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infotek 2020-12-15 09:37

RPC Photonics扩散片BSDF

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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 J<*Mk  
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。 :tG".z  
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。 ;H r@0f  
图1. RPC Photonics工程漫射体结构及光束投射形状
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步骤 }t-|^mY>  
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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。 0_pwY=P  
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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) c qyh#uWe  
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 ^ED>{UiNI  
例如下所示: >t }D5ah  
Sample name:  EDF-C1-56 x2wWp-Z  
Merging data from file EDF-C1-56 0-0.txt [eP]8G\ W  
Finished merging RPC data for sample EDF-C1-56 km^+ mK  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt V\hct$ 7Vm  
4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 s? #lhI  
a. 创建一个新的散射库 9d}nyJ  
b. 散射模型命名 )9Ojvp=#r:  
c. 改变散射模型为“Tabulated BSDF”. DkKD~  
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 ) kDa#yN\  
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。 )II,HT-LY  
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, {/!Gh\i  
g. 点击OK <ijmkNVS  
5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 R0d|j#vP  
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脚本代码 P`9A?aG.Z  
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'#Language "WWB-COM" YDD]n*&  
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Option Explicit 8E%*o  
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Sub Main io3'h:+9s  
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    'Cleanup tb\pjLB][  
    ClearOutputWindow() JCfToFB  
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    Print "Merging RPC Photonics BSDF Data Files" =ApT#*D)o  
    SetTextColor(255,0,0) dD<kNa}2  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." rP4@K%F9jB  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." lM,:c.R  
    SetTextColor(0,0,0) ]#.#]}=  
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    'Current directory of this script (should be the same as the text files being merged) nCB3d[/B  
    Dim cDir As String qJj5J;k  
    cDir = MacroDir$ & "\" )~(_[='  
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    'Array which will be populated with the list of files to be merged o]U ==  
    Dim fList() As String, curFile As String uu.Nq*3  
    GetFileList( cDir, fList ) 9 `&D  
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    Print "" oX ,M;;Yq  
    Print "Files found for merging:" q% 9oGYjvQ  
    For Each curFile In fList 3)\qt s5  
        Print Chr(9) & curFile L 3@wdC ~0  
    Next 3 2D/%dHC  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. }3lF;k(2g  
    Dim nameArray() As String, sampName As String .X1niguXH  
    nameArray = Split(fList(0)," 0-0.txt") 2fB@zF  
    sampName  = nameArray(0) 0in6 z  
    Print "" WpZ^R;eK  
    Print "Sample name: " & Chr(9) & sampName 9t1_"{'N1  
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    'Open an output file and write the FRED header data 9k&$bC+Q  
    Dim outFile As String ^XVa!s,d  
    outFile = cDir & sampName & "_FRED.txt" %C<eR_  
    Open outFile For Output As #1 b\Ub<pE  
    Print #1, "type bsdf_data" t+ ]+Gn  
    Print #1, "format angles=deg bsdf=value scale=1" 5Ncd1  
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    'Loop the file list, skip the two header lines and write the remaining data to file ^pa).B.`T  
    Dim lineArray() As String, curLine As Long my6T@0R  
    For Each curFile In fList ;@hP*7Lm  
        Print "Merging data from file " & curFile i,T{SV  
        ReadFile( cDir & curFile, lineArray ) Rw`s O:eZ  
        For curLine = 2 To UBound(lineArray) H l@rS  
            Print #1, lineArray(curLine) &tIm  
        Next nv]64mL3  
    Next bT}WJ2}  
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    'Close the output file 'P#I<?vB  
    Close #1 sx\7Z#|  
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    Print "Finished merging RPC data for sample " & sampName &IYkeGQr  
    Print "FRED formatted data file: " & Chr(9) & outFile l ,.;dw  
End Sub ."O(Ig[  
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'Utility function to read the contents of a file into an array of strings. f9$q.a*  
Function ReadFile(ByVal fileName As String, _ ):@B1 yR  
                  ByRef lineArray() As String) As Long H@:@zD!G[  
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    ReadFile = -1 ] W_T(C*  
    Dim oFSO As Object Pt+_0OsR  
    Set oFSO = CreateObject("Scripting.FileSystemObject") f WXzK<  
    Erase lineArray y6oDbwke  
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    Dim fid As Long {ex]_V>  
    If oFSO.fileexists( fileName ) Then t JP(eaqZ  
        fid = FreeFile() xT/&'$@{)  
        Open fileName For Input As fid 5`Bb0=j  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) #z.x3D@^r6  
        Close fid mq L+W  
    End If Fwr,e;Z  
    Set oFSO = Nothing ra1hdf0"  
    Return UBound( lineArray ) 5tL6R3  
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End Function "`k[ 4C  
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Sub GetFileList( ByVal in_dir As String, _ tj3p71%  
                 ByRef in_flist() As String ) y~fy0P:T  
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    'Redimension the file list array K5$ y  
    Erase in_flist z,tax`O  
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    'Tracks how many files are found ~>n<b1}W  
    Dim fCount As Long `xSXGI  
    fCount = 0 O_ c K 4  
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    'Recurse directory and search for text files R+\5hI@ >i  
    Dim f As String $f+9svq  
    f = Dir$(in_dir & "*.txt") QS_u<B  
    While f <> "" - M]C-$  
        ReDim Preserve in_flist(fCount) waC%o%fD  
        in_flist(fCount) = f Ud](hp"  
        fCount += 1 :MVD83?4  
        f = Dir$() 8Y9mB #X  
    Wend TsQMwV_h  
    ReDim Preserve in_flist(fCount-1) G4i&:0  
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End Sub S(Pal/-"  
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