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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 +;T%7j"wz  
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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 7^1ikmYY  
    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。 B(~D*H2T[  
    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。 !**q20-aP  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 S $Wd}2>  
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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。 (/^&3xs9  
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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) V}("8L  
    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  /Wa+mp  
    例如下所示: tU(6%zvR  
    Sample name:  EDF-C1-56 wFe</U-';  
    Merging data from file EDF-C1-56 0-0.txt |laq y`D  
    Finished merging RPC data for sample EDF-C1-56 WrV|<%EQh  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt Rj8l]m6U9  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 0 [s1!Cm!i  
    a. 创建一个新的散射库 +1rJ;G  
    b. 散射模型命名 wZ\0<skU  
    c. 改变散射模型为“Tabulated BSDF”. E'C[+iK6,  
    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 ) (mzyA%;W  
    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。 4#o` -vcW  
    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 *]rV,\z:  
    g. 点击OK !"wIb.j }0  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 a P`;Nr=  
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    脚本代码 N.fIg  
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    '#Language "WWB-COM" ow&R~_  
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    Option Explicit cD 1p5U  
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    Sub Main ?HW*qD#k  
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        'Cleanup M|\ XFO  
        ClearOutputWindow() y==x  
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        Print "Merging RPC Photonics BSDF Data Files" )t|M)zJ  
        SetTextColor(255,0,0) Mqna0"IYx*  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." %rf<YZ.\  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." 7 `|- K  
        SetTextColor(0,0,0) a+Z/=YUR  
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        'Current directory of this script (should be the same as the text files being merged) <h^vl-L>  
        Dim cDir As String +UB. M  
        cDir = MacroDir$ & "\" 7,:QFV  
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        'Array which will be populated with the list of files to be merged VH8,!#Q;  
        Dim fList() As String, curFile As String f\ Qi()  
        GetFileList( cDir, fList ) Qml<JF  
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        Print "" (*#S%4(YX  
        Print "Files found for merging:" J"|o g|Tz  
        For Each curFile In fList V ] Z{0  
            Print Chr(9) & curFile &Y\`FY\   
        Next 0(]C$*~mk  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. Nkc=@l {  
        Dim nameArray() As String, sampName As String u-8,9  
        nameArray = Split(fList(0)," 0-0.txt") q>,i `*  
        sampName  = nameArray(0) UF?qL1w  
        Print "" ]@_*O$  
        Print "Sample name: " & Chr(9) & sampName xgfK0-T|[  
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        'Open an output file and write the FRED header data hivWQ$6%  
        Dim outFile As String -2f_e3jF  
        outFile = cDir & sampName & "_FRED.txt" {>90d(j  
        Open outFile For Output As #1 j2V^1  
        Print #1, "type bsdf_data" 3~Ah8,  
        Print #1, "format angles=deg bsdf=value scale=1" e~xN[Q\0]  
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        'Loop the file list, skip the two header lines and write the remaining data to file &S/KR$^ %  
        Dim lineArray() As String, curLine As Long h^cM#L^B  
        For Each curFile In fList {ymD.vf=9+  
            Print "Merging data from file " & curFile a:C ly9  
            ReadFile( cDir & curFile, lineArray ) :GK]"sNC  
            For curLine = 2 To UBound(lineArray) ih~ R?W  
                Print #1, lineArray(curLine) ttgb"Wb%S  
            Next 9[T}cN=|  
        Next NU O9,  
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        'Close the output file ).5$c0`U&  
        Close #1 R e-4y5f  
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        Print "Finished merging RPC data for sample " & sampName p4[cPt~C  
        Print "FRED formatted data file: " & Chr(9) & outFile U8 '}(  
    End Sub Y$ ZZ0m  
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    'Utility function to read the contents of a file into an array of strings. > <^ ,  
    Function ReadFile(ByVal fileName As String, _ uS;N&6;:  
                      ByRef lineArray() As String) As Long )k$ +T%  
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        ReadFile = -1 D&#wn.0|E  
        Dim oFSO As Object 0sIwU!=vm  
        Set oFSO = CreateObject("Scripting.FileSystemObject") h_n`E7&bG  
        Erase lineArray >We4F2?  
    '| WY 2>/(  
        Dim fid As Long Dg W*Br8<  
        If oFSO.fileexists( fileName ) Then $9bLD >.  
            fid = FreeFile() fgdqp8~  
            Open fileName For Input As fid GUSEbIz):  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) vq=nG]cE)  
            Close fid /6QwV->  
        End If GKIO@!@[  
        Set oFSO = Nothing m7!M stu  
        Return UBound( lineArray ) B)*?H=f/  
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    End Function MfNsor  
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    Sub GetFileList( ByVal in_dir As String, _ Xs}.7  
                     ByRef in_flist() As String ) )B)e cJJ_  
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        'Redimension the file list array ^ZP $(a4  
        Erase in_flist hh#p=Y(f  
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        'Tracks how many files are found cao=O \Y7  
        Dim fCount As Long UB^OMB-W.m  
        fCount = 0 %^Zu^uu   
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        'Recurse directory and search for text files /0CS2mLC  
        Dim f As String A*^aBWFR  
        f = Dir$(in_dir & "*.txt") jzvrJ14  
        While f <> "" XtCG.3(LY  
            ReDim Preserve in_flist(fCount) bY&!d.  
            in_flist(fCount) = f z>lIZ}  
            fCount += 1 :<gC7UW  
            f = Dir$() [] cF*en  
        Wend h(C@IIO^;G  
        ReDim Preserve in_flist(fCount-1) V$0mcwH  
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    End Sub 4Dy|YH$>S  
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