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    [分享]RPC Photonics扩散片BSDF [复制链接]

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    只看楼主 倒序阅读 楼主  发表于: 2020-12-15
    摘要 *'((_ NZ>  
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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 e)sR$]i:v  
    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。 53t_#Yte  
    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。 NQ{(G8x9  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 hYoUZ'4  
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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。 wnS,Jl  
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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) oC5 h-4~  
    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 HzTmNm)  
    例如下所示: N{%7OG  
    Sample name:  EDF-C1-56 wI@87&  
    Merging data from file EDF-C1-56 0-0.txt =|oi0  
    Finished merging RPC data for sample EDF-C1-56 C|ZPnm>f30  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt $a_y-lY  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 !!C/($  
    a. 创建一个新的散射库 nCYkUDnZ  
    b. 散射模型命名 y[m,t}gi  
    c. 改变散射模型为“Tabulated BSDF”. Qx)b4~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 ) 6H|1IrG  
    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。 'rB% a<  
    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 NY7yk3  
    g. 点击OK K1@ Pt}  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 GD4S/fn3  
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    脚本代码 t6"%u3W8M  
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    '#Language "WWB-COM" 7P1Pk?pxy  
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    Option Explicit 1_+ h"LE  
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    Sub Main O},}-%G  
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        'Cleanup v]k-x n|$j  
        ClearOutputWindow() r `PJb5^\|  
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        Print "Merging RPC Photonics BSDF Data Files" Z|t=t"6"  
        SetTextColor(255,0,0) \V-N~_-H  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." O,r;-t4vYU  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." R1zt6oY  
        SetTextColor(0,0,0) 4p"'ox#  
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        'Current directory of this script (should be the same as the text files being merged) +4 k=Y  
        Dim cDir As String .~i|kc]Ue  
        cDir = MacroDir$ & "\" |Y uf/G%/  
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        'Array which will be populated with the list of files to be merged JX&U?Z  
        Dim fList() As String, curFile As String 9L>?N:%5  
        GetFileList( cDir, fList ) WZ'Z"'  
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        Print "" ^`cv6;)  
        Print "Files found for merging:" +(*HDa|  
        For Each curFile In fList >+{WiZ`  
            Print Chr(9) & curFile IAO5li3  
        Next  W9?* ~!  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. AlQhKL}|s  
        Dim nameArray() As String, sampName As String %Y&48''"  
        nameArray = Split(fList(0)," 0-0.txt") <&\ng^Z$  
        sampName  = nameArray(0) TsFhrtnx&X  
        Print "" I# tlaz#  
        Print "Sample name: " & Chr(9) & sampName z|>TkCW6  
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        'Open an output file and write the FRED header data h`6 (Oo|  
        Dim outFile As String ZVXPp -M  
        outFile = cDir & sampName & "_FRED.txt" d27q,2f!  
        Open outFile For Output As #1 <H^jbK  
        Print #1, "type bsdf_data" |u>V> PN  
        Print #1, "format angles=deg bsdf=value scale=1" s,Gl{  
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        'Loop the file list, skip the two header lines and write the remaining data to file *q6XK_  
        Dim lineArray() As String, curLine As Long -m^- p  
        For Each curFile In fList <1*kXTN(  
            Print "Merging data from file " & curFile E^)FnXe5  
            ReadFile( cDir & curFile, lineArray ) mOJdx-q?r  
            For curLine = 2 To UBound(lineArray) CQ2vFg3+o  
                Print #1, lineArray(curLine) "AagTFs(i  
            Next 5|rBb[  
        Next 5len} ){  
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        'Close the output file Ll KO(Q{"  
        Close #1 ?;l@yx  
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        Print "Finished merging RPC data for sample " & sampName ]$g07 7o  
        Print "FRED formatted data file: " & Chr(9) & outFile t~L4wr{B  
    End Sub Sqa9+' [  
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    'Utility function to read the contents of a file into an array of strings. @g#5d|U);  
    Function ReadFile(ByVal fileName As String, _ ! yJ0A m>  
                      ByRef lineArray() As String) As Long 6_%Cd`4Z  
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        ReadFile = -1 2.Z#\6Vj  
        Dim oFSO As Object K9@.l~n  
        Set oFSO = CreateObject("Scripting.FileSystemObject") )5@P|{FF  
        Erase lineArray ovp/DM  
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        Dim fid As Long `dm*vd  
        If oFSO.fileexists( fileName ) Then X2V+cre  
            fid = FreeFile() O\Huj=  
            Open fileName For Input As fid 'u.Dt*.Uq  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) OP\jO DX  
            Close fid :|(YlNUv  
        End If ug,AvHEnB  
        Set oFSO = Nothing bo#xqSGQ  
        Return UBound( lineArray ) 0f5 ag&  
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    End Function vEfj3+e  
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    Sub GetFileList( ByVal in_dir As String, _ +2{ f>KZ  
                     ByRef in_flist() As String ) B=]j=\o  
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        'Redimension the file list array `i.fm1I]  
        Erase in_flist eZ:iW#YF  
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        'Tracks how many files are found a8TtItN  
        Dim fCount As Long = 9Yf o,F  
        fCount = 0 4 Y=0>FlY0  
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        'Recurse directory and search for text files , LwinjHA*  
        Dim f As String to: ;:Goa  
        f = Dir$(in_dir & "*.txt") 'TYO-'aC  
        While f <> "" D zD5n  
            ReDim Preserve in_flist(fCount) PV\J] |d,%  
            in_flist(fCount) = f "81'{\(I_  
            fCount += 1 #)}BY"C%  
            f = Dir$() !y$##PZ  
        Wend ~j[?3E4L}  
        ReDim Preserve in_flist(fCount-1) 6Mk#) ebM  
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    End Sub WzFXF{(  
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