[技术]RPC Photonics扩散片BSDF [复制链接]

摘要： i$CF
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RPC Photonics公司有高品质的的工程漫射体BSDF测试数据，但它对于FRED帮助甚少，下面这个步骤描述了如何利用FRED脚本转换RPC Photonics提供的TXT文件，并将数据直接应用到FRED的Tabulated scatter 散射模型。 gq~"Z[T  
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背景： \Npvm49  
Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术，可以解决其他技术的不足，大大改善了诸如光刻系统、有效固态照明，显示，背光，显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体（Engineered DiffusersTM）的新概念，与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同，工程漫射体要求对于每个散射中心，通常为微透镜单元，都进行控制。例如全息漫射体可以视为一组随机排列的透镜，但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制：而无法单独操控每个微透镜单元，这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面，在工程漫射体中，每个微透镜单元形成漫射体，由其凹形纵断面和在阵列中的位置所确定。同时，为了确保漫射体不受输入光束变化的影响，并且不产生衍射效果，微透镜单元的分布是随机的，根据产生相应的光束形状函数所选取的概率分布函数来确定。因此，工程漫射体同时保留了随机与确定性漫射体的优点，从而实现高性能的光束整形功能。 T5wVJgN>  
FRED是美国Photon Engineering 公司开发的光学工程仿真软件，其在杂散光分析中独特的算法、高效的准确性，使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 877Kv);  
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步骤 ul!q)cPb{  
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1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下，选择“Raw data”文件。 P[r$KGz  
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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） =Ea,8bpn  
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 R0-Y2v  
例如下所示： kkXe=f%  
Sample name:  EDF-C1-56 {d> 6*b  
Merging data from file EDF-C1-56 0-0.txt Ho $+[K  
Finished merging RPC data for sample EDF-C1-56 nD}<zj$D2  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt LVdtI  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 l
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a. 创建一个新的散射库 EBpg  
b. 散射模型命名 ]hZk#rp}  
c. 改变散射模型为“Tabulated BSDF”. }Ggn2 X  
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 ） Is9.A_0h  
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。 8#HQ05q>  
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， M%s!qC+  
g. 点击OK Z 4c^6v  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 15MKV=?oY  
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脚本代码： qos/pm$
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'#Language "WWB-COM" V(Oi!(H;v  
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Option Explicit [YJ*zO  
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Sub Main EF;B)y=  
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    'Cleanup #;UoZJ B  
    ClearOutputWindow() FA;B:O@:'  
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    Print "Merging RPC Photonics BSDF Data Files" wV,=hMTd&\  
    SetTextColor(255,0,0)  JY_!G  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." MPLeqk$;  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." PmT<S,}L  
    SetTextColor(0,0,0) |C>\ku*  
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    'Current directory of this script (should be the same as the text files being merged) wd
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    Dim cDir As String jRxzZt4  
    cDir = MacroDir$ & "\" <ILi38%Y  
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    'Array which will be populated with the list of files to be merged l I2UpfkBP  
    Dim fList() As String, curFile As String lE3&8~2  
    GetFileList( cDir, fList ) nFwdW@E9  
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    Print "" l s%
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    Print "Files found for merging:" :^]FpUY  
    For Each curFile In fList jI$7vmO  
        Print Chr(9) & curFile N5b&tJbM0  
    Next eGo$F2C6E  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. ZT+{8,  
    Dim nameArray() As String, sampName As String WrR8TYq9D]  
    nameArray = Split(fList(0)," 0-0.txt") >Fc=F#tA9  
    sampName  = nameArray(0) H-8_&E?6m  
    Print "" iu{QHjZK(  
    Print "Sample name: " & Chr(9) & sampName RI BB*  
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    'Open an output file and write the FRED header data lT'V=,Y t  
    Dim outFile As String u3HaWf3  
    outFile = cDir & sampName & "_FRED.txt" $[b1_Db  
    Open outFile For Output As #1 yaAg!mW  
    Print #1, "type bsdf_data" #?~G\Ux0/  
    Print #1, "format angles=deg bsdf=value scale=1" .iST!nh  
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    'Loop the file list, skip the two header lines and write the remaining data to file g5 y*-t  
    Dim lineArray() As String, curLine As Long *k0;R[IAV  
    For Each curFile In fList Wr,pm#gl6  
        Print "Merging data from file " & curFile mHNqzdaa  
        ReadFile( cDir & curFile, lineArray ) =BzBM`
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        For curLine = 2 To UBound(lineArray) +@<@x4yt  
            Print #1, lineArray(curLine) &CfzhIi*!  
        Next &pAmFe  
    Next \G6V-W  
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    'Close the output file _ sBFs.o  
    Close #1 N Q}5'  
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    Print "Finished merging RPC data for sample " & sampName 2F:X:f  
    Print "FRED formatted data file: " & Chr(9) & outFile ShOB"
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End Sub o|V=3y Ok  
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'Utility function to read the contents of a file into an array of strings. {tnhP^C3>  
Function ReadFile(ByVal fileName As String, _ Rtai?  
                  ByRef lineArray() As String) As Long mm N$\2  
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    ReadFile = -1 (-{.T  
    Dim oFSO As Object Qa1G0qMEIF  
    Set oFSO = CreateObject("Scripting.FileSystemObject") x!UGLL]_M  
    Erase lineArray 8+~'T|  
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    Dim fid As Long dV"K
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    If oFSO.fileexists( fileName ) Then {;hRFQ^b  
        fid = FreeFile() K Z0%J5  
        Open fileName For Input As fid 5ma~Pjt8}
 
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) XMpE|M!c  
        Close fid !3o]mBH8  
    End If ~uJO6C6A  
    Set oFSO = Nothing -J++b2R\%  
    Return UBound( lineArray ) 9bD ER  
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End Function @oFuX.  
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Sub GetFileList( ByVal in_dir As String, _ =7zvp,B  
                 ByRef in_flist() As String ) ~93+Oxg  
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    'Redimension the file list array _?9|,  
    Erase in_flist bd`}2vr  
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    'Tracks how many files are found h>n<5{zqM  
    Dim fCount As Long RaB%N$.9s  
    fCount = 0 HuajdC~  
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    'Recurse directory and search for text files 0,m@BsK  
    Dim f As String )H<F([Jri  
    f = Dir$(in_dir & "*.txt")
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    While f <> "" fMZc_dsW9  
        ReDim Preserve in_flist(fCount) AO0aOX8_+D  
        in_flist(fCount) = f ['@R]Si"!  
        fCount += 1 C?PgC~y)  
        f = Dir$() iR4!X()  
    Wend Evq^c5n>{  
    ReDim Preserve in_flist(fCount-1) $:*/^)L  
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End Sub 19^B610