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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 37/n"\4  
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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 o|(5Sr&H  
    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。 _95296  
    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。 }~XWtWbd-  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 jmM|on!  
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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。 '-;[8:y.  
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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) 9Eyx Ob  
    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 k"(]V  
    例如下所示: N4!`iS Y  
    Sample name:  EDF-C1-56 0mY Y:?v  
    Merging data from file EDF-C1-56 0-0.txt @c3xUK   
    Finished merging RPC data for sample EDF-C1-56 %z><)7  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt i q(PC3e`V  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 NK_|h %  
    a. 创建一个新的散射库 *U?O4E9  
    b. 散射模型命名 -Aj)<KNx[  
    c. 改变散射模型为“Tabulated BSDF”. du3f'=q6|  
    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 ) (jgk! 6  
    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。 Kx__&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 IHl q27O  
    g. 点击OK c3A\~tHW  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值  P#,u9EIJ  
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    脚本代码 yB*,)x0 @  
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    '#Language "WWB-COM" BM%wZ: s  
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    Option Explicit 157_0  
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    Sub Main n_8[bkbi  
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        'Cleanup kNEEu! G  
        ClearOutputWindow() b'H'QY   
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        Print "Merging RPC Photonics BSDF Data Files" C_.9qo]DT7  
        SetTextColor(255,0,0) 24mdhT|  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." ?9b9{c'an  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." 'Wonz<{'  
        SetTextColor(0,0,0) 2ej7Ql_@c  
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        'Current directory of this script (should be the same as the text files being merged) BT$p~XB  
        Dim cDir As String 5Wt){rG0Z  
        cDir = MacroDir$ & "\" f-=\qSo  
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        'Array which will be populated with the list of files to be merged iTVe8eI  
        Dim fList() As String, curFile As String \U~4b_aN  
        GetFileList( cDir, fList ) c8qr-x1HG  
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        Print "" j]a$RC#  
        Print "Files found for merging:" TOYK'|lwM  
        For Each curFile In fList ]Z JoC!u  
            Print Chr(9) & curFile P:qmg"i@3  
        Next  6 K $mW  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. wucdXj{%  
        Dim nameArray() As String, sampName As String bQAznd0  
        nameArray = Split(fList(0)," 0-0.txt") mYBEjZ B  
        sampName  = nameArray(0) 7p&jSOY  
        Print "" ;|N:F G  
        Print "Sample name: " & Chr(9) & sampName BxY t*b%  
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        'Open an output file and write the FRED header data [}X|&`'i  
        Dim outFile As String <_tmkLeZf  
        outFile = cDir & sampName & "_FRED.txt" cw;wv+|k  
        Open outFile For Output As #1 #m+!<  
        Print #1, "type bsdf_data" =bC +1 C  
        Print #1, "format angles=deg bsdf=value scale=1" 9N ]Xa  
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        'Loop the file list, skip the two header lines and write the remaining data to file .u`[|: K  
        Dim lineArray() As String, curLine As Long \ /-c)  
        For Each curFile In fList ?I.9?cQXZ  
            Print "Merging data from file " & curFile fGgt[f[  
            ReadFile( cDir & curFile, lineArray ) ^\)a[OWp  
            For curLine = 2 To UBound(lineArray) 5:Qz  
                Print #1, lineArray(curLine) ."K>h3(&V  
            Next X@nBj;   
        Next Vs>Pv$kW  
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        'Close the output file  idmU.`  
        Close #1 8 WP>u8&  
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        Print "Finished merging RPC data for sample " & sampName -H1=N  
        Print "FRED formatted data file: " & Chr(9) & outFile E3L?6Qfx>  
    End Sub ~PQ.l\C  
    ;rh.6Dl  
    'Utility function to read the contents of a file into an array of strings. ^s,3*cAU  
    Function ReadFile(ByVal fileName As String, _ lwnO  
                      ByRef lineArray() As String) As Long iP/v "g"g  
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        ReadFile = -1 !Jg;%%E3:i  
        Dim oFSO As Object )!y>2$20 r  
        Set oFSO = CreateObject("Scripting.FileSystemObject") ^({)t  
        Erase lineArray N gNGq\!  
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        Dim fid As Long >nSsbhAe  
        If oFSO.fileexists( fileName ) Then KaIKb=4L|  
            fid = FreeFile() LvG.ocCG  
            Open fileName For Input As fid  a+h$u  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) wNONh`b  
            Close fid }v1wpv/b(  
        End If ;!yK~OBxt  
        Set oFSO = Nothing bT,:eA  
        Return UBound( lineArray ) P -m_],  
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    End Function {+N< 9(O  
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    Sub GetFileList( ByVal in_dir As String, _ M 8^ID #  
                     ByRef in_flist() As String ) 3 qYGEhxv  
    `CK~x =  
        'Redimension the file list array ~W'DEpq_  
        Erase in_flist  %zavSm"  
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        'Tracks how many files are found s8j |>R|k  
        Dim fCount As Long `At.$3B  
        fCount = 0 n}p G&&;q  
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        'Recurse directory and search for text files 9t! d.}  
        Dim f As String j:9M${~  
        f = Dir$(in_dir & "*.txt") za l]t$z>  
        While f <> "" #h!+b  
            ReDim Preserve in_flist(fCount) , c.^"5  
            in_flist(fCount) = f {9IRW\kn  
            fCount += 1 kuY^o,u-1e  
            f = Dir$() whI{?NP  
        Wend ~Ps*i]n(  
        ReDim Preserve in_flist(fCount-1) B5\l&4X  
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    End Sub o<g?*"TRh  
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