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 & Y2xO  
>VX'`5r>uw  
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。
Z_ Y'#5o#  
nr,Z0  
背景 S2nX{=  
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。 ;y50t$0  
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。 !ab ef.%:  
图1. RPC Photonics工程漫射体结构及光束投射形状
HPJHA ,  
~P;A 9A(k  
;K%/s IIke  
步骤 gU NWM^n  
0r8Wv,7Bo  
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。 _mwt{D2r}  
~!cxRd5;F  
图2. RPC Photonics工程漫射体不同类型的散射数据
fGRV]6?V  
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) \k{[HfVvn  
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 n=AcN  
例如下所示: U~;tk@  
Sample name:  EDF-C1-56 ^H{YLO  
Merging data from file EDF-C1-56 0-0.txt $$"G1<EZ  
Finished merging RPC data for sample EDF-C1-56 &g1\0t  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt e?*Teb ?R  
4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 het<#3Bo  
a. 创建一个新的散射库 ?:-:m'jdU  
b. 散射模型命名 vLyazVj..  
c. 改变散射模型为“Tabulated BSDF”. GNq f  
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 ) Pz\K3-  
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。 .>P:{''  
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, sowwXrECg@  
g. 点击OK SW'eTG  
5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 o0|Ex\  
(Cfb8\~  
F"O\uo:3  
脚本代码 Pnm$g; `P  
X{OWDy  
'#Language "WWB-COM" 2lOUNxQ$  
jX(hBnGW  
Option Explicit n+te5_F  
K7K/P{@9[9  
Sub Main w>=N~0@t  
 0yq  
    'Cleanup w^$C\bCbh  
    ClearOutputWindow() `[U.BVP'  
x&0kIF'lq  
    Print "Merging RPC Photonics BSDF Data Files" 8T6NG!/  
    SetTextColor(255,0,0) 5g/,VMe  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." pt,L  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." ^2+ Vt=*  
    SetTextColor(0,0,0) 6$'*MpYF4  
k0K$OX*:e  
    'Current directory of this script (should be the same as the text files being merged) '?L^Fa_H  
    Dim cDir As String MGt>:&s(]  
    cDir = MacroDir$ & "\" UeLO`Ug0;  
EwA*  
    'Array which will be populated with the list of files to be merged oW 6Hufu+o  
    Dim fList() As String, curFile As String b/]4#?g  
    GetFileList( cDir, fList ) ,m5i(WL  
RLB"}&SF]  
    Print "" 31alQ\TH  
    Print "Files found for merging:" !]82$  
    For Each curFile In fList =\5WYC  
        Print Chr(9) & curFile Br 7q.  
    Next 3IlVSR^py  
C49\'1\6  
    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 9Ffam#  
    Dim nameArray() As String, sampName As String -OlrA{=c_  
    nameArray = Split(fList(0)," 0-0.txt") XGH:'^o_  
    sampName  = nameArray(0) h\w;SDwOk  
    Print "" RO,TNS~  
    Print "Sample name: " & Chr(9) & sampName 5~@-LXqL  
>19s:+  
    'Open an output file and write the FRED header data W/>a 1  
    Dim outFile As String \GxqE8  
    outFile = cDir & sampName & "_FRED.txt" o /[7Vo  
    Open outFile For Output As #1 ;M4[Liw~O  
    Print #1, "type bsdf_data" x]x3iFD  
    Print #1, "format angles=deg bsdf=value scale=1" /}8Au$nA  
Sq ]gU  
    'Loop the file list, skip the two header lines and write the remaining data to file >RkaFcq  
    Dim lineArray() As String, curLine As Long m{ !$_z8:  
    For Each curFile In fList ~1wt=Ln>  
        Print "Merging data from file " & curFile w|s2f`!  
        ReadFile( cDir & curFile, lineArray ) : #CWiq("%  
        For curLine = 2 To UBound(lineArray) Pg(Y}Tu  
            Print #1, lineArray(curLine) ,#3Aaw   
        Next <KU 0K  
    Next ION o&~-l  
8xgBNQdPT  
    'Close the output file  Jc ze.t  
    Close #1 'WP~-}(  
#xGP|:m  
    Print "Finished merging RPC data for sample " & sampName WX?nq'nr  
    Print "FRED formatted data file: " & Chr(9) & outFile 1bCE~,tD  
End Sub KYm8|]'g  
Jj>Rzj!m  
'Utility function to read the contents of a file into an array of strings. uhfK\.3  
Function ReadFile(ByVal fileName As String, _ D5P-$1KPt  
                  ByRef lineArray() As String) As Long 9u{[e"  
|kPgXq6  
    ReadFile = -1 jsE8=zZs  
    Dim oFSO As Object E2>{ seZ  
    Set oFSO = CreateObject("Scripting.FileSystemObject") _.; PLq~0  
    Erase lineArray GEc-<`-  
18rV Acj  
    Dim fid As Long ="& GU%$  
    If oFSO.fileexists( fileName ) Then !<:Cd(bM  
        fid = FreeFile() KJec/qca  
        Open fileName For Input As fid [#uhMn^  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) s_NY#MPz[  
        Close fid `J,>#Y6(J  
    End If ^7aqe*|vm  
    Set oFSO = Nothing `~)?OTzU#  
    Return UBound( lineArray ) q=5aHH% |  
<|_>r`@%l  
End Function aj;x:UqpJ  
IdAh)#) 7  
Sub GetFileList( ByVal in_dir As String, _ D r(0w{5  
                 ByRef in_flist() As String ) e3SnC:OWf  
{. 9BG&  
    'Redimension the file list array lOVcXAe}  
    Erase in_flist {im?tZ,  
mc?IM(t  
    'Tracks how many files are found O^8ZnN_+  
    Dim fCount As Long ^t4^gcoZ4Z  
    fCount = 0 #U`AK9rP_g  
k+ t(u]  
    'Recurse directory and search for text files $TXiWW+  
    Dim f As String LP#wE~K"b  
    f = Dir$(in_dir & "*.txt") jSE)&K4nI  
    While f <> "" 3(V0,L'1  
        ReDim Preserve in_flist(fCount) ZDmL?mC  
        in_flist(fCount) = f zni9  
        fCount += 1 +=E\sEe  
        f = Dir$() D8L5t<^1R  
    Wend j_so s%-  
    ReDim Preserve in_flist(fCount-1) ,@f"WrQ  
Y`j$7!j  
End Sub N E9,kWI  
vEg%ivj3  
s oY\6mHio  
QQ:2987619807 i0{\c}r:4b  
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