[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： )XQ`M?**M  
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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%Q*k<hw  
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背景： E&yD8=vw  
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。
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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。 _WX#a|4h{  
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步骤 cNzt%MjP  
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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。 UR(-q  
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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） UEak^Mm;=2  
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 )a}"^1  
例如下所示： :hGPTf  
Sample name:  EDF-C1-56 ~-a'v!  
Merging data from file EDF-C1-56 0-0.txt ]0D}T'wM  
Finished merging RPC data for sample EDF-C1-56 3p?KU-  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt xr0haN\p"  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 9*6]&:fm  
a. 创建一个新的散射库 GFSt<k)  
b. 散射模型命名 9>/wUQs!]  
c. 改变散射模型为“Tabulated BSDF”. 1Xy]D  
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 ） sqx`">R  
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。 TG n-7 88  
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， =Cqv=  
g. 点击OK =Nz0.:  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 NGYyn`Lx  
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脚本代码： =1dI>M>tm  
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'#Language "WWB-COM" - ~O'vLG  
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Option Explicit 
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Sub Main 4VN aq<8  
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    'Cleanup dsK&U\ej}  
    ClearOutputWindow() ^GN8V-X4y  
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    Print "Merging RPC Photonics BSDF Data Files" ,1Qd\8N9  
    SetTextColor(255,0,0) %u?HF4S'  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." Fb2%!0i  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." ~;-9X|
 
    SetTextColor(0,0,0) O`FqD{@V  
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    'Current directory of this script (should be the same as the text files being merged) NGjdG=,  
    Dim cDir As String >KGE-Yzj  
    cDir = MacroDir$ & "\" $ &5w\P  
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    'Array which will be populated with the list of files to be merged >=ot8%.!,B  
    Dim fList() As String, curFile As String 5IVks
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    GetFileList( cDir, fList ) t$^l<ppQ  
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    Print "" " oy\_1|  
    Print "Files found for merging:" ~#Md"3  
    For Each curFile In fList @-.? B  
        Print Chr(9) & curFile '(@YK4_M  
    Next x_@i(oQ:_  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. }{7e7tW6  
    Dim nameArray() As String, sampName As String jigs
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    nameArray = Split(fList(0)," 0-0.txt")  ~QG?k  
    sampName  = nameArray(0) k
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    Print "" exR^/|BR  
    Print "Sample name: " & Chr(9) & sampName 2x$x; \*j  
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    'Open an output file and write the FRED header data M\/XP| 7  
    Dim outFile As String D>ai.T%n  
    outFile = cDir & sampName & "_FRED.txt" lpQP"%q  
    Open outFile For Output As #1 ~HLRfL?  
    Print #1, "type bsdf_data" ru.5fQU  
    Print #1, "format angles=deg bsdf=value scale=1" wN]J8Ir  
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    'Loop the file list, skip the two header lines and write the remaining data to file ,-*iCs<  
    Dim lineArray() As String, curLine As Long ayp b  
    For Each curFile In fList ;cP8?U  
        Print "Merging data from file " & curFile irxz l3   
        ReadFile( cDir & curFile, lineArray ) _pDjg%A>n  
        For curLine = 2 To UBound(lineArray) I{.HO<$7D}  
            Print #1, lineArray(curLine) 4-4?IwS  
        Next oC dGQ7G}  
    Next 2JO-0j.  
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    'Close the output file go|>o5!g  
    Close #1 :=g.o;(
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    Print "Finished merging RPC data for sample " & sampName \d68-JS@~  
    Print "FRED formatted data file: " & Chr(9) & outFile /J%do]PDl  
End Sub (}H ,ng'4  
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'Utility function to read the contents of a file into an array of strings. g,
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Function ReadFile(ByVal fileName As String, _ mX_)b>iW  
                  ByRef lineArray() As String) As Long _'iDF  
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    ReadFile = -1 n E:'Zxj  
    Dim oFSO As Object oj.lj!  
    Set oFSO = CreateObject("Scripting.FileSystemObject") @@pq'iRn  
    Erase lineArray XCPb9<L  
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    Dim fid As Long >[K?fJ$+  
    If oFSO.fileexists( fileName ) Then 0<P(M:a  
        fid = FreeFile() P.4E{.)(  
        Open fileName For Input As fid W7e4pR?w  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) Lt<oi8'N  
        Close fid c>MY$-PD  
    End If B3b,F
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    Set oFSO = Nothing nk08>veG  
    Return UBound( lineArray ) i&F~=Q`  
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End Function z[#6-T &  
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Sub GetFileList( ByVal in_dir As String, _ [\HQPo'S  
                 ByRef in_flist() As String ) Y^eX@dEFR  
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    'Redimension the file list array R7K  
    Erase in_flist wixD\t59X  
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    'Tracks how many files are found ]7<m1Lg  
    Dim fCount As Long Sr7@buF  
    fCount = 0 F ?mA1T>x  
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    'Recurse directory and search for text files Qx.jCy@  
    Dim f As String j;0ih_Z@4W  
    f = Dir$(in_dir & "*.txt") F?2FITi_V  
    While f <> "" |0w~P s  
        ReDim Preserve in_flist(fCount) = o+7xom  
        in_flist(fCount) = f \]a uSO  
        fCount += 1 .CmL7 5  
        f = Dir$() S~&\o\"5  
    Wend $~hdm$  
    ReDim Preserve in_flist(fCount-1) fv|%Ocm  
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End Sub rgT%XhUS6f  
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