[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： `N'V#)Pi  
(%'9CfPx  
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。 .3X Y&6  
]iVLHVqz  
背景： '!Wvqs  
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。 ` >U?v  
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。 [E|uY]DR  
tJ'iX>9I  
a <wL#Id  
?\y%]1  
步骤 [_.n$p-  
9]7u_  
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。 D(\$i.,b2  
!%[S49s  
gKi{Y1
 
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） i=rH7k  
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 [Y/:@t"2y  
例如下所示：  3+U]?7t  
Sample name:  EDF-C1-56 #{PmNx%M  
Merging data from file EDF-C1-56 0-0.txt E!mmLVa9  
Finished merging RPC data for sample EDF-C1-56 ej^3YNh&  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt Q2QY* A  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 Gu;OVLR|  
a. 创建一个新的散射库 7lA:)a_!]  
b. 散射模型命名 v~=\H  
c. 改变散射模型为“Tabulated BSDF”. r,NgG!zq<  
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 ） /.Q4~Hw%}  
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。 G%{0i20_  
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$q'FZH  
g. 点击OK ~ap2m  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 4 b,N8  
93o;n1
rS  
lr3mE  
脚本代码： kbI/4IRW  
C5X(U:  
'#Language "WWB-COM" c$h9/H=
~  
@PSL
s*  
Option Explicit VW<0Lt3  
\?lz&<  
Sub Main ^?GmrHC)  
7o]HQ[xO  
    'Cleanup 1cC1*c0Z  
    ClearOutputWindow() z&}-8JykH  
^%<pJMgdF  
    Print "Merging RPC Photonics BSDF Data Files" {C3Y7<  
    SetTextColor(255,0,0) g0R[xOS|  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." 8dO?K*J,H'  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." m_7 nz!h  
    SetTextColor(0,0,0) 3z8
C  
o\=n4;S  
    'Current directory of this script (should be the same as the text files being merged) 5V5w:U>_z  
    Dim cDir As String Zv!{{XO2;  
    cDir = MacroDir$ & "\" *hY2.t; X  
h~}.G{"  
    'Array which will be populated with the list of files to be merged "484n/D  
    Dim fList() As String, curFile As String N4!<Xj  
    GetFileList( cDir, fList ) 7E7dSq  
l67Jl"v  
    Print "" v~)LO2y   
    Print "Files found for merging:" e2)autBe  
    For Each curFile In fList !0}\&<8/m  
        Print Chr(9) & curFile <48<86TP  
    Next 0L-!! c3  
k$i'v:c|:i  
    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. l=m(mf?QBg  
    Dim nameArray() As String, sampName As String MuI2?:~:*4  
    nameArray = Split(fList(0)," 0-0.txt") RHY4P4B<v>  
    sampName  = nameArray(0) xge7r3i  
    Print "" SNpi=K!yn  
    Print "Sample name: " & Chr(9) & sampName 8Ogv9  
=;L*<I  
    'Open an output file and write the FRED header data kxB.,'  
    Dim outFile As String 5Av=3[kh"%  
    outFile = cDir & sampName & "_FRED.txt" BlC<`2S  
    Open outFile For Output As #1 7jG(<!,  
    Print #1, "type bsdf_data" |oFAGP1  
    Print #1, "format angles=deg bsdf=value scale=1" AC- )BM';  
LHYLC>J  
    'Loop the file list, skip the two header lines and write the remaining data to file c-4STPNQi  
    Dim lineArray() As String, curLine As Long 4=<*Vd`p  
    For Each curFile In fList 3
iNkoBCg  
        Print "Merging data from file " & curFile Xyx"A(v^l  
        ReadFile( cDir & curFile, lineArray ) l.=p8-/$'7  
        For curLine = 2 To UBound(lineArray) K\?]$dK5  
            Print #1, lineArray(curLine) A#y@`}]!'  
        Next lCT{v@pp  
    Next e":G*2a  
8Cx^0  
    'Close the output file /n,a?Ft^N)  
    Close #1 t0E51Ic@  
x!<yT?A  
    Print "Finished merging RPC data for sample " & sampName zw@'vncc  
    Print "FRED formatted data file: " & Chr(9) & outFile EG<s_d?  
End Sub @x&P9M0g  
X` YwP/D  
'Utility function to read the contents of a file into an array of strings. 8{ c!).  
Function ReadFile(ByVal fileName As String, _ HLK@xKD<  
                  ByRef lineArray() As String) As Long Sm{>rR  
t#E}NR  
    ReadFile = -1 fxQN+6;  
    Dim oFSO As Object # TkR  
    Set oFSO = CreateObject("Scripting.FileSystemObject") A<MtKb  
    Erase lineArray Hf gz02Z$  
tln37vq  
    Dim fid As Long 2tQ`/!m>v$  
    If oFSO.fileexists( fileName ) Then Jf;?XP]z  
        fid = FreeFile() R W/z1  
        Open fileName For Input As fid <yUstz,Xu^  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) :$3oFN*g  
        Close fid ~aK?cP  
    End If [\z/Lbn ,.  
    Set oFSO = Nothing e /K#>,  
    Return UBound( lineArray ) 6QQfQ,  
2'0K WYM  
End Function NZLAk~R;0  
kSncZ0K{  
Sub GetFileList( ByVal in_dir As String, _ R!\EKH  
                 ByRef in_flist() As String ) \_6OCVil  
+>f<EPGn  
    'Redimension the file list array HfNDD|Zz  
    Erase in_flist #\rwLpC1u  
f:
JlZ&  
    'Tracks how many files are found /B3R1kNf|  
    Dim fCount As Long \E1U@6a  
    fCount = 0 je,}_:7  
%q3$|>  
    'Recurse directory and search for text files +C]&2zc.  
    Dim f As String Av J4\  
    f = Dir$(in_dir & "*.txt") r),PtI0X  
    While f <> "" uq3{hB#  
        ReDim Preserve in_flist(fCount) 7*o*6,/  
        in_flist(fCount) = f &]6)
LFm  
        fCount += 1 {}~:&.D  
        f = Dir$() o89( h!  
    Wend tA.`k;LT  
    ReDim Preserve in_flist(fCount-1) :*514N  
I<oL}f  
End Sub ~EiH-z4U  
7j<e)"  
eU+ {*YJg  
QQ：2987619807 f>jwN@(