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infotek 2021-10-26 09:58

RPC Photonics扩散片BSDF

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RPC Photonics扩散片BSDF
时间:2016-01-08 23:10来源:讯技光电作者: 技术部点击:次打印
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摘要 {p.^E5&  
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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。 e%s1D  
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背景 /!?b&N/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。 EXMW,  
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。
图1. RPC Photonics工程漫射体结构及光束投射形状
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步骤 <Drm#2x!E  
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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。 i?ZVVE=r  
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) f&j\gYWq  
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 D6~KLSKm  
例如下所示: }uNj#Uf  
Sample name:  EDF-C1-56 denxcDFu/~  
Merging data from file EDF-C1-56 0-0.txt o}DR p4;Ka  
Finished merging RPC data for sample EDF-C1-56 mPU}]1*p  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt n }b{u@$  
4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面
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a. 创建一个新的散射库 3?K+wg s  
b. 散射模型命名 uH?dy55 Y  
c. 改变散射模型为“Tabulated BSDF”. ,hH c -%-  
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 ) N5{v;~Cm}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。 j!@T@ 8J  
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, ny{S&f  
g. 点击OK -RJ~Sky[  
5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 >?1GJ5]\s  
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脚本代码 ~5&B#Sm[G  
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'#Language "WWB-COM" L[ZS17 ;*  
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Option Explicit ~n8UN<  
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Sub Main je@&|9h  
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    'Cleanup >|, <9z`D  
    ClearOutputWindow() oKYa ?  
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    Print "Merging RPC Photonics BSDF Data Files" <o9AjASv\,  
    SetTextColor(255,0,0) [ :)F-  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." ~r?tFE* +  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." bfpeK>T  
    SetTextColor(0,0,0) kQe<a1 8  
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    'Current directory of this script (should be the same as the text files being merged) @D=B5f@(o  
    Dim cDir As String w+"E{#N  
    cDir = MacroDir$ & "\" Gk+R, :  
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    'Array which will be populated with the list of files to be merged z{&Av  
    Dim fList() As String, curFile As String SHs [te[  
    GetFileList( cDir, fList ) OwEV$Q  
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    Print "" n-2!<`UFX  
    Print "Files found for merging:" DLP@?]BBOA  
    For Each curFile In fList akk*f+TD`  
        Print Chr(9) & curFile Vpp$yM&?  
    Next W4$aX5ow$  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 45n.%*,  
    Dim nameArray() As String, sampName As String za}Kd^KeB  
    nameArray = Split(fList(0)," 0-0.txt") Zn JJ-zP  
    sampName  = nameArray(0) -<k)|]8  
    Print "" H>D sAHS  
    Print "Sample name: " & Chr(9) & sampName 34X]b[^  
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    'Open an output file and write the FRED header data t\LE\[XM>  
    Dim outFile As String [L7s(Zs>  
    outFile = cDir & sampName & "_FRED.txt" QVRQUd  
    Open outFile For Output As #1 W!T[ ^+  
    Print #1, "type bsdf_data" )Nx*T9!Q  
    Print #1, "format angles=deg bsdf=value scale=1" "!(@MfjT  
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    'Loop the file list, skip the two header lines and write the remaining data to file ViyG%Sm  
    Dim lineArray() As String, curLine As Long =$+0p3[r  
    For Each curFile In fList "9d Z z/{  
        Print "Merging data from file " & curFile ;hODzfNkS  
        ReadFile( cDir & curFile, lineArray ) y`8U0TE3R  
        For curLine = 2 To UBound(lineArray) *z6A ~U  
            Print #1, lineArray(curLine) $[b}r#P  
        Next QHja4/  
    Next L~e0^X?  
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    'Close the output file )7!,_r  
    Close #1 !~RK2d  
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    Print "Finished merging RPC data for sample " & sampName c%O97J.5b  
    Print "FRED formatted data file: " & Chr(9) & outFile @YRy)+  
End Sub 5D=U.UdR  
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'Utility function to read the contents of a file into an array of strings. k%u fgHl!  
Function ReadFile(ByVal fileName As String, _ uH? 4d!G  
                  ByRef lineArray() As String) As Long ctHQZ#.[(  
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    ReadFile = -1 = 03G~7B>  
    Dim oFSO As Object 1u5^a^O(|  
    Set oFSO = CreateObject("Scripting.FileSystemObject") nC !NZ  
    Erase lineArray 7p\&D?  
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    Dim fid As Long ]l h=ZC  
    If oFSO.fileexists( fileName ) Then qc.TYp  
        fid = FreeFile() rQNm2h  
        Open fileName For Input As fid & ^1 b]f  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) 9=6BQ`u  
        Close fid z>0$SBQ-  
    End If tS\Db'C7  
    Set oFSO = Nothing pYm#iz  
    Return UBound( lineArray ) ReD]M@;  
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End Function 5M9o(Z\AF  
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Sub GetFileList( ByVal in_dir As String, _ h+!R)q8M  
                 ByRef in_flist() As String ) G9xO>Xp^Al  
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    'Redimension the file list array 6Y6t.j0vN.  
    Erase in_flist gBWr)R  
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    'Tracks how many files are found <Piq?&VX[  
    Dim fCount As Long 4_CL1g  
    fCount = 0 [-"ZuUG  
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    'Recurse directory and search for text files 8 "NPj0  
    Dim f As String k^ fW /  
    f = Dir$(in_dir & "*.txt") 3?`TEw~'  
    While f <> "" % jf|efxo  
        ReDim Preserve in_flist(fCount) W`oyDg,D  
        in_flist(fCount) = f ToKG;Ff4b  
        fCount += 1 o(> #}[N}  
        f = Dir$() wpC .!T  
    Wend ts_|7Ev  
    ReDim Preserve in_flist(fCount-1)

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