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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 f'_M0x  
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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 c{4R*|^  
    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。 B6%&gXr\  
    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。 ]7vf#1i<  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 ?wCs&tM  
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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。 =<.F3lo\s  
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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) &O*ENpF  
    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 eEP( ).  
    例如下所示: l{Er+)a  
    Sample name:  EDF-C1-56 p:tN642  
    Merging data from file EDF-C1-56 0-0.txt ox4W$YdMG  
    Finished merging RPC data for sample EDF-C1-56 }NwN2xTB  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt Z Xb}R^O-  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 HsH <m j  
    a. 创建一个新的散射库 R@n5AN(  
    b. 散射模型命名 lwJipIO  
    c. 改变散射模型为“Tabulated BSDF”. ;"@:}_t  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) 2kJ!E@n7  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 (}"S) #C  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 4swKjN &  
    g. 点击OK W>$BF[x!{  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 sOQcx\dK  
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    脚本代码 H+`*Y<F@  
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    '#Language "WWB-COM" G"> 0]LQ  
    SUu >6'LN  
    Option Explicit *l-`<.  
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    Sub Main i~8DSshA  
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        'Cleanup 74]a/'4  
        ClearOutputWindow() N&x:K+Zm .  
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        Print "Merging RPC Photonics BSDF Data Files" ?K<Z kYw?  
        SetTextColor(255,0,0) BSDk9Oc  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." 5~[N/Gl  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." :H\&2/j  
        SetTextColor(0,0,0) qHJ'1~?q  
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        'Current directory of this script (should be the same as the text files being merged) [-58Ezyr  
        Dim cDir As String `:4MMr91  
        cDir = MacroDir$ & "\" +5-fk>o  
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        'Array which will be populated with the list of files to be merged 6(.H3bu  
        Dim fList() As String, curFile As String }{mG/(LX8  
        GetFileList( cDir, fList ) 7}o6_i  
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        Print "" !7c'<[+Hm  
        Print "Files found for merging:" {XHk6w *-  
        For Each curFile In fList N8 M'0i?  
            Print Chr(9) & curFile u<kD}  
        Next `M)E*G  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. H pFb{  
        Dim nameArray() As String, sampName As String Y%h}U<y  
        nameArray = Split(fList(0)," 0-0.txt") ]>vf9]  
        sampName  = nameArray(0) <`+zvUx^?  
        Print "" J[r^T&o  
        Print "Sample name: " & Chr(9) & sampName ?`aTu:1#Z  
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        'Open an output file and write the FRED header data T`Ro)ORC#  
        Dim outFile As String }9=2g`2Q  
        outFile = cDir & sampName & "_FRED.txt" _uJVuCc  
        Open outFile For Output As #1 4,zvFH*AH  
        Print #1, "type bsdf_data" ]738Z/)^  
        Print #1, "format angles=deg bsdf=value scale=1" 3SFg#  
    P\T|[%E'  
        'Loop the file list, skip the two header lines and write the remaining data to file x;mJvfX  
        Dim lineArray() As String, curLine As Long Y'JL(~|  
        For Each curFile In fList `*d{PJTv  
            Print "Merging data from file " & curFile RM#fX^)=  
            ReadFile( cDir & curFile, lineArray ) ]?# #))RUS  
            For curLine = 2 To UBound(lineArray) JT#7yetk'  
                Print #1, lineArray(curLine) J&_3VKrN  
            Next  mmcdtVe  
        Next h"8QeX:((  
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        'Close the output file bKByU{t  
        Close #1 K plM['uF  
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        Print "Finished merging RPC data for sample " & sampName |K)p]i+  
        Print "FRED formatted data file: " & Chr(9) & outFile u?Z <n:  
    End Sub FW5}oD( H  
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    'Utility function to read the contents of a file into an array of strings. \ =Nm5:  
    Function ReadFile(ByVal fileName As String, _ [,GU5,o  
                      ByRef lineArray() As String) As Long 6W:1>,xS  
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        ReadFile = -1 w49{-Pp[  
        Dim oFSO As Object qPUA!-'  
        Set oFSO = CreateObject("Scripting.FileSystemObject") kXMP=j8  
        Erase lineArray lZvS0JS  
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        Dim fid As Long (FG^UA#'  
        If oFSO.fileexists( fileName ) Then ]<q'U> N  
            fid = FreeFile() mZE8.`  
            Open fileName For Input As fid vS#{-X  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) '{CWanTPi  
            Close fid :~i+tD  
        End If M=6G:HHY  
        Set oFSO = Nothing fzyzuS$  
        Return UBound( lineArray ) ]\`w1'*  
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    End Function F0&O/-w&u  
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    Sub GetFileList( ByVal in_dir As String, _ 5v+L';wx[T  
                     ByRef in_flist() As String ) 6: GN(R$0  
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        'Redimension the file list array wcl!S{  
        Erase in_flist h&P {p _Y  
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        'Tracks how many files are found ivD^HhG  
        Dim fCount As Long EzUPah  
        fCount = 0 A-;^~I  
    U&s(1~e\  
        'Recurse directory and search for text files H<XlUCr_~+  
        Dim f As String 8lpzSJP4k  
        f = Dir$(in_dir & "*.txt") Z7oaQ\fR  
        While f <> "" &<@%{h@=  
            ReDim Preserve in_flist(fCount) ^^eV4Y5`+  
            in_flist(fCount) = f u X> PefR  
            fCount += 1 UC(9Dz  
            f = Dir$() , uO?;!t  
        Wend YMK>+y[+4  
        ReDim Preserve in_flist(fCount-1) 38"cbHE3  
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    End Sub {RH*8?7  
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    QQ:2987619807 4[Z1r~t\L  
     
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