[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： u`gy1t `  
J0d +q!  
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。 Rk"VFe
>r  
]B3 0d  
背景： =H>rX 2k  
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。 RW,ew!Z  
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。 WB6g i2  
x2Y1B  
}!Qo wG  
/B|#GJ\\3  
步骤 un W{ZfEC  
+3si=x\=/  
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。 oxPOfI1%]  
bk2HAG  
]AERi] B  
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） Z)P x6\?+  
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 tI*u"%#t  
例如下所示： DcSL f4A  
Sample name:  EDF-C1-56 K&BlWXT  
Merging data from file EDF-C1-56 0-0.txt O5Yk=-_m  
Finished merging RPC data for sample EDF-C1-56 /:ma}qGy  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt %+gze|J  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 eU@yw1N  
a. 创建一个新的散射库 ^yy\CtG  
b. 散射模型命名 Ad@))o2  
c. 改变散射模型为“Tabulated BSDF”. &r~~1BnpHm  
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 ） jtQ2vJ-  
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。 6x*ImhQ.J  
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， %[lX  H  
g. 点击OK Jc`LUJT  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 cX7xG U  
kVkV~  
%j2YCV7  
脚本代码： &m>`+uVBP  
&oTSff>p}  
'#Language "WWB-COM" AJt0l|F  
4mNL;O  
Option Explicit S.t+HwVodO  
4{CVBowi  
Sub Main \
dIIZSN  
0u'2f`p*  
    'Cleanup C~'}RM  
    ClearOutputWindow() ^5=}Y>EJO  
Y<w2_+(  
    Print "Merging RPC Photonics BSDF Data Files" Yi7`iC  
    SetTextColor(255,0,0) =zqOkC h$  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." SQ>.P  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." E`LML?  
    SetTextColor(0,0,0) swi|   
zhHQJcQ.  
    'Current directory of this script (should be the same as the text files being merged) g@MTKqs  
    Dim cDir As String ReZ|q5*  
    cDir = MacroDir$ & "\" #96E^%:zL  
E^A9u
|x  
    'Array which will be populated with the list of files to be merged ThJLaNS  
    Dim fList() As String, curFile As String .[= 0(NO  
    GetFileList( cDir, fList ) )w;XicT  
h(GgkTj4+  
    Print "" ,GVHwTZ0`  
    Print "Files found for merging:" JaG<.ki  
    For Each curFile In fList *ubLuC+b  
        Print Chr(9) & curFile ofcoNLX5c  
    Next +;:i,`Lmg  
1
ReO.Dd`R  
    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. aina6@S  
    Dim nameArray() As String, sampName As String +P}'2tE~'  
    nameArray = Split(fList(0)," 0-0.txt") :E4i@ O7%  
    sampName  = nameArray(0) [7|}h/  
    Print "" c{|soc[#  
    Print "Sample name: " & Chr(9) & sampName <gf:QX!  
F~W*"i+EZ  
    'Open an output file and write the FRED header data <X|"5/h  
    Dim outFile As String RX?Nv4-  
    outFile = cDir & sampName & "_FRED.txt" f+fF5Z\  
    Open outFile For Output As #1 >,uof?  
    Print #1, "type bsdf_data" Gp;[WY\  
    Print #1, "format angles=deg bsdf=value scale=1" ;Qk*h'}f  
*% Vd2jW/  
    'Loop the file list, skip the two header lines and write the remaining data to file kj@#oLd%  
    Dim lineArray() As String, curLine As Long *=@Z\]"?  
    For Each curFile In fList I4qzdD  
        Print "Merging data from file " & curFile _V-@95fK  
        ReadFile( cDir & curFile, lineArray ) ,o*b-Cv/  
        For curLine = 2 To UBound(lineArray) 8 l}tYl`|  
            Print #1, lineArray(curLine) YCw^u  
        Next 47`{ e_YP0  
    Next akJ{-   
j(/"}d3osm  
    'Close the output file  ?o9l{4~g  
    Close #1 GdL\  
*=^
_K`y  
    Print "Finished merging RPC data for sample " & sampName AGK+~EjL@  
    Print "FRED formatted data file: " & Chr(9) & outFile wqA5GK>m2  
End Sub \m5:~,p=  
^row=5]E  
'Utility function to read the contents of a file into an array of strings. MSRIG-  
Function ReadFile(ByVal fileName As String, _ '~liDz*O   
                  ByRef lineArray() As String) As Long W!XFaA$  
\&ERSk2  
    ReadFile = -1 G\jr^d\  
    Dim oFSO As Object hl6al:Y  
    Set oFSO = CreateObject("Scripting.FileSystemObject") |06J4H~k  
    Erase lineArray 7-W(gD!`  
e!eWwC9u  
    Dim fid As Long Lm-}W "7  
    If oFSO.fileexists( fileName ) Then X=${`n%LG  
        fid = FreeFile() LP=!u~?  
        Open fileName For Input As fid sDJ5'ul  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) Q`r1pO  
        Close fid /xrt,M@  
    End If iLv"ZqGrw  
    Set oFSO = Nothing ,2&'8:B  
    Return UBound( lineArray ) ^C<dr}8  
^]E| >~\  
End Function >s[}f6*2@  
[h%_`8z  
Sub GetFileList( ByVal in_dir As String, _ z)QyQ  
                 ByRef in_flist() As String ) <C${1FO7If  
%4n=qK9T5  
    'Redimension the file list array 0A5xG&  
    Erase in_flist  b$rBxe\  
2R<1^  
    'Tracks how many files are found JK,#dA#
 
    Dim fCount As Long ;#rtV;  
    fCount = 0 d{ OY  
Br-y`s~cP  
    'Recurse directory and search for text files r~t&;yRv  
    Dim f As String TN/I(pkt1B  
    f = Dir$(in_dir & "*.txt") {oz04KGsH  
    While f <> "" mN@0lfk;  
        ReDim Preserve in_flist(fCount) Lc<Gny^  
        in_flist(fCount) = f wx<5*8zP  
        fCount += 1 1<bSHn9  
        f = Dir$() J0o U5d=3  
    Wend 3b%y+?-{\u  
    ReDim Preserve in_flist(fCount-1) H26j]kY  
 0Apvuf1  
End Sub (_<ruwV]`  
QbOmJQ  
1AoBsEnd  
QQ：2987619807 )o9CFhFB