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 cH$zDm1  
"$)Nd+ny  
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。
) xRm  
&n:3n  
背景 `<R;^qCt  
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。 ~~J xw ]  
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。 G55-{y9Q  
图1. RPC Photonics工程漫射体结构及光束投射形状
;O8Uc&:P  
c*0pF=3  
SCbN(OBN!  
步骤 8NY $Iw  
;Y:_}kN8_  
1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 j9)WInYc:  
%3v:c|r  
图2. RPC Photonics工程漫射体不同类型的散射数据
&S\q*H=}i  
2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) b-sbRR  
3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 Sw##C l#  
例如下所示: ^A9D;e6!-  
Sample name:  EDF-C1-56 ^a9v5hu  
Merging data from file EDF-C1-56 0-0.txt X6_m&~}15  
Finished merging RPC data for sample EDF-C1-56 Q_p!;3  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt UsT+o  
4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 H)XHlO^  
a. 创建一个新的散射库 \etuIFQ#U  
b. 散射模型命名 "T>74bj_|Q  
c. 改变散射模型为“Tabulated BSDF”. ^T}6o Ud  
d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) Q)"L8v v  
e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 ~(%TQY5  
f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, y\}39Z(]  
g. 点击OK A0L&p(i  
5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 f? sW^ d;  
z$'_ =9yZ  
^1d"Rqtv  
脚本代码 6.]x@=Wm  
T<!&6,N A  
'#Language "WWB-COM" I]S8:w![  
Fi8'3/q-^  
Option Explicit Z1V%pg>]*  
FcR(uv<  
Sub Main -8- BVU  
KEfn$\  
    'Cleanup oBVYgv)  
    ClearOutputWindow() EH;w <LvT  
CuE>=y- "I  
    Print "Merging RPC Photonics BSDF Data Files" _J<^'w^;%  
    SetTextColor(255,0,0) Vq)6+n8o  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." GWs[a$|  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." -49z.(@ki  
    SetTextColor(0,0,0) n}8J-/(|+  
y1DP`Ro  
    'Current directory of this script (should be the same as the text files being merged) 7 S^iGe  
    Dim cDir As String n<C4-'^U[a  
    cDir = MacroDir$ & "\" 9Q 4m9}  
b >R/=tx  
    'Array which will be populated with the list of files to be merged c*+yJNm3>  
    Dim fList() As String, curFile As String 76i)m!  
    GetFileList( cDir, fList ) zB6u%uWR  
.r~!d|  
    Print "" I`%\ "bF@  
    Print "Files found for merging:" !P*1^8b`f  
    For Each curFile In fList mp2J|!Lx  
        Print Chr(9) & curFile vR m.# +Td  
    Next EC6&#)g;CO  
>UTAk  
    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. h-rPLU;Bw  
    Dim nameArray() As String, sampName As String x Bn+-V  
    nameArray = Split(fList(0)," 0-0.txt") n[zP}YRr  
    sampName  = nameArray(0) Fv n:V\eb  
    Print "" 9Vp|a&Ana  
    Print "Sample name: " & Chr(9) & sampName /rsr|`#  
L,Jl# S  
    'Open an output file and write the FRED header data PCl@Ff  
    Dim outFile As String }{Y)[w#R  
    outFile = cDir & sampName & "_FRED.txt" LqnN5l@ _B  
    Open outFile For Output As #1 ?2ZggV  
    Print #1, "type bsdf_data" o XA3 i  
    Print #1, "format angles=deg bsdf=value scale=1" =3rPE"@,[  
q$vATT  
    'Loop the file list, skip the two header lines and write the remaining data to file kz]vXJ  
    Dim lineArray() As String, curLine As Long qTK\'trgx]  
    For Each curFile In fList _= RA-qZ"  
        Print "Merging data from file " & curFile x\qS|q\N  
        ReadFile( cDir & curFile, lineArray ) nZ?BC O  
        For curLine = 2 To UBound(lineArray) e|:#Y^  
            Print #1, lineArray(curLine) vywd&7gK  
        Next # 4E@y<l$  
    Next Z5aU7  
5m,{?M`  
    'Close the output file y74Ph:^ k  
    Close #1 Y40Hcc+Fx  
7_r$zEP6  
    Print "Finished merging RPC data for sample " & sampName -^=sxi,V  
    Print "FRED formatted data file: " & Chr(9) & outFile 0T,Qn{  
End Sub ZM oV!lu  
rM6^pzxe  
'Utility function to read the contents of a file into an array of strings. /s.O3x._'  
Function ReadFile(ByVal fileName As String, _ ODn6%fp%  
                  ByRef lineArray() As String) As Long JZ6{W  
+5pK[%k  
    ReadFile = -1 %AbA(F  
    Dim oFSO As Object /60 `"xH  
    Set oFSO = CreateObject("Scripting.FileSystemObject") d%l_:M3  
    Erase lineArray +W+O7SK\y  
@-dM'R6C  
    Dim fid As Long  /1-  
    If oFSO.fileexists( fileName ) Then X E]YKJ?|k  
        fid = FreeFile() k 8^!5n  
        Open fileName For Input As fid 5p6Kq=jhb  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) et";*EZJX  
        Close fid +(/?$dRH  
    End If ND[u$N+5x"  
    Set oFSO = Nothing 3ThCY`  
    Return UBound( lineArray ) iq$edq[  
&.ZW1TxE8  
End Function G5W6P7-<X  
*<*{gO?Q4  
Sub GetFileList( ByVal in_dir As String, _ -|^}~yOx0=  
                 ByRef in_flist() As String ) usiv`.  
M0`nr}g  
    'Redimension the file list array }^uUw&   
    Erase in_flist d=%:rLm$  
Y(IT#x?p  
    'Tracks how many files are found Q+|8|V}w  
    Dim fCount As Long eUvIO+av  
    fCount = 0 LO@.aJpp  
!xoN%5 !  
    'Recurse directory and search for text files Ws?BAfP  
    Dim f As String kYBTmz} z  
    f = Dir$(in_dir & "*.txt") NVx`'Il8 "  
    While f <> "" ?(GMe>  
        ReDim Preserve in_flist(fCount) 7kU:91zR  
        in_flist(fCount) = f l c)*HYqU  
        fCount += 1 <)y44x|S'  
        f = Dir$() \&\_[y8U  
    Wend q q}EXq^  
    ReDim Preserve in_flist(fCount-1) !}wJ+R ^2  
K7}EL|Kx  
End Sub KN U/Kc#  
evf){XhT;n  
9 v)p0  
QQ:2987619807 V^aX^;  
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