[技术]RPC Photonics扩散片BSDF [复制链接]

摘要： ~?dPF;.6_  
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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。 "j9,3yJT  
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背景： Warz"n]iC  
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。 <UG}P \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。 5>7ECe*  
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步骤 lC.Yu$O5  
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1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下，选择“Raw data”文件。 Fy<dk}@  
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2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。（脚本代码放在了本文的最后） w1aa5-aF  
3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 (hVhzw"~  
例如下所示： \<~[uv'  
Sample name:  EDF-C1-56 bxO8q57  
Merging data from file EDF-C1-56 0-0.txt ?DkMzR)u  
Finished merging RPC data for sample EDF-C1-56 7[:9vY  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt ~d7!)c`z  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 DVRE;+Jt  
a. 创建一个新的散射库 H(!)]dO  
b. 散射模型命名 X#-U  
c. 改变散射模型为“Tabulated BSDF”. yuk64o2QE  
d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） NZ'S~Lr  
e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 KQ xKU?b1  
f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， :Cw|BX@??U  
g. 点击OK xe2Ap[Y'M  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 d$kGYMT"  
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脚本代码： 7Rk eV  
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'#Language "WWB-COM" G1vWHa7n;f  
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Option Explicit J-ACV(z=q  
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Sub Main WtFv"$V  
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    'Cleanup q/?#+d  
    ClearOutputWindow() ;4Y@xS2M  
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    Print "Merging RPC Photonics BSDF Data Files" 0CQ\e1S,#  
    SetTextColor(255,0,0) GNqw]@'Yf  
    Print "Note: Script should be located in the same folder as the BSDF TXT files."  s6rdQI]  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." 7<oLe3fbM  
    SetTextColor(0,0,0) ^~0\d;l_  
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    'Current directory of this script (should be the same as the text files being merged) uv}[MXOP  
    Dim cDir As String $&='&q  
    cDir = MacroDir$ & "\" pcv(P  
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    'Array which will be populated with the list of files to be merged UW<V(6P  
    Dim fList() As String, curFile As String $OHY^IE(  
    GetFileList( cDir, fList ) |%g^6RN  
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    Print "" g9H~\w  
    Print "Files found for merging:" OnC|9  
    For Each curFile In fList f:GZb?Wyd  
        Print Chr(9) & curFile B8'" ^a^&-  
    Next 9l@VxX68M  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 3lqR(Hh3  
    Dim nameArray() As String, sampName As String mZDrvTI'  
    nameArray = Split(fList(0)," 0-0.txt") 0iinr:=u  
    sampName  = nameArray(0) Di<KRg1W]}  
    Print "" Rgw\qOb  
    Print "Sample name: " & Chr(9) & sampName Xlpu_H|  
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    'Open an output file and write the FRED header data F"#bCnS  
    Dim outFile As String ><viJ$i  
    outFile = cDir & sampName & "_FRED.txt" ;WC]Lf<Z^  
    Open outFile For Output As #1 j08}5Eo  
    Print #1, "type bsdf_data" iJk`{P_  
    Print #1, "format angles=deg bsdf=value scale=1" E5UI  
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    'Loop the file list, skip the two header lines and write the remaining data to file RRqHo~*0  
    Dim lineArray() As String, curLine As Long **d3uc4y  
    For Each curFile In fList S "R]i  
        Print "Merging data from file " & curFile 5*xk8*  
        ReadFile( cDir & curFile, lineArray ) V{p*N*  
        For curLine = 2 To UBound(lineArray) r]sv50Fy  
            Print #1, lineArray(curLine) SG2s!Ht  
        Next E'?yI'~=  
    Next (GJ)FWen0"  
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    'Close the output file SEq_37  
    Close #1 <->Nex  
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    Print "Finished merging RPC data for sample " & sampName |G~LJsXW!v  
    Print "FRED formatted data file: " & Chr(9) & outFile Wjn1W;m&g  
End Sub 5m!FtHvm1  
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'Utility function to read the contents of a file into an array of strings. nPj%EKdY4  
Function ReadFile(ByVal fileName As String, _ <f&
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                  ByRef lineArray() As String) As Long 3k py3z[%  
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    ReadFile = -1 ,di'279|  
    Dim oFSO As Object $-[V
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    Set oFSO = CreateObject("Scripting.FileSystemObject") NOLw119K  
    Erase lineArray +pZ, RW.D  
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    Dim fid As Long (ec?_N0=  
    If oFSO.fileexists( fileName ) Then iY1%"x  
        fid = FreeFile() 9}Ud'#E  
        Open fileName For Input As fid <[ />M  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) ATp7:Q  
        Close fid 9E4H`[EQ  
    End If 0W<:3+|n4  
    Set oFSO = Nothing w$WN` =  
    Return UBound( lineArray ) K9B_o,  
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End Function v=
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Sub GetFileList( ByVal in_dir As String, _ 47.c  
                 ByRef in_flist() As String ) YQ9@Dk0R  
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    'Redimension the file list array Gx ci  
    Erase in_flist \Y&*sfQ  
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    'Tracks how many files are found ;UTT>j  
    Dim fCount As Long 6!bp;iLKy  
    fCount = 0 4nQk*:p(X  
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    'Recurse directory and search for text files +e?mKLw14  
    Dim f As String }CnqJ@>C5  
    f = Dir$(in_dir & "*.txt") P9=L?t.  
    While f <> "" *{8<4CVv  
        ReDim Preserve in_flist(fCount) T+ey>[  
        in_flist(fCount) = f 86NAa6BW  
        fCount += 1 wNMgY  
        f = Dir$() {WQH  
    Wend <`,pyvR Kv  
    ReDim Preserve in_flist(fCount-1) DFKFsu8s  
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End Sub .|[ZEXq