[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： 9c1q:>|  
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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。 8 ?:W{GAo  
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背景： ;;U&mhz`  
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。 ~EYdEqS)  
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。 rfZg  
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步骤 G`;mSq6i  
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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。 &;GoCU Le  
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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） gK dNgU  
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 HDu|KW$o1  
例如下所示： 6e}T zc\@(  
Sample name:  EDF-C1-56 <!|=_W6  
Merging data from file EDF-C1-56 0-0.txt L9whgXD  
Finished merging RPC data for sample EDF-C1-56 l|9'l[}&  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt _F8-4  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 Rob:
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a. 创建一个新的散射库 :X*uE^bH  
b. 散射模型命名 _qQo}|/q  
c. 改变散射模型为“Tabulated BSDF”. bs?4|#[K  
d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） otP2qAI  
e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 /`O'eH  
f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， j{zVVT  
g. 点击OK Vr&v:8:wb  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 =)]RD%Oq  
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脚本代码： xz,M>Ua  
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'#Language "WWB-COM" 0XL[4[LdA  
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Option Explicit ,l\D@<F  
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Sub Main Z \-  
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    'Cleanup #P1;*m  
    ClearOutputWindow() fAvB!e  
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    Print "Merging RPC Photonics BSDF Data Files" &0-Pl.M  
    SetTextColor(255,0,0) e9B$"_ &2  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." :!,.c$M  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." Aq/wa6^%  
    SetTextColor(0,0,0) -%t8a42  
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    'Current directory of this script (should be the same as the text files being merged) \<y#$:4r<8  
    Dim cDir As String [3W+h1  
    cDir = MacroDir$ & "\" Mz6|#P}.s  
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    'Array which will be populated with the list of files to be merged jH4Wu`r;m  
    Dim fList() As String, curFile As String Szlww  
    GetFileList( cDir, fList ) )v.\4Q4  
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    Print "" It^_?oiK  
    Print "Files found for merging:" P`M1sON~  
    For Each curFile In fList [dXRord  
        Print Chr(9) & curFile 'zTa]y]a  
    Next z.kBQ{P  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. vYG
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    Dim nameArray() As String, sampName As String \G1(r=fU  
    nameArray = Split(fList(0)," 0-0.txt") *Kw/ilI  
    sampName  = nameArray(0) !E\J`K0_e  
    Print "" Xc]Q_70O  
    Print "Sample name: " & Chr(9) & sampName HM\gO
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    'Open an output file and write the FRED header data =TXc- J  
    Dim outFile As String T}A{Xu*:+H  
    outFile = cDir & sampName & "_FRED.txt" )$I"LyK)  
    Open outFile For Output As #1 HC ?XNR&  
    Print #1, "type bsdf_data" Z?'){\$*  
    Print #1, "format angles=deg bsdf=value scale=1" 2VS#=i(B^  
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    'Loop the file list, skip the two header lines and write the remaining data to file /?QBMI  
    Dim lineArray() As String, curLine As Long 4:v{\R  
    For Each curFile In fList <i1P~  
        Print "Merging data from file " & curFile MT@Uu  
        ReadFile( cDir & curFile, lineArray ) YcBAW4B`  
        For curLine = 2 To UBound(lineArray) r.zJ/T
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            Print #1, lineArray(curLine) %|3UWN  
        Next mdHC{sp  
    Next n?A;'\cK  
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    'Close the output file rk(0w|zR+  
    Close #1 o>Z+=&BZ@a  
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    Print "Finished merging RPC data for sample " & sampName ^zaN?0%S33  
    Print "FRED formatted data file: " & Chr(9) & outFile bDPT1A`F  
End Sub 1YMu\(  
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'Utility function to read the contents of a file into an array of strings. O8ZHI
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Function ReadFile(ByVal fileName As String, _ !b+Kasss9  
                  ByRef lineArray() As String) As Long yf6&'Y{  
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    ReadFile = -1 ~UJ_Rr54  
    Dim oFSO As Object [HENk34  
    Set oFSO = CreateObject("Scripting.FileSystemObject") c8jq.y v  
    Erase lineArray Au/n|15->C  
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    Dim fid As Long D}Lx9cL  
    If oFSO.fileexists( fileName ) Then ZK]C!8\2|  
        fid = FreeFile() C zvi'
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        Open fileName For Input As fid "GofQ5,|  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) 2xd G&}$fa  
        Close fid $Mp#tH28  
    End If 1jozM"H7Q  
    Set oFSO = Nothing z7J2O  
    Return UBound( lineArray ) 5<ycF_  
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End Function I(Yyg,1Z  
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Sub GetFileList( ByVal in_dir As String, _ Kq;
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                 ByRef in_flist() As String ) &u_f:Pog  
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    'Redimension the file list array iB5Se  
    Erase in_flist UpS`KgF"v  
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    'Tracks how many files are found Ui7S8c#tH  
    Dim fCount As Long 7m=tu?@  
    fCount = 0 xAD:Z"  
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    'Recurse directory and search for text files d1#;>MiU  
    Dim f As String ;,]T|>M  
    f = Dir$(in_dir & "*.txt") sD*8:Hl  
    While f <> "" igsJa1F  
        ReDim Preserve in_flist(fCount) :- ydsR/  
        in_flist(fCount) = f \qqt/  
        fCount += 1 x,z+l-y  
        f = Dir$() yA!#>u%g  
    Wend }CA oB::&  
    ReDim Preserve in_flist(fCount-1) *#,wV  
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End Sub Nd*zSsVlq  
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