[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： q'biTn]2  
y] $-:^  
RPC Photonics公司有高品质的的工程漫射体BSDF测试数据，但它对于FRED帮助甚少，下面这个步骤描述了如何利用FRED脚本转换RPC Photonics提供的TXT文件，并将数据直接应用到FRED的Tabulated scatter 散射模型。 IueI7A  
1py>[II@  
背景： ty9(mtH+  
Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术，可以解决其他技术的不足，大大改善了诸如光刻系统、有效固态照明，显示，背光，显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体（Engineered DiffusersTM）的新概念，与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同，工程漫射体要求对于每个散射中心，通常为微透镜单元，都进行控制。例如全息漫射体可以视为一组随机排列的透镜，但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制：而无法单独操控每个微透镜单元，这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面，在工程漫射体中，每个微透镜单元形成漫射体，由其凹形纵断面和在阵列中的位置所确定。同时，为了确保漫射体不受输入光束变化的影响，并且不产生衍射效果，微透镜单元的分布是随机的，根据产生相应的光束形状函数所选取的概率分布函数来确定。因此，工程漫射体同时保留了随机与确定性漫射体的优点，从而实现高性能的光束整形功能。 L'>0E(D  
FRED是美国Photon Engineering 公司开发的光学工程仿真软件，其在杂散光分析中独特的算法、高效的准确性，使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 0=OvVU;P  
'w\Gd7E  
b&pL}o?/k  
)f%Q7  
步骤 u)P)r,  
Vt4,?"  
1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下，选择“Raw data”文件。 z}7U>y6`  
q&wv{  
-$D#u  
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） <bBgevL+_K  
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 P
sjk 7\  
例如下所示： M:K4o%  
Sample name:  EDF-C1-56 M;@/697G  
Merging data from file EDF-C1-56 0-0.txt 8RVeKnpXTV  
Finished merging RPC data for sample EDF-C1-56 (i^<er q  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt `S=4cSH(  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 qNbgN{4  
a. 创建一个新的散射库 bLz('mUY  
b. 散射模型命名 #w)D ml  
c. 改变散射模型为“Tabulated BSDF”.
8PW3x-+  
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 ） lMXLd91  
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。 Y2y = P  
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， TJ(vq]|&  
g. 点击OK l`AA<Rj*O-  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 RsP^T:M}$  
Q .cL1uHc  
)/?s^D$,  
脚本代码： Cqw`K P  
st(Y{Gs  
'#Language "WWB-COM" M4}zRr([.5  
K6oQx)|  
Option Explicit aw'o=/a8  
xo(3<1mD  
Sub Main xy<)zKp  
Jd/XEs?<q  
    'Cleanup CLY>M`%?+p  
    ClearOutputWindow() 3=kw{r[2lM  
g6<D 1r  
    Print "Merging RPC Photonics BSDF Data Files" n'Z5rXg  
    SetTextColor(255,0,0) ( ESmP  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." A ]~%<=b  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." o7s<G8;?  
    SetTextColor(0,0,0) EcmyY,w  
TInp6w+u  
    'Current directory of this script (should be the same as the text files being merged) uF\f>E)/N%  
    Dim cDir As String DP7B X^e  
    cDir = MacroDir$ & "\" ~px)Jd  
r
*4@S~;  
    'Array which will be populated with the list of files to be merged Je;HAhL  
    Dim fList() As String, curFile As String &<S]=\  
    GetFileList( cDir, fList ) C2Af$7c  
5JRj'G0I  
    Print "" /7XV
r"R  
    Print "Files found for merging:" LDq(WPI1#  
    For Each curFile In fList Fpf-Fa-K\b  
        Print Chr(9) & curFile bjGQ04da  
    Next Ewczq1%l:  
?$rHyI  
    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. m^ [VM&%  
    Dim nameArray() As String, sampName As String "+KAYsVtU  
    nameArray = Split(fList(0)," 0-0.txt") 5QJ
FNE  
    sampName  = nameArray(0) Z%O>|ozpq  
    Print "" !mRDzr7  
    Print "Sample name: " & Chr(9) & sampName )1S"D~j-  
q|7$@H^*  
    'Open an output file and write the FRED header data ,*'aH z  
    Dim outFile As String 9jTm g%  
    outFile = cDir & sampName & "_FRED.txt" dW>$C_`?  
    Open outFile For Output As #1 5X"WgR;  
    Print #1, "type bsdf_data" 05Go*QvV  
    Print #1, "format angles=deg bsdf=value scale=1" joJ:*oL  
K_E- Hgg_  
    'Loop the file list, skip the two header lines and write the remaining data to file [I7([l1Wvd  
    Dim lineArray() As String, curLine As Long Pi:=0,"XOp  
    For Each curFile In fList B(|dT66K  
        Print "Merging data from file " & curFile 5Dlx]_  
        ReadFile( cDir & curFile, lineArray ) #mcU);s  
        For curLine = 2 To UBound(lineArray) 2k3yf_N  
            Print #1, lineArray(curLine) TZ+2S
93c  
        Next P_3U4J  
    Next n^Sc*7  
v&*}O  
    'Close the output file JqmKD4p  
    Close #1 j>t*k!db  
t.E
3Fh!o  
    Print "Finished merging RPC data for sample " & sampName "sU ~|  
    Print "FRED formatted data file: " & Chr(9) & outFile K~JXP5`(  
End Sub N`%f+eT(  
0al8%z9e@  
'Utility function to read the contents of a file into an array of strings. [v$NxmRu  
Function ReadFile(ByVal fileName As String, _ IB+)2`  
                  ByRef lineArray() As String) As Long M,b^W:('4  
%!e;sL~&  
    ReadFile = -1 Co#_Cyxg=9  
    Dim oFSO As Object .JkF{&=B  
    Set oFSO = CreateObject("Scripting.FileSystemObject") z7P]g C$\  
    Erase lineArray qEbzF#a-:  
Vz,2_QJ  
    Dim fid As Long @|GKNW#  
    If oFSO.fileexists( fileName ) Then
_C97G&  
        fid = FreeFile() CAD:ifV  
        Open fileName For Input As fid qxe%RYdA'j  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) +w pe<T  
        Close fid kbkq
.f
Yr  
    End If B=`"!?we  
    Set oFSO = Nothing H\Jpw  
    Return UBound( lineArray ) d@72z r  
0fTEb%z8  
End Function [d_sd  
GI:$(<  
Sub GetFileList( ByVal in_dir As String, _ Qb;5:U/x  
                 ByRef in_flist() As String ) br9`77J8  
nE)|6  
    'Redimension the file list array s*B-|  
    Erase in_flist sC .R.  
mrfc.{`[  
    'Tracks how many files are found 20t</lq.  
    Dim fCount As Long 5vso%}c  
    fCount = 0 UUt631  
q|A-h'  
    'Recurse directory and search for text files d^w*!<8
 
    Dim f As String |e@Bi#M[  
    f = Dir$(in_dir & "*.txt") G Riu]   
    While f <> "" ymsqJ   
        ReDim Preserve in_flist(fCount) d">Ya !W  
        in_flist(fCount) = f \O7?!i  
        fCount += 1 0+\~^  
        f = Dir$() =/Dp*  
    Wend ]PnE%  
    ReDim Preserve in_flist(fCount-1) JqdNO:8  
E5%ae (M^  
End Sub L^`oJ9k!  
Mlpq2I_x  
D^Z~>D6  
QQ：2987619807 GZN@MK*co