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infotek 2023-05-11 08:31

RPC Photonics扩散片BSDF

摘要 >EacXPt-O  
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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。
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背景 @zQ.d{  
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。 MAv-`8@|  
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。 ' F,.y6QU  
图1. RPC Photonics工程漫射体结构及光束投射形状
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步骤 UPE9e   
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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。 6d# 7  
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图2. RPC Photonics工程漫射体不同类型的散射数据
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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) @P'("qb~  
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 7o99@K,  
例如下所示: oe4r_EkYwW  
Sample name:  EDF-C1-56 6T`F'Fk[  
Merging data from file EDF-C1-56 0-0.txt 1Zr J7a7=  
Finished merging RPC data for sample EDF-C1-56 i".nnAI:  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt 5#WyI#YNG  
4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 KUE}^/%z  
a. 创建一个新的散射库 "p"M9P'  
b. 散射模型命名 3* v&6/K  
c. 改变散射模型为“Tabulated BSDF”. crDm2oA~t  
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 ) [( O*W  
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。 Eq YBT  
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, ((AsZ$[S  
g. 点击OK cns~)j~  
5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 _rN1(=J  
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脚本代码 -50 Nd=1  
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'#Language "WWB-COM" o4U[;.?c  
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Option Explicit Qt~QJJN?oF  
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Sub Main (Qp53g  
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    'Cleanup !RPPwvNk4  
    ClearOutputWindow() !A|ayYBb\  
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    Print "Merging RPC Photonics BSDF Data Files" P.t0o~hoK;  
    SetTextColor(255,0,0) hgU#2`fS  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." aGx[?}=  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." z]V%&f  
    SetTextColor(0,0,0) ]nQC  
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    'Current directory of this script (should be the same as the text files being merged) V|q`KOF  
    Dim cDir As String ,UA-Pq3 }  
    cDir = MacroDir$ & "\" uJ:SN;  
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    'Array which will be populated with the list of files to be merged gwQk M4  
    Dim fList() As String, curFile As String p+y2w{{  
    GetFileList( cDir, fList ) _yu_Ev}R  
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    Print "" WWtksi,  
    Print "Files found for merging:" M!#[(:  
    For Each curFile In fList TPi=!*$&  
        Print Chr(9) & curFile :&-j{8p-  
    Next |K11Woii  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. wF.S ,|  
    Dim nameArray() As String, sampName As String N NTUl$  
    nameArray = Split(fList(0)," 0-0.txt") {[tx^b  
    sampName  = nameArray(0) IPxK$nI^  
    Print "" `/+PZqdC  
    Print "Sample name: " & Chr(9) & sampName .CAcG"42  
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    'Open an output file and write the FRED header data F8En )#  
    Dim outFile As String  cq,8^o&  
    outFile = cDir & sampName & "_FRED.txt" us2RW<Oxv  
    Open outFile For Output As #1 :WM[[LOaC  
    Print #1, "type bsdf_data" .G/2CVMj  
    Print #1, "format angles=deg bsdf=value scale=1" /)LI1\ o  
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    'Loop the file list, skip the two header lines and write the remaining data to file ,2/y(JX}*!  
    Dim lineArray() As String, curLine As Long iI@m e=  
    For Each curFile In fList lE 09Y  
        Print "Merging data from file " & curFile t9Y?0O}/  
        ReadFile( cDir & curFile, lineArray ) a?gziCmS?C  
        For curLine = 2 To UBound(lineArray) TD"w@jBA  
            Print #1, lineArray(curLine) Y?b4* me  
        Next <7X6ULQ  
    Next ,K 1X/),  
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    'Close the output file mq!_/3  
    Close #1 xZ.c@u6:  
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    Print "Finished merging RPC data for sample " & sampName r!WXD9#  
    Print "FRED formatted data file: " & Chr(9) & outFile X{-[ E^X  
End Sub $9In\ x  
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'Utility function to read the contents of a file into an array of strings. - )brq3L  
Function ReadFile(ByVal fileName As String, _ /'WIgP  
                  ByRef lineArray() As String) As Long P{{U  
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    ReadFile = -1 |d0,54!  
    Dim oFSO As Object lWe1Q#  
    Set oFSO = CreateObject("Scripting.FileSystemObject") +~]:oj  
    Erase lineArray "<LVA2v;  
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    Dim fid As Long C?47v4n-'  
    If oFSO.fileexists( fileName ) Then TLC&@o :  
        fid = FreeFile() M>kk"tyM  
        Open fileName For Input As fid Rb=8(#  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) @!MhVNS_<  
        Close fid VfON{ 1g  
    End If ;+W9EbY2  
    Set oFSO = Nothing @ApX43U(  
    Return UBound( lineArray ) @2eV^eO9  
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End Function U 2@Mxw  
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Sub GetFileList( ByVal in_dir As String, _ kV$$GLD\  
                 ByRef in_flist() As String ) SGUu\yS&s  
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    'Redimension the file list array [WxRwE  
    Erase in_flist `E4OgO  
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    'Tracks how many files are found bo%v(  
    Dim fCount As Long ( /):  
    fCount = 0 Ag#o&Y  
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    'Recurse directory and search for text files v *UJ4r  
    Dim f As String RxZ#`$F  
    f = Dir$(in_dir & "*.txt") SF#Rc>v  
    While f <> "" YR$ )yl  
        ReDim Preserve in_flist(fCount) u>U4w68  
        in_flist(fCount) = f |DZ3=eWZ  
        fCount += 1 E 02l=M  
        f = Dir$() ! !9l@  
    Wend f}_d`?K  
    ReDim Preserve in_flist(fCount-1) v7kR]HU[y  
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End Sub vs|_l!n3  
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