[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： "J&WH~8+N  
b5~p:f-&4B  
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。 Ii3F|Vb G  
YHgNL LZ?  
背景： ]2&RN@   
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。 6 %`h2Z  
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。 qs8^qn0A  
=(R3-['QIb  
U0W2  
hZ|0<u  
步骤 b"Nd8f[  
pL*aU=FjQ  
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。 Yp3y%n  
>CcDG  
JS?%zj&@  
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） ([SJ6ff]&  
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 'aeuL1mz  
例如下所示： F *U.cJ%  
Sample name:  EDF-C1-56 ;i [;%  
Merging data from file EDF-C1-56 0-0.txt wrJ"(:VZ  
Finished merging RPC data for sample EDF-C1-56 ;S&anC#E  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt WS@"
8+re;  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 PgP\v-.  
a. 创建一个新的散射库 wS
ZMHIW  
b. 散射模型命名 1'\s7P  
c. 改变散射模型为“Tabulated BSDF”. |g!$TUS.  
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 ） j5smmtM`s  
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。 J_<6;#  
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， IQ$6}.  
g. 点击OK 9B>P Qbs  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 2J)  
^mut-@ N9  
)RWY("SUy1  
脚本代码： y34<B)Wy  
w%oa={x  
'#Language "WWB-COM" " w /Odd  
yYTOp^  
Option Explicit 3<1x>e2nT  
#*S.26P^4  
Sub Main Qip@L WvT  
bx-:aC)]2  
    'Cleanup lG[j,MDs  
    ClearOutputWindow() "d0D8B7HI@  
o>]z~^c  
    Print "Merging RPC Photonics BSDF Data Files" `0+-:sXZ6  
    SetTextColor(255,0,0) r0pwKRE~t  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." F0kAQgUv  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." _0
ZBG(  
    SetTextColor(0,0,0) YKOj  
3".#nN  
    'Current directory of this script (should be the same as the text files being merged) [{>1wJ Pdj  
    Dim cDir As String .jbxA2  
    cDir = MacroDir$ & "\" ,nV4%Aa  
=?\%E[j  
    'Array which will be populated with the list of files to be merged n7/&NiHxv/  
    Dim fList() As String, curFile As String I%<pS,p  
    GetFileList( cDir, fList ) X]W(  
}YM[aq?6  
    Print "" g`2Oh5dA  
    Print "Files found for merging:" 9pWSvalw9  
    For Each curFile In fList {DUtdu[  
        Print Chr(9) & curFile <LJb,l"  
    Next Bob-qCBV  
F]0 qt$GO  
    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. &xt GabNk  
    Dim nameArray() As String, sampName As String pWH,nn?w.  
    nameArray = Split(fList(0)," 0-0.txt") |GP&!]  
    sampName  = nameArray(0) b9v<Jk  
    Print "" |tse"A5Z  
    Print "Sample name: " & Chr(9) & sampName PY+4OZ$  
V&Rwj_Y  
    'Open an output file and write the FRED header data 43O5|8o  
    Dim outFile As String 1FT3d  
    outFile = cDir & sampName & "_FRED.txt" Krl9O]H/[  
    Open outFile For Output As #1 Y|tK19  
    Print #1, "type bsdf_data" W|s";EAM  
    Print #1, "format angles=deg bsdf=value scale=1" OpK_?XG  
vWa\8yf  
    'Loop the file list, skip the two header lines and write the remaining data to file BP\6N%HC%&  
    Dim lineArray() As String, curLine As Long U9 mK^  
    For Each curFile In fList <zAYq=IU  
        Print "Merging data from file " & curFile vF[ 4kDHk  
        ReadFile( cDir & curFile, lineArray ) dB:c2  
        For curLine = 2 To UBound(lineArray) 2Je]dj4  
            Print #1, lineArray(curLine) ;=6EBP%  
        Next ;&O *KhLH  
    Next |WOc0M[U  
Ea-U+7JC  
    'Close the output file {.y_{yWo  
    Close #1 }WBHuVcZG  
K5jeazasp  
    Print "Finished merging RPC data for sample " & sampName TgHUH>k  
    Print "FRED formatted data file: " & Chr(9) & outFile $~
%h4  
End Sub ,g,Hb\_R)  
$2-_j)+  
'Utility function to read the contents of a file into an array of strings. V\l@_%D[(v  
Function ReadFile(ByVal fileName As String, _ sc6NON#  
                  ByRef lineArray() As String) As Long l/\D0\x2  
:)&vf<JL  
    ReadFile = -1 g=
,}j]tl  
    Dim oFSO As Object 9b@yDq3hQ  
    Set oFSO = CreateObject("Scripting.FileSystemObject") ;BKU _}k=  
    Erase lineArray B<a` o&?  
8lA,3'z  
    Dim fid As Long dep"$pys>  
    If oFSO.fileexists( fileName ) Then YBF$/W+=9|  
        fid = FreeFile() f$vTDak  
        Open fileName For Input As fid %&q}5Y4!  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) 4%I[.dBnM  
        Close fid >VX'`5r>uw  
    End If tCar:p4$  
    Set oFSO = Nothing MX.?tN#F|H  
    Return UBound( lineArray ) ErQ6a%~,  
<iGW~COd  
End Function Wcm8,?*  
]0j_yX  
Sub GetFileList( ByVal in_dir As String, _ L' bY,D(J>  
                 ByRef in_flist() As String ) f*9O39&|  
U=U5EdN;  
    'Redimension the file list array ,LxkdV  
    Erase in_flist %/5Wj_|p  
"^
a"`?J  
    'Tracks how many files are found ;oDr8a<A  
    Dim fCount As Long ()F{kM8  
    fCount = 0 m7u`r(&  
nj0]c`6rN@  
    'Recurse directory and search for text files B;W%P.<.  
    Dim f As String D!.1R!(Z  
    f = Dir$(in_dir & "*.txt") I3d}DpPx%  
    While f <> "" o P;6i  
        ReDim Preserve in_flist(fCount) nAAv42j[  
        in_flist(fCount) = f >}W[>WReI  
        fCount += 1 9cU9'r# h  
        f = Dir$()
<gfRAeXA  
    Wend E-FR w  
    ReDim Preserve in_flist(fCount-1) !6@'H4cb=  
Pz\K3-  
End Sub .>P:{''  
r@bh,U$  
Eh|,[D!E  
QQ：2987619807 kxJ[Bi#