[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： NypM+y  
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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。 t=o0 #jo  
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背景： A94ZG:  
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。 oa$-o/DhB  
FRED是美国Photon Engineering 公司开发的光学工程仿真软件，其在杂散光分析中独特的算法、高效的准确性，使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 i"Hec9Ri  
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步骤 \fIGMoy!  
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1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下，选择“Raw data”文件。 e\%+~GUTC=  
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2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。（脚本代码放在了本文的最后） /~[+'  
3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 lx$]f)%~  
例如下所示： =NLsT.aa  
Sample name:  EDF-C1-56 huFT_z_;;  
Merging data from file EDF-C1-56 0-0.txt ~sj'GEhEg  
Finished merging RPC data for sample EDF-C1-56 %Z9&zmO  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt <"
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4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 07 [%RG  
a. 创建一个新的散射库 jN 9|q  
b. 散射模型命名 =<Q_&_.60  
c. 改变散射模型为“Tabulated BSDF”. ap;?[B~Ga  
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 ） )@+lfIE(l  
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。 gv)F`uRWA  
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， D#Qfa
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g. 点击OK +c;/hM<IX.  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 fd~a\5%e  
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脚本代码： YuufgPE*H  
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'#Language "WWB-COM" ETU.v*HT]  
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Option Explicit k\->uSU9  
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Sub Main =P'33) \ )  
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    'Cleanup qZw4"&,j$  
    ClearOutputWindow() >d#oJ?goX  
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    Print "Merging RPC Photonics BSDF Data Files" }#0MJ6L  
    SetTextColor(255,0,0) qkQ_#  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." CUJP"u>8M  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." LF o{,%B  
    SetTextColor(0,0,0) )D_ZZPq_  
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    'Current directory of this script (should be the same as the text files being merged) r*$$82s  
    Dim cDir As String ttQX3rmF01  
    cDir = MacroDir$ & "\" MtE18m"z  
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    'Array which will be populated with the list of files to be merged [f`^+,U  
    Dim fList() As String, curFile As String ifA=qn0=}  
    GetFileList( cDir, fList ) ^Ej4^d  
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    Print "" QG{).|pm  
    Print "Files found for merging:" !
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    For Each curFile In fList jC_7cAsl  
        Print Chr(9) & curFile 3Ee8_(E\  
    Next /rMxl(wD'  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. aJh=4j~.  
    Dim nameArray() As String, sampName As String *Nfn6lVB  
    nameArray = Split(fList(0)," 0-0.txt") _PTo!aJL  
    sampName  = nameArray(0) b1X.#p
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    Print "" .-kqt^Gc  
    Print "Sample name: " & Chr(9) & sampName $#Mew:J  
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    'Open an output file and write the FRED header data  $^&SEz  
    Dim outFile As String Znl&.,c)  
    outFile = cDir & sampName & "_FRED.txt" &uLxAw  
    Open outFile For Output As #1 /t
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    Print #1, "type bsdf_data" 6yIl)5/=  
    Print #1, "format angles=deg bsdf=value scale=1" *~p~IX{  
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    'Loop the file list, skip the two header lines and write the remaining data to file ?(8z O"  
    Dim lineArray() As String, curLine As Long >z=_V|^$  
    For Each curFile In fList `i{k^Q  
        Print "Merging data from file " & curFile d<*4)MRN  
        ReadFile( cDir & curFile, lineArray ) ,H{ /@|RW  
        For curLine = 2 To UBound(lineArray) c[=%v]j:u  
            Print #1, lineArray(curLine) Bjg 21bw^  
        Next mtfyhFk  
    Next Sr7+DCr  
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    'Close the output file Oto
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    Close #1 9JF*xXd>Q  
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    Print "Finished merging RPC data for sample " & sampName ] o!#]]  
    Print "FRED formatted data file: " & Chr(9) & outFile wu*WA;FnA  
End Sub 3t(8uG<rL  
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'Utility function to read the contents of a file into an array of strings. eO,  
Function ReadFile(ByVal fileName As String, _ gbc^Lb  
                  ByRef lineArray() As String) As Long ?FRR";  
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    ReadFile = -1 &}Y_EHj}  
    Dim oFSO As Object 7R\!'`]\M  
    Set oFSO = CreateObject("Scripting.FileSystemObject") 1SBc:!2  
    Erase lineArray 9Ao0$|@b  
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    Dim fid As Long fgxsC7P$  
    If oFSO.fileexists( fileName ) Then 0XlX7Sk+  
        fid = FreeFile() ,5\:\e0H  
        Open fileName For Input As fid ;F&wGe  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) ~L(_q]  
        Close fid oH+UuP2a-J  
    End If ?o0#h  
    Set oFSO = Nothing `w Sg/  
    Return UBound( lineArray ) {d$S~  
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End Function 1A23G$D  
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Sub GetFileList( ByVal in_dir As String, _ \Rn.ug  
                 ByRef in_flist() As String ) PF.sM(  
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    'Redimension the file list array ^v3+w"2  
    Erase in_flist ]P0DPea  
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    'Tracks how many files are found /x_C  
    Dim fCount As Long .<Z7
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    fCount = 0 ?xf59mY7  
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    'Recurse directory and search for text files }wR)
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    Dim f As String v\Y;)/!  
    f = Dir$(in_dir & "*.txt") Pi?*rr5WZ  
    While f <> "" =nnS X-x  
        ReDim Preserve in_flist(fCount) 6,G^iv6H  
        in_flist(fCount) = f 7>{edNy!,  
        fCount += 1 OxF\Hm)(  
        f = Dir$() )ymF:]QC  
    Wend eEsEW<su  
    ReDim Preserve in_flist(fCount-1) HkvCQH  
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End Sub if5Y!Tx?G  
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