[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： }}_l@5  
:^a$ve3(Jq  
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。 Uw"  
7i.aZ2a%  
背景： ( Iew%U  
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。 K>y+3HN[6  
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。 f6nltZ  

K<GCP2  
I]X<L2  
@H
I5;z  
步骤 Hr$5B2'  
-;}Wm[  
1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下，选择“Raw data”文件。 gp=0;#4 4  
~55>uw<  
X;h~s:LM  
2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。（脚本代码放在了本文的最后） '! (`?  
3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 1~
Nz6  
例如下所示： "Q1hP9xV  
Sample name:  EDF-C1-56 Kl?1)u3^4  
Merging data from file EDF-C1-56 0-0.txt tPsU7bFk  
Finished merging RPC data for sample EDF-C1-56 ]mSVjF3l  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt {y'kwU  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 &kvVMnok  
a. 创建一个新的散射库 Gj=il-Po  
b. 散射模型命名 zeX?]@]Y  
c. 改变散射模型为“Tabulated BSDF”. )Pq.kn{Sp  
d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） R9(
^CWs  
e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 bX,Z<BvbF  
f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， P;Ox|  
g. 点击OK /l L*U  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 ;G$FLL1   
dkjL;1  
vs~*=d27Pf  
脚本代码： lxZXz JkqZ  
h.nzkp5  
'#Language "WWB-COM" ?W()Do1tR  
v;SJgZK  
Option Explicit a'BBp6  
c{~*\&  
Sub Main -IE;5f#e  
NQmDm!-4  
    'Cleanup 2;/hF
wm  
    ClearOutputWindow() <d4^gAfs*  
;6?K&}J)-  
    Print "Merging RPC Photonics BSDF Data Files" qcqf9g  
    SetTextColor(255,0,0) P+[R0QS  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." U/>5C:  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." 7DDot_qb  
    SetTextColor(0,0,0) 945psG@|  
JmkJ^-A 6  
    'Current directory of this script (should be the same as the text files being merged) 9 wc=B(a|  
    Dim cDir As String &PbH!]yd  
    cDir = MacroDir$ & "\" ~c4Y*]J  
Lxl?6wZ  
    'Array which will be populated with the list of files to be merged N}\i!YUD  
    Dim fList() As String, curFile As String nP.d5%E  
    GetFileList( cDir, fList ) 79\ =)m}$Q  
d<]/,BY'  
    Print "" ]Sh&8 #  
    Print "Files found for merging:" AK[c!mzx  
    For Each curFile In fList ;k>{I8L~  
        Print Chr(9) & curFile tZJKB1#WbP  
    Next |$Td-M^)  
yDPek*#^"q  
    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. QFMS]  
    Dim nameArray() As String, sampName As String gCmGFQE-f  
    nameArray = Split(fList(0)," 0-0.txt") }+z}vb  
    sampName  = nameArray(0) q;rU}hAzG0  
    Print "" LTxOq|/Cq  
    Print "Sample name: " & Chr(9) & sampName TWy1)30x  
l
1@:&j3h  
    'Open an output file and write the FRED header data IySlu^a  
    Dim outFile As String ,W.O*vC
A  
    outFile = cDir & sampName & "_FRED.txt" H]cCyuCdH  
    Open outFile For Output As #1 1UOFTI2S|  
    Print #1, "type bsdf_data" \o/oM,u  
    Print #1, "format angles=deg bsdf=value scale=1" hSxf;>(d  
'SC`->F4D  
    'Loop the file list, skip the two header lines and write the remaining data to file .NjOaK)\  
    Dim lineArray() As String, curLine As Long <3i!{"}  
    For Each curFile In fList )9}z^+TH  
        Print "Merging data from file " & curFile nF=h|rN  
        ReadFile( cDir & curFile, lineArray ) #6JG#!W  
        For curLine = 2 To UBound(lineArray) zDX-}t_'q  
            Print #1, lineArray(curLine) [xHK^JP 8F  
        Next tYnNOK*|  
    Next <|v]
9`'  
DwoO([&I  
    'Close the output file 'C(YUlT2?P  
    Close #1 86[TBX5'  
Jg@PhN<9  
    Print "Finished merging RPC data for sample " & sampName <=WQs2  
    Print "FRED formatted data file: " & Chr(9) & outFile 7uYJ_R  
End Sub Hg<]5  
%0L9)-R  
'Utility function to read the contents of a file into an array of strings. *edB3!!  
Function ReadFile(ByVal fileName As String, _ ^hU7QxW  
                  ByRef lineArray() As String) As Long v=!]t=P)t  
k5
((@[  
    ReadFile = -1 b?y3m +V`  
    Dim oFSO As Object  E;k'bz  
    Set oFSO = CreateObject("Scripting.FileSystemObject") Iu=iC.50}  
    Erase lineArray 1%H]2@  
`w2hJP  
    Dim fid As Long -FwOX~s/'  
    If oFSO.fileexists( fileName ) Then O0e6I&u:  
        fid = FreeFile()  IS!sJc  
        Open fileName For Input As fid
/aP`|&G,)  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) 4~D?F
'o  
        Close fid ~h -0rE  
    End If op;OPf,  
    Set oFSO = Nothing I U/gYFT  
    Return UBound( lineArray ) 8@Pv nOL  
S_WYU&8  
End Function p"w"/[8  
t=5K#SX}  
Sub GetFileList( ByVal in_dir As String, _ woQYP,  
                 ByRef in_flist() As String ) +[ !K  
IF<pT)  
    'Redimension the file list array UE5T%zd/  
    Erase in_flist 2ACN5lyUS  
}PD?x4  
    'Tracks how many files are found 
aH*)W'N?  
    Dim fCount As Long }!x\qpA  
    fCount = 0 A?=g!(wB  
Ovh[qm?Z  
    'Recurse directory and search for text files 3 cu`U`  
    Dim f As String W-2,QVp
%  
    f = Dir$(in_dir & "*.txt") a?_N8|k[  
    While f <> ""
]7eQ5[5s  
        ReDim Preserve in_flist(fCount) h,45-#+  
        in_flist(fCount) = f NZ7g}+GTG  
        fCount += 1 oIN!3  
        f = Dir$() b 'jZ4{+W  
    Wend ZG3u  
    ReDim Preserve in_flist(fCount-1) Z+x,Awq  
h@&&.S`B  
End Sub x[zt(kC0+  
,E<(K8  
'gI q_t|^  
QQ：2987619807 LY(YgqL