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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 Vv zd>yII  
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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 @w2}WX>  
    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。 [t ^|l?  
    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。 u<+;]8[o  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 ~L?p/3m   
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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。 fF>H7  
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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) XLM 9+L  
    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 Ju:=-5r"'  
    例如下所示: u D . 0?*_  
    Sample name:  EDF-C1-56 Qy15TJ  
    Merging data from file EDF-C1-56 0-0.txt !N!M NsyDz  
    Finished merging RPC data for sample EDF-C1-56 mTcLocx  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt z.{y VQE  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 1AhL-Lj  
    a. 创建一个新的散射库 xv1$,|^ts  
    b. 散射模型命名 uV;Z  
    c. 改变散射模型为“Tabulated BSDF”. !rrjA$P<v  
    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 ) |QHWX^pO  
    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。 +LrW#K;  
    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 t7lRMCN  
    g. 点击OK 2b!b-  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 @89mj{  
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    脚本代码 slw^BK3t  
    #+r-$N.7  
    '#Language "WWB-COM" {9P<G]Z  
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    Option Explicit wu s]  
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    Sub Main qo'pU/@  
    =#1/<q)L  
        'Cleanup 64zO%F*  
        ClearOutputWindow() :@Q_oyWE8  
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        Print "Merging RPC Photonics BSDF Data Files" I |BLAm6j  
        SetTextColor(255,0,0) =. OW sFv  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." c L84}1QD  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." 'zRd?Z>%  
        SetTextColor(0,0,0) F2+lwycY  
    /@on=~  
        'Current directory of this script (should be the same as the text files being merged) mQ1QJ_;  
        Dim cDir As String # U!J2240  
        cDir = MacroDir$ & "\" C10A$=!  
    !a1jc_  
        'Array which will be populated with the list of files to be merged LG51e7_gFi  
        Dim fList() As String, curFile As String qE(`@G  
        GetFileList( cDir, fList ) <f:b%Pm 7  
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        Print "" x~KS;hA  
        Print "Files found for merging:" hu6)GOZbv  
        For Each curFile In fList G.c s-f  
            Print Chr(9) & curFile r?H {Y3 ,  
        Next b/E1v,/<  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. tjYe82  
        Dim nameArray() As String, sampName As String E6BW&Xp  
        nameArray = Split(fList(0)," 0-0.txt") o'R_kadN[T  
        sampName  = nameArray(0) ?jb7Oq#[  
        Print "" yUBic~S  
        Print "Sample name: " & Chr(9) & sampName @-Gf+*GZys  
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        'Open an output file and write the FRED header data QULrE+@  
        Dim outFile As String \#~~,k 6f  
        outFile = cDir & sampName & "_FRED.txt" d6~wJMFl  
        Open outFile For Output As #1 >YPfk=0f0  
        Print #1, "type bsdf_data" n j1 cqh  
        Print #1, "format angles=deg bsdf=value scale=1" .\< \J|3  
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        'Loop the file list, skip the two header lines and write the remaining data to file &XN*T.Y`  
        Dim lineArray() As String, curLine As Long JQI`9$asuC  
        For Each curFile In fList c9DX  
            Print "Merging data from file " & curFile [gD02a: u  
            ReadFile( cDir & curFile, lineArray ) 0(0Ep(Vj  
            For curLine = 2 To UBound(lineArray) =]"[?a >  
                Print #1, lineArray(curLine) "<bL-k*H)  
            Next DlTV1X-^1  
        Next `s@1'IG;R_  
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        'Close the output file SyTcp?H  
        Close #1 )]rGGNF*  
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        Print "Finished merging RPC data for sample " & sampName W~R_- ]k@g  
        Print "FRED formatted data file: " & Chr(9) & outFile >}_c<`:  
    End Sub Vs m06Rj{  
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    'Utility function to read the contents of a file into an array of strings. >>K) 4HYID  
    Function ReadFile(ByVal fileName As String, _ <@e6zQG  
                      ByRef lineArray() As String) As Long p5>TL!4M  
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        ReadFile = -1 hoeOdWI pf  
        Dim oFSO As Object /|BzpIfpN  
        Set oFSO = CreateObject("Scripting.FileSystemObject") )Z"7^ i  
        Erase lineArray O^|,Cbon6  
    [ *R8XXuL  
        Dim fid As Long `7+?1 z  
        If oFSO.fileexists( fileName ) Then H`B%6S /  
            fid = FreeFile() '$l*FWOEal  
            Open fileName For Input As fid h jW RU#  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) S\GG(#b!  
            Close fid %%kl R{  
        End If 7{/qQGL  
        Set oFSO = Nothing T3wR0,  
        Return UBound( lineArray ) )` '  
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    End Function fM \T^X  
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    Sub GetFileList( ByVal in_dir As String, _ Q y$8!(  
                     ByRef in_flist() As String ) }+I 8l'  
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        'Redimension the file list array ]Cbht\Ag"  
        Erase in_flist X[grV e  
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        'Tracks how many files are found /vSFQ}W  
        Dim fCount As Long K.*zqQKlI|  
        fCount = 0 Xgr|~(^  
    g oWD~'\  
        'Recurse directory and search for text files Ff%m.A8d,4  
        Dim f As String V ;"?='vVe  
        f = Dir$(in_dir & "*.txt") k $3.FO"  
        While f <> "" ) Q~Q .  
            ReDim Preserve in_flist(fCount) Z/:( *FC  
            in_flist(fCount) = f />.&  
            fCount += 1 tgc&DT; E  
            f = Dir$()  ,Ad\!  
        Wend (;C_>EL&u  
        ReDim Preserve in_flist(fCount-1) Z37Z  
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    End Sub z}OY'}sk8  
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