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infotek 2023-05-11 08:31

RPC Photonics扩散片BSDF

摘要 _<6E>"*m  
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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 ]pWn%aGv*Y  
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。 W %1/: _  
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。 _oHxpeM  
图1. RPC Photonics工程漫射体结构及光束投射形状
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步骤 m f\tMik<  
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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。 ^KJi |'B  
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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) ?L|Ai\|  
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 x21XzGLY|}  
例如下所示: x9o(q`N  
Sample name:  EDF-C1-56 o]eG+i6g]  
Merging data from file EDF-C1-56 0-0.txt [1l OGck[  
Finished merging RPC data for sample EDF-C1-56 k*r G^imX  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt dbg%n 0h  
4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 Jim5Ul  
a. 创建一个新的散射库 t9.| i H  
b. 散射模型命名 p@?ud%  
c. 改变散射模型为“Tabulated BSDF”. Uuktq)NU  
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 ) :7*9W|e  
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。 ,ZZ5A;)  
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, sD9OV6^{?K  
g. 点击OK WQ9VcCY  
5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 6H!l>@a7v  
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脚本代码 \"X_zM  
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'#Language "WWB-COM" JF'<""  
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Option Explicit gX`C76P!  
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Sub Main 8yybZ@  
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    'Cleanup FzF#V=9lP  
    ClearOutputWindow() hb(H-`16  
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    Print "Merging RPC Photonics BSDF Data Files" TCK#bJ  
    SetTextColor(255,0,0) 4YXp,U  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." hP_{$c{4:g  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." #@ F   
    SetTextColor(0,0,0) F5+!Gb En  
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    'Current directory of this script (should be the same as the text files being merged) d>0 j!+s  
    Dim cDir As String @P">4xVX{  
    cDir = MacroDir$ & "\" A~;.9{6J[t  
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    'Array which will be populated with the list of files to be merged \SBAk h  
    Dim fList() As String, curFile As String /PpZ6ne~ [  
    GetFileList( cDir, fList ) H{uR+&<  
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    Print "" 16"L;r  
    Print "Files found for merging:" r@Xh8 r;  
    For Each curFile In fList Gb.}af#v  
        Print Chr(9) & curFile R8|F qBs  
    Next \*#E4`Y  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. LAGg(:3f3  
    Dim nameArray() As String, sampName As String 4rypT-%^;  
    nameArray = Split(fList(0)," 0-0.txt") n>YgL}YZ?  
    sampName  = nameArray(0) 6Z-[-0o+g  
    Print "" -AXMT3p=1  
    Print "Sample name: " & Chr(9) & sampName ig'4DmNC  
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    'Open an output file and write the FRED header data BQ {'r^u  
    Dim outFile As String D7C%Y^K]>E  
    outFile = cDir & sampName & "_FRED.txt" 7??j}ob>  
    Open outFile For Output As #1 mFyYn,Mu|  
    Print #1, "type bsdf_data" 9abn6S(XpJ  
    Print #1, "format angles=deg bsdf=value scale=1" _<jccQ  
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    'Loop the file list, skip the two header lines and write the remaining data to file nz`"f,  
    Dim lineArray() As String, curLine As Long u73/#!(1=H  
    For Each curFile In fList % %QAC4  
        Print "Merging data from file " & curFile HqA3.<=F,  
        ReadFile( cDir & curFile, lineArray ) t`0(5v  
        For curLine = 2 To UBound(lineArray) PU%WpI.w  
            Print #1, lineArray(curLine) aIE\B4w  
        Next `4"&_ltD  
    Next tmC9p6%  
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    'Close the output file 9z(h8H  
    Close #1 |bmc6G[  
DO? bJ01  
    Print "Finished merging RPC data for sample " & sampName u_S>`I  
    Print "FRED formatted data file: " & Chr(9) & outFile @TnAO8Q>XD  
End Sub _1?Fy u&<5  
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'Utility function to read the contents of a file into an array of strings. !B&1{  
Function ReadFile(ByVal fileName As String, _ }q~xr3#  
                  ByRef lineArray() As String) As Long [oS.B\Vc  
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    ReadFile = -1 XXZ$^W&  
    Dim oFSO As Object +isaqfy/  
    Set oFSO = CreateObject("Scripting.FileSystemObject") i{ 2rQy+  
    Erase lineArray 7033#@_  
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    Dim fid As Long O[#B906JB  
    If oFSO.fileexists( fileName ) Then :aMp,DfM]P  
        fid = FreeFile() 0}aw9g  
        Open fileName For Input As fid hH@pA:`s  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) Dz&<6#L<  
        Close fid Hy1f,D  
    End If )IZ~!N|-w  
    Set oFSO = Nothing veGRwir  
    Return UBound( lineArray ) ZBfB4<M9xS  
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End Function -\=kd {*B  
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Sub GetFileList( ByVal in_dir As String, _ >a1 ovKF  
                 ByRef in_flist() As String ) +Pm }_"GU  
} g[(h=Qi  
    'Redimension the file list array  W,)qE^+  
    Erase in_flist Oo 95\Yf$N  
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    'Tracks how many files are found j*;/Cah]k  
    Dim fCount As Long g3uI1]QXLg  
    fCount = 0 3:WXrOl  
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    'Recurse directory and search for text files jP|(y]!  
    Dim f As String GPnSdGLC  
    f = Dir$(in_dir & "*.txt") Cdd +I5~  
    While f <> ""  ~WG#Zci-  
        ReDim Preserve in_flist(fCount) K-*q3oh G  
        in_flist(fCount) = f !'EE8Tp~F  
        fCount += 1 L1E\^)  
        f = Dir$() 4d0<uB&v'  
    Wend 0UT2sM$  
    ReDim Preserve in_flist(fCount-1) nANoy6z:  
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End Sub f<0nj?  
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