[技术]RPC Photonics扩散片BSDF [复制链接]

摘要： tgVMgu  
A/c#2  
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。 N*`qsv0  
o}p^q:T*  
背景： ) w1`<7L  
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。 11((b  
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。 }WV}in0
 
! }>CEE  
}|OwUdE!R9  
,gdud[&|;  
步骤 I'E7mb<2  
2;w`W58  
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。 Rz#q68  
[0n[\& 0  
}3}H}  
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） dLfB){>S  
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 Fy$f`w_H@  
例如下所示： |E9'ii&?B  
Sample name:  EDF-C1-56 oMNSQMlI  
Merging data from file EDF-C1-56 0-0.txt [Qqomm.[\w  
Finished merging RPC data for sample EDF-C1-56 g.*DlD%%  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt Nl'@Y^8N  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 we/sv9v}n  
a. 创建一个新的散射库 .|e8v _2J  
b. 散射模型命名 =z!^OT6eb  
c. 改变散射模型为“Tabulated BSDF”. .%EYof  
d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） B#G:aBCM  
e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 #\8"d  
f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， VTa%  
g. 点击OK 2e9.U/9  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 +# 3e<+!F  
al"=ld(  
ph$vP;}  
脚本代码： FuM:~jv  
;pw9+zo^M  
'#Language "WWB-COM" L|L;<  
G*f\ /  
Option Explicit 5P{[8PZxbV  
s o1hC  
Sub Main 
5ZX  
v5F+@ug  
    'Cleanup tZG l^mA"g  
    ClearOutputWindow() MD^,"!A  
U=WS]  
    Print "Merging RPC Photonics BSDF Data Files" PJYUD5  
    SetTextColor(255,0,0) "~mY4WVG  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." .I?~R:(Ig  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." M1icj~Jr  
    SetTextColor(0,0,0) =4$ErwI_dm  
4T-"\tmg/  
    'Current directory of this script (should be the same as the text files being merged) c'>_JlG~  
    Dim cDir As String DL<;qhte  
    cDir = MacroDir$ & "\" )$h!lAo  
JOz4O  
    'Array which will be populated with the list of files to be merged =I aWf  
    Dim fList() As String, curFile As String la}cGZ; p.  
    GetFileList( cDir, fList ) +n<W#O%  
2qot(Zs1i  
    Print "" 3RanAT.nu:  
    Print "Files found for merging:"  wX5q=I  
    For Each curFile In fList Z5p [*LMO  
        Print Chr(9) & curFile fDloL  
    Next -p?&vQDo`  
l/,la]!T  
    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. K9-9 c"cz  
    Dim nameArray() As String, sampName As String p|(SR~;6  
    nameArray = Split(fList(0)," 0-0.txt") _RIlGs\.  
    sampName  = nameArray(0) SK#&%Yk  
    Print "" }i{qRx"4  
    Print "Sample name: " & Chr(9) & sampName zn>+
\  
ZS%W/.?  
    'Open an output file and write the FRED header data Q:|W/RD~  
    Dim outFile As String z)(W x">  
    outFile = cDir & sampName & "_FRED.txt" IJ~j(.W  
    Open outFile For Output As #1 e=l:!E10  
    Print #1, "type bsdf_data" +TyN;e  
    Print #1, "format angles=deg bsdf=value scale=1" KIcIYCBz  
BN `2UVH  
    'Loop the file list, skip the two header lines and write the remaining data to file ;*$e8y2  
    Dim lineArray() As String, curLine As Long T9I$6HAi  
    For Each curFile In fList S43J
aSw)  
        Print "Merging data from file " & curFile B]H8^   
        ReadFile( cDir & curFile, lineArray ) WQ}wQ:]  
        For curLine = 2 To UBound(lineArray) $4^SWT.  
            Print #1, lineArray(curLine) @gfW*PNjlP  
        Next d!UxFY@  
    Next qDG2rFu&[  
Gx8
!AmeX  
    'Close the output file _-lE$
O  
    Close #1 b*.aaOb  
n0!2-Q5U)h  
    Print "Finished merging RPC data for sample " & sampName 3C<G8*4);/  
    Print "FRED formatted data file: " & Chr(9) & outFile i%JJ+9N  
End Sub 2Kf/Id1  
K2yu}F^}  
'Utility function to read the contents of a file into an array of strings. p
20JUzy  
Function ReadFile(ByVal fileName As String, _ 2QRO$NieV  
                  ByRef lineArray() As String) As Long |?#JCG  
e`S\-t?Z  
    ReadFile = -1 [gpO?'~  
    Dim oFSO As Object +C8O"  
    Set oFSO = CreateObject("Scripting.FileSystemObject") Eamt_/LKf  
    Erase lineArray Z[OX{_2]K  
9OV@z6
  
    Dim fid As Long |$b8(g$s)  
    If oFSO.fileexists( fileName ) Then F_(~b  
        fid = FreeFile() 0U@#&pUc  
        Open fileName For Input As fid !8[T*'LJ-  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) 2 4+  
        Close fid W~0rSVD$<z  
    End If K^U=
"  
    Set oFSO = Nothing B=r DU$z  
    Return UBound( lineArray ) aTTkj\4  
9zb1t1[W  
End Function xy]O8>b  
>]pZ;e$  
Sub GetFileList( ByVal in_dir As String, _ mpug#i6q  
                 ByRef in_flist() As String ) gDVsi  
t\hnnu`Pq  
    'Redimension the file list array Wu^Rv-xA  
    Erase in_flist ?UAuUFueA  
&F uPd}F  
    'Tracks how many files are found aL4^ po  
    Dim fCount As Long D9[19,2r`  
    fCount = 0 >jsY'Bm  
{#qUZ z-  
    'Recurse directory and search for text files [M[<'+^*  
    Dim f As String ()IZ7#kL?  
    f = Dir$(in_dir & "*.txt") -0d9,,c  
    While f <> "" v?O
VhV  
        ReDim Preserve in_flist(fCount) p
E&G]ZC  
        in_flist(fCount) = f qC> tni%  
        fCount += 1 Ohk\P;}  
        f = Dir$() ?"mZb#%  
    Wend J)>DsQ+Cj  
    ReDim Preserve in_flist(fCount-1) B=TUZ)  
KU,SAcfR7  
End Sub a]u.Uqyx2w