[技术]RPC Photonics扩散片BSDF [复制链接]

摘要： /o|@]SAe.  
"r"Y9KODm  
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。 ny=CtU!z  
1Eg}qU,:  
背景： U Ciq'^,  
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。 .mok.f<G_m  
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。 MH !CzV&  
3Ji,n;QLm  
6eS#L21*  
B1Lnu
B%  
步骤 qbP[ 9  
HvTi^Fb\a  
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。 ,%KB\;1mn'  
'|]zBpz  
%djx0sy  
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） H<NYm#a"  
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 %< W1y  
例如下所示： .Zwn{SMtu  
Sample name:  EDF-C1-56 zZf#E@=$|  
Merging data from file EDF-C1-56 0-0.txt x&9I2"  
Finished merging RPC data for sample EDF-C1-56 ;bA
y7  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt Y^6=_^  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 5X`.2q=d  
a. 创建一个新的散射库 D6ck1pxkx  
b. 散射模型命名 zM@iG]?kc  
c. 改变散射模型为“Tabulated BSDF”. =
} vG|  
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 ） 4uu*&B  
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。 B' :ZX-Q)  
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， hG ]jm  
g. 点击OK -Z;:_"&9  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 W:) M}}&H  
Ko%rB+d  
[j
![R  
脚本代码： aoJ&< vl3  
qy-B
Z%3  
'#Language "WWB-COM" [0~qs|27  
1:&$0jU&U  
Option Explicit :ZzG5[o3  
d9^=
#ot
 
Sub Main G
B !3Z  
buhxC5i%  
    'Cleanup 7P\sn<  
    ClearOutputWindow() {==Q6BG*  
_n_i*p '2  
    Print "Merging RPC Photonics BSDF Data Files" qh&K{r*T  
    SetTextColor(255,0,0) ~cZ1=,
P  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." J`x9XWYw  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." FCP5EN  
    SetTextColor(0,0,0) m#SZI}  
,%jJ ,G,  
    'Current directory of this script (should be the same as the text files being merged) 6XG+YIG6w  
    Dim cDir As String 3{_+dE"9  
    cDir = MacroDir$ & "\" t)m4"p7  
?_^9e  
    'Array which will be populated with the list of files to be merged J`V6zGgW  
    Dim fList() As String, curFile As String V2y[IeSQ  
    GetFileList( cDir, fList ) DMf9wB  
Bo0y"W[+  
    Print "" K{iayg!k  
    Print "Files found for merging:" zeua`j
Q  
    For Each curFile In fList -Kc-eU-&q  
        Print Chr(9) & curFile *o>E{  
    Next h]=chz  
z^b\hR   
    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. FE5R ^W#u-  
    Dim nameArray() As String, sampName As String b,@:eVQ7  
    nameArray = Split(fList(0)," 0-0.txt")  o _CVZ  
    sampName  = nameArray(0) e-s@@k  
    Print "" "ulaF+  
    Print "Sample name: " & Chr(9) & sampName Hc+<(g  
m:^@AR1%d  
    'Open an output file and write the FRED header data IR>Kka(B  
    Dim outFile As String TcIUo!:z  
    outFile = cDir & sampName & "_FRED.txt" _<~05Eh  
    Open outFile For Output As #1 !uZ+r%  
    Print #1, "type bsdf_data"
8jZYy!  
    Print #1, "format angles=deg bsdf=value scale=1" J)-owu;  
Z/I!\  
    'Loop the file list, skip the two header lines and write the remaining data to file U-k;kmaj  
    Dim lineArray() As String, curLine As Long B8nXWi  
    For Each curFile In fList 4R0_%x6vG  
        Print "Merging data from file " & curFile p!691LI  
        ReadFile( cDir & curFile, lineArray ) pQ/:*cd+M  
        For curLine = 2 To UBound(lineArray) ENmo^O#,u  
            Print #1, lineArray(curLine) *[U:'o`67  
        Next nJ?C4\#3  
    Next G]SE A  
PU>;4l  
    'Close the output file m=K XMX  
    Close #1 >}I}9y+  
3}+/\:q*  
    Print "Finished merging RPC data for sample " & sampName H z6H,h  
    Print "FRED formatted data file: " & Chr(9) & outFile jn7}jWA  
End Sub /}VQzF  
i" )_M|   
'Utility function to read the contents of a file into an array of strings. J8%|Gd0#4  
Function ReadFile(ByVal fileName As String, _ nqH^%/7)A@  
                  ByRef lineArray() As String) As Long EW!$D  
Brl6r8LGi  
    ReadFile = -1 5[3hw4  
    Dim oFSO As Object Zu$f[U)X  
    Set oFSO = CreateObject("Scripting.FileSystemObject") Dux`BKl  
    Erase lineArray ]`NbNr]K  
f4_\F/  
    Dim fid As Long ?yz%r`;r  
    If oFSO.fileexists( fileName ) Then 7Y)wu$!7}  
        fid = FreeFile() ceOjuzY  
        Open fileName For Input As fid RpXQi*c0  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) q!,do2T  
        Close fid <r kW4  
    End If </%H'V@  
    Set oFSO = Nothing X+3)DE\2  
    Return UBound( lineArray ) $i1A470C  
lVFX@I=pI  
End Function y((_V%F}  
d5%*
^nMpY  
Sub GetFileList( ByVal in_dir As String, _ /;0>*
ft4  
                 ByRef in_flist() As String ) {aL$vgYT1  
=6dKC_Q  
    'Redimension the file list array <Z;7=k  
    Erase in_flist G225Nz;Y*  
KH7]`CU  
    'Tracks how many files are found |:?.-tq  
    Dim fCount As Long <7rK  
    fCount = 0 GlZ9k-ZRF  
~Qsj)9
 
    'Recurse directory and search for text files lEDHx[q  
    Dim f As String Dmi;# WY  
    f = Dir$(in_dir & "*.txt") %(Ys-GeGr  
    While f <> "" F:g{rm[
  
        ReDim Preserve in_flist(fCount) s`J=:>9*  
        in_flist(fCount) = f &>jkfG  
        fCount += 1 AN>`M?EQ  
        f = Dir$() L1xD$wl  
    Wend CJOl|"UyJ  
    ReDim Preserve in_flist(fCount-1) {XXNl)%  
##@#:B  
End Sub (0Qq rNs