首页 -> 登录 -> 注册 -> 回复主题 -> 发表主题
光行天下 -> FRED,VirtualLab -> RPC Photonics扩散片BSDF [点此返回论坛查看本帖完整版本] [打印本页]

infotek 2020-12-15 09:37

RPC Photonics扩散片BSDF

摘要 E  K)7g~  
t@TBx=16  
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。
+d0&(b  
Ls#= R  
背景 rVx%"_'*-  
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。 EhkvC>y  
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。 SJRiMR_F~  
图1. RPC Photonics工程漫射体结构及光束投射形状
$vC!Us{z  
*.UM[Wo  
WdGjvs  
步骤 yE(>R(^  
 G.3 qg%  
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。 3JiJ,<,7  
Efm37Kv5l  
图2. RPC Photonics工程漫射体不同类型的散射数据
Z)6gh{B08  
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) G H N  
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 C w<bu|?  
例如下所示: o!`.LL%  
Sample name:  EDF-C1-56 .`OyC'  
Merging data from file EDF-C1-56 0-0.txt <m"yPi3TY  
Finished merging RPC data for sample EDF-C1-56  m/)Wn  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt 8,BNs5  
4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 /hPgOaB  
a. 创建一个新的散射库 .D^=vuxt~  
b. 散射模型命名 ;IC:]Zu  
c. 改变散射模型为“Tabulated BSDF”. $z!o&3c'x  
d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) 2t3'"8xJ  
e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 5G@z l  
f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, ]>NP?S )R  
g. 点击OK \$o!M1j  
5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 ]o <'T.x  
:" 9 :J  
pm+_s]s,  
脚本代码 5eI3a!E]O  
qm-G=EX  
'#Language "WWB-COM" _7(>0GY  
N 4$!V}pp  
Option Explicit _cqB p7  
jg]_'^pVzr  
Sub Main j$h.V#1z  
3%?01$k  
    'Cleanup lHBk&UN'  
    ClearOutputWindow() YN1P9j#0d  
KLW#+vZ  
    Print "Merging RPC Photonics BSDF Data Files" VC "66 \d&  
    SetTextColor(255,0,0) };[~>Mzl  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." @B;2z_Y!l  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." =.9L/74@  
    SetTextColor(0,0,0) #?)g?u%g=  
>=|Dir  
    'Current directory of this script (should be the same as the text files being merged) G992{B  
    Dim cDir As String wu5]S)?*  
    cDir = MacroDir$ & "\" =v-BzF15  
e_Na_l]  
    'Array which will be populated with the list of files to be merged COe"te  
    Dim fList() As String, curFile As String 0FrmZ$  
    GetFileList( cDir, fList ) _&TA|Da  
Zgt:ZO  
    Print "" /; ;_l2t  
    Print "Files found for merging:" 3okh'P%+  
    For Each curFile In fList ?\MvAG7Y  
        Print Chr(9) & curFile (9hCO-r  
    Next `9a %vN  
8X":,s!  
    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. JivkY"= F  
    Dim nameArray() As String, sampName As String .4c*  _$  
    nameArray = Split(fList(0)," 0-0.txt") 1 "'t5?XW  
    sampName  = nameArray(0) aqq7u5O1r  
    Print "" 3+mC96wN  
    Print "Sample name: " & Chr(9) & sampName )UA$."~O  
lP*_dt9  
    'Open an output file and write the FRED header data [5 Mt,skC:  
    Dim outFile As String o2e aSG  
    outFile = cDir & sampName & "_FRED.txt" ?-CZJr  
    Open outFile For Output As #1 zr~hGhfq  
    Print #1, "type bsdf_data" +cQGX5 K  
    Print #1, "format angles=deg bsdf=value scale=1" q_eGY&M  
)N`a4p  
    'Loop the file list, skip the two header lines and write the remaining data to file C8qA+dri  
    Dim lineArray() As String, curLine As Long Kh<xQ:eMy  
    For Each curFile In fList %n-:mSus  
        Print "Merging data from file " & curFile MP/6AAt7=|  
        ReadFile( cDir & curFile, lineArray ) (uV ~1  
        For curLine = 2 To UBound(lineArray) (q'w"qj  
            Print #1, lineArray(curLine) +]^6&MqO  
        Next KI~BjP\e  
    Next *RugVH4  
[)V&$~xW  
    'Close the output file N S*e<9  
    Close #1 7=yC*]BH-=  
=Nn&$h l  
    Print "Finished merging RPC data for sample " & sampName ]O'dwC  
    Print "FRED formatted data file: " & Chr(9) & outFile {2<A\nW  
End Sub nQ4s  
P6,~0v(S  
'Utility function to read the contents of a file into an array of strings. / /63?s+  
Function ReadFile(ByVal fileName As String, _ <fq?{z  
                  ByRef lineArray() As String) As Long ))"J  
R/8>^6  
    ReadFile = -1 40cgsRa|  
    Dim oFSO As Object |:_WdU"Q]  
    Set oFSO = CreateObject("Scripting.FileSystemObject") MxMrLiqU6l  
    Erase lineArray "L^Klk?Vn  
8 x$BbK  
    Dim fid As Long o:E+c_^q`  
    If oFSO.fileexists( fileName ) Then | k"?I  
        fid = FreeFile() Qhlgu!  
        Open fileName For Input As fid JBa( O- T  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) b~?FV>gl  
        Close fid >SO !{  
    End If ~e<l`rg#  
    Set oFSO = Nothing B WdR~|2  
    Return UBound( lineArray ) icW?a9b&  
KLpu7D5(|  
End Function 6.? Ke8iC  
L}O_1+b  
Sub GetFileList( ByVal in_dir As String, _ 49b#$Xq  
                 ByRef in_flist() As String ) My'u('Q%  
.>z)6S_G  
    'Redimension the file list array =!{7ZSu\  
    Erase in_flist \sB a  
]jNv}{  
    'Tracks how many files are found l \~w(8g<A  
    Dim fCount As Long r )8[LN-  
    fCount = 0 P/;sZo  
k.nq,  
    'Recurse directory and search for text files 'PW~4f/m  
    Dim f As String PLDg'4DMg  
    f = Dir$(in_dir & "*.txt") "&;>l<V  
    While f <> "" f\CJ |tKX  
        ReDim Preserve in_flist(fCount) ER0nrTlB<  
        in_flist(fCount) = f 7PG&G5  
        fCount += 1 #({0HFSC:j  
        f = Dir$() }3sj{:z{  
    Wend !yAlb#yu  
    ReDim Preserve in_flist(fCount-1) *FoH '\=  
*Dx&}"  
End Sub 1fBj21zG  
wc7gOrPpm  
LQ T^1|nq  
QQ:2987619807 w"Gci~]bXU  
查看本帖完整版本: [-- RPC Photonics扩散片BSDF --] [-- top --]

Copyright © 2005-2025 光行天下 蜀ICP备06003254号-1 网站统计