[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： /sH3Rk.>  
e//28=OH  
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。 I 6a{'c(P  
LCK  
背景： =;0#F&  
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。 "{&\
nt  
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。 :^71,An >E  
ouK&H|'  
P*T'R  
]]Ypi=<'  
步骤  $.(%7[  
<g5Btwo%  
1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下，选择“Raw data”文件。 @3c
5"  
xIf,1g@Cq9  
U5z^R>k  
2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。（脚本代码放在了本文的最后） AQU4~g mI  
3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 X{o.mN  
例如下所示： s<H0ka@  
Sample name:  EDF-C1-56 ,(}7 ST  
Merging data from file EDF-C1-56 0-0.txt >5#`j+8=q  
Finished merging RPC data for sample EDF-C1-56 kYl$V=  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt pMYEL  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 EE#4,d`J  
a. 创建一个新的散射库 nM34zVy  
b. 散射模型命名 Z$kff-Y4  
c. 改变散射模型为“Tabulated BSDF”. Xz4!#,z/  
d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） 4Z"DF)+}  
e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 >,Zjlkh3  
f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， Aga2 I#1r  
g. 点击OK q-eC=!#}  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 kB_GL>fc  
1mgLH  
#+|{l*>  
脚本代码： |8c3%jve  
vr/V_  
'#Language "WWB-COM" n'v[[bmu  
YwQxN"  
Option Explicit ~tn*y4uK  
}RYr)  
Sub Main t@QaxZIlt;  
[!,&A{.!  
    'Cleanup >B U0B  
    ClearOutputWindow() Mi,yg=V  
nZ>qM]">u  
    Print "Merging RPC Photonics BSDF Data Files" HsGXb\  
    SetTextColor(255,0,0) Q}d6+C  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." %N7b XKDP  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." L&MR%5  
    SetTextColor(0,0,0) E#v}//  
lPSyFb"  
    'Current directory of this script (should be the same as the text files being merged) [U]U *x  
    Dim cDir As String !JzM<
hyg3  
    cDir = MacroDir$ & "\" qxf!]jm  
b4ZZyw  
    'Array which will be populated with the list of files to be merged A&jkc'  
    Dim fList() As String, curFile As String Ij` %'/J  
    GetFileList( cDir, fList ) S3EY9:^C  
8{#WF#  
    Print "" V$VqYy9 *  
    Print "Files found for merging:" M' e<\wqm  
    For Each curFile In fList vP`Sz}FU  
        Print Chr(9) & curFile zR6,?Tzg  
    Next ~ P"@^cq  
f5"1WtB  
    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. ^90';ACFy  
    Dim nameArray() As String, sampName As String u)Y~+ [Q  
    nameArray = Split(fList(0)," 0-0.txt") +%7v#CY &  
    sampName  = nameArray(0) M(KsLu1   
    Print "" @)1>ba  
    Print "Sample name: " & Chr(9) & sampName ,Md8A`7x~  
SE.r 'J0  
    'Open an output file and write the FRED header data jzI70+E  
    Dim outFile As String K'%2'd  
    outFile = cDir & sampName & "_FRED.txt" f(:+JH<P~  
    Open outFile For Output As #1 ?;zu>4f|  
    Print #1, "type bsdf_data" FkY}6  
    Print #1, "format angles=deg bsdf=value scale=1" Q^prHn*@  
Q@?8-  
    'Loop the file list, skip the two header lines and write the remaining data to file C]414Ibi  
    Dim lineArray() As String, curLine As Long 3O7]~5 j1  
    For Each curFile In fList x? tC2L  
        Print "Merging data from file " & curFile _8A  
        ReadFile( cDir & curFile, lineArray ) U$v|c%6  
        For curLine = 2 To UBound(lineArray) I{tY;b'w  
            Print #1, lineArray(curLine) ]6L;  
        Next :+NZW9_  
    Next 1AQVj]#S  
mivb}cKM  
    'Close the output file 6!zBLIYFI  
    Close #1 uNCM,J!#~  
">cLPXX  
    Print "Finished merging RPC data for sample " & sampName 3n;>k9{  
    Print "FRED formatted data file: " & Chr(9) & outFile ~k\Dde  
End Sub -{`8Av5)E%  
k#F |  
'Utility function to read the contents of a file into an array of strings. Q
,R>dkS  
Function ReadFile(ByVal fileName As String, _ F]e`-;  
                  ByRef lineArray() As String) As Long 7]W6\Z  
60,z!Vv  
    ReadFile = -1 %jk7JDvl  
    Dim oFSO As Object x1H1[0w,i  
    Set oFSO = CreateObject("Scripting.FileSystemObject") 'yxN1JF  
    Erase lineArray m%m<-.'-  
[As9&]Bv5  
    Dim fid As Long Zc9@G-  
    If oFSO.fileexists( fileName ) Then Ak3cE_*Y/  
        fid = FreeFile() _P
T5  
        Open fileName For Input As fid cq]JD6937  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) p3r("\Za,  
        Close fid 9gq+,g>E_  
    End If 2[|52+zhc  
    Set oFSO = Nothing m%zo? e  
    Return UBound( lineArray ) Hb}O/G$a*  
ebno:)  
End Function S
U,G0.  
QN47+)cVt"  
Sub GetFileList( ByVal in_dir As String, _ qm^|7m^  
                 ByRef in_flist() As String ) %,T=|
5  
n(I,pF  
    'Redimension the file list array P5Lb)9_Jw  
    Erase in_flist M~%P1@%  
#($~e|  
    'Tracks how many files are found '8J!(+  
    Dim fCount As Long $UNC0(4  
    fCount = 0 .~$!BWP  
$%B
I8_  
    'Recurse directory and search for text files )<Fq}Q86  
    Dim f As String /RVwhA+c  
    f = Dir$(in_dir & "*.txt") U#V&=~-  
    While f <> "" UQZl:DYa  
        ReDim Preserve in_flist(fCount) R [ZY;g:p  
        in_flist(fCount) = f K|pg'VT"  
        fCount += 1 
Q XSS  
        f = Dir$() FKZ'6KM&A  
    Wend P~ : N  
    ReDim Preserve in_flist(fCount-1) 6ChFsteGFr  
XHU\;TF  
End Sub 3rVfBz  
GP>\3@>  
O&dBLh!G  
QQ：2987619807 |`ya+/ff+