[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： v!WkPvU  
s2kom)  
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。 NK!#K>AO  
Ha41Wn'tZ  
背景： `:*O8h~i^8  
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。 ;!:@3c  
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。 0 zn }l6OS  
8#h~J>u.  
\Y$@$)   
i5;_  
步骤 CFW#+U#U  
g;-6Hg'  
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。 qA>C<NL  
\N
a  
*-,jIaL;  
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） lU8X{SV!  
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 FCIA8^}s  
例如下所示： njGZ#{"eC  
Sample name:  EDF-C1-56 L)QAI5o:3  
Merging data from file EDF-C1-56 0-0.txt LB\+*P6QM  
Finished merging RPC data for sample EDF-C1-56 AYHefAF<w  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt q Oyo+hu  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 Wagb|B\  
a. 创建一个新的散射库 Mh"vH0\Lj  
b. 散射模型命名 )\m%&EXG{  
c. 改变散射模型为“Tabulated BSDF”. bFB.hkTP  
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 ） YF$nL(  
e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 j}aU*p~N  
f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， \H{UJ  
g. 点击OK #
McX  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 X*< !_3  
Lgrpy  
7OdJ&Gzd  
脚本代码： B#, TdP]/  
*T-v^ndJh  
'#Language "WWB-COM" p"|0PlW  
/L; c -^  
Option Explicit w\%AR1,rs  
M d.^r5r  
Sub Main %'&_Po
\  
J|@kF!6  
    'Cleanup +z O.|`+  
    ClearOutputWindow() V
7)<
MY  
%ou
@Y`  
    Print "Merging RPC Photonics BSDF Data Files" ppR;v  
    SetTextColor(255,0,0) LB/1To  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." ?XnKKw\  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." RCY}JH>}  
    SetTextColor(0,0,0) 19*
D*dkBR  
k~=W1R%  
    'Current directory of this script (should be the same as the text files being merged) i/j eb*d0  
    Dim cDir As String 6g 5Lf)yG  
    cDir = MacroDir$ & "\" eeCrH
t4;  
c^8csQ fG  
    'Array which will be populated with the list of files to be merged :$^cY>o  
    Dim fList() As String, curFile As String CH] +S>$  
    GetFileList( cDir, fList ) 2yPF'Q7u_.  
SGUZ'}  
    Print "" LDYk\[81  
    Print "Files found for merging:" =@s{H +  
    For Each curFile In fList IP+.L]S  
        Print Chr(9) & curFile Z3N^)j8  
    Next ;6tGRh$b  
|`Q2K9'4bL  
    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. I`S?2i2H  
    Dim nameArray() As String, sampName As String ,A;wLI  
    nameArray = Split(fList(0)," 0-0.txt") [_1K1i"m  
    sampName  = nameArray(0) Z>_F
:1x
 
    Print "" eK =v<X  
    Print "Sample name: " & Chr(9) & sampName ;{Tf:j'g  
nD}CQ_C  
    'Open an output file and write the FRED header data lJ(];/%  
    Dim outFile As String 2<TpNGXM_  
    outFile = cDir & sampName & "_FRED.txt" `8b4P>';O'  
    Open outFile For Output As #1 p{w:^l(  
    Print #1, "type bsdf_data" nrJW.F]S8[  
    Print #1, "format angles=deg bsdf=value scale=1" 9e0t  
#iAw/a0&  
    'Loop the file list, skip the two header lines and write the remaining data to file :0vKt 6>Sp  
    Dim lineArray() As String, curLine As Long F+285JK  
    For Each curFile In fList _g%h:G&^  
        Print "Merging data from file " & curFile r@ v&~pL  
        ReadFile( cDir & curFile, lineArray ) w~Jy,[@n  
        For curLine = 2 To UBound(lineArray) qq
r]S^WW  
            Print #1, lineArray(curLine) KpfQ=~'  
        Next sO0j!;N  
    Next 04@?Jb1*  
cOb,Md  
    'Close the output file 905Lk>rB  
    Close #1 >/9on.  
Ht&%`\9s  
    Print "Finished merging RPC data for sample " & sampName :za:gs0  
    Print "FRED formatted data file: " & Chr(9) & outFile ;]Ko7M(4  
End Sub 9 $Ud\
 
(laVmU?I7  
'Utility function to read the contents of a file into an array of strings. \>)#cEX5  
Function ReadFile(ByVal fileName As String, _ `l}+BI`4  
                  ByRef lineArray() As String) As Long {7d\du&G  
(x/xqDpmBS  
    ReadFile = -1 /tu\q  
    Dim oFSO As Object cnR18NK  
    Set oFSO = CreateObject("Scripting.FileSystemObject") lJdwbuB6  
    Erase lineArray ^8{:RiN6e~  
;Ff5oo
L{  
    Dim fid As Long qTrb)95  
    If oFSO.fileexists( fileName ) Then -"/l)1ox,  
        fid = FreeFile() qExmf%q:q  
        Open fileName For Input As fid `Uy4>?  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) DH'0#  
        Close fid '<%;Nv  
    End If 7cly{U"  
    Set oFSO = Nothing `m=u2kxY  
    Return UBound( lineArray ) /4Jm]"  
X$9 "dL  
End Function H@V+Q}  
Rd>PE=u  
Sub GetFileList( ByVal in_dir As String, _ ibv.M=  
                 ByRef in_flist() As String ) ILMXWw  
 d>}R3T  
    'Redimension the file list array %TS8 9/  
    Erase in_flist K&UTs$_cI  
mH5[(?  
    'Tracks how many files are found @Xl/<S&  
    Dim fCount As Long B'~CFj0W%=  
    fCount = 0 ?b3({P  
}TsND6Ws3  
    'Recurse directory and search for text files X'.*I])  
    Dim f As String AlhPT (  
    f = Dir$(in_dir & "*.txt") 2pV@CT  
    While f <> "" `;v>fTcy  
        ReDim Preserve in_flist(fCount) DY?;Z98P?  
        in_flist(fCount) = f hp!. P1b  
        fCount += 1 -|YDKcL  
        f = Dir$() ;ep@ )Y  
    Wend y)0wM~E;2  
    ReDim Preserve in_flist(fCount-1) g"|Z1iy|9  
Oj0,Urs7  
End Sub !1fAW!
8  
CT#u+]T  
jb0LMl}/A  
QQ：2987619807 JmJNq$2#c