[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： ;Bne=vjQp  
w)"F=33}5  
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。 QzV%m0  
F|?}r3{aJ  
背景： Vu Ey`c  
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。 SBamgc  
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。 Gn 1  
256V xn  
a*!9RQ  

9K=K,6 b  
步骤 gmtS3,  
M8f[ck  
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。 8k?V&J
`  
\r-v]]_<d  
Ny]]L  
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） M~g@y$  
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 ^6PKSEba  
例如下所示： E^x/v_,$w!  
Sample name:  EDF-C1-56 >9X+\eg-  
Merging data from file EDF-C1-56 0-0.txt ZKVM9ofXRi  
Finished merging RPC data for sample EDF-C1-56 -5,+gakSk  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt [.nkNda5)v  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 OTmr-l6  
a. 创建一个新的散射库 8hZc#b;  
b. 散射模型命名 <|VV8r93  
c. 改变散射模型为“Tabulated BSDF”. 5$
/Me=g<  
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 ） @Qd5a(5WM  
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。 -z>m]YDH  
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， cp4~`X  
g. 点击OK a0hgF_O1  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 q`L}\}o  
MG3xX;  
S vW{1  
脚本代码： "tmr s_~  
+jj] tJ$[  
'#Language "WWB-COM" g\@zQ^O?  
N7Kk
z /  
Option Explicit /B5rWJ2AS  
+A2}@k  
Sub Main phy:G
}F6%  
z#+Sf.  
    'Cleanup $A>]lLo0  
    ClearOutputWindow() k j&hn  
&}VVr
  
    Print "Merging RPC Photonics BSDF Data Files" ?n
D]p!  
    SetTextColor(255,0,0) dSbz$Fct  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." ^aY,Wq  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." p}q]G
J  
    SetTextColor(0,0,0) hIwqSKq9  
8!7`F.BX  
    'Current directory of this script (should be the same as the text files being merged) ^6 \@$  
    Dim cDir As String f&C]}P  
    cDir = MacroDir$ & "\" TR!7@Mu3  
G
X%r-  
    'Array which will be populated with the list of files to be merged 2jyxP6t  
    Dim fList() As String, curFile As String {$v>3FG  
    GetFileList( cDir, fList ) q(}
#{OO  
3s_$.  
    Print "" H@`lM~T[  
    Print "Files found for merging:" 1#nY Z%  
    For Each curFile In fList 9+:<RFJ  
        Print Chr(9) & curFile w,zm!  
    Next FyRr/0C>  
'PdUSv|lH  
    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. ='<*mT<  
    Dim nameArray() As String, sampName As String >!#or- C  
    nameArray = Split(fList(0)," 0-0.txt") Q$~_'I7~Mz  
    sampName  = nameArray(0) }dG>_/3  
    Print "" $H1igYc  
    Print "Sample name: " & Chr(9) & sampName Tnb5tHjnh  
X/23 /_~L`  
    'Open an output file and write the FRED header data &u~%5
;  
    Dim outFile As String xWKUti i  
    outFile = cDir & sampName & "_FRED.txt"
>@q4Uez  
    Open outFile For Output As #1 Z+Ppd=||,  
    Print #1, "type bsdf_data" uar[D|DcD"  
    Print #1, "format angles=deg bsdf=value scale=1" ~0Mw\p%}  
JO\KTWtjO  
    'Loop the file list, skip the two header lines and write the remaining data to file ilFS9A3P  
    Dim lineArray() As String, curLine As Long T_~xDQ`v  
    For Each curFile In fList P.O/ZW>g  
        Print "Merging data from file " & curFile N-}|!pqb  
        ReadFile( cDir & curFile, lineArray ) Z^GXKOeq  
        For curLine = 2 To UBound(lineArray) ':|?M B  
            Print #1, lineArray(curLine) J24H}^~na  
        Next !-q)9K?  
    Next hr/|Fn+kA  
iI!g1  
    'Close the output file ib~EQ?u{  
    Close #1 \$2zF8  
6('xIE(R  
    Print "Finished merging RPC data for sample " & sampName IdciGS6t  
    Print "FRED formatted data file: " & Chr(9) & outFile Z4tc3e  
End Sub 8PvO_Gz5  
K2-nP2Go?  
'Utility function to read the contents of a file into an array of strings. );fPir?+  
Function ReadFile(ByVal fileName As String, _ j4Y] 8  
                  ByRef lineArray() As String) As Long  A}n7A   
qim|=  
    ReadFile = -1 )|<g\>/  
    Dim oFSO As Object Fzn#>`qG  
    Set oFSO = CreateObject("Scripting.FileSystemObject") KZwzQ"Hl  
    Erase lineArray 'jBtBFzP-  
_H$Z}2g<z  
    Dim fid As Long [I%'\CI;  
    If oFSO.fileexists( fileName ) Then ,pVq/1  
        fid = FreeFile() #oEq)Vq>g|  
        Open fileName For Input As fid aN~x3G  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) n16TQe"8  
        Close fid i|G /x  
    End If YPS,[F'B.  
    Set oFSO = Nothing \`WAG>'l5  
    Return UBound( lineArray ) 1DM$FG_Z-  
<W88;d33r=  
End Function u&$1XZ!es  
n_-k <
3  
Sub GetFileList( ByVal in_dir As String, _ -(|}:J  
                 ByRef in_flist() As String ) |~YhN'OJ  
t}Kz
h`  
    'Redimension the file list array dhI+_z   
    Erase in_flist 8'Q1'yc  
qN6
GLx%  
    'Tracks how many files are found ~,reS:9RZ  
    Dim fCount As Long bv'Z~@<c  
    fCount = 0 9XW[NY#)#  
Ui;PmwQc&  
    'Recurse directory and search for text files K]dX5vJw'  
    Dim f As String ,4kipJ!,yK  
    f = Dir$(in_dir & "*.txt") kl9<l*  
    While f <> "" rYk   
        ReDim Preserve in_flist(fCount) q'<K$4_,%  
        in_flist(fCount) = f ]\oE}7K%r  
        fCount += 1 "aeKrMgc6V  
        f = Dir$() d15E$?ZLH  
    Wend r;OE6}L>  
    ReDim Preserve in_flist(fCount-1) /lN09j  
cUM#|K#6  
End Sub F` ]s  
9Q*zf@w  
btIh%OM  
QQ：2987619807 QD*(wj