[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： aot2F60J,  
H8dS]N~[Y  
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。 W(4$.uZ)  
5/h-Hr  
背景： G{>PYLxOb  
Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术，可以解决其他技术的不足，大大改善了诸如光刻系统、有效固态照明，显示，背光，显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体（Engineered DiffusersTM）的新概念，与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同，工程漫射体要求对于每个散射中心，通常为微透镜单元，都进行控制。例如全息漫射体可以视为一组随机排列的透镜，但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制：而无法单独操控每个微透镜单元，这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面，在工程漫射体中，每个微透镜单元形成漫射体，由其凹形纵断面和在阵列中的位置所确定。同时，为了确保漫射体不受输入光束变化的影响，并且不产生衍射效果，微透镜单元的分布是随机的，根据产生相应的光束形状函数所选取的概率分布函数来确定。因此，工程漫射体同时保留了随机与确定性漫射体的优点，从而实现高性能的光束整形功能。 P?
n4B \!  
FRED是美国Photon Engineering 公司开发的光学工程仿真软件，其在杂散光分析中独特的算法、高效的准确性，使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 ^ACrWk~UY  
H<<t^,E^.t  
Buh}+n2]5  
 &.s.g\  
步骤 RjO0*$>h  
)s,tBU+N  
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。 )S`[ gK  
K\8zhY  
%0/qb0N&  
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） v'Ehr**]+  
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 74:~F)BP  
例如下所示： yZgWFf.X  
Sample name:  EDF-C1-56 M<NY`7$^  
Merging data from file EDF-C1-56 0-0.txt (y&sUc9  
Finished merging RPC data for sample EDF-C1-56 N|>JLZ>  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt :FH&#Eq~4  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 Meep  
a. 创建一个新的散射库 $ xHtI]T  
b. 散射模型命名 *x]*%  
c. 改变散射模型为“Tabulated BSDF”. qq<T~^  
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 ） Ml{ ]{n  
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。 oaPWeM+  
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， YwF&-~mp7n  
g. 点击OK 19y,O0# _  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 P2aFn=f  
Cj`~ntMN  
G}+@C]  
脚本代码： v@q&B|0  
1jop;{,^  
'#Language "WWB-COM" u7RlxA:  
\-[bU6\A\  
Option Explicit ~"J1@<  
'xG J;pY  
Sub Main D|m3.si  
GQhy4ji'z  
    'Cleanup }d>.Nj#zh  
    ClearOutputWindow() +L.D3  
ITqAy1m@
C  
    Print "Merging RPC Photonics BSDF Data Files" &QW&K  
    SetTextColor(255,0,0) cHT\sJo`l  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." ~xsJML  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." &p_iAMn:9  
    SetTextColor(0,0,0) \~+b&  
!o?&{"#+  
    'Current directory of this script (should be the same as the text files being merged) {,h_T0D^j  
    Dim cDir As String ,Zb  
    cDir = MacroDir$ & "\" ty"L&$bf  
k+P3z&e  
    'Array which will be populated with the list of files to be merged 2YY4 XHQS  
    Dim fList() As String, curFile As String @{_X@Wv4iV  
    GetFileList( cDir, fList ) lMu-,Z="  
ji\LC%U-  
    Print "" h^Yh~84T  
    Print "Files found for merging:" H?Q--pG8  
    For Each curFile In fList S(xs;tZ  
        Print Chr(9) & curFile Z8Y&
#cB  
    Next zx2`0%Q  
Jj=N+,km  
    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. eZ[Qhrc  
    Dim nameArray() As String, sampName As String ED79a:  
    nameArray = Split(fList(0)," 0-0.txt") (}>)X]  
    sampName  = nameArray(0) <\Y(+?+uZ  
    Print "" JeNX5bXW  
    Print "Sample name: " & Chr(9) & sampName d-e/0F!  
H'/V<
%  
    'Open an output file and write the FRED header data [f lK  
    Dim outFile As String G/},lUzLg  
    outFile = cDir & sampName & "_FRED.txt" F {L#  
    Open outFile For Output As #1 >]gB@tn[  
    Print #1, "type bsdf_data" er-0i L@  
    Print #1, "format angles=deg bsdf=value scale=1" @%L  
:{Z%dD  
    'Loop the file list, skip the two header lines and write the remaining data to file HpIi-Es7C  
    Dim lineArray() As String, curLine As Long p"~@q}3  
    For Each curFile In fList /
<$|tp\Rc  
        Print "Merging data from file " & curFile 4~$U#$u_  
        ReadFile( cDir & curFile, lineArray ) sH2xkUp  
        For curLine = 2 To UBound(lineArray) GBRiU&D  
            Print #1, lineArray(curLine) W% Lrp{  
        Next VWK/(>TP  
    Next F}meKc?a  
u1u;
aG  
    'Close the output file {fl[BX]kZ  
    Close #1 &1^~G0Rh\  
`RE>gX  
    Print "Finished merging RPC data for sample " & sampName 2W_[|.;'  
    Print "FRED formatted data file: " & Chr(9) & outFile .-& =\}^2l  
End Sub DA>nYj-s  
R[v<mo[s  
'Utility function to read the contents of a file into an array of strings. mrG?5
.7W  
Function ReadFile(ByVal fileName As String, _ a`^$xOK,  
                  ByRef lineArray() As String) As Long ^/%Y]d$  
-X%twy=  
    ReadFile = -1 GIpYx`mHi  
    Dim oFSO As Object PyHL`PZZ  
    Set oFSO = CreateObject("Scripting.FileSystemObject") }93FWo.  
    Erase lineArray u^E0u^  
H\<0{#F  
    Dim fid As Long =+T0[|gc(r  
    If oFSO.fileexists( fileName ) Then h,BPf5\S  
        fid = FreeFile() |P|2E~[r  
        Open fileName For Input As fid t!J>853  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) Sw-2vnSdM  
        Close fid dJ])`S  
    End If [kr-gV  
    Set oFSO = Nothing @zi0:3`#0\  
    Return UBound( lineArray ) "oZ_1qi<  
8L/XZ)  
End Function gYGoJH1  
(
]I=';\  
Sub GetFileList( ByVal in_dir As String, _ 40].:9VG  
                 ByRef in_flist() As String ) yW7>5r  
fiSX( 9  
    'Redimension the file list array N!dBF t"  
    Erase in_flist f]?&R c2C  
D5bi)@G7z  
    'Tracks how many files are found 55<!H-zt  
    Dim fCount As Long CA&VnO{r  
    fCount = 0 `H*mQERb  
@RuMo"js  
    'Recurse directory and search for text files 3%o}3.P,:@  
    Dim f As String knV*,   
    f = Dir$(in_dir & "*.txt") DQV9=  
    While f <> "" eA
?|X|  
        ReDim Preserve in_flist(fCount) -:45Q{u/  
        in_flist(fCount) = f !~'D;Jh  
        fCount += 1 $w-@Oa*h9U  
        f = Dir$() v<l]K$5J&  
    Wend J n2QvUAZ&  
    ReDim Preserve in_flist(fCount-1) X#ha*u~U  
UMD\n<+cG,  
End Sub Qu8=zI>t  
7!Im|7Ty  
XA.1Y)  
QQ：2987619807 FrLv%tK|