首页 -> 登录 -> 注册 -> 回复主题 -> 发表主题
光行天下 -> 讯技光电&黉论教育 -> 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 2023-05-11 08:31

RPC Photonics扩散片BSDF

摘要 |P si?'4  
2WRa@;Tj  
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。
{]/}3t  
{f\/2k3  
背景 _>8ZL)NQQ  
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。 ^b]h4z$  
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。 c-L1 Bkw  
图1. RPC Photonics工程漫射体结构及光束投射形状
)Fh+6  
/[iqga=  
YzqUOMAt"V  
步骤 ]4m;NId  
Ccld;c&+  
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。 T\VKNEBo  
-rSp gk0wL  
图2. RPC Photonics工程漫射体不同类型的散射数据
?H\K];  
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) ) N*,cTE  
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 gwj+~vSfi  
例如下所示: YQWGv,47\  
Sample name:  EDF-C1-56 v&p|9C@  
Merging data from file EDF-C1-56 0-0.txt /*)zQ?N  
Finished merging RPC data for sample EDF-C1-56 -s5j^U{h|  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt J|-X?V;ZW  
4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 t%$>  
a. 创建一个新的散射库 ]3xb Q1  
b. 散射模型命名 A{Jp>15AVg  
c. 改变散射模型为“Tabulated BSDF”. )a ov]Ns  
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 ) iYi3x_A`  
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。 |N%?7PZ(  
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, Em?Z  
g. 点击OK h\#\hx  
5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 slC 38  
@kCFc}  
:C*7 DS  
脚本代码 &eL02:[  
1 PL2[_2:  
'#Language "WWB-COM" o}q>oa b z  
=]k0*\PS  
Option Explicit q#RUL!WF7U  
N?Byp&rqI<  
Sub Main V(hM@ztN  
=P}ob eY  
    'Cleanup >/@wht4- j  
    ClearOutputWindow() _Mi`]VSq9  
ZG29q>  
    Print "Merging RPC Photonics BSDF Data Files" ^O#>LbM"x  
    SetTextColor(255,0,0) a<c]N:1  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." $T.u Iq  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." 37OU  
    SetTextColor(0,0,0) 5G$N  
{k CCpU  
    'Current directory of this script (should be the same as the text files being merged) hk6(y?#  
    Dim cDir As String @d&(*9Y  
    cDir = MacroDir$ & "\" =lB +GS%  
)ry7a .39b  
    'Array which will be populated with the list of files to be merged aQjs5RbP~  
    Dim fList() As String, curFile As String ?A4zIJ\  
    GetFileList( cDir, fList ) S T#9auw  
[{iPosQWj  
    Print "" -|K^!G  
    Print "Files found for merging:" bTBV:]w  
    For Each curFile In fList %.k~L  
        Print Chr(9) & curFile ?4k/V6n@y  
    Next lZ5LHUzP  
j<"@ Y7  
    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 9:DT+^BB  
    Dim nameArray() As String, sampName As String LxdF;JCz:  
    nameArray = Split(fList(0)," 0-0.txt") JVfSmxy.  
    sampName  = nameArray(0) S2y_5XJ<D  
    Print "" s fD@lW3  
    Print "Sample name: " & Chr(9) & sampName 0d>|2QV   
#)}K,FDd  
    'Open an output file and write the FRED header data N>pTl$\4  
    Dim outFile As String v2w|?26Lf  
    outFile = cDir & sampName & "_FRED.txt" (,nQ7,2EX  
    Open outFile For Output As #1 5 [GdFd>{  
    Print #1, "type bsdf_data" %mqep5n(  
    Print #1, "format angles=deg bsdf=value scale=1" zR@4Z>6   
]A? (OA  
    'Loop the file list, skip the two header lines and write the remaining data to file M Ewa^  
    Dim lineArray() As String, curLine As Long nXU`^<nA  
    For Each curFile In fList -!@]z2uU  
        Print "Merging data from file " & curFile 6!39t  
        ReadFile( cDir & curFile, lineArray ) k|hy_? *  
        For curLine = 2 To UBound(lineArray) "A( D}~i  
            Print #1, lineArray(curLine) lJHU1 gu  
        Next h(~@ n d{  
    Next 1tZ7%0R\g]  
'c7'iDM  
    'Close the output file NqlU?  
    Close #1 6o:b(v&Oo  
 !n`9V^`  
    Print "Finished merging RPC data for sample " & sampName "?*B2*|}`  
    Print "FRED formatted data file: " & Chr(9) & outFile h5)4Z^n  
End Sub AU$<W"%R  
eoj(zY3  
'Utility function to read the contents of a file into an array of strings. q1^bH 6*fl  
Function ReadFile(ByVal fileName As String, _ tZXq<k9  
                  ByRef lineArray() As String) As Long wiFA 3_\G  
*P01 yW0  
    ReadFile = -1 MZrLLnl6\  
    Dim oFSO As Object u Vth&4dh9  
    Set oFSO = CreateObject("Scripting.FileSystemObject") "F[e~S#V*  
    Erase lineArray @ ^q}.u`  
E8/Pi>QW  
    Dim fid As Long 9^?2{aP%  
    If oFSO.fileexists( fileName ) Then >rhqhmh;W"  
        fid = FreeFile() /$\N_`bM  
        Open fileName For Input As fid <@S'vcO  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) <B Vx%  
        Close fid 7VIfRN{5n  
    End If u?4d<%5R!  
    Set oFSO = Nothing ]\1H=g%Ou  
    Return UBound( lineArray ) x'v-]C(@  
|4C5;"Pc  
End Function Z!+n/ D-1  
{_G_YL[  
Sub GetFileList( ByVal in_dir As String, _ )%JjV(:  
                 ByRef in_flist() As String ) Q<Q?#v7NX  
'WNq/z"X  
    'Redimension the file list array v8"Zru  
    Erase in_flist &s8vmUt  
03n+kh  
    'Tracks how many files are found Ow N~-).%-  
    Dim fCount As Long *kt|CXxAS8  
    fCount = 0 =TGa\iclpB  
/pC60y}O0  
    'Recurse directory and search for text files v =_Ds<6n  
    Dim f As String (kVxa8 0  
    f = Dir$(in_dir & "*.txt") yRivf.wH  
    While f <> "" ~}_S]^br  
        ReDim Preserve in_flist(fCount) U6F7dT  
        in_flist(fCount) = f d" =)=hm!  
        fCount += 1 l h?[wc  
        f = Dir$() 0Of6$`  
    Wend F]L96&  
    ReDim Preserve in_flist(fCount-1) % kaV ?j  
RGLJaEl !  
End Sub L=@8Z i!2<  
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