[技术]RPC Photonics扩散片BSDF [复制链接]

摘要： >_#A*B|  
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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。 ?es9
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背景： H? %I((+  
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。 W6)XMl}n  
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。 Sq5}v]k@&  
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步骤 !-7<x"avm  
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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。 u$ vLwJ|o  
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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） t4p-pH'9b  
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 {;38&Izwz  
例如下所示： Q@s G6iz  
Sample name:  EDF-C1-56 m[w~h\FS  
Merging data from file EDF-C1-56 0-0.txt 'h>l_A
 
Finished merging RPC data for sample EDF-C1-56 [
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FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt }]pOR&o  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 cr!sq.)s  
a. 创建一个新的散射库 v){X&HbP  
b. 散射模型命名 r3Yf
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c. 改变散射模型为“Tabulated BSDF”. 2bf#L?5g/  
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 ） "9RW<+  
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。 5(DnE?}vo  
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， `J}FSUn\  
g. 点击OK bR=TGL&  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 K&&YxX~3  
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脚本代码： 602=qb  
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'#Language "WWB-COM" E;r~8^9)  
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Option Explicit \qbEC.-K  
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Sub Main (k %0|%eR  
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    'Cleanup !_:|mu'  
    ClearOutputWindow() ^p~3H  
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    Print "Merging RPC Photonics BSDF Data Files" k= 9a/M u  
    SetTextColor(255,0,0) Wp=:|J  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." 1gH>B5`  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." -vS7%Fbr  
    SetTextColor(0,0,0) 68!=`49r>  
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    'Current directory of this script (should be the same as the text files being merged) v
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    Dim cDir As String i^/D_L.  
    cDir = MacroDir$ & "\" .7H*F9  
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    'Array which will be populated with the list of files to be merged H.TPKdVX  
    Dim fList() As String, curFile As String v?4MndR  
    GetFileList( cDir, fList ) I=V]_Ik4N  

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    Print "" |R>I#NO5  
    Print "Files found for merging:" J]Qbg
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    For Each curFile In fList Z9lfd6MU,  
        Print Chr(9) & curFile K9UWyM<(2C  
    Next "cX*GTNi8  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 8KS9!*.iZ  
    Dim nameArray() As String, sampName As String sKOy6v  
    nameArray = Split(fList(0)," 0-0.txt") ZSW`/}Dp;  
    sampName  = nameArray(0) CA ,0Fe3  
    Print "" tJ9`Ys  
    Print "Sample name: " & Chr(9) & sampName E9S&UU,K  
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    'Open an output file and write the FRED header data RkBbu4uQ-  
    Dim outFile As String .Ue1}'v*,  
    outFile = cDir & sampName & "_FRED.txt" p"/B3  
    Open outFile For Output As #1 ^1+&)6s7V  
    Print #1, "type bsdf_data" zI3Bb?4.  
    Print #1, "format angles=deg bsdf=value scale=1" qn@:A2ed  
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    'Loop the file list, skip the two header lines and write the remaining data to file V|bN<BYJ  
    Dim lineArray() As String, curLine As Long 0Bhf(5  
    For Each curFile In fList TfqQh!Y  
        Print "Merging data from file " & curFile $Z^HI  
        ReadFile( cDir & curFile, lineArray ) "4qv yVOE  
        For curLine = 2 To UBound(lineArray) {KalVZX2R  
            Print #1, lineArray(curLine) c*x5t"{  
        Next k-\RdX)E  
    Next Zae$M0)  
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    'Close the output file [0mg\n?  
    Close #1 )k|_ CW~  
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    Print "Finished merging RPC data for sample " & sampName F]~>qt<ia  
    Print "FRED formatted data file: " & Chr(9) & outFile #Y9~ Xp^.  
End Sub TwXqk>J  
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'Utility function to read the contents of a file into an array of strings. ln6Hr^@5  
Function ReadFile(ByVal fileName As String, _ cp
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                  ByRef lineArray() As String) As Long J.QFrIB{]+  
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    ReadFile = -1 X,8]g.<  
    Dim oFSO As Object V}kQXz"9  
    Set oFSO = CreateObject("Scripting.FileSystemObject")  mVuZ}`  
    Erase lineArray vmZyvJSE  
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    Dim fid As Long ix]t>2r  
    If oFSO.fileexists( fileName ) Then UMbM3m=\  
        fid = FreeFile() _]whHS+  
        Open fileName For Input As fid 3Rsbi  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) na1*^S`[  
        Close fid G>);8T%l  
    End If oMV<Yn_<  
    Set oFSO = Nothing &%Lps_+fJ  
    Return UBound( lineArray ) '{?7\+o.x  
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End Function /!mF,oR!  
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Sub GetFileList( ByVal in_dir As String, _ 9c@."O`  
                 ByRef in_flist() As String ) 6eh\-+=  
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    'Redimension the file list array $Dm2>:D
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    Erase in_flist 'dstAlt?  
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    'Tracks how many files are found  ]%L?b-e  
    Dim fCount As Long  bK|I  
    fCount = 0 VNcxST15a  
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    'Recurse directory and search for text files B~RVFc +  
    Dim f As String ;5bzXW#U  
    f = Dir$(in_dir & "*.txt") .A. VOf_  
    While f <> "" +I {ZW}rA  
        ReDim Preserve in_flist(fCount) %9!,PeRe  
        in_flist(fCount) = f ^"e|)4_5\  
        fCount += 1 NM;0@
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        f = Dir$() .MzVc42<  
    Wend '*~_!lE5  
    ReDim Preserve in_flist(fCount-1) 5DEK`#*  
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End Sub 1@)kNg)*$