[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： RAxAy{  
d}GO(  
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。 8p }E  
X!2/cgU7  
背景： U{gJn#e/.  
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。 ;,}tXz  
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。 E)|fKds  
RcitW;{|Kg  
lwIU|T<4  
!n~p?joJ*  
步骤 kep.+t[  
/[`bPKr  
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。 {x40W0  
^|5bK_Z&  
y+\nj3v6  
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） '9>z4G*Td  
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 m;)[gF  
例如下所示： 3de<H=H'  
Sample name:  EDF-C1-56 `%EMhk  
Merging data from file EDF-C1-56 0-0.txt K]yCt~A$  
Finished merging RPC data for sample EDF-C1-56 V)V\M6  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt 0&E{[~Pv  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 W]{mEB  
a. 创建一个新的散射库 Gt{~u^<  
b. 散射模型命名 j4$XAq~W  
c. 改变散射模型为“Tabulated BSDF”. J)D/w[w  
d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） PXz,[<ET?#  
e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 >_XRh  
f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， pi[:"}m]/P  
g. 点击OK R_eKKi@VH  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 >y#<WB$i  
c&z@HEzV7  
%|bqL3)a_  
脚本代码： B@D3aOvO  
@6w\q?.s  
'#Language "WWB-COM" ,Ua`BWF  
d#cw`h<c~  
Option Explicit Q"n|<!DN  
;
0(|06=  
Sub Main (Vnv"= (  
N '2
Nv  
    'Cleanup V\r!H>   
    ClearOutputWindow() 7'\<\oT  
&$ZJfHD@  
    Print "Merging RPC Photonics BSDF Data Files" 9ar+Ph@*  
    SetTextColor(255,0,0) gf7%vyMo$  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." ?a+>%uWt  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." 9E~=/Q=  
    SetTextColor(0,0,0) >xb}AY;  
42kr&UY&  
    'Current directory of this script (should be the same as the text files being merged) q'9u8b  
    Dim cDir As String :t+XW`eQR:  
    cDir = MacroDir$ & "\" tP8>0\$)  
`2Rd=M]?  
    'Array which will be populated with the list of files to be merged =S7Xj`/  
    Dim fList() As String, curFile As String 9;KQ3.Fa}q  
    GetFileList( cDir, fList ) h BD .IB  
musZCg$  
    Print "" *o <S{  
    Print "Files found for merging:" U
[1Rw6  
    For Each curFile In fList feSd%  
        Print Chr(9) & curFile xsn2Qn/P  
    Next h3U| ~h  
Y3^UJe7E  
    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 1S .~Vh0Q,  
    Dim nameArray() As String, sampName As String 1{{z[w#  
    nameArray = Split(fList(0)," 0-0.txt") *\><MXx  
    sampName  = nameArray(0) q9 !)YP+w  
    Print "" KPc`5X  
    Print "Sample name: " & Chr(9) & sampName CR3<9=Lv>  
n?'I&0>M  
    'Open an output file and write the FRED header data }}L :6^  
    Dim outFile As String ?Co)7}N  
    outFile = cDir & sampName & "_FRED.txt" IJ >qs8  
    Open outFile For Output As #1 ^ z!g3  
    Print #1, "type bsdf_data" 3VNYDY`>  
    Print #1, "format angles=deg bsdf=value scale=1" x{y}pH"H  
.)J7 \z8m  
    'Loop the file list, skip the two header lines and write the remaining data to file 03Czx`  
    Dim lineArray() As String, curLine As Long H8@1Kt  
    For Each curFile In fList &/o4R:i  
        Print "Merging data from file " & curFile J?9K|4 )  
        ReadFile( cDir & curFile, lineArray ) }o^VEJc`O  
        For curLine = 2 To UBound(lineArray) RN2^=$'.  
            Print #1, lineArray(curLine) KWwEK]  
        Next IqEE.XhaK  
    Next UqHk
2h-  
v;_m1UpuW  
    'Close the output file pK/r{/>r  
    Close #1 R.nAD{>h*  
<!@*2/Q]J]  
    Print "Finished merging RPC data for sample " & sampName gt]
k#(S  
    Print "FRED formatted data file: " & Chr(9) & outFile $=&a0O#  
End Sub ppL*#/jYt  
|7XPu  
'Utility function to read the contents of a file into an array of strings. (@wgNA-P  
Function ReadFile(ByVal fileName As String, _ DAYR=s  
                  ByRef lineArray() As String) As Long .tRp  
-;T!d  
    ReadFile = -1 ITpo:"X g  
    Dim oFSO As Object LdAWCBLS  
    Set oFSO = CreateObject("Scripting.FileSystemObject") I$yFCdXr  
    Erase lineArray e3T&KyPm?+  
7I\qEr57  
    Dim fid As Long (x)}k&B;  
    If oFSO.fileexists( fileName ) Then ::goqajV  
        fid = FreeFile() X8m@xFW}  
        Open fileName For Input As fid sn>2dRW{  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) U1oZ\Mh  
        Close fid M{(g"ha  
    End If 'c]Fhe fb  
    Set oFSO = Nothing [2~^~K  
    Return UBound( lineArray ) !UPKy$  
VPC7Dh%.  
End Function :`jB1rI  
)-jA4!&  
Sub GetFileList( ByVal in_dir As String, _ _mBFmXHHS$  
                 ByRef in_flist() As String ) 19#s:nt9  
'.{tE*  
    'Redimension the file list array w; rQ\gj  
    Erase in_flist EU5^"\  
^$>Q6.x?*)  
    'Tracks how many files are found e^
Aw%t  
    Dim fCount As Long q7#4e?1  
    fCount = 0 VWLqJd>tr1  
P]A~:Lj  
    'Recurse directory and search for text files S1vUP5cZ  
    Dim f As String 0pfgE=9  
    f = Dir$(in_dir & "*.txt") ?R!?}7  
    While f <> "" Cf~vT"  
        ReDim Preserve in_flist(fCount) v?Ds|  
        in_flist(fCount) = f dQ.:xu}~  
        fCount += 1 JKjVrx> @  
        f = Dir$() fo$s9g^<  
    Wend 7M.TLV!f]  
    ReDim Preserve in_flist(fCount-1) +hZ{/  
d~QZcR  
End Sub UM(`Oh8  
H6.  
9M]%h  
QQ：2987619807 5$PDA*]9