQcU  
    Return UBound( lineArray ) ,7*-%05[\  
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End Function q.69<Rs  
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Sub GetFileList( ByVal in_dir As String, _ OvtiFN^s'  
                 ByRef in_flist() As String ) 9Li.B1j  
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    'Redimension the file list array MD=VR(P?eq  
    Erase in_flist dxF/]>t  
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    'Tracks how many files are found ;+4X<)y*>  
    Dim fCount As Long 2mVLR;s{_  
    fCount = 0 OCYC Dn  
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    'Recurse directory and search for text files W.VyH|?  
    Dim f As String j aq/]I7  
    f = Dir$(in_dir & "*.txt") 8WRxM%gsH  
    While f <> "" uq_h8JH$  
        ReDim Preserve in_flist(fCount) R22P ol
 
        in_flist(fCount) = f Mq2[^l!qu  
        fCount += 1 nO7#m~  
        f = Dir$() wO3K2I]>0  
    Wend z]F4Z'(e.  
    ReDim Preserve in_flist(fCount-1) fE&wtw{gi  
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End Sub >"z&KZKI  
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