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    [技术]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: 2023-05-11
    摘要 l}+Cdy9>  
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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 q@w"yz>  
    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。 cyHhy_~R  
    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。 >OTl2F}4 !  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 ktWZBQY  
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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。 mMslWe  
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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) Bjtj{B  
    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 8eN%sm  
    例如下所示: p^Agh  
    Sample name:  EDF-C1-56 xLZMpP5c  
    Merging data from file EDF-C1-56 0-0.txt {Bc#?n  
    Finished merging RPC data for sample EDF-C1-56 z=[l.Af_  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt %L28$c3p  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 dUZ$wbV%h  
    a. 创建一个新的散射库 p ^](3Vi(  
    b. 散射模型命名 @N]5&4NL  
    c. 改变散射模型为“Tabulated BSDF”. q< b"M$  
    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 ) !4_!J (q%  
    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。 *qbRP"#[$  
    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 M;V&KG Z  
    g. 点击OK QW,cn7  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 _J` |<}?t;  
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    脚本代码 ,R8n,az  
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    '#Language "WWB-COM" .:T9pplq  
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    Option Explicit Rnz8 f}  
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    Sub Main M&eQ=vew.  
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        'Cleanup EgFl="0  
        ClearOutputWindow() icU"Vyu  
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        Print "Merging RPC Photonics BSDF Data Files" ys/`{:w8p  
        SetTextColor(255,0,0) LPb]mC6#  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." ,!jR:nApE  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." JThk Wx  
        SetTextColor(0,0,0) D\n>*x  
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        'Current directory of this script (should be the same as the text files being merged) vY4WQbz(  
        Dim cDir As String 8 f|9W%jt  
        cDir = MacroDir$ & "\" %f_FGh  
    ]~$c~*0g  
        'Array which will be populated with the list of files to be merged md.*  
        Dim fList() As String, curFile As String ?`za-+<r<  
        GetFileList( cDir, fList ) sV]i/B  
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        Print "" 5%EaX?0h+  
        Print "Files found for merging:" [SKP|`I>I  
        For Each curFile In fList ^ b=5 6~[  
            Print Chr(9) & curFile [^h/(a`  
        Next MacL3f  
    f S(^["*G  
        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. muW`pm  
        Dim nameArray() As String, sampName As String e!TG< (S  
        nameArray = Split(fList(0)," 0-0.txt") { +i;e]c  
        sampName  = nameArray(0) @\#'oIc|  
        Print "" 0 =3FO}[u  
        Print "Sample name: " & Chr(9) & sampName UDhwnGTq(l  
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        'Open an output file and write the FRED header data S~]8K8"sT  
        Dim outFile As String /%2:+w  
        outFile = cDir & sampName & "_FRED.txt" ;4+qPWwq8W  
        Open outFile For Output As #1 se4w~\/  
        Print #1, "type bsdf_data" aa%Yk"V @  
        Print #1, "format angles=deg bsdf=value scale=1" dY/|/eOt<K  
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        'Loop the file list, skip the two header lines and write the remaining data to file J[I"/sdk-  
        Dim lineArray() As String, curLine As Long oVKsic?  
        For Each curFile In fList 3(oZZz  
            Print "Merging data from file " & curFile gEcnn .(S  
            ReadFile( cDir & curFile, lineArray ) ;mCGh~?G  
            For curLine = 2 To UBound(lineArray) 8A`p  
                Print #1, lineArray(curLine) okd  ``vG  
            Next g?k#wj1uH  
        Next 3C E 39W  
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        'Close the output file `kaR@t  
        Close #1 u* #-7   
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        Print "Finished merging RPC data for sample " & sampName H24ate?t,  
        Print "FRED formatted data file: " & Chr(9) & outFile *y":@T  
    End Sub Z&?+&q r^  
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    'Utility function to read the contents of a file into an array of strings. 7]<F>97  
    Function ReadFile(ByVal fileName As String, _ Z<$E.##  
                      ByRef lineArray() As String) As Long F$"MFdc[  
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        ReadFile = -1 Kt/+PS  
        Dim oFSO As Object h^.tom g8  
        Set oFSO = CreateObject("Scripting.FileSystemObject") ^Yg|P&e(;  
        Erase lineArray 8AC. 2 v?_  
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        Dim fid As Long ZC9.R$}Kl  
        If oFSO.fileexists( fileName ) Then FVvv   
            fid = FreeFile() q.u[g0h;  
            Open fileName For Input As fid RGx]DP$5G  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) O>tC]sm%  
            Close fid EL2hD$  
        End If KV) Hywl`  
        Set oFSO = Nothing O9Jx%tolF%  
        Return UBound( lineArray ) ]%WD} 4e  
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    End Function a V+o\fId  
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    Sub GetFileList( ByVal in_dir As String, _ B~ 'VDOG$Z  
                     ByRef in_flist() As String ) Jm*M7g j  
    ,&zjOc_v  
        'Redimension the file list array r=iMo7q  
        Erase in_flist O[5_ 9W 4  
    pJ)+}vascR  
        'Tracks how many files are found {YO%JTQ  
        Dim fCount As Long uZ=UBir  
        fCount = 0 jU3;jm.)  
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        'Recurse directory and search for text files 6|"!sW`%N  
        Dim f As String 9$\;voo  
        f = Dir$(in_dir & "*.txt") ac+k 5K+  
        While f <> "" I ]WeZ,E  
            ReDim Preserve in_flist(fCount) 7/U<\(V!g  
            in_flist(fCount) = f N8MlT \+r  
            fCount += 1 3Q!J9t5dc  
            f = Dir$() n'&`9M['%d  
        Wend +{=_|3(  
        ReDim Preserve in_flist(fCount-1) y}:)cA~o(y  
    ;([tf;  
    End Sub CL@h!h554_  
     
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