[技术]RPC Photonics扩散片BSDF [复制链接]

摘要： =`{!" 6a  
Q%@l`V)Rs  
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。 l%;)0gT  
\alRBHqE  
背景： RJ@d_~%U  
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。 sHAzg^n}r  
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。 "bC8/^  
)M}bc1 _  
CK
.Z-_M  
oz@yF)/Sm  
步骤 5$N4<Lo7  
BYwG\2?~  
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。 %#"uK:(N  
Rqu;;VI[  
U<o,`y[Tn  
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） )|\72Z~eq  
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 
DUY#RJf  
例如下所示： [|uAfp5R  
Sample name:  EDF-C1-56 |1;0q<Ka  
Merging data from file EDF-C1-56 0-0.txt 6rdm=8WFA  
Finished merging RPC data for sample EDF-C1-56 i7*4hYY  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt W0l|E&fj[  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 ;J2=6np  
a. 创建一个新的散射库 8(&C0_yD  
b. 散射模型命名 %
-H  
c. 改变散射模型为“Tabulated BSDF”. #jK{)%}mA  
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 ） Hd6Qy {,*-  
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。 4z?6[Cg<  
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， aY8>#t?  
g. 点击OK N2=gSEY  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 ~
99Ta]U  
Cv~t~  
}fL8<HM\'c  
脚本代码： 8`9!ocrM  
,,b_x@y*  
'#Language "WWB-COM" M HlP)'  
prhFA3 rW.  
Option Explicit \S1WF?<,  
GfPe0&h  
Sub Main }JAg<qy}  
0.bmVN<  
    'Cleanup K
|E}Ni  
    ClearOutputWindow() x1?
p+  
,$7LMTVDrE  
    Print "Merging RPC Photonics BSDF Data Files" lg;`ItX]  
    SetTextColor(255,0,0) 23&;28)8  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." @U:WWTzf  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." l*xA5ObV  
    SetTextColor(0,0,0) jpT!di  
FL"IPX;
S  
    'Current directory of this script (should be the same as the text files being merged) ^FF{71;
 
    Dim cDir As String !W{|7Es?.  
    cDir = MacroDir$ & "\" VqbMFr<k  
NS mo(c>5  
    'Array which will be populated with the list of files to be merged `p*7MZ9-  
    Dim fList() As String, curFile As String 0XvMaQXQF  
    GetFileList( cDir, fList ) >c8zMd  
mJ !}!~:  
    Print "" ?(;ygjyx  
    Print "Files found for merging:" 0 l G\QT  
    For Each curFile In fList !A&Vg #  
        Print Chr(9) & curFile $BkdC'D  
    Next GDZe6*  
q
yQPR  
    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. W~Eq_J?I  
    Dim nameArray() As String, sampName As String |o|0qG@g  
    nameArray = Split(fList(0)," 0-0.txt") ~$YFfv>  
    sampName  = nameArray(0) /,c9&it(M  
    Print "" Y
&]pC  
    Print "Sample name: " & Chr(9) & sampName DyYl97+Z?  
-QI1>7sl  
    'Open an output file and write the FRED header data ~Se/uL;*  
    Dim outFile As String 2Q-kD?PO,  
    outFile = cDir & sampName & "_FRED.txt" SN\;&(
?G  
    Open outFile For Output As #1 &z&Jl#t-)  
    Print #1, "type bsdf_data" /$/\$f$  
    Print #1, "format angles=deg bsdf=value scale=1" Q0Dw2>~_K  
*~:4&$
 
    'Loop the file list, skip the two header lines and write the remaining data to file wNcf7/ky  
    Dim lineArray() As String, curLine As Long ~,m6g&>R  
    For Each curFile In fList hXmW,+1  
        Print "Merging data from file " & curFile | t3_E  
        ReadFile( cDir & curFile, lineArray ) !H~G_?Mf\O  
        For curLine = 2 To UBound(lineArray) CdC&y}u  
            Print #1, lineArray(curLine) . m@Sk`s  
        Next Ag#p)  
    Next =cX&H  
7z5AI!s_  
    'Close the output file 3' mQ=tKa  
    Close #1 <Mxy&9}ic  
u2@:[:Ao  
    Print "Finished merging RPC data for sample " & sampName n;
/yo~RR  
    Print "FRED formatted data file: " & Chr(9) & outFile #e{l:!uS\  
End Sub vsRn\Y  
m7cp0+Peo  
'Utility function to read the contents of a file into an array of strings. u\<z5O  
Function ReadFile(ByVal fileName As String, _ W7_X=>l  
                  ByRef lineArray() As String) As Long :>\i  

Vj2]-]Cm  
    ReadFile = -1 bmGIxBRq  
    Dim oFSO As Object z|<6y~5,  
    Set oFSO = CreateObject("Scripting.FileSystemObject") |36d<b Io  
    Erase lineArray s1?N&t8c  
![0\m2~iv  
    Dim fid As Long 8I$>e (  
    If oFSO.fileexists( fileName ) Then '[I?G6  
        fid = FreeFile() VK[^v;  
        Open fileName For Input As fid p
>Qzz`@e  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) 9NBFG~)|l[  
        Close fid |p-, B>p!  
    End If +ZQ
f$@+  
    Set oFSO = Nothing 2ed$5.D  
    Return UBound( lineArray ) }i^]uW*h  
NhU~'k  
End Function onI%Jl sq  
$BXZFC_1S  
Sub GetFileList( ByVal in_dir As String, _ -Wd2FD^x  
                 ByRef in_flist() As String ) iqreIMWz  
A,Wwt [Qw  
    'Redimension the file list array aY@]mMz\
 
    Erase in_flist m(i84~  
?#YheML?  
    'Tracks how many files are found 'y[74?1  
    Dim fCount As Long DvB
!-|ek  
    fCount = 0 L-? ?%_=  
,R#pQ 4  
    'Recurse directory and search for text files mvgsf(a*'  
    Dim f As String t(AW2{%}  
    f = Dir$(in_dir & "*.txt") >'ev_eAk  
    While f <> "" l25_J.e  
        ReDim Preserve in_flist(fCount) ~"|MwR!0  
        in_flist(fCount) = f >Q3_-yY+  
        fCount += 1 nWb*u  
        f = Dir$() >9dzl#  
    Wend -:cBVu-m  
    ReDim Preserve in_flist(fCount-1) diHK  
!l NCuR/T  
End Sub 5|O~