[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： Z t`j\^4n  
|9]PtgQv7  
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。 ]GS~i+=M  
^uBwj}6  
背景： .;%q/hP  
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。 ?cBO6^  
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。 BHiOQ0Fs  
aiR5/ ZD  
4I.1D2 1jA  
$eCGez<E  
步骤 /Su)|[/'  
^n71'MW  
1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下，选择“Raw data”文件。 5&|5 a} 8  
_sm;HH7'*  
yam}x*O\xn  
2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。（脚本代码放在了本文的最后） z.59]\;U>  
3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 fv5C!> t  
例如下所示： FAd``9kRT  
Sample name:  EDF-C1-56 Gy^FrF  
Merging data from file EDF-C1-56 0-0.txt afy
/K'~  
Finished merging RPC data for sample EDF-C1-56 E.#6;HHzN  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt ^+a  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 SauHFl8?  
a. 创建一个新的散射库 x,-S1[#X;  
b. 散射模型命名 =WjJN Q  
c. 改变散射模型为“Tabulated BSDF”. n>T:
2PQ3  
d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） B<C&ay  
e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 AJ
4r/b}  
f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， ;&7,73!  
g. 点击OK |=,83,a  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 wEK%T P4  
'2wCP EC  
B{=009.  
脚本代码： l<n5gfJ  
\AHY[WKx  
'#Language "WWB-COM" Za9$Hh/X  
W1<.OO\J  
Option Explicit p70,\&@3  
~ ;XYwQ"  
Sub Main l-MxLcz  
Wv NI=>  
    'Cleanup ,P!D-MN$V  
    ClearOutputWindow() :F9q>  
uNg'h/^NZ|  
    Print "Merging RPC Photonics BSDF Data Files" Q-jf8A]  
    SetTextColor(255,0,0) QK'`=MU  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." kLq(!Gs  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." ?'Oj=k"c7  
    SetTextColor(0,0,0) {Wa~}1`Kl  

L2d:.&5  
    'Current directory of this script (should be the same as the text files being merged) 6#O#T;f)  
    Dim cDir As String S$\.4*_H\  
    cDir = MacroDir$ & "\" *3P3M}3~\  
CQ$::;  
    'Array which will be populated with the list of files to be merged ]ZDTn  
    Dim fList() As String, curFile As String zw,-.fmM#  
    GetFileList( cDir, fList ) /Ht/F)&P  
@+$cZ3,
 
    Print "" B%2L1T=  
    Print "Files found for merging:" -E}>h[;qZ  
    For Each curFile In fList d&5c_6oW  
        Print Chr(9) & curFile xM%`KP.8X  
    Next wy YtpW  
6<<'bi  
    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. UKOFT6|  
    Dim nameArray() As String, sampName As String K]ca4Z  
    nameArray = Split(fList(0)," 0-0.txt") -.^
3;-[  
    sampName  = nameArray(0) eQ$e*|}"m  
    Print "" Oy:QkV9  
    Print "Sample name: " & Chr(9) & sampName fEB195#@9  
F. }l(KuJ  
    'Open an output file and write the FRED header data cxY$LY!zX  
    Dim outFile As String >dyhox2*"  
    outFile = cDir & sampName & "_FRED.txt" 6$;L]<$W>  
    Open outFile For Output As #1 uC- A43utv  
    Print #1, "type bsdf_data" FOeVRq:#  
    Print #1, "format angles=deg bsdf=value scale=1" sr;:Dvx~  
;*W=c  
    'Loop the file list, skip the two header lines and write the remaining data to file I88Zrhw  
    Dim lineArray() As String, curLine As Long hHCzj*5  
    For Each curFile In fList \Bt=bu>Z  
        Print "Merging data from file " & curFile R!@|6=]iG  
        ReadFile( cDir & curFile, lineArray ) .N/GfR`0/<  
        For curLine = 2 To UBound(lineArray) ax4*xxU  
            Print #1, lineArray(curLine) sfyBw  
        Next 3R'.}^RN  
    Next |3S'8OeCI  
P`p6J8}4  
    'Close the output file %)8d{1at  
    Close #1 m dC`W&r  
sS-W~u|C  
    Print "Finished merging RPC data for sample " & sampName =Na/3\^WP  
    Print "FRED formatted data file: " & Chr(9) & outFile V_Xy2<V  
End Sub kNRyOUy  
>vHH  
'Utility function to read the contents of a file into an array of strings. T_uNF8Bh  
Function ReadFile(ByVal fileName As String, _ zpbcmQB*  
                  ByRef lineArray() As String) As Long mPckf  
XIqv{w  
    ReadFile = -1 $[j-C9W  
    Dim oFSO As Object "fRlEO[9  
    Set oFSO = CreateObject("Scripting.FileSystemObject") 'CS^2Z  
    Erase lineArray 3aEt>x  
1a5?)D  
    Dim fid As Long 03~+-h&n  
    If oFSO.fileexists( fileName ) Then RlU;v2Kch  
        fid = FreeFile() ?68$3;  
        Open fileName For Input As fid c=jcvDQ6W  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) tDEXm^B2Sv  
        Close fid L& I` #  
    End If [&1iF1)4  
    Set oFSO = Nothing V/`#B$6  
    Return UBound( lineArray ) |)28=Z|Z  
mG>T`c|r3  
End Function J'|=*#  
_2]e1_=  
Sub GetFileList( ByVal in_dir As String, _ sVE>=0TVP  
                 ByRef in_flist() As String ) /uC+.B9k  
)WaX2uDA?  
    'Redimension the file list array qRgK_/[]  
    Erase in_flist | \AbL!u  
-;l`hRW  
    'Tracks how many files are found M7`UoTc+>d  
    Dim fCount As Long dD[v=Z_  
    fCount = 0 .Ql;(Wyl  
3Qqnw{*  
    'Recurse directory and search for text files g ^D)x[  
    Dim f As String x%b]ea  
    f = Dir$(in_dir & "*.txt") CHQ{+?#  
    While f <> "" \B*k_W/r@  
        ReDim Preserve in_flist(fCount) w~bG<kxP  
        in_flist(fCount) = f 9c"0~7v  
        fCount += 1 xnl<<}4pJ  
        f = Dir$() r0~7v1rG  
    Wend $ 1akI  
    ReDim Preserve in_flist(fCount-1)  rE/}hHU  
38"8,k  
End Sub @).WIs  
o@qN#Mg?>}  
]+}:VaeA  
QQ：2987619807 ],BJ}~v,X