[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： {(F}SF{  
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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。 .9g :-hv  
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背景： &pz`gn
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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。 eDNY|}$}v  
FRED是美国Photon Engineering 公司开发的光学工程仿真软件，其在杂散光分析中独特的算法、高效的准确性，使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。  k6@  
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步骤 QP!;Gwqr  
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1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下，选择“Raw data”文件。 m%"=sX
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2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。（脚本代码放在了本文的最后） g}9heR  
3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 SjJ$Oinc  
例如下所示： F60m]NUM)c  
Sample name:  EDF-C1-56 0CX9tr2J  
Merging data from file EDF-C1-56 0-0.txt l 8GAZ*+  
Finished merging RPC data for sample EDF-C1-56 c1*^ \  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt 7Ot&]M
 
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 PqyR,Bcx0  
a. 创建一个新的散射库 Xfg?\j/  
b. 散射模型命名 D`B*+  
c. 改变散射模型为“Tabulated BSDF”. Ln\Gv/)  
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 ） a~-k} G5  
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。 ?&U~X)Q  
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， R \y qM;2  
g. 点击OK dOgc%(kz  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 Yc5) ^v  
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脚本代码： w0<1=;_%  
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'#Language "WWB-COM" }1sd<<\`  
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Option Explicit HGj[\
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Sub Main "88<{xL  
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    'Cleanup b|@f!lA  
    ClearOutputWindow() $KGRpI  
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    Print "Merging RPC Photonics BSDF Data Files" 10_@'N  
    SetTextColor(255,0,0)  /zir$  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." c+1<3)Q<  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." %IUTi6P l  
    SetTextColor(0,0,0) GN|xd+O_  
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    'Current directory of this script (should be the same as the text files being merged) dFnu&u"  
    Dim cDir As String ;,B $lgF  
    cDir = MacroDir$ & "\" vFgnbWxG  
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    'Array which will be populated with the list of files to be merged U owbk:  
    Dim fList() As String, curFile As String XJ7mvLM;  
    GetFileList( cDir, fList ) I
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    Print "" ;@[ax{ J  
    Print "Files found for merging:" N#X(gEV  
    For Each curFile In fList %#lJn.o  
        Print Chr(9) & curFile \e?w8R.6w^  
    Next QUc&f+~  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. k3e?:t 9  
    Dim nameArray() As String, sampName As String TaTw,K|/  
    nameArray = Split(fList(0)," 0-0.txt") 5jcy*G}[  
    sampName  = nameArray(0) `g(r.`t^  
    Print "" $-mwr,i  
    Print "Sample name: " & Chr(9) & sampName qI1JM =  
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    'Open an output file and write the FRED header data L'x[wM0w;  
    Dim outFile As String <%LN3T  
    outFile = cDir & sampName & "_FRED.txt" gG,gL9o  
    Open outFile For Output As #1 m'L8z fX  
    Print #1, "type bsdf_data" SA-r61  
    Print #1, "format angles=deg bsdf=value scale=1" =>)4>WT8A  
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    'Loop the file list, skip the two header lines and write the remaining data to file e?XQ,  
    Dim lineArray() As String, curLine As Long Lq5Eu$;r  
    For Each curFile In fList C;eM:v0A[  
        Print "Merging data from file " & curFile o~p%ODH  
        ReadFile( cDir & curFile, lineArray ) 1\if XJ  
        For curLine = 2 To UBound(lineArray) "]1|%j  
            Print #1, lineArray(curLine) VrZ6m  
        Next 7?~*F7F  
    Next w 8oIq*  
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    'Close the output file 9]*hP](  
    Close #1 Zd[6-/-:  
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    Print "Finished merging RPC data for sample " & sampName aEC&#Q(]q  
    Print "FRED formatted data file: " & Chr(9) & outFile )R9QJSe  
End Sub c *]6>50  
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'Utility function to read the contents of a file into an array of strings. "_36WX  
Function ReadFile(ByVal fileName As String, _ p#fV|2'  
                  ByRef lineArray() As String) As Long sRf?JyB  
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    ReadFile = -1 #~@Cl9[)D  
    Dim oFSO As Object ~;B@ {kFY)  
    Set oFSO = CreateObject("Scripting.FileSystemObject") $tFmp)  
    Erase lineArray lG!W
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    Dim fid As Long VT`C<'   
    If oFSO.fileexists( fileName ) Then *
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        fid = FreeFile() dQH9NsV7g  
        Open fileName For Input As fid XCU>b[Cj,  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) ^
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        Close fid bpWEF b'f  
    End If k_%"#  
    Set oFSO = Nothing C*1,aLSw  
    Return UBound( lineArray ) VsMTzGr  
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End Function 2K&5Kt/  
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Sub GetFileList( ByVal in_dir As String, _ )]a{cczL"  
                 ByRef in_flist() As String ) @ wJ|vW_.  
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    'Redimension the file list array '-5Q>d~&h  
    Erase in_flist %N }0,a0  
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    'Tracks how many files are found )=c/{  
    Dim fCount As Long f)/5%W7n}  
    fCount = 0
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    'Recurse directory and search for text files EvEI5/z  
    Dim f As String wnoL<p  
    f = Dir$(in_dir & "*.txt") vfZ.js/  
    While f <> "" AUvUk<a  
        ReDim Preserve in_flist(fCount) h1`u-tc2x  
        in_flist(fCount) = f \9}RAr#2]N  
        fCount += 1 mUW4d3tE  
        f = Dir$() %uWq)D4r  
    Wend eL7\})!W  
    ReDim Preserve in_flist(fCount-1) */JMPw&  
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End Sub #.kDin~!  
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