[技术]RPC Photonics扩散片BSDF [复制链接]

摘要： fo*!a$)  
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RPC Photonics公司有高品质的的工程漫射体BSDF测试数据，但它对于FRED帮助甚少，下面这个步骤描述了如何利用FRED脚本转换RPC Photonics提供的TXT文件，并将数据直接应用到FRED的Tabulated scatter 散射模型。 -5o?#%  
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背景： RlPjki"M
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Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术，可以解决其他技术的不足，大大改善了诸如光刻系统、有效固态照明，显示，背光，显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体（Engineered DiffusersTM）的新概念，与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同，工程漫射体要求对于每个散射中心，通常为微透镜单元，都进行控制。例如全息漫射体可以视为一组随机排列的透镜，但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制：而无法单独操控每个微透镜单元，这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面，在工程漫射体中，每个微透镜单元形成漫射体，由其凹形纵断面和在阵列中的位置所确定。同时，为了确保漫射体不受输入光束变化的影响，并且不产生衍射效果，微透镜单元的分布是随机的，根据产生相应的光束形状函数所选取的概率分布函数来确定。因此，工程漫射体同时保留了随机与确定性漫射体的优点，从而实现高性能的光束整形功能。 1XQ87~  
FRED是美国Photon Engineering 公司开发的光学工程仿真软件，其在杂散光分析中独特的算法、高效的准确性，使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 _pJX1_vD  
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步骤 N4' .a=1  
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1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下，选择“Raw data”文件。 `Nkx7Z~w:  
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2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。（脚本代码放在了本文的最后） W5T
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3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 pn+D@x#IA  
例如下所示： 4;08n|C  
Sample name:  EDF-C1-56 Qh/lT$g  
Merging data from file EDF-C1-56 0-0.txt :m)c[q8  
Finished merging RPC data for sample EDF-C1-56 X5|?/aR}  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt "pR $cS  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 _CHKh*KHML  
a. 创建一个新的散射库 !d/`[9j
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b. 散射模型命名 [''=><  
c. 改变散射模型为“Tabulated BSDF”. [ e$]pN%  
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 ） G1
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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。 ( ?atGFgu  
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， h\Z3yAYd  
g. 点击OK (M4]#5  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 .0rJIO  
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脚本代码： \xy:6gd:  
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'#Language "WWB-COM" A;K{&x  
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Option Explicit QSO5 z2|  
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Sub Main LPtx|Sx![  
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    'Cleanup wCqE4i  
    ClearOutputWindow() :DF`A(  
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    Print "Merging RPC Photonics BSDF Data Files" **"zDY*?W  
    SetTextColor(255,0,0) lsTe*Od  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." Lx|w~+k}  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." ,:\zXESy4  
    SetTextColor(0,0,0) 37GHt9l  
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    'Current directory of this script (should be the same as the text files being merged) }s8*QfK>  
    Dim cDir As String Z3&XTsq  
    cDir = MacroDir$ & "\" M)bC%(xJ  
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    'Array which will be populated with the list of files to be merged 3/]f4D{MMY  
    Dim fList() As String, curFile As String X7(rg W8  
    GetFileList( cDir, fList ) So3,Z'z=  
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    Print "" ^v()iF !  
    Print "Files found for merging:" aC $h_  
    For Each curFile In fList bYRQI=gW':  
        Print Chr(9) & curFile 4c493QOd  
    Next 67EDkknt  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. y0W`E/1t  
    Dim nameArray() As String, sampName As String /0'fcjOaQ  
    nameArray = Split(fList(0)," 0-0.txt") 5cv, >{~5  
    sampName  = nameArray(0) ~XN]?5GQf  
    Print "" "'LOaf$X  
    Print "Sample name: " & Chr(9) & sampName Y D1g]p  
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    'Open an output file and write the FRED header data O;.d4pO(tC  
    Dim outFile As String EV;;N  
    outFile = cDir & sampName & "_FRED.txt" 7ipY*DT8  
    Open outFile For Output As #1 ?L.p9o-S0  
    Print #1, "type bsdf_data" [NR0] #h  
    Print #1, "format angles=deg bsdf=value scale=1" *>R/(Q  
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    'Loop the file list, skip the two header lines and write the remaining data to file l%3Q=c  
    Dim lineArray() As String, curLine As Long @5POgQ8  
    For Each curFile In fList ?N9adL &b  
        Print "Merging data from file " & curFile ./z"P]$
 
        ReadFile( cDir & curFile, lineArray ) FZLzu  
        For curLine = 2 To UBound(lineArray) $ET/0v"V  
            Print #1, lineArray(curLine) 3n=cw2FG  
        Next ^!{ oAzy9  
    Next )@};lmPR  
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    'Close the output file YV>VA<
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    Close #1 _16&K}<  
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    Print "Finished merging RPC data for sample " & sampName .,(uoK{  
    Print "FRED formatted data file: " & Chr(9) & outFile kgib$t_7  
End Sub `XRb:d^  
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'Utility function to read the contents of a file into an array of strings. {yl/T:Bh&  
Function ReadFile(ByVal fileName As String, _ :+X2>Lu$FA  
                  ByRef lineArray() As String) As Long +P<w<GfQ  
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    ReadFile = -1 jTxChR  
    Dim oFSO As Object m$G?e9{  
    Set oFSO = CreateObject("Scripting.FileSystemObject") W.7d{ @n  
    Erase lineArray ~N+/ZVo&y  
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    Dim fid As Long uR[PKLh  
    If oFSO.fileexists( fileName ) Then #h|,GvmF<b  
        fid = FreeFile() 71,0v`Z<  
        Open fileName For Input As fid mU0r"\**c3  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) ` TVcI\W  
        Close fid d1LTyzLr  
    End If hghto \G5Y  
    Set oFSO = Nothing w1/T>o  
    Return UBound( lineArray ) 2ucsTh@  
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End Function I@3c QxI  
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Sub GetFileList( ByVal in_dir As String, _ bm]dz;ljh  
                 ByRef in_flist() As String ) hSf#;=9'  
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    'Redimension the file list array I}CA-8  
    Erase in_flist P(gID  
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    'Tracks how many files are found 28L'7  
    Dim fCount As Long 113x9+w[  
    fCount = 0 \(v
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    'Recurse directory and search for text files ;ZW}47:BS6  
    Dim f As String 'V1 -iJj9  
    f = Dir$(in_dir & "*.txt") 7XI4=O};&%  
    While f <> "" .}u(&  
        ReDim Preserve in_flist(fCount) 9/qS*Zdh)  
        in_flist(fCount) = f W1,L>Az^Ts  
        fCount += 1 i1H80m s  
        f = Dir$() IgnY*2FT  
    Wend ^T J  
    ReDim Preserve in_flist(fCount-1) V5^b6$R@  
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End Sub D0_x|a