[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： LJ\uRfs  
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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。 s\@RJ[(<  
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背景： *S%~0=  
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。 Py_yIwQqg  
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。 (kCzz-_\  
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步骤 bys5IOP{]o  
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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。 .FYxVF.  
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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） '1P~"P3  
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 .6C9N{?Tqf  
例如下所示： :O)\+s-  
Sample name:  EDF-C1-56 [/
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Merging data from file EDF-C1-56 0-0.txt n4Xh}KtH  
Finished merging RPC data for sample EDF-C1-56 (r*"}"ZG  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt aNUU' [  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 7C / ^Gw  
a. 创建一个新的散射库  T&'p5h=l  
b. 散射模型命名 vd
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c. 改变散射模型为“Tabulated BSDF”. h8XoF1wuw  
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 ） d%,@,>>)  
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。 H^ds<I<)  
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， &s^t~>Gpr  
g. 点击OK LS:^K  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 .RW&=1D6  
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脚本代码： *q-VY[2  
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'#Language "WWB-COM" .+) AeGh  
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Option Explicit J.(mg D  
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Sub Main %`bn=~T^  
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    'Cleanup Cu!S|Xj.  
    ClearOutputWindow() f = 'AI  
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    Print "Merging RPC Photonics BSDF Data Files" ~KYA{^`*  
    SetTextColor(255,0,0) RF}R~m9]  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." NT=)</v  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." GJ\bZ"vDo  
    SetTextColor(0,0,0) .I Io   
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    'Current directory of this script (should be the same as the text files being merged) U!jRF  
    Dim cDir As String Z|B`n SzH  
    cDir = MacroDir$ & "\" u p zBd]  
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    'Array which will be populated with the list of files to be merged kl|m @Nxp
 
    Dim fList() As String, curFile As String *JOp)e0b  
    GetFileList( cDir, fList ) T"e"?JSRJ  
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    Print "" <9[>+X  
    Print "Files found for merging:" E J&w6),d  
    For Each curFile In fList )`#SMLMy~  
        Print Chr(9) & curFile f3*SIKi  
    Next G[+{[W  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. zUA -  
    Dim nameArray() As String, sampName As String U9XOs)^  
    nameArray = Split(fList(0)," 0-0.txt") **]=!W  
    sampName  = nameArray(0) $'w>doUlA  
    Print "" fM3ZoH/  
    Print "Sample name: " & Chr(9) & sampName ^V"
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    'Open an output file and write the FRED header data km,@y
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    Dim outFile As String |H%,>r`9S  
    outFile = cDir & sampName & "_FRED.txt" _o-01gu.  
    Open outFile For Output As #1 q+)s  
    Print #1, "type bsdf_data" #U6~U6@  
    Print #1, "format angles=deg bsdf=value scale=1" W"g@*B'|  
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    'Loop the file list, skip the two header lines and write the remaining data to file !Xzy
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    Dim lineArray() As String, curLine As Long `8D'r|=`Eh  
    For Each curFile In fList Cp]q>lM"  
        Print "Merging data from file " & curFile Lmc"qFzK  
        ReadFile( cDir & curFile, lineArray ) }^PdW3O*m,  
        For curLine = 2 To UBound(lineArray) N lB%Qu  
            Print #1, lineArray(curLine) 51puR8AG>  
        Next k&o1z'<C  
    Next -l$-\(,M`#  
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    'Close the output file bAL!l\&2  
    Close #1 yV5AVMo  
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    Print "Finished merging RPC data for sample " & sampName WC 5v#*Jd  
    Print "FRED formatted data file: " & Chr(9) & outFile $c24lJ#/  
End Sub ]|/\Sd  
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'Utility function to read the contents of a file into an array of strings. .8Gmy07  
Function ReadFile(ByVal fileName As String, _ oW8 hC  
                  ByRef lineArray() As String) As Long z_en.  
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    ReadFile = -1 A[X~:p.^G  
    Dim oFSO As Object qGKQrb,K  
    Set oFSO = CreateObject("Scripting.FileSystemObject") /,2${$c!  
    Erase lineArray #:M)a?E/%  
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    Dim fid As Long w7X], auRC  
    If oFSO.fileexists( fileName ) Then 7I<];j  
        fid = FreeFile() w(vda0  
        Open fileName For Input As fid -(+/u .  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) gDjs:]/YR  
        Close fid 0YVkq?1x9  
    End If Ga}&%  
    Set oFSO = Nothing 5x; y{qT  
    Return UBound( lineArray ) sz%'=J~!V  
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End Function 0`dMT>&I  
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Sub GetFileList( ByVal in_dir As String, _ G\:^9!nwY~  
                 ByRef in_flist() As String ) , *A',  
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    'Redimension the file list array 7J@D})si  
    Erase in_flist #7~M1/eH=t  
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    'Tracks how many files are found uZ(j"y  
    Dim fCount As Long v"
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    fCount = 0 h[0,/`qb{  
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    'Recurse directory and search for text files er?'o1M  
    Dim f As String 6n.W5 1g(s  
    f = Dir$(in_dir & "*.txt") OyG$ ]C  
    While f <> "" 0=r.I}x  
        ReDim Preserve in_flist(fCount) Ex ?)FL$4  
        in_flist(fCount) = f ddMSiwbY)  
        fCount += 1 ^rc!X]C9  
        f = Dir$() yH8 N8  
    Wend .1.Bf26}d  
    ReDim Preserve in_flist(fCount-1) f-?00*T  
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End Sub #qk A*WP  
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