[技术]RPC Photonics扩散片BSDF [复制链接]

摘要： eF%>5  
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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。
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背景： nQ5N\RAZ  
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。 X]T&kdQ6q  
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。 fp`k1Uq@  
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步骤 xb22:  
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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。 cq#=Vb  
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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） 8uD%  
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 u#^~([I  
例如下所示： qQ T^d  
Sample name:  EDF-C1-56 Fd(o8z8Q  
Merging data from file EDF-C1-56 0-0.txt 8`GN8F  
Finished merging RPC data for sample EDF-C1-56 "
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FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt IL&;2%  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 E$1P H)  
a. 创建一个新的散射库 31)eDs  
b. 散射模型命名 ?Fp2W+M j  
c. 改变散射模型为“Tabulated BSDF”. z1vSt[s  
d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） kmZ  U;Z  
e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 EWNm }C9  
f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， WTX!)H6Zv  
g. 点击OK Y0Bd[  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 *:tfz*FG$G  
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脚本代码： \{K~x@`  
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'#Language "WWB-COM" oa q!<lI  
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Option Explicit l1uv]t <  
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Sub Main kBr?Q  
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    'Cleanup +txHj(Y`  
    ClearOutputWindow() ]rMHO  
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    Print "Merging RPC Photonics BSDF Data Files" %RD%AliO}K  
    SetTextColor(255,0,0) ^w6~?'}  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." + )lkHv$R  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." )gPkL r  
    SetTextColor(0,0,0) 3`U^sr:[%  
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    'Current directory of this script (should be the same as the text files being merged) s_RUb  
    Dim cDir As String \VAm4   
    cDir = MacroDir$ & "\" |:)ARH6l#  
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    'Array which will be populated with the list of files to be merged *h4x`luJ  
    Dim fList() As String, curFile As String ''3b[<  
    GetFileList( cDir, fList ) d*tn&d~k,  
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    Print "" Q8?:L<
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    Print "Files found for merging:" Uxb>)36I  
    For Each curFile In fList ['JIMcD  
        Print Chr(9) & curFile |Q*OA  
    Next * G0I2  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. @0&KM|+  
    Dim nameArray() As String, sampName As String 0*F<tg,+]  
    nameArray = Split(fList(0)," 0-0.txt") .F^372hH3  
    sampName  = nameArray(0) SEXmVFsQ
 
    Print "" /?_5!3KJ  
    Print "Sample name: " & Chr(9) & sampName -v &  
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    'Open an output file and write the FRED header data 4B$|UG  
    Dim outFile As String sMNhD/bb  
    outFile = cDir & sampName & "_FRED.txt" 1T/ 72+R0  
    Open outFile For Output As #1 klxNGxWAX  
    Print #1, "type bsdf_data" hyVBQhk  
    Print #1, "format angles=deg bsdf=value scale=1"
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    'Loop the file list, skip the two header lines and write the remaining data to file 2e|m3  
    Dim lineArray() As String, curLine As Long AEE&{_[S  
    For Each curFile In fList +XoY@|Djd  
        Print "Merging data from file " & curFile TS49{^d$  
        ReadFile( cDir & curFile, lineArray ) )=5
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        For curLine = 2 To UBound(lineArray) =)IV^6~b  
            Print #1, lineArray(curLine) H-/w8_} KG  
        Next R}T\<6Y  
    Next lqZUU92;  
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    'Close the output file R@A"U[*  
    Close #1 i(an]%'v  
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    Print "Finished merging RPC data for sample " & sampName A?4s+A@Eg  
    Print "FRED formatted data file: " & Chr(9) & outFile v
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End Sub vTq [Xe"  
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'Utility function to read the contents of a file into an array of strings. y1_z(L;I  
Function ReadFile(ByVal fileName As String, _ Bh5z4  
                  ByRef lineArray() As String) As Long f <pJ_  
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    ReadFile = -1 +V9<ug6T  
    Dim oFSO As Object G^2%F5@  
    Set oFSO = CreateObject("Scripting.FileSystemObject") "a=dx| Z  
    Erase lineArray LtVIvZie  
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    Dim fid As Long xV>sc;PEb  
    If oFSO.fileexists( fileName ) Then xM2UwTpW  
        fid = FreeFile() QQ\\:]iM  
        Open fileName For Input As fid UoOxGo  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) }II)<g'  
        Close fid BXa.XZ<n(  
    End If 8[L]w^  
    Set oFSO = Nothing Tu&W7aoX5  
    Return UBound( lineArray ) 0P^&{ek+)  
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End Function d]+2rt}]hL  
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Sub GetFileList( ByVal in_dir As String, _ i<-a-Z+^  
                 ByRef in_flist() As String ) Wo7`gf_(  
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    'Redimension the file list array G0b##-.'^  
    Erase in_flist k~IRds@G  
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    'Tracks how many files are found DSL3+%KF#  
    Dim fCount As Long k\Z@B!VAq  
    fCount = 0 +6Ye'IOG  
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    'Recurse directory and search for text files 4GG0jCNk  
    Dim f As String ]/{iIS_  
    f = Dir$(in_dir & "*.txt") _WN\9<  
    While f <> "" Y{g[LG`U  
        ReDim Preserve in_flist(fCount) }S 6h1X  
        in_flist(fCount) = f _|wnmeL*  
        fCount += 1 L!0}&i;u~5  
        f = Dir$() ("P]bU+'>  
    Wend 7=a=@D[  
    ReDim Preserve in_flist(fCount-1) y1#*c$ O  
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End Sub ?yKG\tPhM